CN113698051A - Sewage treatment station upgrading reconstruction treatment system and sewage treatment method - Google Patents
Sewage treatment station upgrading reconstruction treatment system and sewage treatment method Download PDFInfo
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- CN113698051A CN113698051A CN202111180664.7A CN202111180664A CN113698051A CN 113698051 A CN113698051 A CN 113698051A CN 202111180664 A CN202111180664 A CN 202111180664A CN 113698051 A CN113698051 A CN 113698051A
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- 239000010865 sewage Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 238000004873 anchoring Methods 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 25
- 239000011574 phosphorus Substances 0.000 claims abstract description 25
- 239000010802 sludge Substances 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002407 reforming Methods 0.000 claims abstract description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
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- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 claims description 15
- 241000894006 Bacteria Species 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 9
- 239000002351 wastewater Substances 0.000 claims description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 229910019142 PO4 Inorganic materials 0.000 claims description 7
- 238000004065 wastewater treatment Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 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 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- 239000000969 carrier Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000011362 coarse particle Substances 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 206010021143 Hypoxia Diseases 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 claims description 2
- 230000016615 flocculation Effects 0.000 claims description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims 1
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- 230000008569 process Effects 0.000 abstract description 5
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- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000001205 polyphosphate Substances 0.000 description 2
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- 229920000388 Polyphosphate Polymers 0.000 description 1
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Classifications
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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
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
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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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage treatment station upgrading and reforming treatment system and a sewage treatment method, wherein the system comprises a biochemical treatment system, the biochemical treatment system comprises a biochemical tank and a secondary sedimentation tank, the biochemical tank reforming comprises reforming an original aerobic tank into an aerobic tank 1, a facultative tank and an aerobic tank 2, a biological carrier, activated sludge and an anchoring agent are added into the reformed biochemical tank, and the secondary sedimentation tank is reformed into a high-efficiency sedimentation tank. The invention also discloses a method for treating sewage by using the treatment system. The sewage treatment system after the upgrading and transformation of the invention uses the AOAO process and the high-efficiency precipitation method, and can still realize the high-efficiency carbon removal, nitrogen removal and phosphorus removal of the sewage treatment system on the advantages of low construction cost and low cost operation.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment station upgrading and reforming treatment system and a sewage treatment method.
Background
At present, the current situation of water resources has the problems of shortage of total amount, low per capita occupancy, uneven regional distribution, increasingly serious water pollution, prominent urban water shortage and the like. In order to improve and improve the water environment quality, the discharge standard of urban sewage treatment is inevitably improved. At present, more strict effluent discharge standards including COD are provided for newly built or newly expanded sewage treatment plantsCr(chemical oxygen demand), TN (total nitrogen), NH3N (ammonia nitrogen) and TP (total phosphorus). In the new standardUnder the circumstances, upgrading and modification work of sewage treatment plants (stations) is becoming more urgent.
The upgrading and reconstruction work of the sewage plant (station) is to take the economic and energy-saving benefits, optimize the conditions of process, technology, equipment, operation parameters and the like and enhance the treatment capacity of the sewage plant (station) on the basis of the current situation of the original engineering so as to meet higher effluent discharge standards.
Disclosure of Invention
The invention aims to solve the technical problem that the sewage treatment station upgrading and modifying system is provided aiming at the defects of the prior art, and the COD and NH can be effectively improved by modifying an aerobic tank and arranging a high-efficiency sedimentation tank3The removal rates of N, TN and TP are increased, the purposes of energy conservation, efficiency improvement and capacity expansion are achieved, and the method is very suitable for upgrading and modifying the existing old sewage treatment plants (stations). The invention also provides a method for modifying the post-treatment system to carry out sewage treatment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a sewage treatment station carries mark transformation processing system, includes biochemical treatment system, biochemical treatment system include biochemical pond and two heavy ponds, biochemical pond transformation is including adding two corrosion resistant plate in former good oxygen pond, former good oxygen pond is transformed into good oxygen pond 1, facultative anaerobic pond and good oxygen pond 2, biochemical pond transform the back and include A1 oxygen deficiency pond + O1 good oxygen pond + A2 facultative aerobic pond + O2 good oxygen pond.
