CN115745161B - Device and method for modifying urban sewage denitrification traditional process based on suspended sludge into pure biological membrane PDA denitrification process - Google Patents
Device and method for modifying urban sewage denitrification traditional process based on suspended sludge into pure biological membrane PDA denitrification process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 71
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- 239000010865 sewage Substances 0.000 title claims abstract description 35
- 239000012528 membrane Substances 0.000 title claims abstract description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000004062 sedimentation Methods 0.000 claims description 26
- 238000010992 reflux Methods 0.000 claims description 24
- 238000005273 aeration Methods 0.000 claims description 23
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- 239000007788 liquid Substances 0.000 claims description 13
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- 230000014759 maintenance of location Effects 0.000 claims description 4
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- 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 3
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
A device and a method for reforming a traditional urban sewage denitrification process based on suspended sludge into a pure biological membrane PDA denitrification process belong to the technical field of sewage treatment by an activated sludge method. The problems of low effective treatment rate of residual sludge and serious secondary pollution in the treatment process, which are caused by the discharge of a large amount of residual sludge, of the traditional urban sewage treatment process are needed to be solved. Anaerobic ammonia oxidizing bacteria have obvious ecological niche preference for attachment growth, and anaerobic ammonia oxidizing bacteria are enriched in a biological film by adding a biological film carrier into an anaerobic zone and splicing sludge in parallel in an anaerobic zone of an AAO-BCO process; the biomass of denitrifying bacteria in the anaerobic and anoxic areas is reduced by reducing the concentration of the suspended sludge in a gradient manner, so that the competition of denitrification for nitrite nitrogen is weakened, the competition of anaerobic ammonia oxidizing bacteria for nitrite nitrogen is relatively improved, and the anaerobic ammonia oxidizing bacteria can be enhanced and enriched in biological membranes along with the reduction of the concentration of the suspended sludge. The invention provides a scheme for economic, efficient and sustainable upgrading and reconstruction of the urban sewage plant.
Description
Technical field:
The invention relates to a device and a method for modifying a traditional urban sewage denitrification process based on suspended sludge into a pure biological membrane PDA denitrification process, belonging to the field of sewage biological treatment. The method is suitable for the upgrading and reconstruction process of the urban sewage treatment plant.
The background technology is as follows:
With the acceleration of the urban process in China, the urban sewage treatment capacity is gradually increased year by year. The urban sewage biological treatment based on the activated sludge method is the most economical and effective way for denitrification and carbon removal at present, and is a basic method for solving the problem of water eutrophication and protecting water environment. The traditional biological treatment process based on suspended sludge, such as A/O, AAO, CAST, oxidation ditch and the like, is adopted by most urban sewage treatment plants in China, the operation of the traditional process is often accompanied by the discharge of a large amount of residual sludge, the treatment cost of the residual sludge is extremely high, the effective treatment rate is relatively low, a large amount of energy is consumed, and serious secondary pollution is caused while a large amount of additional carbon dioxide is discharged, so that the method is contrary to the 'double carbon' prospect of low carbon emission reduction and greenhouse effect restoration in China. The current status of sludge disposal emphasizes: the urban sewage treatment plant is imperative to upgrade and reform from the operation mode of suspended sludge to the operation mode of biological membranes. If the urban sewage treatment plant can get rid of the dependence on suspended sludge, the biomass in the biological film is utilized to complete the denitrification process, the output of the residual sludge can be reduced by more than 95%, and the problems of corresponding energy consumption, environmental pollution and the like caused by sludge disposal are thoroughly solved.
Anaerobic ammoxidation (Anamox) is used as a leading-edge biotechnology, and opens up a new path for sustainable denitrification of urban sewage. Unlike traditional processes that rely on nitrification-denitrification, anaerobic ammonia oxidizing bacteria, a unique autotrophic microorganism, can utilize nitrite nitrogen as an electron acceptor to directly oxidize ammonia nitrogen to nitrogen, thereby significantly reducing operating cost and carbon footprint. Currently, high ammonia nitrogen sewage treatment systems based on anaerobic ammonia oxidation technology are increasingly popularized worldwide. However, in view of the sensitivity of anammox bacteria and the complex microbial competition in low ammonia nitrogen wastewater (e.g., nitrite nitrogen oxidizing bacteria compete with anammox bacteria for substrate nitrite nitrogen), anaerobic ammonia oxidation technology in municipal wastewater remains a bottleneck, wherein a key issue is how to ensure that anammox can continuously obtain substrate nitrite nitrogen in the main stream of municipal wastewater.
