CN115057592A - Electrochemical phosphorus removal system and method for urban domestic wastewater - Google Patents
Electrochemical phosphorus removal system and method for urban domestic wastewater Download PDFInfo
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- CN115057592A CN115057592A CN202210923297.3A CN202210923297A CN115057592A CN 115057592 A CN115057592 A CN 115057592A CN 202210923297 A CN202210923297 A CN 202210923297A CN 115057592 A CN115057592 A CN 115057592A
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- phosphorus removal
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- dephosphorization
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 177
- 239000011574 phosphorus Substances 0.000 title claims abstract description 177
- 238000000034 method Methods 0.000 title claims abstract description 34
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- 238000011282 treatment Methods 0.000 claims abstract description 123
- 238000004062 sedimentation Methods 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 148
- 239000010802 sludge Substances 0.000 claims description 115
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- 238000012986 modification Methods 0.000 claims description 24
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
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- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
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- 238000007885 magnetic separation Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4614—Current
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses an electrochemical dephosphorization system and a dephosphorization method for urban domestic wastewater, which relate to the technical field of sewage treatment and comprise a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are sequentially connected; the pretreatment unit comprises a first pretreatment tank and a second pretreatment tank which are connected in sequence; the biochemical treatment unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence; the deep treatment unit comprises a denitrification deep bed filter; the device also comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank and the denitrification deep bed filter in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal tank, and an electrode plate is also arranged in the phosphorus removal tank. The system can realize systematic dephosphorization treatment of the domestic sewage, so that the domestic sewage can not only realize dephosphorization when needing treatment, but also realize early-stage deslagging and later-stage advanced treatment of the sewage after dephosphorization, thereby ensuring that the domestic sewage treatment is more systematic.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an electrochemical dephosphorization method and system for urban domestic wastewater.
Background
At present, domestic sewage in China is expanded from cities to vast rural areas, and non-point source pollution is increasingly serious. The urban domestic sewage is mainly discharged water generated by various kitchen water, washing water and toilet water used in human life, mainly contains nontoxic inorganic salts, a large amount of suspended solid, chemically or biologically degradable soluble or colloidal dispersed organic matters, nitrogen-containing compounds, phosphate, potassium, sodium, heavy metal ions, bacteria and biological groups and the like. In recent years, organic nitrogen and ammonia nitrogen in water consume dissolved oxygen in water, so that the water body is blackened and smelled; excessive nitrogen and phosphorus in the water body can cause eutrophication of the water body and worsen the water environment. In this regard, the national authorities have made increasingly strict controls on the nitrogen and phosphorus levels in wastewater. As the total nitrogen and the total phosphorus of the effluent of many sewage treatment plants exceed the national primary class A standard. Therefore, how to effectively reduce the concentration of phosphorus in the sewage has very important significance for eliminating pollution and protecting the environment.
At present, the municipal sewage treatment plant in China mostly adopts a chemical phosphorus removal method for total phosphorus, derives an enhanced coagulation technology, a super-magnetic separation technology and the like, and has the problems of large dosage, large sludge production, high sludge treatment cost, easy influence of water environment change on the phosphorus removal effect of chemical agents, toxicity of the chemical agents to aquatic organisms, secondary pollution of ecological systems and the like.
Therefore, a new system for advanced treatment of municipal wastewater is urgently needed to meet the discharge requirement of surface water.
Disclosure of Invention
The invention aims to provide an electrochemical dephosphorization system and an electrochemical dephosphorization method for urban domestic wastewater, so as to solve the problems.
In order to realize the purpose of the invention, the technical scheme is as follows: an electrochemical dephosphorization system for urban domestic wastewater comprises a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are connected in sequence;
the pretreatment unit comprises a first pretreatment tank and a second pretreatment tank which are connected in sequence;
the biochemical treatment unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence;
the deep treatment unit comprises a denitrification deep bed filter;
the device also comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank and the denitrification deep bed filter in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal groove and a water drainage groove, the phosphorus removal groove and the water drainage groove are of an integral structure or a split structure, and an electrode plate is further arranged in the phosphorus removal groove.
Furthermore, the first pretreatment tank is separated into a plurality of primary treatment areas through a partition board, and a sewage treatment coarse grid is arranged in the primary treatment area at the inlet end of the first pretreatment tank.
Furthermore, a secondary treatment area and an aeration sand setting area which are arranged at intervals are arranged in the second pretreatment tank, a sewage treatment fine grid and two gate plates are arranged in the secondary treatment area, the two gate plates are respectively positioned at the front side and the rear side of the sewage treatment fine grid, a water through hole for communicating the secondary treatment area with the aeration sand setting area is further formed in the second pretreatment tank, and a gate for opening or closing the water through hole is further arranged in the secondary treatment area; still be provided with first aeration subassembly in the aeration grit zone, and still be provided with the first air-blower to first aeration subassembly air feed on the second preliminary treatment pond.
Further, still be provided with the overflow region that separates with the aeration grit zone in the second preliminary treatment pond, still have the water hole of crossing that feeds through the aeration grit zone and overflow region on the second preliminary treatment pond, and still be provided with the baffle in the aeration grit zone, the baffle is close to the entrance point of overflow mouth, and the lower extreme of baffle is less than the height of overflow mouth.
Further, all be provided with the mixer in anaerobism pond, the oxygen deficiency pond, still have the pencil that adds on the anaerobism pond, still be provided with second aeration subassembly in the good oxygen pond, and be connected with mixed liquid return line between good oxygen pond and the anaerobism pond.
Furthermore, the electrochemical phosphorus removal unit further comprises a water drainage tank, the upper end of the phosphorus removal tank is communicated with the upper end of the water drainage tank, a support frame is further installed in the phosphorus removal tank, a plurality of electrode plates are arranged in the phosphorus removal tank, and the plurality of electrode plates are arranged on the support frame at intervals.
Furthermore, still be equipped with the inlet tube that is used for discharging the mud pipe of mud and is used for intaking on the dephosphorization groove, still be equipped with the outlet pipe on the drainage groove, and the outlet pipe is connected with good oxygen pond.
Furthermore, the water inlet pipe and the sludge discharge pipe are both positioned at the bottom of the dephosphorization tank, and the water inlet pipe is connected in parallel to the sludge discharge pipe.
Furthermore, the water outlet pipe is positioned in the middle of the water drainage tank, and a vent pipe is further arranged at the bottom of the water drainage tank.
Furthermore, electromagnetic valves are arranged on the sludge discharge pipe, the water inlet pipe, the water outlet pipe and the emptying pipe.
Furthermore, the number of the electrochemical phosphorus removal units is multiple, the multiple electrochemical phosphorus removal units are arranged in a rectangular array, and the multiple electrochemical phosphorus removal units are connected in parallel or connected in series in sequence.
Furthermore, the tank bottoms of the phosphorus removal tank and the water drainage tank are funnel-shaped, and the electrode plate is positioned in the middle of the phosphorus removal tank.
Furthermore, the plurality of electrode plates are arranged in an alternating manner of positive electrodes and negative electrodes.
Further, the electrode plate is a carbon steel plate or an iron plate or an aluminum plate.
Furthermore, the supporting frame is connected with the wall of the dephosphorization tank, and the electrode plate is connected with the supporting frame through clamping grooves.
Furthermore, the distance between two adjacent electrode plates is 1-12 cm.
Furthermore, the device also comprises an intermediate water tank, wherein the intermediate water tank is positioned between the secondary sedimentation tank and the phosphorus removal tank, and the outlet end of the intermediate water tank is provided with a parallel pipeline which is connected with the inlet end of the denitrification deep bed filter in parallel.
Furthermore, the sewage treatment device also comprises a sludge concentration tank and a sludge dewatering machine room which are sequentially connected, and a sludge return pipe is connected between the anaerobic tank, the secondary sedimentation tank and the sludge concentration tank.
Furthermore, a material tank, a sludge modification bin and a filter press which are connected in sequence are also installed in the sludge dewatering machine room, and the outlet end of the sludge concentration tank is connected with the inlet end of the sludge modification bin.