Preferably, the water inlet of the biochemical treatment system is modified to include a water inlet pipeline from the newly added lifting pool to the facultative tank.
Preferably, a nitrified liquid return pipeline is arranged between the O2 aerobic tank and the A1 anoxic tank.
Preferably, a concentration tank is arranged behind the high-efficiency sedimentation tank and used for storing sludge generated by the sedimentation tank.
Preferably, a stirrer is arranged in the A2 facultative tank, so that the carrier can be turned over.
Preferably, a mud scraper is arranged in the high-efficiency sedimentation tank and used for cleaning the sedimented sludge into the thickening tank.
Furthermore, the stainless steel plate is provided with 6I-shaped nails and is fixed in a water pool.
Preferably, a grating hole is reserved on the stainless steel plate; preferably, the two stainless steel plates are determined according to the size of the original aerobic tank.
Further, a carrier, activated sludge and an anchoring agent are added into the A1 anoxic tank, the O1 aerobic tank, the A2 facultative tank and the O2 aerobic tank.
Wherein the volume filling rate of the biological carrier is 10-40%, and the adding volume of the activated sludge is 20-40% of the volume of the reaction tank; the addition amount of the anchoring agent is 0.1-0.2 ppm.
Preferably, the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN 108946933B; more preferably, the volume filling rate of the biological carrier is 10-40%.
Preferably, the anchoring agent is selected from a biological anchoring agent disclosed in CN112707517A, and a preparation method and an application patent product thereof.
Further, the secondary sedimentation tank is transformed into a high-efficiency sedimentation tank.
Preferably, the efficient sedimentation tank is supplemented with preposed biochemical phosphorus removal by a chemical phosphorus removal method with PAC added; more preferably, the PAC mass concentration is 5-10%, and the addition amount is 15-100 mg/L.
Further, a grid net is added from the anoxic tank to the overflow port of the aerobic tank 1; and a grid net is added on the overflow port of the aerobic tank 2 to the high-efficiency sedimentation tank to prevent the carrier from losing.
The invention relates to a sewage treatment station upgrading and reforming treatment system, which comprises the following operation steps:
the method comprises the following steps: removing coarse particles such as silt and the like from the sewage through a grit chamber, and then stably adjusting the pH value to 6-9 through an adjusting tank;
step two: sewage is pretreated by a regulating tank and then pumped into an A1 anoxic tank by a lift pump, and is mixed with a returned nitrifying liquid to carry out phosphorus-accumulating bacteria phosphorus release and ammoniation, facultative acidifying bacteria in sludge decompose macromolecular organic matters in water into lower fatty acid for phosphorus-accumulating bacteria to absorb, and the phosphorus-accumulating bacteria use polyphosphate stored in vivo as PO4 3--the release of the form P in order to obtain energy;
step three: the effluent of the A1 anoxic tank flows into an O1 aerobic tank to carry out nitrification, phosphorus accumulation bacteria phosphorus absorption, COD removal and other series of reactions, ammonia nitrogen and organic nitrogen are converted into nitrate nitrogen by nitrifying bacteria under aerobic conditions through aeration in the tank, phosphorus in the sewage is absorbed, the purposes of removing ammonia nitrogen and total phosphorus are achieved, and meanwhile, partial pollutants in the water are removed;
step four: the effluent of the O1 aerobic pool flows into the A2 facultative tank and is mixed with the sewage flowing in through the shunt inlet pipe, and the nitrite nitrogen and nitrate nitrogen in the sewage are reduced into N2Denitrifying and denitrifying, and hydrolyzing the residual COD difficult to degrade after the treatment in the O1 aerobic tank;
step five: the effluent of the A2 facultative tank flows into the O2 aerobic tank, and the biological filler in the O2 aerobic tank forms an anaerobic-facultative-aerobic microenvironment from inside to outside, so that the COD degradation and denitrification efficiency is improved, the biomass in the system is improved, and the generation amount of residual sludge is reduced; fully aerating to remove residual COD, ammonia nitrogen and total nitrogen in the sewage;
step six: the effluent of the O2 aerobic tank flows into a high-efficiency sedimentation tank, and soluble Phosphate (PO) in the sewage is stirred by adding a flocculating agent PAC and using a chemical phosphorus removal means4 3-) With Al3+Fully react to form AlPO4Precipitating, and discharging supernatant as effluent.
