CN111377538A - Sequencing batch fluidized bed sewage treatment system, control system and treatment method - Google Patents
Sequencing batch fluidized bed sewage treatment system, control system and treatment method Download PDFInfo
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- CN111377538A CN111377538A CN202010211021.3A CN202010211021A CN111377538A CN 111377538 A CN111377538 A CN 111377538A CN 202010211021 A CN202010211021 A CN 202010211021A CN 111377538 A CN111377538 A CN 111377538A
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- 238000011282 treatment Methods 0.000 title claims abstract description 40
- 239000010865 sewage Substances 0.000 title claims abstract description 24
- 238000012163 sequencing technique Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 287
- 238000004062 sedimentation Methods 0.000 claims abstract description 38
- 238000005273 aeration Methods 0.000 claims abstract description 34
- 238000010992 reflux Methods 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims description 47
- 238000001914 filtration Methods 0.000 claims description 47
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 29
- 238000009826 distribution Methods 0.000 claims description 29
- 229910052698 phosphorus Inorganic materials 0.000 claims description 29
- 239000011574 phosphorus Substances 0.000 claims description 29
- 229910021536 Zeolite Inorganic materials 0.000 claims description 20
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 20
- 239000010457 zeolite Substances 0.000 claims description 20
- 238000001179 sorption measurement Methods 0.000 claims description 19
- 239000012767 functional filler Substances 0.000 claims description 18
- 238000011049 filling Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 238000004065 wastewater treatment Methods 0.000 claims description 10
- 241001464837 Viridiplantae Species 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 210000005056 cell body Anatomy 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 27
- 231100000719 pollutant Toxicity 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 12
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 21
- 229910052799 carbon Inorganic materials 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 17
- 239000007789 gas Substances 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000001546 nitrifying effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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
- C02F3/006—Regulation methods for biological 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
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to a sequencing batch fluidized bed sewage treatment system, a control system and a treatment method, which comprises a tank body, wherein a sedimentation tank and a fluidized bed are sequentially arranged in the tank body from one end, the multifunctional filter tank and the water outlet channel are also arranged in the tank body, the reflux control tank is respectively adjacent to the fluidized bed and the sedimentation tank, the fluidized bed is connected with a water inlet pipe, the water outlet channel is provided with a water outlet pipe, the fluidized bed, the multifunctional filter tank and the bottom of the water outlet channel are communicated, an aeration device is installed in the fluidized bed, the aeration device discharges raw water in the fluidized bed into the sedimentation tank, water in the sedimentation tank overflows and is placed into the reflux control tank, an air lifting device is installed on the reflux control tank and conveys the water in the reflux control tank to the multifunctional filter tank and the water outlet channel, and the water outlet channel and the water treated by the multifunctional filter tank flow back to the fluidized bed from the bottom communicated position to form circulation. The invention has the effect of optimizing the degradation and removal of pollutants.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system, a control system and a treatment method of a sequencing batch fluidized bed.
Background
Water resources are an important material basis for the survival of people, water pollution is serious day by day at present, domestic sewage is an important source of water pollution, most of rural domestic sewage is directly discharged at present and is treated through simple biodegradation, and the treatment mode is low in efficiency and incomplete in treatment.
Chinese patent publication No. CN106219883A discloses a rural wastewater treatment method, which comprises aerating and precipitating, injecting wastewater into a regulating tank to regulate pH, then sequentially passing through an aerobic tank, a sand filter tank and an anaerobic tank to complete nitrification of ammonia nitrogen and degradation of biological oxygen consumption, entering into a concentrated sludge pipe for treatment, and finally performing filtration and aeration to complete reforming treatment. In this solution, the water needs to be treated in multiple treatments and finally discharged, each device is treated once, and the treatment mode is single, so that the whole treatment is incomplete, therefore, the improvement of the treatment is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a sequencing batch fluidized bed sewage treatment system with high utilization rate.
The above object of the present invention is achieved by the following technical solutions:
a sequencing batch fluidized bed sewage treatment system comprises a tank body, wherein a sedimentation tank, a fluidized bed, a multifunctional filtering tank and a water outlet channel are sequentially arranged at one end in the tank body, a reflux control groove is also arranged in the tank body, the reflux control groove is respectively adjacent to the fluidized bed and the sedimentation tank, the fluidized bed is connected with a water inlet pipe, the water outlet channel is provided with a water outlet pipe, the fluidized bed, the multifunctional filter tank and the bottom of the water outlet channel are communicated, an aeration device is arranged in the fluidized bed and discharges raw water in the fluidized bed into a sedimentation tank, the water in the sedimentation tank overflows and is arranged in a reflux control groove, an air lifting device is arranged on the reflux control groove, the air stripping device conveys the water in the reflux control tank to the multifunctional filtering tank and the water outlet channel, and the water outlet channel and the water treated by the multifunctional filter tank flow back to the fluidized bed from the bottom communication position to form circulation.