The invention also provides an electrochemical dephosphorization method of the urban domestic wastewater based on the system, which comprises the following steps:
removing dregs and suspended matters in the urban sewage by a pretreatment unit;
b, temporarily storing the pretreated sewage in an intermediate water tank after passing through an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank to remove ammonia nitrogen and degrade organic matters in the sewage;
c, the sewage treated in the step B enters an electrochemical phosphorus removal system for phosphorus removal, and the sewage after phosphorus removal enters an aerobic tank through a water outlet pipe 900 for nitrification so as to further remove ammonia nitrogen in the sewage;
d, treating the sewage with the phosphorus not exceeding the standard in the middle pool by the advanced treatment unit, and discharging the sewage after reaching the standard.
Further, in the invention, the current density is 40-60 mA/cm during electrochemical phosphorus removal 2 The electrolysis time is 15-30 minutes.
Further, the sewage pretreatment in the step A is to remove larger dregs from the sewage through a first pretreatment tank and then remove small-particle impurities through a second pretreatment tank.
Further, in the step B, the sewage passes through an anaerobic tank, so that macromolecular organic matters in the sewage are converted into micromolecular organic matters, a carbon source in the sewage is consumed, and the COD of the sewage is reduced;
further, sewage through anaerobic tank treatment enters into the oxygen deficiency pond and carries out preliminary sedimentation, and sewage after preliminary sedimentation enters into the aerobic tank, makes the micromolecule organic matter degradation, makes the ammonia nitrogen in the sewage nitrify, removes the ammonia nitrogen in the sewage to further reduce the COD of sewage.
Furthermore, the sewage in the aerobic tank flows back to the anoxic tank through the mixed liquid return pipeline, so that the untreated sewage flows back to the anoxic tank for circular treatment.
And further, the sewage from which ammonia nitrogen is removed in the anaerobic tank enters a secondary sedimentation tank for secondary sedimentation, and sediments generated in the sewage are removed by secondary sedimentation.
And further, in the step C, sewage enters the dephosphorization tank through the water inlet pipe, dephosphorization is carried out through the electrode plate, the sewage after dephosphorization flows into the drainage tank for precipitation, and then the sewage is discharged out of the drainage tank through the water outlet pipe.
Further, the sludge in the dephosphorization tank and the drainage tank is respectively converged to a sludge return pipe through a sludge discharge pipe and an emptying pipe and is sent to a sludge concentration tank.
And further, sending sewage with phosphorus not exceeding the standard in the intermediate water tank into a denitrification deep bed filter tank, adding a carbon source or a flocculating agent into the denitrification deep bed filter tank, further removing nitrate nitrogen through the denitrification deep bed filter tank, converting the nitrate nitrogen into nitrogen, finally sending the treated sewage into a fiber rotary disc filter tank to remove SS, and discharging the sewage after reaching the standard after being disinfected by an ultraviolet disinfection channel.
Further, the carbon source sodium acetate and the flocculating agent are PAC.
Furthermore, sediments in the anaerobic tank, the secondary sedimentation tank, the phosphorus removal tank and the drainage tank can be conveyed into the sludge concentration tank through a reflux pump on the sludge reflux pipe and then conveyed into the sludge modification bin.
Further, the modifier in the material tank is conveyed into the sludge modification bin, so that the sludge entering the sludge modification bin is fully reacted with the modifier, the sludge in the sludge modification bin is conveyed into a filter press after the sludge is reacted in the sludge modification bin, and is directly discharged after being subjected to filter pressing and dehydration through the filter press.
According to the technical scheme, electromagnetic valves are arranged on the water inlet pipe, the sludge discharge pipe, the water outlet pipe and the emptying pipe of the chemical phosphorus removal unit, and the PLC automatic control cabinet and the power distribution cabinet are used for controlling the opening and closing of the electromagnetic valves so that automatic control is achieved in the sewage phosphorus removal process, manual participation is not needed in the sewage phosphorus removal process, and the sewage phosphorus removal is simpler and more convenient.
The beneficial effect of the invention is that,
in the invention, phosphorus removal can be realized by adopting the electrode plates in the phosphorus removal tank, so that no medicament (physical medicament or chemical medicament) is required to be added in the phosphorus removal treatment process of sewage, the environment-friendly degree is high, the phosphorus removal can be thoroughly realized, and the sludge production is greatly reduced; meanwhile, the domestic sewage is subjected to systematic dephosphorization by matching with the pretreatment unit, the biochemical treatment unit and the advanced treatment unit, so that the domestic sewage can be subjected to dephosphorization by the system when needing to be treated, earlier-stage deslagging and later-stage advanced treatment on the dephosphorized sewage can be realized, the domestic sewage treatment is more systematic, and the treated sewage can be directly subjected to surface discharge.
The electromagnetic valve is arranged on the water inlet pipe of the plurality of electrochemical phosphorus removal units, so that the water inflow of each electrochemical phosphorus removal unit can be accurately controlled, multistage regulation and control of total phosphorus removal can be realized, the current density of the electrode plate can be regulated and controlled according to the water inflow, and the phosphorus removal is more efficient and thorough.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a system diagram of an electrochemical dephosphorization system for urban domestic wastewater provided by the invention;
FIG. 2 is a system diagram of a pre-processing unit;
FIG. 3 is a schematic diagram of a structure of an electrochemical phosphorus removal unit.
Reference numbers and corresponding part names in the drawings:
1. the system comprises a first pretreatment tank, a second pretreatment tank, a 3 anaerobic tank, a 4 anoxic tank, a 5 aerobic tank, a 6 secondary sedimentation tank, a 7 intermediate water tank, a 8 dephosphorization tank, a 9 drainage tank, a 10 denitrification deep bed filter tank, a 11 fiber rotary disc filter tank, a 12 ultraviolet disinfection channel, a 13 sludge concentration tank, a 14 material tank, a 15 sludge modification bin, a 16 filter press, a 17 mixed liquid return pipeline, a 18 sludge return pipe, a 19 return pump, a 20 lifting pump, a 21 medicine feeding pipe;
100. a primary treatment area 101, a sewage treatment coarse grid 102, a control valve group 103 and water through holes;
200. a secondary treatment area, 201, an aeration sand setting area, 202, a sewage treatment fine grid, 203, a gate plate, 204, a gate, 205, a first aeration component, 206, a first blower, 207, an overflow area, 208, an overflow port, 209 and a baffle plate;
300. a blender;
500. a second aeration assembly;
800. a water inlet pipe 801, a sludge discharge pipe 803, a support frame 804 and an electrode plate;
900. outlet pipe, 901, blow-down pipe, 902, PLC automatic control cabinet, 903, switch board.
Detailed Description
The present invention will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 and fig. 2, the electrochemical dephosphorization system for urban domestic wastewater provided by the invention comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit which are connected in sequence; the pretreatment unit is used for removing dregs in the domestic sewage and creating conditions for subsequent biochemical treatment; the biochemical treatment unit is used for performing biochemical treatment on the sewage, so that sediments (sludge) in the sewage can be conveniently removed, and the sewage is subjected to denitrification and deamination; the advanced treatment unit is used for further removing nitrogen from the sewage after dephosphorization, deamination and denitrification so as to ensure that the treated sewage can be directly discharged.
The pretreatment unit comprises a first pretreatment tank 1 and a second pretreatment tank 2 which are sequentially connected, a tap water pipe network for discharging urban domestic sewage is directly connected with the first pretreatment tank 1, so that the sewage to be treated is directly sent into the first pretreatment tank 1 through the tap water pipe network, and is pretreated in the first pretreatment tank 1 and then sent into the second pretreatment tank 2 for secondary pretreatment; the biochemical treatment unit comprises an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5 and a secondary sedimentation tank 6 which are connected in sequence, so that sewage subjected to secondary pretreatment is directly sent into the anaerobic tank 3, macromolecular refractory organic matters in the sewage can be converted into micromolecular organic matters easy to degrade by microorganisms, carbon sources in the sewage are consumed, COD of the sewage is reduced, the treated sewage enters the anoxic tank 4 for preliminary sedimentation, the sewage subjected to preliminary sedimentation enters the aerobic tank 5, the micromolecular organic matters easy to degrade by microorganisms are degraded, ammonia nitrogen in the sewage is nitrified, ammonia nitrogen in the sewage is removed, the COD of the sewage is further reduced, the sewage subjected to ammonia nitrogen removal continues to enter the secondary sedimentation tank for secondary sedimentation, and precipitates generated in the sewage are removed by secondary sedimentation; the advanced treatment unit comprises a denitrification deep bed filter 10 and a fiber rotary disc filter 11 which are connected in sequence, and sewage generated after secondary sedimentation enters the denitrification deep bed filter 10 to further remove nitrate nitrogen so that the nitrate nitrogen is converted into nitrogen.