Further, a carrier, activated sludge and an anchoring agent are added into the A1 anoxic tank, the O1 aerobic tank, the A2 facultative tank and the O2 aerobic tank.
Wherein the volume filling rate of the biological carrier is 10-40%, and the adding volume of the activated sludge is 20-40% of the volume of the reaction tank; the addition amount of the anchoring agent is 0.1-0.2 ppm.
Preferably, the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN 108946933B; more preferably, the volume filling rate of the biological carrier is 10-40%.
Preferably, the anchoring agent is selected from a biological anchoring agent disclosed in CN112707517A, and a preparation method and an application patent product thereof.
Further, the treatment system treats water with the volume of 1200 +/-240 m3D; the total retention time of the wastewater in the biochemical treatment system in the biochemical tank is 6.3-9.5h, and the retention time of the wastewater in the high-efficiency sedimentation tank is 1.5-3 h.
Preferably, the hydraulic retention time of the A1 anoxic pond is 0.7-1 h; the hydraulic retention time of the O1 aerobic pool is 2.1-3h, and the DO is controlled to be 3-5 mg/L; the hydraulic retention time of the A2 facultative tank is 0.9-1.4h, and the dissolved oxygen DO is controlled below 0.5 mg/L; the hydraulic retention time of the O2 aerobic zone is 2.7-6.3h, and the dissolved oxygen DO is controlled to be 3-5 mg/L.
Preferably, the residence time of the high-efficiency sedimentation tank comprises PAC flocculation time of 0.5-1h and sedimentation time of 1-2 h.
Has the advantages that: the invention discloses a biochemical tank reconstruction method, which comprises the steps of reconstructing an original aerobic tank into an aerobic tank 1, a facultative tank and an aerobic tank 2, adding a biological carrier, activated sludge and an anchoring agent into the reconstructed biochemical tank, and reconstructing a secondary sedimentation tank into a high-efficiency sedimentation tank. The sewage treatment system after the upgrading and transformation of the invention uses the AOAO process and the high-efficiency precipitation method, and can still realize the high-efficiency carbon removal, nitrogen removal and phosphorus removal of the sewage treatment system on the advantages of low construction cost and low cost operation. The method is suitable for upgrading and modifying the domestic sewage station under the conditions of high requirement on effluent quality, shortage of land, limited expenditure, large water inlet fluctuation and the like.
Drawings
FIG. 1 is a design diagram of a modified forebay type of a sewage treatment plant according to the present invention;
FIG. 2 is a layout of a modified tank of the sewage treatment plant of the present invention;
FIG. 3 is a process flow diagram of the present invention for upgrading a processing system.
Wherein the reference numerals are: 1. a grit chamber; 2. a regulating tank; 3. a hoisting pond; 4. a1 anoxic pond; 5. an O1 aerobic tank; 6. a2 facultative tank; 7. an O2 aerobic tank; 8. a high-efficiency sedimentation tank; 9. a concentration tank; 10. a stirrer; 11. a stainless steel plate; 12. i-shaped nail.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Example 1
As shown in fig. 1-3, a sewage treatment station upgrading and reforming treatment system is formed by the following steps: the method comprises the steps of feeding water → a grit chamber → an adjusting tank → an anoxic chamber → an aerobic chamber → a secondary sedimentation chamber → water discharging, adding two stainless steel plates 11 in an original aerobic chamber, and modifying a biochemical chamber to comprise an A1 anoxic chamber 4+ O1 aerobic chamber 5+ A2 facultative aerobic chamber 6+ O2 aerobic chamber 7, and modifying the secondary sedimentation chamber to a high-efficiency sedimentation chamber 8, and simultaneously adding a water inlet pipeline from a lifting chamber 3 to the A2 facultative aerobic chamber 6.