By adopting the technical scheme, raw water is injected from the fluidized bed, the bottom of the fluidized bed is communicated with the multifunctional filter tank and the water outlet channel, namely water can be injected simultaneously, the air stripping backflow water for air stripping in the backflow control groove raises the liquid levels of the multifunctional filter tank and the water outlet channel, and under the combined action of pressure difference and fluidized bed aeration lifting, the water in the water outlet channel and the filter tank flows to the fluidized bed in complex flow states of vertical flow, horizontal flow, oblique flow and the like and enters the backflow control area after passing through the sedimentation tank. The upper part of the multifunctional filter tank and a local area close to the fluidized bed form an aerobic nitrification state to generate the nitrification reaction of ammonia nitrogen, while the lower area of the filter tank is particularly close to a water outlet channel area to form an anaerobic and anoxic environment, and carbon source pollutants in raw water and nitrified water generate denitrification and phosphorus release reactions. And (3) carrying out aerobic degradation on the carbon source pollutants in the raw water in the fluidized bed and degrading TP. In the cyclic reciprocating process, pollutants such as COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus) and the like in the raw water are gradually degraded and removed. During initial reflux, because the concentration of the whole pollutants is high and the supply of dissolved oxygen is insufficient, anaerobic and aerobic dephosphorization reactions are taken as main reactions, and ammonia nitrogen is adsorbed and enriched on zeolite. In the later period, along with the increase of the integral dissolved oxygen level of the system, the anoxic and aerobic TN is mainly removed, and the ammonia nitrogen is biologically regenerated. Anaerobic, anoxic and aerobic reactions are transited, so that the carbon source is prevented from being robbed when TN and TP are removed, and the biological phosphorus removal effect is optimized. The zeolite and the phosphorus removal functional filler have the functions of clipping, regulating and stabilizing TN and TP accidental fluctuation of raw water. In the position of the fluidized bed, raw water generates carbon source pollutant removal reaction, the speed is high, the load is high, the utilization rate of dissolved oxygen is high, the whole system can continuously perform water circulation and treatment, and in the sewage treatment process, the link with the maximum sludge yield (degradation of carbon source pollutants) is stripped from the multifunctional filtering pond, so that the problems of sludge production and blockage in the filtering pond area can be effectively relieved, and the rural sewage treatment operation is more convenient and more labor-saving.
The present invention in a preferred example may be further configured to: the aeration device is arranged at the bottom of the fluidized bed, suspended biological filler is filled in the fluidized bed, and the proportion of the suspended biological filler filled in the fluidized bed is 10-50%.
Through adopting above-mentioned technical scheme, can carry out biological carbon source pollutant through suspension biological filler and get rid of, through the aeration, provide sufficient oxygen for the reaction simultaneously.
The present invention in a preferred example may be further configured to: the multifunctional filter tank is internally filled with a combined filler, the thickness of the combined filler is set to be 1-4m, the combined filler is sequentially set into a gravel filler, a zeolite filler and a phosphorus adsorption functional filler from top to bottom, the particle size of the gravel filler, the particle size of the zeolite filler and the particle size of the phosphorus adsorption functional filler are sequentially increased and set, and the filling thickness of the gravel filler, the filling thickness of the zeolite filler and the filling thickness of the phosphorus adsorption functional filler are sequentially increased and set.
The present invention in a preferred example may be further configured to: and green plants are arranged on the surface of the multifunctional filtering tank.
The present invention in a preferred example may be further configured to: the particle size of the gravel filler is 3-5mm, the thickness of the gravel filler is 300mm, the particle size of the zeolite filler is 8-10mm, the thickness of the zeolite filler is 500mm, the particle size of the phosphorus adsorption functional filler is 20-40mm, and the thickness of the phosphorus adsorption functional filler is 1000 mm.
By adopting the technical scheme, the preparation of the fillers with different particle sizes and thicknesses is beneficial to plant growth, nitrification and denitrification reaction and phosphorus removal, and the uppermost layer adopts a fine particle size, so that organic matters remained in raw water are left above the uppermost layer, and green plants can be conveniently planted. The planting of the green plants can further adsorb and remove pollutants and utilize developed root systems to convey oxygen to the filter tank. Meanwhile, the zeolite filler can adsorb ammonia nitrogen by using cation exchange effect and has peak clipping stabilization effect on inlet water high ammonia nitrogen fluctuation. Nitrifying bacteria are attached to the surface of the zeolite to convert adsorbed ammonia nitrogen into nitrate nitrogen, so that biological regeneration of the zeolite is realized.