The electrochemical phosphorus removal system for the urban domestic wastewater further comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected in parallel between the outlet end of the secondary sedimentation tank 6 and the inlet end of the denitrification deep bed filter 10, so that the urban domestic wastewater can be firstly sent into the electrochemical phosphorus removal unit for phosphorus removal and then sent into the denitrification deep bed filter 10 for nitrate nitrogen removal under the condition that the phosphorus content does not reach the standard, and the urban domestic wastewater can be directly sent into the denitrification deep bed filter 10 for nitrate nitrogen removal under the condition that the phosphorus content reaches the standard, so that the system can treat the urban domestic wastewater with lower phosphorus content and can treat the urban domestic wastewater with over-standard phosphorus content; specifically, the electrochemical phosphorus removal unit comprises a phosphorus removal tank 8, the inlet end of the phosphorus removal tank 8 is connected with the outlet end of the secondary sedimentation tank 6, the tank wall of the phosphorus removal tank 8 is made of 4-6mm engineering plastics, the thickness of the tank wall of the phosphorus removal tank 8 can be specifically adjusted according to actual conditions, an electrode plate 804 is further installed in the phosphorus removal tank 8, and when sewage enters the phosphorus removal tank 8, the electrode plate 804 can be in contact with the sewage. Taking the scale of the phosphorus removal tank 8 of 10m3/h as an example, the area size for installing the electrode plate 804 in the phosphorus removal tank 8 is a rectangle of 600 plus 1000mm, at this time, the thickness of the electrode plate 804 is 2-4mm, and the length of the electrode plate 804 is 400 plus 800mm, but when the electrode plate 804 is designed, the specific thickness and the specific size of the electrode plate 804 can be adjusted according to the size, the capacity, the nature of the sewage and the like of the phosphorus removal tank 8.
The urban domestic sewage conveyed by a tap water pipe network can be pretreated by a first pretreatment tank 1 and a second pretreatment tank 2 in a pretreatment unit so as to remove dregs, suspended matters and the like in the urban domestic sewage; the sewage after the pretreatment sequentially enters an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5 and a secondary sedimentation tank 6, the carbon source in the sewage is consumed while the macromolecular non-degradable organic matters in the sewage are converted into the micromolecular organic matters easy to be degraded by microorganisms, the ammonia nitrogen in the sewage is removed while the COD of the sewage is reduced, the micromolecular organic matters easy to be degraded by microorganisms in the sewage are degraded, and finally the sedimentation is carried out in the secondary sedimentation tank 6.
When the phosphorus content in the sewage is not over the standard, the precipitated sewage can directly enter the denitrification deep bed filter 10 to remove nitrate nitrogen. When the phosphorus content in the sewage exceeds the standard, the precipitated sewage enters the phosphorus removal tank 8, the electrode plate 804 is electrified, and the electrode plate 804 is used for removing phosphorus by taking the electrode plate 804 as an iron material as an exampleA redox system is formed in the phosphorus tank 8, and a large amount of Fe is generated at the anode 2+ 、Fe 3+ Ion and high molecular hydroxyl polymer Fe using the ion as core m (H 2 O)×(OH) n (3 m-n ) Compared with the flocculating agents such as common polymeric ferric sulfate and the like, the high molecular polymer has activity and specific surface area which are several times or even tens of times higher; when the iron-containing ionic liquid is fully mixed with the sewage, appropriate oxygenation and aeration are given to promote Fe in the sewage 2+ To Fe 3+ Changing and changing the pH value of the sewage; at the same time, PO in the phosphorus-containing wastewater 2 3- 、PO 3 3- 、P 2 O 7 4- The plasma will be oxidized to orthophosphate ion PO in the system 4 3- Above-mentioned Fe 2+ 、Fe 3+ With PO in water 4 3- React to generate indissolvable Fe 3 (PO 4 ) 2 And FePO 4 And the high-activity iron core high-molecular hydroxyl polymer in the system has strong adsorption, coagulation, capture and bridging capabilities, and rapidly and thoroughly captures and colloidal particles, so that the thorough phosphorus removal of the wastewater is realized.
In some embodiments, the first pretreatment tank 1 is divided into a plurality of primary treatment zones 100 by a partition plate, and the partition plate and the first pretreatment tank 1 are of an integral structure; when the first pretreatment tank 1 is a cement tank, the partition plate can be formed by adopting bricks; when the first pretreatment tank 1 is a metal tank, the partition plate may be formed by welding metal plates. The upper ends of the plurality of partition plates are provided with water through holes 103, so that the plurality of primary treatment areas 100 can be communicated together through the water through holes 103, the bottoms of the plurality of primary treatment areas 100 can be arranged in a ladder way, the bottom structures of the plurality of primary treatment areas 100 can be adjusted according to actual conditions, and the upper parts of the plurality of primary treatment areas 100 can be respectively covered by a plurality of fences or jointly covered by one fence; simultaneously, be provided with the thick grid 101 of sewage treatment in the primary treatment region 100 that is located the first-class treatment pond 1 entry end, the thick grid 101 of sewage treatment intercepts the sewage that enters into this primary treatment region 100, the thick grid 101 of sewage treatment is at the interception in-process, the thick grid 101 of sewage treatment of sewage permeable flows to the exit end of first pretreatment pond 1, and float great dregs in the sewage then the interception on the thick grid 101 of sewage treatment, and along with the thick grid 101 operation of sewage treatment with the dregs lift of interception see off first pretreatment pond 1, realize the preliminary treatment to sewage. A lifting pump 20 is arranged in the primary treatment area 100 at the outlet end of the first pretreatment tank 1, the outlet end of the lifting pump 20 is connected with the second pretreatment tank 2, so that the lifting pump 20 pumps the sewage pretreated by the sewage treatment coarse grid 101 in the first pretreatment tank 1 into the second pretreatment tank 2, and the sewage enters the second pretreatment tank 2 for secondary pretreatment; in order to control the pumping of the sewage in the first pretreatment tank 1 conveniently, a control valve group 102 can be further installed at the outlet end of the lift pump 20, and in order to facilitate the installation of the control valve group 102, a primary treatment area 100 for installing the control valve group 102 can be further reserved in the first pretreatment tank 1, so that the control valve group 102 does not need to occupy the ground space when being installed; the control valve set 102 is a check valve, which effectively prevents the sewage entering the second pretreatment tank 2 from flowing back.
In some embodiments, the second pretreatment tank 2 has a secondary treatment area 200 and an aerated sand settling area 201 which are arranged in a separated manner, the secondary treatment area 200 and the aerated sand settling area 201 can be separated by a partition plate, the partition plate can be arranged in the same manner as the partition plate in the first pretreatment tank 1, the upper end of the partition plate is also provided with a water through hole 103 for communicating the secondary treatment area 200 with the aerated sand settling area, and the secondary treatment area 200 is positioned at the water inlet end of the second pretreatment tank 2, so that the sewage after the first pretreatment in the first pretreatment tank 1 is directly introduced into the secondary treatment area 200 after being lifted by the lifting pump 20; meanwhile, the upper parts of the secondary treatment area 200 and the aeration sand setting area 201 can be respectively covered by two fences or jointly covered by one fence.