With reference to fig. 2 and 3, the sewage treatment station upgrading, reforming and treating system comprises a grit chamber 1, an adjusting chamber 2, a lifting chamber 3, a biochemical chamber, a high-efficiency sedimentation chamber 8 and a concentration chamber 9 which are arranged in sequence, wherein the biochemical chamber comprises an A1 anoxic chamber 4, an O1 aerobic chamber 5, an A2 facultative aerobic chamber 6 and an O2 aerobic chamber 7 which are arranged in sequence, a water inlet pipeline is arranged between the lifting chamber 3 and the A2 facultative aerobic chamber 6, and a nitrification liquid return pipeline is arranged between the O2 aerobic chamber 7 and the A1 anoxic chamber 4.
The O1 aerobic pool 5 and the A2 facultative tank 6 are separated by a stainless steel plate 11, and the A2 facultative tank 6 and the O2 aerobic pool 7 are separated by a stainless steel plate 11; the stainless steel plate 11 is fixed by I-shaped nails 12, and the I-shaped nails 12 are fixed in the biochemical tank; a stirrer 10 is arranged in the A2 facultative tank 6, and a mud scraper is arranged in the high-efficiency sedimentation tank 8. Grid holes are reserved on the stainless steel plate 11, and a grid net is added on an overflow port from the A1 anoxic tank 4 to the O1 aerobic tank 5; a grid net is added on the overflow port of the O2 aerobic tank 7 to the high-efficiency sedimentation tank 8.
Example 2
A method for treating sewage by adopting an optimized treatment system of embodiment 1 and an AOAO process integrated efficient precipitation method comprises the following steps:
the method comprises the following steps: the sewage is firstly treated by a grit chamber 1 to remove coarse particles such as silt and the like, and then is treated by an adjusting tank 2 to stably adjust the pH value to 6-9.
Step two: sewage is pretreated by a regulating tank 2 and then is pumped into an A1 anoxic tank 4 by a lifting pump arranged in a lifting tank 3, and is mixed with nitrifying liquid returned by a nitrifying liquid return pipeline, phosphorus release and ammoniation are carried out on phosphorus accumulating bacteria in the A1 anoxic tank 4, facultative acidifying bacteria in sludge decompose macromolecular organic matters in water into low-grade fatty acid for phosphorus accumulating bacteria to absorb, and the phosphorus accumulating bacteria store the inside of the bodyWith PO as polyphosphate4 3-The form of-P is released in order to gain energy.
A1 is added into an anoxic pond 4, a biological carrier, an anchoring agent and activated sludge are added, the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN108946933B, and the volume filling rate of the biological carrier is 10-40%. The anchoring agent is selected from a biological anchoring agent disclosed in CN112707517A, and a preparation method and an application patent product thereof, wherein the addition amount of the anchoring agent is 0.1-0.2 ppm. The adding volume of the activated sludge is 20-40% of the volume of the reaction tank. Step three: the effluent of the A1 anoxic tank 4 flows into the O1 aerobic tank 5, oxygen is provided by the aeration fan, nitrifying bacteria convert ammonia nitrogen and organic nitrogen into nitrate nitrogen under aerobic conditions, phosphorus in the sewage is absorbed, the purposes of removing ammonia nitrogen and total phosphorus are achieved, and meanwhile, partial pollutants in the water are removed.
Adding biological carriers, biological anchoring agents and activated sludge into the O1 aerobic tank 5. Wherein the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN108946933B, and the volume filling rate of the biological carrier is 10-40%. The anchoring agent is selected from a biological anchoring agent disclosed in CN112707517A, and a preparation method and an application patent product thereof, wherein the addition amount of the anchoring agent is 0.1-0.2 ppm. The adding volume of the activated sludge is 20-40% of the volume of the reaction tank.
Step four: the effluent of the O1 aerobic tank 5 flows into the A2 facultative tank 6, the wastewater and the biological filler are uniformly mixed by the stirrer 10, and the nitrite nitrogen and the nitrate nitrogen in the wastewater are reduced into N2Denitrifying and denitrifying, and hydrolyzing the residual COD difficult to degrade after the treatment in the O1 aerobic pool 5;
biological carriers, biological anchoring agents and activated sludge are added into the A2 facultative tank 6. Wherein the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN108946933B, and the volume filling rate of the biological carrier is 10-40%. The anchoring agent is selected from CN112707517A, and the preparation method and the application patent product thereof are disclosed, wherein the addition amount of the anchoring agent is 0.1-0.2 ppm, and the addition volume of the activated sludge is 20-40% of the volume of the reaction tank.