Short-cut denitrification has been proposed in recent years as a way to provide substrate nitrite nitrogen for anaerobic ammonia oxidation in both the anaerobic zone and the anoxic zone, thereby "bypassing" the competition of nitrite nitrogen oxidizing bacteria in the aerobic zone with anaerobic ammonia oxidizing bacteria for substrate nitrite nitrogen. Specifically, nitrite nitrogen can be obtained by reducing nitrate nitrogen by denitrifying bacteria, and the reduction process of nitrite nitrogen by denitrifying bacteria can be inhibited by a certain control method (for example, supplementing organic carbon which is easy to biodegrade and controlling the lower concentration ratio of Chemical Oxygen Demand (COD) to nitrate nitrogen), so that accumulation of nitrite nitrogen is formed, and a reaction substrate is provided for anaerobic ammoxidation. The process of completing denitrification by cooperation of denitrifying bacteria and anaerobic ammonia oxidizing bacteria is called short-cut denitrification coupling anaerobic ammonia oxidation (PDA). However, the industrial scale implementation of PDAs in municipal sewage plants (WWTP) is not a simple problem, and the technical bottleneck mainly exists in two points: 1) Anaerobic ammonia oxidizing bacteria biomass in the main stream of the urban sewage treatment plant is often low; 2) Anaerobic and anoxic zones of most municipal sewage plants do not have the above-described operating conditions that favor the formation of nitrite nitrogen accumulation.
In order to solve the problem of low biomass of anaerobic ammonium oxidation bacteria, carrier biofilms have been proposed and validated to provide attachment conditions for biomass retention and enrichment for slow growing anaerobic ammonium oxidation bacteria, and thus, mixed biomass operation modes of suspended sludge in anaerobic and anoxic zones in combination with biofilms have been widely recommended. Notably, ecological head abnormalities of denitrifying bacteria and anammox bacteria are often found in this type of mixed biomass mode of operation: considering the niche preference for the adherent growth of anaerobic ammonia oxidizing bacteria, the vast majority of anaerobic ammonia oxidizing biomass remains in the biofilm; in the case of denitrifying bacteria, mass transfer resistance in the biofilm affects its substrate uptake, so that denitrifying bacteria are more enriched in suspended sludge. Studies have shown that denitrifying bacteria in suspended sludge compete with anammox bacteria in biological membranes for the common substrate nitrite nitrogen, i.e. denitrifying bacteria on the one hand are able to reduce nitrate nitrogen to nitrite nitrogen and on the other hand reduce most of nitrite nitrogen further to nitrogen. In this sense, denitrifying bacteria in the suspended sludge have a significant competition relationship with anammox bacteria in the biofilm, and this competition relationship can significantly affect the substrate acquisition process of anammox and inhibit PDA process. Therefore, it is proposed to reduce the concentration of suspended sludge so as to reduce the biomass of denitrifying bacteria in the system, and finally achieve the purpose of weakening the competitiveness of denitrification to nitrite nitrogen, so that anaerobic ammoxidation obtains higher proportion of nitrite nitrogen. The feasibility of this approach has been demonstrated, i.e., anaerobic ammoxidation in a biofilm is progressively enriched and enhanced during the reduction of suspended sludge concentration. In fact, if the suspended sludge is eventually completely discharged from the system and a pure biofilm mode of operation is established, the enriched and enhanced anaerobic ammonia oxidation has great potential to become the dominant denitrification pathway in pure biofilm systems.