The secondary treatment area 200 is also internally provided with two flashboards 203, the sewage treatment fine grid 202 intercepts sewage entering the secondary treatment area 200, the sewage can flow into the air-setting sand area 201 of the sewage treatment fine grid 202 through the sewage treatment coarse grid 101 in the intercepting process of the sewage treatment fine grid 202, small particle impurities in the sewage are intercepted on the sewage treatment fine grid 202, and the intercepted small particle impurities are lifted out of the secondary treatment area 200 along with the operation of the sewage treatment fine grid 202, so that the secondary pretreatment of the sewage is realized; meanwhile, the two flashboards 203 are respectively positioned at the front side and the rear side of the sewage treatment fine grid 202, so that the sewage treatment fine grid 202 is positioned between the two flashboards 203, and the two flashboards 203 are matched, thereby effectively controlling the water inflow of the sewage entering the treatment fine grid and the water inflow of the sewage entering the aeration sand setting area 201, and because small particle impurities flow along with water easily, therefore, when the intercepted small particle impurities of the sewage treatment fine grid 202 are lifted and sent out of the secondary treatment area 200, the area can be intercepted by the matching of the two flashboards 203, the sewage treatment fine grid 202 is prevented from driving the small particle impurities to suspend in the sewage and directly enter the aeration sand setting area 201, and the influence on the treatment of the aeration sand setting area is avoided.
The secondary treatment area 200 is also internally provided with a gate 204 for opening or closing the water through hole 103, the connection or disconnection of the secondary treatment area 200 and the aeration sand settling area 201 is controlled through the gate 204, and the water inlet quantity entering the aeration sand settling area can also be controlled; a first aeration assembly 205 is further arranged in the aeration sand setting area 201, the outlet end of an aeration pipe in the first aeration assembly 205 is positioned at the bottom of the aeration sand setting area 201, and a first air blower 206 for supplying air to the first aeration assembly 205 is further arranged on the second pretreatment tank 2; specifically, the number of the first aeration assemblies 205 in the aerated grit region 201 can be multiple, and the multiple first aeration assemblies 205 are uniformly distributed in the aerated grit region 201, and then the air inlet ends of the multiple first aeration assemblies 205 can be connected in parallel to the outlet end of the first air blower 206; meanwhile, in order to install the plurality of first aeration assemblies 205, a fixing frame can be further installed in the aeration sand setting area 201, so that the upper ends of the plurality of first aeration assemblies 205 can be installed on the fixing frame, and the installation of the plurality of first aeration assemblies 205 is more stable. Through set up first aeration subassembly 205 in aeration sand setting area 201, make the accessible aeration of particulate matter entering into in the aeration sand setting area produce the friction, make the particulate matter among the sewage diminish to effectively prevent that sewage from causing the damage to elevator pump 20 etc. in subsequent transportation process.
In some embodiments, an overflow area 207 separated from the aerated grit region 201 is further disposed in the second pretreatment tank 2, the aerated grit region 201 and the overflow area 207 are separated in the same manner as the secondary treatment area 200 and the aerated grit region 201, and an overflow port 208 is disposed on a partition for separating the aerated grit region and the overflow area 207, and the overflow port 208 is located at the upper end of the partition; meanwhile, a baffle 209 is further arranged in the aeration grit region 201, the left end and the right end of the baffle 209 are fixed to the inner wall of the second pretreatment tank 2, the upper end of the baffle 209 can be flush with the upper surface of the second pretreatment tank 2, a certain distance is formed between the lower end of the baffle 209 and the bottom of the aeration grit region 201, sewage can flow through the distance, and particularly when the baffle 209 is designed, the lower end of the baffle 209 is lower than the overflow port 208, so that the sewage between the baffle 209 and the overflow port 208 can be relatively static in the aeration process of the first aeration assembly 205, small particles in the sewage can be precipitated at the bottom of the aeration grit region 201, and the precipitated sewage enters the overflow region 207 through the overflow port 208, so that the small particles in the sewage entering the overflow region 207 can be reduced or not exist as much as possible, and conditions are created for subsequent biochemical units. For convenience of control, the overflow area 207 can also be provided with a shutter plate 203, the shutter plate 203 is close to the overflow port 208, when the water level in the overflow area 207 is higher, in order to avoid that the sewage in the aeration sand settling area 201 directly enters the overflow area 207 due to too high water level, so that the sewage entering the biochemical unit cannot meet the treatment requirement of the biochemical unit, at the moment, the shutter plate 203 can intercept the overflow area 207, so that the requirement of the sewage entering the biochemical unit is ensured.
In some embodiments, the agitator 300 is disposed in each of the anaerobic tank 3 and the anoxic tank 4, the agitator 300 is a submersible agitator 300, and the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5 may be of an integrated structure, specifically, two partition plates are disposed in one large-sized tank, and partition the large-sized tank into the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5, of course, water through holes 103 are also formed in the two partition plates to ensure communication between the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5, the anaerobic tank 3 is communicated with an overflow region 207 in the second pretreatment tank 2, the aerobic tank 5 is communicated with the secondary sedimentation tank 6, and the agitator 300 is disposed in the anaerobic tank 3 and the anoxic tank 4, so that flora in the anaerobic tank 3 and the anoxic tank 4 are uniformly distributed by agitation of the agitator 300, and the nitrification efficiency of ammonia nitrogen in the aerobic tank 5 is higher; meanwhile, the anaerobic tank 3 is further provided with a dosing pipe 21, so that a regulator can be conveniently added into the anaerobic tank 3 in the sewage treatment process, specifically, the regulator is a carbon source such as sodium acetate, and the outlet end of the dosing pipe 21 can extend to the bottom of the anaerobic tank 3 and can also be directly positioned above the liquid level in the anaerobic tank 3. The aerobic tank 5 is also internally provided with a second aeration assembly 500, the structure of the second aeration assembly 500 is the same as that of the first aeration assembly 205, the outlet end of an aeration pipe in the second aeration assembly 500 is positioned at the bottom of the aerobic tank 5, and a second blower can be independently arranged for supplying air to the second aeration assembly 500; meanwhile, the number of the second aeration assemblies 500 can be multiple, and the multiple second aeration assemblies 500 are uniformly distributed in the aerobic tank 5, at this time, the air inlet ends of the multiple second aeration assemblies 500 can be connected in parallel at the outlet end of the second blower, of course, the arrangement of the second blower can be omitted here, at this time, the air inlet ends of the multiple second aeration assemblies 500 can be connected in parallel at the outlet end of the first blower 206, and under the condition that the first aeration assembly 205 and the second aeration assembly 500 are used, the equipment cost can be saved.
Be connected with mixed liquid return line 17 between aerobic tank 5 and the anaerobism pond 3, still install backwash pump 19 on the mixed liquid return line 17, and still can set up butterfly valve and check valve on the mixed liquid return line 17, make the sewage in the aerobic tank 5 can flow back to the oxygen deficiency pond 4 in through mixed liquid mixed flow line, make the thorough sewage of untreated and flow back to and carry out circulation treatment in the oxygen deficiency pond 4. In order to facilitate the sewage in the overflow area 207 to enter in an overflow mode when entering the anaerobic tank 3, an overflow weir can be arranged at the inlet of the anaerobic tank 3; similarly, in order to discharge the sewage treated in the aerobic tank 5 in an overflow manner, an overflow weir may be provided at the outlet of the aerobic tank 5.
In some embodiments, the electrochemical phosphorus removal unit further comprises a water drainage tank 9, and the phosphorus removal tank 8 and the water drainage tank 9 can be of an integral structure or a split structure. When the phosphorus removal tank 8 and the water drainage tank 9 are of an integral structure, a box body can be directly adopted, a partition plate is arranged in the box body to divide the interior of the box body into the phosphorus removal tank 8 and the water drainage tank 9 which are arranged left and right, at the moment, the height of the phosphorus removal tank 8 is equal to that of the water drainage tank 9, the bottom of the phosphorus removal tank 8 is flush with the bottom of the water drainage tank 9, the width of the phosphorus removal tank 8 is 200-400mm, and the upper end of the partition plate can be lower than the upper end of the shell or the upper end of the partition plate is provided with a water through hole 103, so that the upper end of the phosphorus removal tank 8 is communicated with the upper end of the water drainage tank 9; when the phosphorus removal tank 8 and the drainage tank 9 are of a split structure, the upper end of the phosphorus removal tank 8 and the upper end of the drainage tank 9 can be communicated with a water passing pipe or a water passing tank, and the treated water in the phosphorus removal tank 81 can overflow into the drainage tank 9 under the condition. In the present invention, the phosphorus removal tank 8 and the drainage tank 9 preferably adopt an integrated structure.