Step five: the effluent of the A2 facultative tank 6 flows into the O2 aerobic tank 7, oxygen is provided by the aeration fan, and the biological filler in the O2 aerobic tank 7 forms an anaerobic-facultative-aerobic microenvironment from inside to outside, so that the COD degradation and denitrification efficiency is improved, the biomass in the system is improved, and the generation amount of residual sludge is reduced; fully aerating to remove residual COD, ammonia nitrogen and total nitrogen in the sewage;
adding biological carriers, biological anchoring agents and activated sludge into the O2 aerobic tank 7. Wherein the carrier is a modified polyethylene microbial carrier filler patent product disclosed in CN108946933B, and the volume filling rate of the biological carrier is 10-40%. The anchoring agent is selected from a biological anchoring agent disclosed in CN112707517A, and a preparation method and an application patent product thereof, wherein the addition amount of the anchoring agent is 0.1-0.2 ppm. The adding volume of the activated sludge is 20-40% of the volume of the reaction tank.
Step six: and (3) enabling effluent of the O2 aerobic tank 7 to flow into a high-efficiency sedimentation tank 8, adding a flocculating agent PAC by using a chemical phosphorus removal method, and stirring again, wherein the PAC mass concentration is 5-10%, and the adding amount is 15-100 mg/L. Make soluble Phosphate (PO) in sewage4 3-) With Al3+Fully react to form AlPO4Precipitating, and discharging supernatant as effluent.
Application example 1
1200m for sewage treatment scale3And d, performing limit standard of discharge standard of main water pollutants of urban sewage treatment plants (DB 33/2169-2018) on effluent. The treatment system of example 1 and the treatment method of example 2 were used for wastewater treatment.
Table 1 designs the quality of inlet and outlet water
The design residence time of the 4A1 anoxic tank is 0.8h, and the size is 40m3。
The designed retention time of the 5O1 aerobic pool is 2.4h, the dissolved oxygen DO is controlled to be 3-5mg/L, and the size is 113m3。
The designed residence time of the 6A2 facultative tank is 1.1h, the dissolved oxygen DO is controlled below 0.5mg/L, and the size is 113m3。
The designed retention time of the 7O2 aerobic pool is 3.3h, the dissolved oxygen DO is controlled to be 3-5mg/L, and the size is 113m3。
8 the high-efficiency sedimentation tank adopts honeycomb inclined tube type sedimentation, the average ascending flow velocity is 11.6m/h, the designed retention time is 3h, and the size is 11.7 multiplied by 2.6 multiplied by 5.5m3。
The project of upgrading and reconstruction only adds 1 water inlet lift pump, 1 submersible mixer and 1 mud scraper, and the power consumption per ton is 0.423kWh/m3The cost of the medicine per ton of water is 0.168 yuan/m3。
TABLE 2 Water quality and treatment effect of inlet and outlet water of sewage treatment station before reconstruction
TABLE 3 Water quality test results of the transformed system
As shown in tables 2 and 3, the COD and NH of the wastewater according to the present invention3Indexes such as-N, TP and TN have good removal effects, the removal rates corresponding to the indexes are respectively 75%, 97%, 94% and 68%, and the four indexes are all lower than the limit standard of discharge standard of main water pollutants of urban sewage treatment plants (DB 33/2169-2018), so that the standard improvement and transformation requirements are met.
The technical features of the present invention which are not described in the above embodiments may be implemented by or using the prior art, and are not described herein again, of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions or substitutions which may be made by those skilled in the art within the spirit and scope of the present invention should also fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a sewage treatment station carries mark transformation processing system, its characterized in that, including grit chamber (1), equalizing basin (2), lifting pool (3), biochemical pond and high-efficient sedimentation tank (8) that set gradually, wherein, biochemical pond is including A1 oxygen deficiency pond (4), O1 good oxygen pond (5), A2 facultative anaerobic pond (6) and O2 good oxygen pond (7) that set gradually, be equipped with the inlet channel between lifting pool (3) to A2 facultative anaerobic pond (6).