Based on the background, the present document proposes to gradient decrease the concentration of suspended sludge to strengthen the abundance of anaerobic ammonia oxidizing bacteria and the denitrification contribution rate in the biological film, and finally to discharge the suspended sludge out of the system, and to construct the denitrification process dominated by PDA in the pure biological film system. It is worth noting that, in order to ensure that the nitrification process is not affected during the process of reducing the suspended sludge concentration in the anaerobic, anoxic zone, it is suggested herein that a separate sludge system should be built for the nitrification process. The AAO-BCO (anaerobic-anoxic-aerobic series biological contact oxidation) process is an ideal process carrier for realizing the upgrading and reforming processes mentioned above. Firstly, after a BCO (biological contact oxidation) unit is connected in series with a secondary sedimentation tank and an AAO (anaerobic-anoxic-aerobic) unit, suspended sludge is isolated outside the BCO unit, and the whole nitrification process is completed by a carrier biological film in the BCO unit, so that the performance of the BCO unit is not affected by the concentration change of the suspended sludge in an anaerobic zone and an anoxic zone. In addition, the effective volume ratio of the anaerobic and anoxic areas in the AAO-BCO process is often more than 60 percent, which is far higher than that of the traditional AAO process, and the method compensates for relatively less biomass and relatively slower denitrification rate in a pure biological film system. In summary, strategies are presented herein based on the AAO-BCO process to gradient the suspended sludge concentration in the AAO units to enhance anaerobic ammonium oxidation bacteria abundance and denitrification contribution in the biofilm, ultimately discharging the suspended sludge entirely out of the AAO units and forming a pure biofilm-based PDA denitrification process. The method provides a brand new technical scheme for economic, efficient and sustainable upgrading and reconstruction of the urban sewage plant.
The invention comprises the following steps:
The method for reforming the urban sewage denitrification traditional process based on the suspended sludge into the pure biological membrane PDA denitrification process comprises the following steps of: urban sewage in the raw water tank (1) is pumped into an anaerobic-anoxic-aerobic (AAO) biochemical reaction zone by a water inlet pump (2) through a water inlet pipeline (14), and the water inlet pipeline is provided with a check valve (3); raw water firstly enters an anaerobic zone (4), and then flows through a first anoxic zone (6), a second anoxic zone (7), a third anoxic zone (8), a fourth anoxic zone (9) and an aeration zone (aerobic zone) (10) in sequence; adding a biological film carrier into the anaerobic zone and the anoxic zone and being provided with a submersible stirrer (5); an aeration device (22) is arranged in the aerobic zone (10), the aeration device is connected with an aeration pipeline (24), a rotor flowmeter and an air valve (23), and aeration power is provided by an air compressor (31); the overflow weir of the AAO biochemical reaction zone is arranged in the aerobic zone, and effluent enters the secondary sedimentation tank (12) from the overflow weir through the secondary sedimentation tank water inlet pipe (11) and the secondary sedimentation tank central pipe (25); the residual sludge at the bottom of the secondary sedimentation tank is pumped into an anaerobic zone by a sludge reflux pump (20) through a sludge reflux pipeline (16), the sludge reflux ratio is 100%, and the sludge reflux pipeline is provided with a valve (15), a flowmeter and a check valve; a mud discharge pipeline (26) is arranged on the secondary sedimentation tank; supernatant in the secondary sedimentation tank enters a secondary sedimentation tank water outlet pipe, and all effluent of the secondary sedimentation tank is pumped into a Biological Contact Oxidation (BCO) biochemical reaction zone (13) through a lifting pump (27); a biological film carrier is added into a BCO biochemical reaction zone and a BCO aeration device (28) is arranged, the BCO aeration device is connected with a BCO aeration pipeline (23), a rotor flowmeter (29) and an air valve, and aeration power is provided by an air compressor; the effluent of the BCO biochemical reaction zone is pumped into the first anoxic zone by a nitrifying liquid reflux pump (21) through a nitrifying liquid reflux pipeline (18), the nitrifying liquid reflux ratio is 200-400%, and the nitrifying liquid reflux pipeline is provided with a valve, a flowmeter (17) and a check valve (19); effluent at the tail end of the BCO biochemical reaction zone is discharged out of the system through an overflow weir and a water outlet pipe (30).