The dephosphorization tank 8 is internally provided with a support frame 803, a plurality of electrode plates 804 are arranged in the dephosphorization tank 8, a certain interval is arranged among the plurality of electrode plates 804, and the plurality of electrode plates 804 are jointly arranged on the support frame 803, so that the plurality of electrode plates 804 are jointly supported in the dephosphorization tank 8 through the support frame 803, and when sewage enters the dephosphorization tank 8, the plurality of electrode plates 804 can be in contact with the sewage.
In some embodiments, a sludge discharge pipe 801 and a water inlet pipe 800 are further arranged on the phosphorus removal tank 8, the sludge discharge pipe 801 is used for discharging colloidal particles and precipitated sludge generated after phosphorus removal in the phosphorus removal tank 8 out of the phosphorus removal tank 8, specifically, an outlet end of the secondary sedimentation tank is also connected in parallel with an intermediate water tank 7, the intermediate water tank 7 can be used for temporarily storing sewage to be subjected to phosphorus removal or sewage to be subjected to ammonium removal through the denitrification deep bed filter 10 through the intermediate water tank 7, the water inlet pipe 800 of the phosphorus removal tank 8 is connected in parallel with the outlet end of the intermediate water tank 7, and a lift pump 20 is further installed in the intermediate water tank 7, so that when the water level of the intermediate water tank 7 is low, the sewage can be lifted by the lift pump 20 to meet the use requirements of the phosphorus removal tank 8 and the denitrification deep bed filter 10, and the outlet end of the intermediate water tank 7 is simultaneously connected in parallel with an inlet end of the denitrification deep bed filter 10; meanwhile, the water discharging pipe 900 is further arranged on the water discharging groove 9, the water discharging pipe 900 is used for directly discharging water overflowing into the water discharging groove 9 after the dephosphorization treatment to the outside of the water discharging groove 9, and the water discharging pipe 900 is connected with the aerobic tank 5, so that the sewage after the dephosphorization can enter the aerobic tank 5 for nitration, and further ammonia nitrogen in the sewage is removed. Through the synergistic effect of the sludge discharge pipe 801, the water inlet pipe 800 and the water outlet pipe 900, the sewage entering, the sewage discharging after dephosphorization and the colloid particle discharging generated by dephosphorization do not need artificial participation, so that the dephosphorization of the sewage is more convenient.
In some embodiments, the height of the water outlet pipe 900 is equal to the height of the lower end of the electrode plate 804, so as to facilitate the drainage of the sewage in the drainage channel 9.
In some embodiments, the water inlet pipe 800 and the sludge discharge pipe 801 are both located at the bottom of the phosphorus removal tank 8, and the water inlet pipe 800 is connected in parallel to the sludge discharge pipe 801, so that the water inlet pipe 800 and the sludge discharge pipe 801 together form a three-way pipe, and a pipeline system on the phosphorus removal tank 8 is simpler; meanwhile, the water inlet pipe 800 is positioned at the bottom of the dephosphorization tank 8, so that the sewage can not directly contact the electrode plate 804 when entering the dephosphorization tank 8, and the sediment in the sewage can not be attached to the electrode plate 804 as much as possible, thereby ensuring the electrolysis effect.
In some embodiments, the bottom of the drainage tank 9 is further provided with an emptying pipe 901, so that the sewage overflowing into the drainage tank 9 can be further precipitated in the drainage tank 9, after precipitation, the upper layer sewage in the drainage tank 9 can be directly discharged through the water outlet pipe 900, and precipitates generated by precipitation can be directly discharged through the emptying pipe 901, so that the sewage after entering the dephosphorization treatment can be precipitated in the drainage tank 9.
In some embodiments, electromagnetic valves are disposed on the sludge discharge pipe 801, the water inlet pipe 800, the water outlet pipe 900 and the air release pipe 901, and in order to prevent sediment or colloidal particles generated in the phosphorus removal process during sludge discharge of the sludge discharge pipe 801 from entering the water inlet pipe 800, the electromagnetic valve on the water inlet pipe 800 is preferably installed at the outlet end of the water inlet pipe 800. Specifically, the invention can also be provided with a PLC automatic control cabinet 902 and a power distribution cabinet 903, wherein the power distribution cabinet 903 is used for respectively supplying power to the PLC automatic control cabinet 902, the electrode plate 804 and the electromagnetic valve, the PLC automatic control cabinet 902 not only controls the opening and closing of the electromagnetic valve on the sludge discharge pipe 801, the water inlet pipe 800, the water outlet pipe 900 and the emptying pipe 901, but also controls the electrification or the power failure of the electrode plate 804, so that the automatic control is realized in the sewage dephosphorization process, the manual participation is not needed in the sewage dephosphorization process, and the sewage dephosphorization is simpler and more convenient. Meanwhile, the electromagnetic valve is arranged on the water inlet pipe 800, so that the amount of sewage entering the dephosphorization tank 8 is effectively controlled, the voltage of the electrode plate 804 can be controlled according to the amount of sewage entering the dephosphorization tank 8 in the dephosphorization process, and efficient dephosphorization is realized.
In some embodiments, the number of the electrochemical phosphorus removal units is multiple, and the multiple electrochemical phosphorus removal units are arranged in a rectangular array, for example, the number of the electrochemical phosphorus removal units is 8, and the 8 electrochemical phosphorus removal units are arranged in a 2 × 4 manner. In order to reduce the floor area of the invention, when a plurality of electrochemical phosphorus removal units are arranged, no interval is arranged between two adjacent electrochemical phosphorus removal units; meanwhile, when the number of the electrochemical phosphorus removal units is multiple, the multiple electrochemical phosphorus removal units are connected in parallel or connected in series in sequence. When a plurality of phosphorus removal units are connected in parallel, the outlet ends of sludge discharge pipes 801 on the plurality of phosphorus removal units are connected in parallel, the inlet ends of water inlet pipes 800 on the plurality of electrochemical phosphorus removal units are connected in parallel, the outlet ends of water outlet pipes 900 on the plurality of electrochemical phosphorus removal units are connected in parallel, and the outlet ends of blow-down pipes 901 on the plurality of electrochemical phosphorus removal units are connected in parallel, so that the plurality of electrochemical phosphorus removal units can supplement sewage without phosphorus removal or discharge precipitate together or discharge sewage after phosphorus removal together, and the design makes the whole pipeline system simpler; when a plurality of phosphorus removal units are sequentially connected in series, the outlet end of a water outlet pipe 900 on the former phosphorus removal unit is connected with the inlet end of a water inlet pipe 800 on the latter phosphorus removal unit, the outlet ends of sludge discharge pipes 801 of the plurality of phosphorus removal units are connected in parallel, and the outlet ends of vent pipes 901 on the plurality of phosphorus removal units are connected in parallel.
In some embodiments, the bottoms of the phosphorus removal tank 8 and the drainage tank 9 are funnel-shaped, so that the precipitate generated in the phosphorus removal process and the precipitate generated in the drainage tank 9 after phosphorus removal can be automatically collected by gravity and then intensively discharged, and the precipitates in the phosphorus removal tank 8 and the drainage tank 9 are more thoroughly discharged; meanwhile, the electrode plate 804 is positioned in the middle of the phosphorus removal tank 8, and the precipitate generated in the phosphorus removal process of the sewage can fall to the bottom of the phosphorus removal tank 8 through self weight, so that the precipitate generated in the phosphorus removal process is always separated from the electrode plate 804, the influence of the precipitate generated in the phosphorus removal process on the amount of the electric ions generated by the electrode plate 804 is avoided, and the phosphorus removal effect is effectively ensured.
In some embodiments, the plurality of electrode plates 804 are alternately arranged in the form of positive electrodes and negative electrodes, and in order to prevent the electrode plates 804 from hardening and passivating, the electrode plates 804 may further be powered by a pulse power supply, and the positive electrodes and the negative electrodes of the electrode plates 804 may be switched according to a set frequency, so that the electrode plates 804 can generate sufficient ions when being charged, and the amount of the ions generated by the electrode plates 804 is ensured.
In some embodiments, the electrode plate 804 is a carbon steel plate, an iron plate, or an aluminum plate, and the specific material of the electrode plate 804 can be adjusted according to actual requirements.