The present invention in a preferred example may be further configured to: the phosphorus adsorption functional filler is composed of a porous adsorption material rich in calcium, iron, aluminum and other components.
By adopting the technical scheme, after part of phosphorus is absorbed and biologically removed by plants, the removal can be further enhanced.
The present invention in a preferred example may be further configured to: the gravel packing is inside to be arranged a plurality of water-distribution pipes, the water-distribution pipe extends to in the ditch, a plurality of holes of permeating water have been seted up on the water-distribution pipe, still be provided with the water distribution house steward on the multi-functional filtering ponds, the water-distribution pipe all with water distribution house steward UNICOM, be connected with the air-lift water pipe on the water distribution house steward, the air-lift water pipe extends to the reflux control groove, set up in the reflux control groove and extend the inlet tube, extend inlet tube and air-lift water piping connection, and extend the inlet tube and extend towards reflux control tank bottom portion, the air-lift device is installed on extending inlet tube or air-lift water pipe, be provided with.
Through adopting above-mentioned technical scheme, the water distributor is laid in the gravel packs to the raw water can be followed and permeated through downthehole, thereby let hydroenergy permeate respectively from the upper surface of multi-functional filtering ponds more even respectively, let the raw water as much as possible fill up the area of whole multi-functional filtering ponds, make things convenient for the processing of raw water, improve treatment effeciency and speed.
The present invention in a preferred example may be further configured to: adopt baffle isolation formation between sedimentation tank, fluidized bed, multi-functional filtering ponds, play ditch and the backward flow control tank respectively, all be provided with in a plurality of perforation on baffle between fluidized bed and the multi-functional filtering ponds and the baffle between play ditch and the multi-functional filtering ponds, interior perforation sets up at the bottom of the pool that is close to multi-functional filtering ponds and sets up, install the outlet pipe on the cell body, leave the clearance between outlet pipe and the play ditch bottom.
Through adopting above-mentioned technical scheme, the baffle can cut off the cell body, and interior perforation can prevent that the filler in the multi-functional filtering pond from entering into fluidized bed and play ditch in, when keeping the stability of the structure in the multi-functional filtering pond, lets multi-functional filtering pond in order to communicate with play ditch and fluidized bed bottom respectively. The water outlet pipe is used for draining water, a certain gap is reserved between the water outlet pipe and the water outlet channel, on one hand, residual impurities in water can not easily enter the water outlet pipe to cause blockage, meanwhile, part of water can be reserved for processing in the next period, when inflow water in the next period is injected, carbon source pollutants in raw water are mixed with residual nitrifying liquid in the last period in the pool, part of total nitrogen is removed under the action of denitrification, and the concentration of the carbon source pollutants is reduced.
The second purpose of the invention is to provide a control system which is convenient to control the sewage treatment system.
A control system comprises a controller, a water level sensor arranged in a fluidized bed, a control valve arranged on a water outlet pipe and a raw water pump arranged on a water inlet pipe, wherein the water level sensor is connected with the controller, the controller is respectively connected with the control valve, the raw water pump, an air lifting device and an aeration device, the water level sensor transmits a water level signal to the controller, and the controller controls the control valve, the raw water pump, the air lifting device and the aeration device to work
Through adopting above-mentioned technical scheme, adopt opening and close of controller to each equipment, let its degree of automation be high, do not need artifical guard, improve its practicality.
The third purpose of the invention is to provide a sewage treatment method adopting the sewage treatment system.
A method for sewage treatment comprises the following operation steps:
STEP 1: keeping a control valve on a water outlet pipe closed, starting a raw water pump to inject water into the fluidized bed, communicating the fluidized bed, the multifunctional filter tank and the bottom of the water outlet channel, and simultaneously injecting water into the fluidized bed, the multifunctional filter tank and the water outlet channel;
STEP 2: performing aeration and continuously injecting water:
STEP 3: when the fluidized bed, the multifunctional filter tank and the water outlet channel are filled with water, the water inlet is closed, and the gas stripping is started;
STEP 4: continuing aeration and gas stripping to enable water to be circularly treated in the system, and then closing the gas stripping device and the aeration device;
STEP 5: opening the water outlet pipe, draining water from the water outlet channel, not emptying the water in the tank body, and closing the water outlet pipe after the water drainage is finished;
STEP 6: and starting the raw water pump to inject water, and entering the next operation period.
By adopting the technical scheme, the method is adopted for sewage treatment, and aerobic, anaerobic and anoxic sewage can be excessively changed, so that the carbon source is prevented from being robbed when TN and TP are removed, the biological phosphorus removal effect is optimized, meanwhile, carbon source pollutants in raw water are mixed with residual nitrifying liquid in the previous period in the tank, part of total nitrogen is removed under the denitrification effect, and the concentration of the carbon source pollutants is reduced.