The method for reforming the urban sewage denitrification traditional process based on the suspended sludge into the pure biological membrane PDA denitrification process is characterized by comprising the following steps:
1) The upgrading and reforming process is completed in an AAO-BCO (anaerobic-anoxic-aerobic series biological contact oxidation) process.
2) And (3) adding a biomembrane carrier with a filling ratio of 30% -50% and a specific surface area of 400-500m 2/m3 into an anaerobic zone and an anoxic zone of the AAO biochemical reaction zone, and simultaneously adding anaerobic ammonia oxidation seed mud into the AAO biochemical reaction zone.
3) After the biomembrane carrier and the seed sludge are added into the AAO biochemical reaction zone, the suspended sludge concentration is kept to 4500-3500mg VSS/L, the stable operation is carried out for 3-4 months, and then the gradient reduction of the suspended sludge concentration is carried out. Reducing the suspended sludge concentration to 3500-2500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; reducing the suspended sludge concentration to 2500-1500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; reducing the suspended sludge concentration to below 1500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; finally, the suspended sludge is completely discharged out of the AAO biochemical reaction zone.
4) The nitrification process is completed in the BCO biochemical reaction area, wherein a biomembrane carrier with a nitrifying function, a filling ratio of 40% -60% and a specific surface area of 400-500m 2/m3 is added. The BCO biochemical reaction zone is connected in series behind the AAO biochemical reaction zone and the secondary sedimentation tank, the supernatant fluid of the secondary sedimentation tank enters the BCO biochemical reaction zone, and suspended sludge is isolated outside the BCO biochemical reaction zone.
5) When the device is operated at a suspended sludge concentration of 4500-3500mg VSS/L, the total effective Hydraulic Retention Time (HRT) is maintained for 12-15 hours; when the suspended sludge concentration is reduced to 2500-1500mg VSS/L, the total effective HRT is prolonged by 20% in a mode of reducing the water inflow by 20%; when the suspended sludge is completely discharged out of the system, the inflow water flow is reduced by 20% again on the basis of the existing flow.
The method for reforming the urban sewage denitrification traditional process based on the suspended sludge into the pure biological membrane PDA denitrification process comprises the following steps:
Adding suspended sludge in the urban sewage treatment plant into the AAO biochemical reaction zone to serve as suspended sludge seed sludge, and keeping the initial suspended sludge concentration in the AAO biochemical reaction zone to be 4500-3500mg VSS/L; the method comprises the steps of (1) according to claim 3, adding anaerobic ammonia oxidation seed sludge and a biomembrane carrier with a filling ratio of 30% -50% and a specific surface area of 400-500m 2/m3 into an anaerobic zone and an anoxic zone; the method comprises the steps of (1) adding a biomembrane carrier with a nitrifying function, which has a filling ratio of 40% -60% and a specific surface area of 400-500m 2/m3, to a BCO biochemical reaction zone according to claim 5; the gradient of claim 4, wherein the concentration of suspended sludge in the AAO biochemical reaction zone is reduced until suspended sludge is completely discharged from the system; during the whole operation period, the reflux ratio of the sludge is 100 percent, and the reflux ratio of the nitrifying liquid is 200-400 percent; controlling Dissolved Oxygen (DO) in an aerobic zone of the AAO biochemical reaction zone to be 0.5-1.0mg/L; controlling Dissolved Oxygen (DO) of the BCO biochemical reaction zone to be 1.0-3.0mg/L; the biological film carriers in the anaerobic zone and the anoxic zone are uniformly mixed and fully contacted with sewage by controlling the speed of diving and stirring to be 80-100 revolutions per minute.
In summary, strategies are presented herein based on the AAO-BCO process to gradient the suspended sludge concentration in the AAO units to enhance anaerobic ammonium oxidation bacteria abundance and denitrification contribution in the biofilm, ultimately discharging the suspended sludge entirely out of the AAO units and forming a pure biofilm-based PDA denitrification process. The method provides a brand new technical scheme for economic, efficient and sustainable upgrading and reconstruction of the urban sewage plant.
Description of the drawings:
FIG. 1 is a schematic diagram of an apparatus and method for implementing deep denitrification of municipal sewage in PDA-MBBR using excess sludge fermentation supernatant.