In some embodiments, the supporting frame 803 and the wall of the phosphorus removal tank 8, and the electrode plate 804 and the supporting frame 803 are all connected by a clamping groove, specifically, the groove structures can be prefabricated in the production and processing processes of the phosphorus removal tank 8 and the supporting frame 803, so that the subsequent independent installation of the groove structures on the walls of the supporting frame 803 and the phosphorus removal tank 8 is not required, the supporting frame 803 can be clamped by the clamping groove on the wall of the phosphorus removal tank 8 during installation, and the electrode plate 804 can be clamped by the clamping groove on the supporting frame 803 during installation, so that the installation and the disassembly of the electrode plate 804 are more convenient.
In some embodiments, the distance between two adjacent electrode plates 804 is 1-12cm, and the specific size of the distance between two adjacent electrode plates 804 can be adjusted by calculation according to the thickness of the electrode plates 804, the concentration of the wastewater, the flow rate of the wastewater, and the like.
In some embodiments, the steel ladder and the steel guardrail can be arranged on the same side of the plurality of electrochemical phosphorus removal units, so that workers can conveniently patrol and overhaul at any time in the sewage phosphorus removal treatment process.
In some embodiments, the electrochemical phosphorus removal system for municipal wastewater provided by the invention further comprises a sludge concentration tank 13 and a sludge dewatering machine room which are sequentially connected, specifically, the anoxic tank 4, the secondary sedimentation tank 6, and the emptying pipe 901 and the sludge discharge pipe 801 in the electrochemical phosphorus removal unit are all connected with the sludge concentration tank 13, and the connection between the anoxic tank 4, the secondary sedimentation tank 6, the emptying pipe 901 and the sludge discharge pipe 801 in the electrochemical phosphorus removal unit and the sludge concentration tank 13 can be realized by adopting the connection of a sludge return pipe 18, so that precipitates, sludge and the like generated in the system can be sent into the sludge concentration tank 13 for concentrated concentration treatment, and are directly sent into the sludge dewatering machine room for dewatering treatment after concentration treatment, and finally sludge after dewatering treatment is obtained. In order to ensure the sludge discharge effect in the anoxic tank 4, the secondary sedimentation tank 6 and the electrochemical phosphorus removal unit, a reflux pump 19 can be also arranged on the sludge reflux pipe 18, so that the equipment cost is saved, the sludge reflux pipes 18 for conveying the anoxic tank 4, the secondary sedimentation tank 6, the blow-down pipe 901 and the sludge discharge pipe 801 in the electrochemical phosphorus removal unit can be connected in parallel and then connected with the sludge concentration tank 13, at the moment, an electromagnetic valve can be arranged on each sludge reflux pipe 18, and the reflux pump 19 is arranged at the inlet end of the sludge concentration tank 13.
In some embodiments, a material tank 14, a sludge modification bin 15 and a filter press 16 are further installed in the sludge dewatering machine room, the material tank 14 is used for storing a modifier, the modifier in the material tank 14 can be added into the sludge modification bin 15 as required, so that the sludge fed into the sludge modification bin 15 through the sludge concentration tank 13 is modified after reacting with the modifier, and is fed into the filter press 16 for filter pressing treatment after modifying the sludge, so that the dewatered sludge is obtained, and the sludge dewatered by filter pressing through the filter press 16 can be transported away by loading a truck through an elevator.
In some embodiments, the electrochemical dephosphorization system for urban domestic wastewater provided by the invention further comprises a fiber rotary disc filter 11 and an ultraviolet disinfection canal, the limit rotary disc filter and the ultraviolet disinfection canal 12 are sequentially connected with the water outlet end of the denitrification deep-bed filter 10, the denitrification deep-bed filter 10 is further provided with a chemical feeding pipe 21 for supplementing a carbon source (sodium acetate) and a chemical feeding pipe 21 for supplementing a PAC flocculant, an aeration assembly can be further arranged in the denitrification deep-bed filter 10, and a blower for supplying air to the aeration assembly can be independently arranged or the inlet end of the aeration assembly can be directly connected in parallel with the first blower 206 or the second blower. By arranging the fiber rotary disc filter 11 and the ultraviolet disinfection channel, the sewage after further denitrification by the denitrification deep bed filter 10 is subjected to SS removal by the fiber rotary disc filter 11 and then is subjected to ultraviolet disinfection by the ultraviolet disinfection channel and then is discharged up to the standard, so that the sewage treated by the phosphorus removal system provided by the invention can be directly discharged. It is noted that the fiber rotary disc filter 11 can be replaced by artificial wetland.
When the method is used for urban domestic sewage treatment, the specific treatment steps are as follows:
a pretreatment unit: the urban domestic sewage is firstly sent into a first pretreatment tank 1 through a tap water pipe network, the urban domestic sewage is intercepted by a sewage treatment coarse grid 101 after entering the first pretreatment tank 1, large dregs floating in the sewage are intercepted by the sewage treatment coarse grid 101, the sewage normally flows, the dregs intercepted on the sewage treatment coarse grid 101 are lifted by the sewage treatment coarse grid 101 and directly discharged out of the first pretreatment tank 1, the sewage in the first pretreatment tank 1 is finally sent into a secondary treatment area 200 through a lifting pump 20 along with the flowing of the sewage in the first pretreatment tank 1, the sewage entering into the secondary treatment area 200 passes through a sewage treatment fine grid 202 along with the flowing, small granular impurities in the sewage are intercepted on the sewage treatment fine grid 202 in the flowing process, and the small granular impurities intercepted on the sewage treatment fine grid 202 are lifted by the sewage treatment fine grid 202 and directly discharged out of the secondary treatment area 200, the gate 204 at the water through hole 103 is opened, and along with the normal flow of the sewage, the sewage enters the aeration sand setting area 201, the first air blower 206 is started, the first aeration assembly 205 starts aeration, so that the sewage boils in the aeration sand setting area 201, the residual particles in the sewage are reduced along with the friction generated by the boiling of the sewage, the fine particles precipitated in the aeration process are directly discharged and sent into the sand-water separator for separation and then discharged, the aerated sewage overflows through the overflow port 208 and enters the overflow area 207, and the sewage entering the overflow area 207 is sent into the anaerobic tank 3.
A biochemical treatment unit: the sewage sent out through the overflow area 207 enters the anaerobic tank 3 and enters in an overflow mode through an overflow weir when entering the anaerobic tank 3, the sewage enters the anaerobic tank 3 and is added with carbon sources such as sodium acetate and the like, a stirrer 300 in the anaerobic tank 3 simultaneously stirs the water, the sodium acetate dissolves and converts the molecular refractory organics in the sewage into micromolecular organics which are easy to be degraded by microorganisms, the carbon source in the sewage is consumed at the same time, the COD of the sewage is reduced, the sewage which uniformly dissolves the sodium acetate automatically flows into the anoxic tank 4, the stirrer 300 in the anoxic tank 4 stirs the water, during the stirring process, floras in the sewage are uniformly distributed in the anoxic tank 4 and remove ammonia nitrogen and degraded organics in the sewage, then, supernatant in the anoxic tank 4 automatically flows into the aerobic tank 5, the second air blower runs at the moment, and provides an air source for the second aeration component 500, the sewage entering the aerobic tank 5 is boiled, organic matters in the sewage are degraded, the nitrification of ammonia nitrogen is realized, finally, the sewage in the aerobic tank 5 automatically flows into a secondary sedimentation tank, the sewage is precipitated in a secondary sedimentation tank 6, the sewage after secondary sedimentation is sent into an intermediate water tank 7, when the phosphorus content of the precipitated sewage exceeds the standard, the precipitated sewage directly enters a phosphorus removal tank 8 through a water inlet pipe 800, and if the phosphorus content of the precipitated sewage does not exceed the standard, the precipitated sewage is directly sent into a denitrification deep-bed filter 10.
In the treatment unit, when the degradation of organic matters in the sewage through aeration in the aerobic tank 5 is not thorough enough, the sewage in the aerobic tank 5 can be directly sent into the anoxic tank 4 through the mixed liquid return pipeline 17 to be repeatedly operated, and the sewage in the aerobic tank 5 can be pumped through the return pump 19 on the mixed liquid mixed flow pipeline when being sent through the mixed liquid return pipeline 17.