In summary, the invention includes at least one of the following beneficial technical effects:
1. in the cyclic reciprocating process, pollutants such as COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus) and the like in the raw water are gradually degraded and removed;
2. the problems of mud production and blockage in a filter tank area are effectively relieved, and rural sewage treatment is more convenient and more convenient to operate;
3. the aerobic, anaerobic and anoxic can be changed excessively, so that the carbon source is prevented from being robbed when TN and TP are removed, the biological phosphorus removal effect is optimized, meanwhile, carbon source pollutants in raw water are mixed with the residual nitrifying liquid in the previous period in the tank, part of total nitrogen is removed under the denitrification effect, and the concentration of the carbon source pollutants is reduced.
Drawings
FIG. 1 is a flow diagram of a wastewater treatment system.
FIG. 2 is a structural arrangement of the sewage treatment system.
Fig. 3 is a cross-sectional view a-a of fig. 2.
Fig. 4 is a sectional view of B-B in fig. 2.
Fig. 5 is a cross-sectional view of C-C in fig. 2.
FIG. 6 is a structural view of a water distributor;
fig. 7 is a control system program diagram.
Reference numerals: 1. a tank body; 11. a water outlet pipe; 12. a control valve; 2. a baffle plate; 21. inner perforation; 3. a fluidized bed; 31. a water inlet pipe; 32. a raw water pump; 33. an aeration device; 34. suspending biological fillers; 4. a sedimentation tank; 41. a central tube; 42. an injection pipe; 43. a water baffle; 44. an overflow weir; 5. a reflux control tank; 6. a water outlet channel; 7. a multifunctional filter tank; 71. a gravel pack; 72. a zeolite filler; 73. a phosphorus adsorption functional filler; 74. a water distribution pipe; 741. water permeable holes; 75. a water distribution header pipe; 76. gas stripping water pipe; 77. an extension lead tube; 78. a green plant; 8. a gas stripping device; 91. a controller; 92. a water level sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A fluidized bed sewage treatment system is shown in figures 1 and 2 and comprises a tank body 1, a baffle 2 is arranged in the tank body 1, the tank body 1 is divided into a sedimentation tank 4, a fluidized bed 3, a multifunctional filtering tank 7, a water outlet channel 6 and a backflow control tank 5 through the baffle 2, raw water is subjected to carbon source pollutant degradation and TP removal in the fluidized bed 3, scum is removed in the sedimentation tank 4, and TN and TP removal are mainly performed in the multifunctional filtering tank 7. In operation, the water outlet channel 6 is closed, raw water enters from the fluidized bed 3, and after a certain amount of raw water is filled, the raw water injection is stopped. The raw water enters the sedimentation tank 4 from the fluidized bed 3 for sedimentation, then enters the backflow control tank 5 from the sedimentation tank 4, the water in the backflow control tank 5 is conveyed to the multifunctional filtering tank 7 for filtration, then flows into the fluidized bed 3 for circular treatment, and in the circular reciprocating process, pollutants such as COD, TN, TP and the like in the raw water are gradually degraded and removed. Wherein, the raw water is discharged through the water outlet channel 6 after the raw water passes through the fluidized bed 3, the sedimentation tank 4 and the multifunctional filtering tank 7. When the water in the water outlet channel 6 is discharged to a certain degree, the water outlet channel 6 is closed, and the raw water is injected from the position of the fluidized bed 3 again for the raw water treatment of the next period.
As shown in fig. 1 and 2, in order to facilitate the formation of the water circulation, a multifunctional filtering tank 7 is adjacent to the fluidized bed 3, a sedimentation tank 4 and a reflux control tank 5 are both adjacent to the fluidized bed 3 and are disposed at a side away from the multifunctional filtering tank 7, and the reflux control tank 5 is adjacent to the sedimentation tank 4. Meanwhile, referring to fig. 3, the bottoms of the multifunctional filtering tank 7, the fluidized bed 3 and the water outlet channel 6 are communicated, that is, a gap is left between the baffle 2 at the two sides of the fluidized bed close to the water outlet channel 6 of the multifunctional filtering tank 7 and the bottom of the tank body 1, and inner through holes 21 can be arranged at the bottoms of the baffle 2 at the two sides close to the water outlet channel 6 and the fluidized bed 3, the inner through holes 21 are arranged in the height range of 200-500 mm from the bottom of the multifunctional filtering tank 7 to the top, the hole diameter of each inner through hole 21 is 1-10mm, and the center distance between the inner through holes 21 is 50-200 mm. When raw water is injected, the water outlet channel 6, the multifunctional filtering tank 7 and the fluidized bed 3 can be directly filled.