In fig. 1: 1-a raw water tank; 2-a water inlet pump; 3-check valve; 4-anaerobic zone; 5-a submersible mixer; 6-a first anoxic zone; 7-a second anoxic zone; 8-a third anoxic zone; 9-a fourth anoxic zone; 10-an aeration zone (aerobic zone); 11-a secondary sedimentation tank water inlet pipe; 12-a secondary sedimentation tank; 13-Biological Contact Oxidation (BCO) biochemical reaction zone; 14-a water inlet pipeline; 15-valve; 16-a sludge return pipeline; 17-a flow meter; 18-nitrifying liquid return pipeline; 19-check valve; 20-a sludge reflux pump; 21-a nitrifying liquid reflux pump; 22-an aeration device; 23-air valve; 24-an aeration pipeline; 25-a secondary sedimentation tank central tube; 26-a sludge discharge pipeline; 27-a lift pump; a 28-BCO aeration device; 29-rotameter; 30-a water outlet pipe; 31-an air compressor; .
Detailed Description
Referring to fig. 1, an embodiment of the present invention will be specifically described:
1) The upgrading and reforming process is completed in an AAO-BCO (anaerobic-anoxic-aerobic series biological contact oxidation) process.
2) And (3) adding a biomembrane carrier with a filling ratio of 30% -50% and a specific surface area of 400-500m 2/m3 into an anaerobic zone and an anoxic zone of the AAO biochemical reaction zone, and simultaneously adding anaerobic ammonia oxidation seed mud into the AAO biochemical reaction zone.
3) After the biomembrane carrier and the seed sludge are added into the AAO biochemical reaction zone, the suspended sludge concentration is kept to 4500-3500mg VSS/L, the stable operation is carried out for 3-4 months, and then the gradient reduction of the suspended sludge concentration is carried out. Reducing the suspended sludge concentration to 3500-2500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; reducing the suspended sludge concentration to 2500-1500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; reducing the suspended sludge concentration to below 1500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; finally, the suspended sludge is completely discharged out of the AAO biochemical reaction zone.
4) The nitrification process is completed in the BCO biochemical reaction area, wherein a biomembrane carrier with a nitrifying function, a filling ratio of 40% -60% and a specific surface area of 400-500m 2/m3 is added. The BCO biochemical reaction zone is connected in series behind the AAO biochemical reaction zone and the secondary sedimentation tank, the supernatant fluid of the secondary sedimentation tank enters the BCO biochemical reaction zone, and suspended sludge is isolated outside the BCO biochemical reaction zone.
5) When the device is operated at a suspended sludge concentration of 4500-3500mg VSS/L, the total effective Hydraulic Retention Time (HRT) is maintained for 12-15 hours; when the suspended sludge concentration is reduced to 2500-1500mg VSS/L, the total effective HRT is prolonged by 20% in a mode of reducing the water inflow by 20%; when the suspended sludge is completely discharged out of the system, the inflow water flow is reduced by 20% again on the basis of the existing flow.
The method comprises the following specific steps:
Adding suspended sludge in the urban sewage treatment plant into the AAO biochemical reaction zone to serve as suspended sludge seed sludge, and keeping the initial suspended sludge concentration in the AAO biochemical reaction zone to be 4500-3500mg VSS/L; the method comprises the steps of (1) according to claim 3, adding anaerobic ammonia oxidation seed sludge and a biomembrane carrier with a filling ratio of 30% -50% and a specific surface area of 400-500m 2/m3 into an anaerobic zone and an anoxic zone; the method comprises the steps of (1) adding a biomembrane carrier with a nitrifying function, which has a filling ratio of 40% -60% and a specific surface area of 400-500m 2/m3, to a BCO biochemical reaction zone according to claim 5; the gradient of claim 4, wherein the concentration of suspended sludge in the AAO biochemical reaction zone is reduced until suspended sludge is completely discharged from the system; during the whole operation period, the reflux ratio of the sludge is 100 percent, and the reflux ratio of the nitrifying liquid is 200-400 percent; controlling Dissolved Oxygen (DO) in an aerobic zone of the AAO biochemical reaction zone to be 0.5-1.0mg/L; controlling Dissolved Oxygen (DO) of the BCO biochemical reaction zone to be 1.0-3.0mg/L; the biological film carriers in the anaerobic zone and the anoxic zone are uniformly mixed and fully contacted with sewage by controlling the speed of diving and stirring to be 80-100 revolutions per minute.