An electrochemical phosphorus removal unit: when the phosphorus content of the sewage after secondary precipitation exceeds the standard and the sewage needs to enter the phosphorus removal tank 8 through the water inlet pipe 800, the electromagnetic valves on the water inlet pipe 800 and the water outlet pipe 900 are opened, the sewage to be subjected to phosphorus removal enters the inlet end of the sludge discharge pipe 801 through the water inlet pipe 800 and finally enters the phosphorus removal tank 8, the electrode plate 804 is electrified, and a large amount of Fe is generated by the anode of the electrode plate 804 2+ 、Fe 3+ Ion and high molecular hydroxyl polymer Fe using the ion as core m (H 2 O)×(OH) n (3 m-n ) Compared with the flocculating agents such as common polymeric ferric sulfate and the like, the high molecular polymer has activity and specific surface area which are several times or even tens of times higher. When the iron-containing ionic liquid is fully mixed with the sewage, appropriate oxygenation and aeration are given to promote Fe in the sewage 2+ To Fe 3+ And changing the pH value of the sewage. At the same time, PO in the phosphorus-containing wastewater 2 3- 、PO 3 3- 、P 2 O 7 4- The plasma will be oxidized to orthophosphate ion PO in the system 4 3- Above-mentioned Fe 2+ 、Fe 3+ With PO in water 4 3- The reaction generates insoluble and high-activity iron core high molecular hydroxyl polymer in the system, has strong adsorption, coagulation, capture and bridging capabilities, rapidly and thoroughly captures and colloidal particles, and the iron core high molecular hydroxyl polymer and the colloidal particles are deposited at the bottom of the phosphorus removal tank 81 through self weight.
In the dephosphorization process in the dephosphorization tank 8, the water inlet pipe 800 continuously replenishes sewage in the dephosphorization tank 8, so that the water level in the dephosphorization tank 8 gradually rises, when the water level in the dephosphorization tank 8 reaches the water through holes 103, the sewage after dephosphorization in the dephosphorization tank 8 overflows into the drainage tank 9 through the water through holes 103, the sewage entering into the drainage tank 9 automatically precipitates, the precipitated precipitate is accumulated at the bottom of the drainage tank 9, and along with the rise of the water level in the drainage tank 9, the sewage after precipitation in the drainage tank 9 overflows through the water outlet pipe 900 and is discharged into the aerobic tank 5, and the steps in the biochemical treatment unit are repeated.
When the sediment in the drainage tank 9 and the dephosphorization tank 8 is deposited more, the electromagnetic valve on the water outlet pipe 900 is closed, the electrode plate 804 is powered off, the electromagnetic valves on the sludge discharge pipe 801 and the emptying pipe 901 are opened, the sediment in the drainage tank 9 is discharged through the emptying pipe 901, and the sediment in the dephosphorization tank 8 is discharged through the sludge discharge pipe 801.
A depth processing unit: when the phosphorus content of the sewage does not exceed the standard, the sewage in the intermediate water tank 7 is directly sent into the denitrification deep bed filter 10, a carbon source (sodium acetate) is added into the denitrification deep bed filter 10, a PAC flocculating agent can be added if necessary, nitrate nitrogen is further removed through the denitrification deep bed filter 10 and converted into nitrogen, and the finally treated sewage enters the fiber rotary disc filter 11 to remove SS and is disinfected through an ultraviolet disinfection channel and then is discharged after reaching the standard.
A depth processing unit: the sediments in the anaerobic tank 3, the secondary sedimentation tank 6, the dephosphorization tank 8 and the drainage tank 9 can be all sent into the sludge concentration tank 13 through a reflux pump 19 on a sludge reflux pipe 18, specifically, electromagnetic valves on a sludge discharge pipe 801 and an emptying pipe 901 are opened, so that the sediments in the dephosphorization tank 8 and the sediments in the drainage tank 9 can be all sent into the sludge concentration tank 13 through the sludge reflux pipe 18, the sediments in the anaerobic tank 3, the secondary sedimentation tank 6, the dephosphorization tank 8 and the drainage tank 9 are sent into the sludge modification bin 15 after entering the sludge concentration tank 13, meanwhile, the modifier in the material tank 14 is conveyed into the sludge modification bin 15, so that the sludge entering the sludge modification bin 15 is fully reacted with the modifier, after the sludge is reacted in the sludge modification bin 15, the sludge in the sludge modification bin 15 is sent into a filter press 16, and is directly discharged after being subjected to filter pressing and dehydration by the filter press 16.
In the present invention, when calculating the amount of generated ions in the electrode plate 804, the current density is J, which is a physical quantity describing the intensity and flow direction of the current at a certain point in the circuit, and the magnitude of the physical quantity is equal to the amount of electricity passing through a certain unit area in a unit time, generally expressed as A/m 2 And (4) showing. The area of the electrode plate 804 is a constant value S, the current is I, the energization time T, the electric quantity is Q, the number of electrons n, the single electron electric quantity Q, the resistance of the electrode plate 8049 is R, and k is a constant.
When the area and resistance of the electrode plate 804 are fixed and the electric quantity of a single electron is fixed, the current density can be changed by changing the voltage under the condition of a fixed energization time, and thus the current density is changed, and the current density is in a proportional relationship with the generation quantity of electrons.
Meanwhile, the invention can also control the generation amount of Fe ions, the generation amount of ions and PO through controlling the current density by the power supply 4 3- The reaction takes place to remove phosphorus, so that the total phosphorus concentration can be passedThe current density is adjusted by the change of the total phosphorus removal device, and the total phosphorus is accurately removed.
Example 1
Taking general urban domestic sewage as an example, A 2 The total phosphorus of the effluent of the O process can reach the first-grade A standard of pollutant emission Standard of urban Sewage treatment plant (GB 18918-.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples and features of the various embodiments/modes or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. Other variations or modifications will occur to those skilled in the art based on the foregoing disclosure and are within the scope of the invention.
Claims (10)
1. An electrochemical dephosphorization system for urban domestic wastewater is characterized by comprising a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are sequentially connected;
the pretreatment unit comprises a first pretreatment tank (1) and a second pretreatment tank (2) which are connected in sequence;
the biochemical treatment unit comprises an anaerobic tank (3), an anoxic tank (4), an aerobic tank (5) and a secondary sedimentation tank (6) which are connected in sequence;
the deep treatment unit comprises a denitrification deep bed filter (10);
the device is characterized by further comprising an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank (6) and the denitrification deep-bed filter (10) in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal groove (8) and a water drainage groove (9), the phosphorus removal groove (8) and the water drainage groove (9) are of an integrated structure or a split structure, and an electrode plate (804) is further installed in the phosphorus removal groove (8).
2. The electrochemical dephosphorization system for urban domestic wastewater according to claim 1, wherein the first pretreatment tank (1) is divided into a plurality of primary treatment areas (100) by partition plates, and a sewage treatment coarse grid (101) is arranged in the primary treatment area (100) at the inlet end of the first pretreatment tank (1).
3. The urban domestic wastewater electrochemical dephosphorization system according to claim 1, wherein the second pretreatment tank (2) is provided with a secondary treatment area (200) and an aeration grit region (201) which are arranged at intervals, a sewage treatment fine grid (202) and two shutters (203) are arranged in the secondary treatment area (200), the two shutters (203) are respectively positioned at the front side and the rear side of the sewage treatment fine grid (202), the second pretreatment tank (2) is also provided with water through holes (103) for communicating the secondary treatment area (200) and the aeration grit region (201), and the secondary treatment area (200) is also provided with a shutter (204) for opening or closing the water through holes (103); a first aeration assembly (205) is further arranged in the aeration sand setting area (201), and a first air blower (206) for supplying air to the first aeration assembly (205) is further arranged on the second pretreatment tank (2); preferably, an overflow area (207) separated from the aeration sand setting area (201) is further arranged in the second pretreatment tank (2), the second pretreatment tank (2) is further provided with a baffle (209) communicated with the aeration sand setting area (201) and the overflow area (207), the aeration sand setting area (201) is further internally provided with a baffle (209), the baffle (209) is close to the inlet end of the overflow port (208), and the lower end of the baffle (209) is lower than the height of the overflow port (208).