As shown in fig. 2 and 3, a water inlet pipe 31 is provided at the top of the fluidized bed 3, a raw water pump 32 is connected to the water inlet pipe 31, and raw water is injected into the fluidized bed 3 from the water inlet pipe 31 through the raw water pump 32. The inlet tube 31 is bent towards the bottom of the fluidized bed 3, the inlet tube 31 is parallel to the baffle 2, and the tube opening of the inlet tube 31 arranged in the fluidized bed 3 is 500mm away from the bottom of the fluidized bed 3. The bottom of the fluidized bed 3 is provided with an aeration device for aerating raw water injected into the fluidized bed 3, and the aeration device can be composed of an aeration pipe or an aeration disc, so that COD at the outlet from the fluidized bed 3 to the sedimentation tank 4 is 50-80 mg/L. Meanwhile, in order to make the degradation of the whole fluidized bed 3 more sufficient, the suspended biological filler 34 is filled in the fluidized bed 3, and the suspended biological filler 34 is a sewage treatment filler commonly used in the field, so that the details are not repeated, and the proportion of the suspended biological filler in the fluidized bed is 10% -50%. In order to let the raw water enter a certain amount, aeration can be started.
As shown in fig. 2 and 3, the sedimentation tank 4 adopts a vertical flow structure, and the top of the sedimentation tank directly discharges water to flow into the backflow control tank 5. Be provided with center tube 41 in sedimentation tank 4 is inside, install the filling tube 42 on fluidized bed 3's baffle 2, filling tube 42 one end is arranged in fluidized bed 3, the other end lets in center tube 41, filling tube 42 is leading-in to sedimentation tank 4 with the water in the fluidized bed 3 in, can install the pump on the filling tube 42, directly pump (not drawing), and this application adopts sedimentation tank 4 to be less than the baffle 2 setting of fluidized bed 3, let filling tube 42 arrange the height that the one end height of fluidized bed 3 is higher than the height of arranging center tube 41 one end in, directly let water flow in sedimentation tank 4.
As shown in fig. 2 and 4, a water baffle 43 is disposed in the sedimentation tank 4 near the baffle 2 of the backflow control tank 5 for blocking scum, the gap between the water baffle 43 and the baffle 2 is 50-200mm, the height of the lower part of the water baffle 43 is 100-200mm, the height of the upper part of the water baffle 43 is equal to the height of the wall of the sedimentation tank 4, or is 100-200mm higher than the water surface. An overflow pipe or an overflow weir 44 is provided on the sedimentation tank 4, the water in the sedimentation tank 4 passes through the water baffle 43 to shield the scum, and the water overflows the water baffle 43 and flows into the backflow control tank 5 from the overflow pipe or the overflow weir 44. And the two sides of the sedimentation tank 4 are respectively provided with a backflow control groove 5, and water in the sedimentation tank 4 can respectively flow into the backflow control grooves 5 on the two sides.
In order to make the water in the reflux control tank 5 flow into the multifunctional filtering tank 7, the gas stripping device 8 is adopted for gas stripping, and the gas quantity of the gas stripping device 8 is adjusted according to different treatment periods, so that the amount of the refluxed water is 50-200% of the volume of the whole water.
As shown in fig. 2 and 3, the multifunctional filter tank 7 is filled with a combined filler, and a nitrification reaction, a denitrification reaction, and a phosphorus removal reaction occur through the combined filler. The thickness of the combined filler may be generally 1 to 4m, preferably 1.5 to 2.5m, and the thickness adopted in this example is 1.8 m. Specifically, it is from the surface of multi-functional filtering ponds 7 to the bottom in proper order in this embodiment: a gravel filler 71 with the grain diameter of 3-5mm, a zeolite filler 72 with the grain diameter of 8-10mm and a phosphorus adsorption functional filler 73 with the grain diameter of 20-40 mm. Wherein the filling thickness of the gravel filler 71 is 300mm, the filling thickness of the zeolite filler 72 is 500mm, the thickness of the phosphorus adsorption functional filler 73 is 1000mm, and the phosphorus adsorption functional filler 73 is a porous adsorption material rich in calcium, iron, aluminum and other components. Referring to fig. 6 in combination, a plurality of water distribution pipes 74 are arranged inside the gravel packing 71, and the center distance between the water distribution pipes 74 is 100-400mm, preferably 200mm, the central axis direction of the water distribution pipes 74 is set from the fluidized bed 3 to the water outlet channel 6, the water distribution pipes 74 penetrate through the water outlet channel 6 and the baffle 2 between the multifunctional filtering ponds 7, and the water distribution pipes 74 are perpendicular to the baffle 2 between the fluidized bed 3 and the multifunctional filtering ponds 7. The water distribution pipe 74 is provided with water permeable holes 741 with a hole diameter of 1-10mm, and the center distance of the water permeable holes 741 is 100-500 mm.