Claims (1)
1. The method for reforming the urban sewage denitrification traditional process based on the suspended sludge into the pure biological membrane PDA denitrification process is characterized by applying the following devices: urban sewage in the raw water tank (1) is pumped into an AAO biochemical reaction zone by a water inlet pump (2) through a water inlet pipeline (14), and the water inlet pipeline is provided with a check valve; raw water firstly enters an anaerobic zone (4), and then sequentially flows through a first anoxic zone (6), a second anoxic zone (7), a third anoxic zone (8), a fourth anoxic zone (9) and an aeration zone (10); adding a biological film carrier into the anaerobic zone and the anoxic zone and being provided with a submersible stirrer (5); an aeration device (22) is arranged in the aeration zone (10), the aeration device is connected with an aeration pipeline (24), a rotor flowmeter and an air valve, and aeration power is provided by an air compressor (31); the overflow weir of the AAO biochemical reaction zone is arranged in the aerobic zone, and effluent enters the secondary sedimentation tank (12) from the overflow weir through the secondary sedimentation tank water inlet pipe (11) and the secondary sedimentation tank central pipe (25); the residual sludge at the bottom of the secondary sedimentation tank is pumped into an anaerobic zone by a sludge reflux pump (20) through a sludge reflux pipeline (16), the sludge reflux ratio is 100%, and the sludge reflux pipeline is provided with a valve (15), a flowmeter and a check valve; a mud discharge pipeline (26) is arranged on the secondary sedimentation tank; supernatant in the secondary sedimentation tank enters a secondary sedimentation tank water outlet pipe, and all effluent of the secondary sedimentation tank is pumped into a BCO biochemical reaction zone (13) through a lifting pump (27); a biological film carrier is added into a BCO biochemical reaction zone and a BCO aeration device (28) is arranged, the BCO aeration device is connected with a BCO aeration pipeline, a rotor flowmeter (29) and an air valve, and aeration power is provided by an air compressor; the effluent of the BCO biochemical reaction zone is pumped into the first anoxic zone by a nitrifying liquid reflux pump (21) through a nitrifying liquid reflux pipeline (18), the nitrifying liquid reflux ratio is 200-400%, and the nitrifying liquid reflux pipeline is provided with a valve, a flowmeter (17) and a check valve; effluent at the tail end of the BCO biochemical reaction zone is discharged out of the system through an overflow weir and a water outlet pipe (30);
Adding suspended sludge in the municipal sewage treatment plant into the AAO biochemical reaction zone to serve as suspended sludge seed sludge, and keeping the initial suspended sludge concentration in the AAO biochemical reaction zone to be 3500-4500 mg VSS/L; adding a biomembrane carrier with anaerobic ammoxidation seed sludge filling ratio of 30% -50% and specific surface area of 400-500m 2/m3 into an anaerobic zone and an anoxic zone; adding a biomembrane carrier with a filling ratio of 40% -60% and a specific surface area of 400-500m 2/m3 and a nitrification function into a BCO biochemical reaction area; gradient reducing the concentration of suspended sludge in the AAO biochemical reaction zone until the suspended sludge is completely discharged out of the system; the BCO biochemical reaction zone is connected in series behind the AAO biochemical reaction zone and the secondary sedimentation tank, the supernatant fluid of the water discharged from the secondary sedimentation tank enters the BCO biochemical reaction zone, the suspended sludge is isolated outside the BCO biochemical reaction zone, the sludge reflux ratio is 100% and the nitrifying liquid reflux ratio is 200% -400% in the whole operation period; controlling the dissolved oxygen of the aerobic zone of the AAO biochemical reaction zone to be 0.5-1.0mg/L, and controlling the dissolved oxygen of the BCO biochemical reaction zone to be 1.0-3.0mg/L; uniformly mixing the biomembrane carriers in the anaerobic zone and the anoxic zone by controlling the speed of diving stirring to be 80-100 revolutions per minute, and fully contacting with sewage;