4. The electrochemical urban domestic wastewater dephosphorization system according to claim 1, wherein a stirrer (300) is arranged in each of the anaerobic tank (3) and the anoxic tank (4), the anaerobic tank (3) is further provided with a dosing pipe (21), the aerobic tank (5) is further provided with a second aeration assembly (500), a mixed liquor return pipe (17) is connected between the aerobic tank (5) and the anaerobic tank (3), and a sludge return pipe (22) is connected between the secondary sedimentation tank (2) and the anaerobic tank (3).
5. The urban domestic wastewater electrochemical phosphorus removal system of claim 1, wherein the number of the electrochemical phosphorus removal units is multiple, the multiple electrochemical phosphorus removal units are arranged in a rectangular array, and the multiple electrochemical phosphorus removal units are connected in parallel or in series in sequence; preferably, the electrochemical phosphorus removal unit further comprises a water drainage tank (9), the upper end of the phosphorus removal tank (8) is communicated with the upper end of the water drainage tank (9), a support frame (803) is further installed in the phosphorus removal tank (8), a plurality of electrode plates (804) are arranged in the phosphorus removal tank (8), and the plurality of electrode plates (804) are arranged on the support frame (803) at intervals; preferably, a sludge discharge pipe (801) for discharging sludge and a water inlet pipe (800) for feeding water are further arranged on the phosphorus removal tank (8), a water outlet pipe (900) is further arranged on the water discharge tank (9), and the water outlet pipe (900) is connected with the aerobic tank (5); preferably, the water inlet pipe (800) and the sludge discharge pipe (801) are both positioned at the bottom of the dephosphorization tank (8), and the water inlet pipe (800) is connected in parallel to the sludge discharge pipe (801); preferably, the water outlet pipe (900) is positioned in the middle of the drainage tank (9), and a vent pipe (901) is further arranged at the bottom of the drainage tank (9); preferably, the sludge discharge pipe (801), the water inlet pipe (800), the water outlet pipe (900) and the emptying pipe (901) are all provided with electromagnetic valves; preferably, the bottoms of the phosphorus removal tank (8) and the drainage tank (9) are funnel-shaped, and the electrode plate (804) is positioned in the middle of the phosphorus removal tank (8); preferably, the electrode plates (804) are arranged alternately in a positive electrode and a negative electrode; preferably, the electrode plate (804) is a carbon steel plate or an iron plate or an aluminum plate; preferably, the distance between two adjacent electrode plates (804) is 1-12 cm; preferably, the supporting frame (803) is connected with the wall of the dephosphorization tank (8), and the electrode plate (804) is connected with the supporting frame (803) through clamping grooves.
6. The electrochemical urban domestic wastewater dephosphorization system according to claim 5, further comprising an intermediate water tank (7), wherein the intermediate water tank (7) is positioned between the secondary sedimentation tank (6) and the dephosphorization tank (8), and the outlet end of the intermediate water tank (7) is provided with a parallel pipeline connected in parallel with the inlet end of the denitrification deep-bed filter (10).
7. The electrochemical dephosphorization system for urban domestic wastewater according to any one of claims 1 to 6, further comprising a sludge concentration tank (13) and a sludge dewatering machine room which are connected in sequence, wherein a sludge return pipe (18) is connected between the anaerobic tank (3), the secondary sedimentation tank (6) and the sludge concentration tank (13); preferably, a material tank (14), a sludge modification bin (15) and a filter press (16) which are connected in sequence are further installed in the sludge dewatering machine room, and the outlet end of the sludge concentration tank (13) is connected with the inlet end of the sludge modification bin (15).
8. An electrochemical dephosphorization method for urban domestic wastewater based on the system of any one of claims 1 to 7, which is characterized by comprising the following steps:
removing dregs and suspended matters in the urban sewage by a pretreatment unit;
b, the sewage after the pretreatment passes through an anaerobic tank (3), an anoxic tank (4), an aerobic tank (5) and a secondary sedimentation tank (6), ammonia nitrogen in the sewage is removed, organic matters are degraded, and the sewage is temporarily stored in an intermediate water tank (7);
c, the sewage treated in the step B enters an electrochemical dephosphorization system for dephosphorization, and the sewage after dephosphorization enters an aerobic tank (5) through a water outlet pipe (900) for nitration, so that ammonia nitrogen in the sewage is further removed;
d, treating the sewage with the phosphorus not exceeding the standard in the intermediate tank (7) by an advanced treatment unit, and discharging the sewage after reaching the standard.
9. The method of claim 8, wherein the current density is 40-60 mA/cm during electrochemical phosphorus removal 2 The electrolysis time is 15-30 minutes.
10. The method according to claim 8, wherein the sewage pretreatment in the step A is that the sewage is subjected to a first pretreatment tank (1) to remove larger dregs and then to a second pretreatment tank (2) to remove small particle impurities; further, in the step B, the sewage passes through an anaerobic tank (3), so that macromolecular organic matters in the sewage are converted into micromolecular organic matters, carbon sources in the sewage are consumed, and the COD of the sewage is reduced; further, sewage treated by the anaerobic tank (3) enters the anoxic tank (4) for preliminary sedimentation, and the sewage after the preliminary sedimentation enters the aerobic tank (5) to degrade small molecular organic matters, nitrify ammonia nitrogen in the sewage, remove the ammonia nitrogen in the sewage and further reduce COD of the sewage; further, the sewage in the aerobic tank (5) flows back to the anoxic tank (4) through a mixed liquid return pipeline (17), so that the untreated sewage flows back to the anoxic tank (4) for circular treatment; further, ammonia is removed through the anaerobic tank (3), the sewage after nitrogen enters a secondary sedimentation tank (6) for secondary sedimentation, and sediments generated in the sewage are removed through secondary sedimentation; further, sewage enters the dephosphorization tank (8) through the water inlet pipe (800), dephosphorization is carried out through the electrode plate (804), the sewage after dephosphorization flows into the drainage tank (9) for sedimentation, and then is discharged out of the drainage tank (9) through the water outlet pipe (900); further, sewage with phosphorus not exceeding the standard in the intermediate water tank (7) is sent into the denitrification deep bed filter (10), a carbon source or a flocculating agent is added into the denitrification deep bed filter (10), nitrate nitrogen is further removed through the denitrification deep bed filter (10) and is converted into nitrogen, and finally the treated sewage enters the fiber rotary disc filter (11) to remove SS and is disinfected through the ultraviolet disinfection channel (12) and then is discharged after reaching the standard; further, the carbon source sodium acetate and the flocculating agent are PAC; furthermore, sediments in the anaerobic tank (3), the secondary sedimentation tank (6), the dephosphorization tank (8) and the drainage tank (9) can be sent into the sludge concentration tank (13) through a reflux pump (19) on a sludge reflux pipe (18) and then sent into the sludge modification bin (15); further, the modifier in the material tank (14) is conveyed into the sludge modification bin (15), so that the sludge entering the sludge modification bin (15) is fully reacted with the modifier, after the sludge is reacted in the sludge modification bin (15), the sludge in the sludge modification bin (15) is conveyed into a filter press (16), and is directly discharged after being subjected to filter pressing and dehydration through the filter press (16).
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| CN102001784A (en) * | 2010-10-18 | 2011-04-06 | 余静 | High efficiency low energy consumption urban sewage dephosphorization denitrification treatment method |
| CN211972065U (en) * | 2019-12-17 | 2020-11-20 | 陕西鼓风机（集团）有限公司 | Urban sewage treatment system |
| CN212425722U (en) * | 2019-12-11 | 2021-01-29 | 浙江美纳环保科技有限公司 | Electrochemical phosphorus removal device |
| CN114291964A (en) * | 2021-12-10 | 2022-04-08 | 无锡市政设计研究院有限公司 | Sewage treatment system and method for denitrification and phosphorus recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001784A (en) * | 2010-10-18 | 2011-04-06 | 余静 | High efficiency low energy consumption urban sewage dephosphorization denitrification treatment method |
| CN212425722U (en) * | 2019-12-11 | 2021-01-29 | 浙江美纳环保科技有限公司 | Electrochemical phosphorus removal device |
| CN211972065U (en) * | 2019-12-17 | 2020-11-20 | 陕西鼓风机（集团）有限公司 | Urban sewage treatment system |
| CN114291964A (en) * | 2021-12-10 | 2022-04-08 | 无锡市政设计研究院有限公司 | Sewage treatment system and method for denitrification and phosphorus recovery |
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