As shown in fig. 2 and 5, a water distribution header pipe 75 is further disposed on the multifunctional filtration tank 7, one end of each water distribution pipe 74 is communicated with the water distribution header pipe 75, the other end of each water distribution pipe extends into the water outlet channel 6, the water distribution header pipe 75 is generally disposed in parallel with the baffle 2 between the fluidized bed 3 and the multifunctional filtration tank 7, an air-stripping water pipe 76 is connected to the water distribution header pipe 75, the air-stripping water pipe 76 extends into the reflux control tank 5, the number of the air-stripping water pipes 76 is the same as that of the reflux control tank 5, and an extension guide pipe 77 that is bent towards the bottom of the tank is formed at one end of the air-stripping water pipe 76 that extends into. The stripping means 8 is mounted on a stripping water pipe 76 or an extension lead pipe 77.
As shown in fig. 2 and 3, a green plant 78 is planted on the upper surface of the multifunctional filtering tank 7 to form a benign circulating ecosystem, and oxygen is supplied to the multifunctional filtering tank 7 through the root system of the green plant 78. Generally, the green plants 78 are selected to plant plants with developed root systems and stronger pollutant absorption capacity, so that a good ecological system can be formed near the root systems, the treatment effect of various pollutants is enhanced, the sludge production is further reduced, and the energy consumption level is reduced.
After completing the cyclic treatment of several cycles, the water is discharged from the outlet channel 6, referring to fig. 2 and fig. 3, in order to make the water not completely discharged, a water outlet pipe 11 is installed on the tank body 1, the height of the water outlet pipe 11 from the bottom of the outlet channel 6 is 300 and 500mm, and meanwhile, for convenience of control, a control valve 12 is installed on the water outlet pipe 11, and the control valve 12 is formed by a normally closed electromagnetic valve to control the opening and closing of the water outlet pipe 11.
The system is further provided with a control system, as shown in fig. 7, the control system comprises a controller 91 and a water level sensor 92 installed on the fluidized bed 3, the controller 91 can be formed by a PLC or a central processor, the controller 91 respectively controls the gas stripping device 8, the aeration device 33, the raw water pump 32 and the control valve 12, and the water level sensor 92 is connected with the controller 91. During operation, the controller 91 controls the raw water pump 32 to start to inject water, when the water level sensor 92 monitors that the water level reaches a specified height, namely the depth reaches 1.2m, the controller 91 starts the aeration device 33 and continuously controls the raw water pump 32 to continuously inject water, when the water level sensor 92 detects that the water is full, the controller 91 closes the raw water pump 32 and controls the aeration device 33 and the gas stripping device 8 to continuously operate, and the controller 91 starts to time aeration and gas stripping at the moment, when the time reaches the standard, generally 1-4h, the aeration device 33 and the gas stripping device 8 are closed, and simultaneously the controller 91 opens the control valve 12 to drain water, and simultaneously performs water drainage timing, when the water drainage reaches the standard, generally the water drainage time reaches 1-2h, the control valve 12 is closed, and the raw water pump 32 is restarted to inject water, and a next operation period is performed.
The processing system runs:
STEP 1: and keeping the control valve 12 on the water outlet pipe 11 closed, starting the raw water pump 32 to inject water into the fluidized bed 3, communicating the fluidized bed 3, the multifunctional filter tank 7 and the bottom of the water outlet channel 6, and simultaneously injecting water into the fluidized bed 3, the multifunctional filter tank 7 and the water outlet channel 6.
STEP 2: when the water level sensor 92 detects that the water depth in the fluidized bed 3 reaches a certain degree, the water depth is generally 1.2m, the aeration is carried out, the water injection is continued, and the whole water injection time is 1-2 h.
STEP 3: when the fluidized bed 3, the multifunctional filtering tank 7 and the water outlet channel 6 are filled with water, the water inlet is closed, and the gas stripping is started.
STEP 4: and continuously aerating and air stripping for 1-4h, circulating the water in the system, and then closing the air stripping device 8 and the aeration device 33.
STEP 5: and opening the water outlet pipe 11, draining water from the water outlet channel 6 for 1-2h, wherein the water in the tank body 1 is not drained, and closing the water outlet pipe 11 after the water drainage is finished.
STEP 6: the raw water pump 32 is started to inject water, and the next operation cycle is started.