After a biological membrane carrier and seed sludge are added into an AAO biochemical reaction zone based on suspended sewage, the suspended sludge is kept to be 4500-3500mg VSS/L and stably operated for 3-4 months, and then the gradient reduction of the suspended sludge concentration is carried out; reducing the suspended sludge concentration to 3500-2500mgVSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; reducing the suspended sludge concentration to 2500-1500mg VSS/L by controlling the discharge amount of the residual sludge and stably operating for 3-4 months; the suspended sludge concentration is reduced to below 1500mg VSS/L by controlling the discharge amount of the residual sludge and the suspended sludge stably runs for 3 to 4 months; finally, discharging all suspended sludge out of the AAO biochemical reaction zone;
when the device is operated at the suspended sludge concentration of 4500-3500 mg VSS/L, the total effective hydraulic retention time is kept between 12 and 15 hours; when the suspended sludge concentration is reduced to 2500-1500 mg VSS/L, the total effective HRT is prolonged by 20% in a mode of reducing the water inflow by 20%; when the suspended sludge is completely discharged out of the system, the inflow water flow is reduced by 20% again on the basis of the existing flow.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211381026.6A CN115745161B (en) | 2022-11-05 | 2022-11-05 | Device and method for modifying urban sewage denitrification traditional process based on suspended sludge into pure biological membrane PDA denitrification process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758866A (en) * | 2017-12-01 | 2018-03-06 | 扬州市洁源排水有限公司 | One kind realizes AAO BCO technique deep denitrifications dephosphorization and resource recovering system and method |
| CN108675450A (en) * | 2018-05-07 | 2018-10-19 | 北京工业大学 | A kind of device and method for realizing municipal sewage efficient low-consume denitrogenation dephosphorizing |
| CN110117070A (en) * | 2018-02-05 | 2019-08-13 | 许泽宇 | Energy-efficient compact compound A2/ O dephosphorization denitrogenation processing system and treatment process |
| CN110818070A (en) * | 2019-10-16 | 2020-02-21 | 北京工业大学 | Two-stage A/O partial short-range series fixed bed multistage A/O autotrophic nitrogen removal device and method |
| CN113697953A (en) * | 2021-08-11 | 2021-11-26 | 北京工业大学 | Realization of A based on gradual reduction of suspended sludge concentration2Device and method for quickly starting anaerobic ammonium oxidation process in situ of/O part |
| WO2022121321A1 (en) * | 2020-12-12 | 2022-06-16 | 北京工业大学 | Method for enhancing nitrogen and phosphorus removal by combining multi-stage ao short-range denitrification coupling anammox process with sludge hydrolytic acidification |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758866A (en) * | 2017-12-01 | 2018-03-06 | 扬州市洁源排水有限公司 | One kind realizes AAO BCO technique deep denitrifications dephosphorization and resource recovering system and method |
| CN110117070A (en) * | 2018-02-05 | 2019-08-13 | 许泽宇 | Energy-efficient compact compound A2/ O dephosphorization denitrogenation processing system and treatment process |
| CN108675450A (en) * | 2018-05-07 | 2018-10-19 | 北京工业大学 | A kind of device and method for realizing municipal sewage efficient low-consume denitrogenation dephosphorizing |
| CN110818070A (en) * | 2019-10-16 | 2020-02-21 | 北京工业大学 | Two-stage A/O partial short-range series fixed bed multistage A/O autotrophic nitrogen removal device and method |
| WO2022121321A1 (en) * | 2020-12-12 | 2022-06-16 | 北京工业大学 | Method for enhancing nitrogen and phosphorus removal by combining multi-stage ao short-range denitrification coupling anammox process with sludge hydrolytic acidification |
| CN113697953A (en) * | 2021-08-11 | 2021-11-26 | 北京工业大学 | Realization of A based on gradual reduction of suspended sludge concentration2Device and method for quickly starting anaerobic ammonium oxidation process in situ of/O part |
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