2. The sewage treatment station upgrading reforming treatment system according to claim 1, wherein a nitrified liquid return line is arranged between the O2 aerobic tank (7) and the A1 anoxic tank (4), and a concentration tank (9) is arranged behind the high-efficiency sedimentation tank (8).
3. The sewage treatment station upgrading system according to claim 1, wherein an agitator (10) is arranged in the A2 facultative tank (6), and a mud scraper is arranged in the high-efficiency sedimentation tank (8).
4. The sewage treatment station upgrading system according to claim 1, wherein the O1 aerobic tank (5) and the A2 facultative tank (6), the A2 facultative tank (6) and the O2 aerobic tank (7) are separated by a stainless steel plate (11), the stainless steel plate (11) is fixed by an I-shaped nail (12), and the I-shaped nail (12) is fixed in a biochemical tank.
5. A method of treating wastewater using the improved wastewater treatment system of any of claims 1-4, comprising the steps of:
the method comprises the following steps: removing coarse particles such as silt and the like from the sewage through a grit chamber, and then stably adjusting the pH value to 6-9 through an adjusting tank;
step two: the sewage is pretreated by a regulating tank and then enters an A1 anoxic tank through a lifting tank to carry out phosphorus release and ammoniation of phosphorus accumulating bacteria;
step three: the effluent of the A1 anoxic tank flows into an O1 aerobic tank to carry out nitration, phosphorus absorption by phosphorus accumulating bacteria and COD removal reaction;
step four: the effluent of the O1 aerobic pool flows into the A2 facultative tank,nitrite nitrogen and nitrate nitrogen in waste water are reduced into N2Denitrifying and denitrifying, and hydrolyzing the residual COD difficult to degrade after the treatment in the O1 aerobic tank;
step five: the effluent of the A2 facultative tank flows into an O2 aerobic tank, and a biological filler in the O2 aerobic tank forms an anaerobic-facultative-aerobic microenvironment from inside to outside, so that the aeration is performed fully, and the residual COD, ammonia nitrogen and total nitrogen in the sewage are removed;
step six: the effluent of the O2 aerobic tank flows into a high-efficiency sedimentation tank, and soluble phosphate PO in the sewage is stirred by adding a flocculating agent PAC and using a chemical phosphorus removal means4 3-With Al3+Fully react to form AlPO4The sediment is discharged by a sludge discharge means.
6. The wastewater treatment method according to claim 5, wherein the anoxic tank A1, the aerobic tank O1, the facultative tank A2 and the aerobic tank O2 are added with carriers, activated sludge and anchoring agent; wherein the volume filling rate of the biological carrier is 10-40%, and the adding volume of the activated sludge is 20-40% of the volume of the reaction tank; the addition amount of the anchoring agent is 0.1-0.2 ppm.
7. The wastewater treatment method according to claim 5, wherein the efficient sedimentation tank is supplemented with chemical phosphorus removal method added with PAC to carry out preposed biochemical phosphorus removal; more preferably, the PAC mass concentration is 5-10%, and the addition amount is 15-100 mg/L.
8. The wastewater treatment method according to claim 5, wherein the treatment system treats water with a volume of 1200 ± 240m3D; the total retention time of the wastewater in the biochemical tank is 6.3-9.5h, and the retention time of the wastewater in the high-efficiency sedimentation tank is 1.5-3 h.
9. The wastewater treatment method according to claim 5, wherein the hydraulic retention time of the anoxic tank A1 is 0.7-1 h; the hydraulic retention time of the O1 aerobic pool is 2.1-3h, and the DO is controlled to be 3-5 mg/L; the hydraulic retention time of the A2 facultative tank is 0.9-1.4h, and the dissolved oxygen DO is controlled below 0.5 mg/L; the hydraulic retention time of the O2 aerobic zone is 2.7-6.3h, and the dissolved oxygen DO is controlled to be 3-5 mg/L.
10. The wastewater treatment method according to claim 5, wherein the high efficiency settling tank residence time comprises a PAC flocculation time of 0.5-1h and a settling time of 1-2 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114436465A (en) * | 2021-12-22 | 2022-05-06 | 浙江省环保集团象山有限公司 | Novel urban and rural sewage treatment device |
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