When raw water is injected and the water depth in the fluidized bed 3 pool reaches 1.2m, aeration is started, and the carbon source pollutant concentration in the fluidized bed 3 area is further reduced. In STEP4, the stripping reflux water from the reflux control tank 5 raises the liquid level of the filter and the water outlet channel 6, and under the combined action of pressure difference and aeration lifting of the fluidized bed 3, the water in the water outlet channel 6 and the multifunctional filter tank 7 flows to the fluidized bed 3 in complex flow states of vertical flow, horizontal flow, oblique flow and the like, and enters the reflux control area after passing through the sedimentation tank 4. The upper part of the multifunctional filter tank 7 and a local area close to the fluidized bed 3 form an aerobic nitrification state to generate nitrification reaction of ammonia nitrogen, while the lower area of the filter tank is particularly close to the area of the water outlet channel 6 to form an anaerobic and anoxic environment, and carbon source pollutants in raw water and nitrified water generate denitrification and phosphorus release reaction. The carbon source pollutants remained in the raw water are degraded in the fluidized bed 3 and TP is degraded. In the cyclic reciprocating process, pollutants such as COD, TN, TP and the like in the raw water are gradually degraded and removed. During initial reflux, due to high concentration of overall pollutants and insufficient supply of dissolved oxygen, anaerobic/aerobic dephosphorization reaction is taken as a main reaction, and ammonia nitrogen is adsorbed and enriched on zeolite. In the later period, along with the increase of the integral dissolved oxygen level of the system, the anoxic/aerobic TN is mainly removed, and the ammonia nitrogen is biologically regenerated. Anaerobic/anoxic/aerobic reaction transition change, thereby avoiding the robbing of carbon source when TN and TP are removed and optimizing the biological phosphorus removal effect. The zeolite and the phosphorus removal functional filler have the functions of clipping, regulating and stabilizing TN and TP accidental fluctuation of raw water.
In STEP5, the tank body 1 is not emptied, and the remaining part of nitrified liquid and the inlet water of the next period have denitrification reaction; and when the inflow water is injected in the next week period, carbon source pollutants in the raw water are mixed with the residual nitrifying liquid in the previous period in the tank, part of total nitrogen is removed under the denitrification effect, and the concentration of the carbon source pollutants is reduced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a sequencing batch fluidized bed sewage treatment system, includes cell body (1), its characterized in that: the sedimentation tank (4), the fluidized bed (3), the multifunctional filtering tank (7) and the water outlet channel (6) are sequentially arranged in the tank body (1) through one end, a backflow control groove (5) is further arranged in the tank body (1), the backflow control groove (5) is respectively adjacent to the fluidized bed (3) and the sedimentation tank (4), the fluidized bed (3) is connected with a water inlet pipe (31), a water outlet pipe (11) is arranged on the water outlet channel (6), the bottoms of the fluidized bed (3), the multifunctional filtering tank (7) and the water outlet channel (6) are arranged to be communicated, an aeration device (33) is arranged in the fluidized bed (3), raw water in the fluidized bed (3) is discharged into the sedimentation tank (4) through the aeration device (33), a backflow control groove (5) is arranged for overflowing water in the sedimentation tank (4), and an air stripping device (8) is arranged on the backflow control groove (5), the air stripping device (8) conveys water in the backflow control tank (5) to the multifunctional filtering tank (7) and the water outlet channel (6), and the water outlet channel (6) and the water treated by the multifunctional filtering tank (7) flow back to the fluidized bed (3) from a bottom communication position to form circulation.
2. The sequencing batch fluidized bed wastewater treatment system of claim 1, wherein: the aeration device (33) is arranged at the bottom of the fluidized bed (3), the fluidized bed (3) is filled with suspended biological fillers (34), and the proportion of the suspended biological fillers (34) filled into the fluidized bed (3) is 10-50%.
3. The sequencing batch fluidized bed wastewater treatment system of claim 1, wherein: the multifunctional filter tank (7) is filled with a combined filler, the thickness of the combined filler is set to be 1-4m, the combined filler is sequentially set into a gravel filler (71), a zeolite filler (72) and a phosphorus adsorption functional filler (73) from top to bottom, the particle size of the gravel filler (71), the particle size of the zeolite filler (72) and the particle size of the phosphorus adsorption functional filler (73) are sequentially increased, and the filling thickness of the gravel filler (71), the filling thickness of the zeolite filler (72) and the filling thickness of the phosphorus adsorption functional filler (73) are sequentially increased; and green plants (8) are arranged on the surface of the multifunctional filtering tank (7).
4. The sequencing batch fluidized bed wastewater treatment system of claim 3, wherein: and green plants (8) are arranged on the surface of the multifunctional filtering tank (7).
5. The sequencing batch fluidized bed wastewater treatment system of claim 3, wherein: the particle size of the gravel filler (71) is 3-5mm, the thickness of the gravel filler (71) is 300mm, the particle size of the zeolite filler (72) is 8-10mm, the thickness of the zeolite filler (72) is 500mm, the particle size of the phosphorus adsorption functional filler (73) is 20-40mm, and the thickness of the phosphorus adsorption functional filler is 1000 mm.
6. The sequencing batch fluidized bed wastewater treatment system of claim 3, wherein: the phosphorus adsorption functional filler (73) is made of porous adsorption materials rich in calcium, iron, aluminum and other components.
7. The sequencing batch fluidized bed wastewater treatment system of claim 3, wherein: a plurality of water distribution pipes (74) are arranged inside the gravel packing (71), the water distribution pipes (74) extend into the water outlet channel (6), a plurality of permeable holes (741) are arranged on the water distribution pipe (74), a water distribution header pipe (75) is also arranged on the multifunctional filtering tank (7), the water distribution pipes (74) are communicated with a water distribution header pipe (75), the water distribution header pipe (75) is connected with an air stripping water pipe (76), the gas stripping water pipe (76) extends to the reflux control tank (5), an extension guide pipe (77) is arranged in the reflux control tank (5), the extension guide pipe (77) is connected with the gas stripping water pipe (76), and the extension guide pipe (77) extends towards the bottom of the reflux control tank (5), the air stripping device (8) is arranged on the extension guide pipe (77) or the air stripping water pipe (76), and the water distribution pipe (74) is provided with a plurality of water permeable holes (741).
8. The sequencing batch fluidized bed wastewater treatment system of claim 1, wherein: adopt baffle (2) to keep apart between sedimentation tank (4), fluidized bed (3), multi-functional filtering ponds (7), play ditch (6) and backflow control groove (5) respectively and form, all be provided with in a plurality of perforation (21) on baffle (2) between fluidized bed (3) and multi-functional filtering ponds (7) and baffle (2) between play ditch (6) and multi-functional filtering ponds (7), interior perforation (21) set up and set up at the bottom of the pool that is close to multi-functional filtering ponds (7), install outlet pipe (11) on cell body (1), leave the clearance between outlet pipe (11) and play ditch (6) bottom.
9. A control system for use in a sequencing batch fluidized bed wastewater treatment system as claimed in any of claims 1 to 8, wherein: including controller (91), set up level sensor (92) in fluidized bed (3), install control valve (12) on outlet pipe (11) and install raw water pump (32) on inlet tube (31), level sensor (92) are connected with controller (91), controller (91) are connected with control valve (12), raw water pump (32), air stripping device (8) and aeration equipment (33) respectively, level sensor (92) transmit water level signal to controller (91), controller (91) control valve (12), raw water pump (32), air stripping device (8) and aeration equipment (33) work.
10. A method for sewage treatment using a sequencing batch fluidized bed sewage treatment system according to any of claims 1 to 8, comprising the steps of:
STEP 1: keeping a control valve (12) on a water outlet pipe (11) closed, starting a raw water pump (32) to inject water into the fluidized bed (3), communicating the fluidized bed (3), the multifunctional filter tank (7) and the bottom of a water outlet channel (6), and simultaneously injecting water into the fluidized bed (3), the multifunctional filter tank (7) and the water outlet channel (6);
STEP 2: performing aeration and continuously injecting water:
STEP 3: when the fluidized bed (3), the multifunctional filter tank (7) and the water outlet channel (6) are filled with water, the water inlet is closed, and the gas stripping is started;
STEP 4: continuously aerating and air stripping to enable water to be circularly treated in the system, and then closing the air stripping device (8) and the aeration device (33);
STEP 5: the water outlet pipe (11) is opened, water is discharged from the water outlet channel (6), the water in the tank body (1) is not emptied, and the water outlet pipe (11) is closed after the water discharge is finished;
STEP 6: and starting the raw water pump (32) to inject water, and entering the next operation period.
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| CN1562824A (en) * | 2004-03-26 | 2005-01-12 | 山东科技大学 | System of treating and reclaiming sewage in biotope |
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| WO2018040753A1 (en) * | 2016-08-29 | 2018-03-08 | 武汉东川自来水科技开发有限公司 | Double-biomembrane sewage treatment system and method |
| CN212222564U (en) * | 2020-03-24 | 2020-12-25 | 上海巷西环境科技有限公司 | Sequencing batch fluidized bed sewage treatment system and control system |
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- 2020-03-24 CN CN202010211021.3A patent/CN111377538A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562824A (en) * | 2004-03-26 | 2005-01-12 | 山东科技大学 | System of treating and reclaiming sewage in biotope |
| CN105502826A (en) * | 2015-12-24 | 2016-04-20 | 安徽华骐环保科技股份有限公司 | Efficient nitrogen and phosphorus removal waste water treatment process and device |
| WO2018040753A1 (en) * | 2016-08-29 | 2018-03-08 | 武汉东川自来水科技开发有限公司 | Double-biomembrane sewage treatment system and method |
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