CN115259375B - Device and method for enhancing anaerobic ammoxidation and denitrification dephosphorization by sectional water inflow through AOA process - Google Patents
Device and method for enhancing anaerobic ammoxidation and denitrification dephosphorization by sectional water inflow through AOA process Download PDFInfo
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- CN115259375B CN115259375B CN202210896838.8A CN202210896838A CN115259375B CN 115259375 B CN115259375 B CN 115259375B CN 202210896838 A CN202210896838 A CN 202210896838A CN 115259375 B CN115259375 B CN 115259375B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 181
- 229910001868 water Inorganic materials 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000002708 enhancing effect Effects 0.000 title description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 50
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 47
- 239000011574 phosphorus Substances 0.000 claims abstract description 47
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000010865 sewage Substances 0.000 claims abstract description 39
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 21
- 241000894006 Bacteria Species 0.000 claims abstract description 16
- 238000011217 control strategy Methods 0.000 claims abstract description 7
- 238000005728 strengthening Methods 0.000 claims abstract description 7
- 239000010802 sludge Substances 0.000 claims description 59
- 238000010992 reflux Methods 0.000 claims description 52
- 238000012806 monitoring device Methods 0.000 claims description 29
- 238000012544 monitoring process Methods 0.000 claims description 24
- 238000005273 aeration Methods 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract 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 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 abstract 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 241001453382 Nitrosomonadales Species 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 2
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229920002527 Glycogen Polymers 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229940096919 glycogen Drugs 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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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- Biodiversity & Conservation Biology (AREA)
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Abstract
An apparatus and a method for strengthening anaerobic ammoxidation in an anoxic zone after an AOA process by sectional water inflow belong to the field of sewage treatment and resource utilization. The device sets up the second section of intaking that gets into the anoxic zone on the basis of AOA technology to supporting corresponding control strategy. Organic matters in the first-stage inflow water are stored as an internal carbon source in an anaerobic zone, nitrate nitrogen and nitrite nitrogen generated in an aerobic zone enter a rear anoxic zone, and ammonia nitrogen in the second-stage inflow water is utilized to carry out denitrification through endogenous denitrification coupling anaerobic ammonia oxidation. In addition, the carbon source in the front anaerobic is stored and introduced with phosphorus, which is beneficial to enriching denitrifying phosphorus removal bacteria, and denitrifying phosphorus removal is carried out in a rear anoxic zone. By adding the second stage of water inflow, the concentration of ammonia nitrogen entering the anoxic zone is controlled, and compared with DO control strategy, the anaerobic ammonia oxidation bacteria enrichment is facilitated. The sectional inlet AOA technology reduces the carbon source demand of sewage denitrification and dephosphorization through anaerobic ammoxidation and denitrification, and can realize the efficient energy-saving nitrogen and phosphorus removal of low-C/N domestic sewage.
Description
Technical Field
The invention belongs to the field of urban sewage treatment and regeneration, and particularly relates to a method and a device for strengthening anaerobic ammonia oxidation of an anoxic zone at the rear part of an AOA (anaerobic ammonium oxidation) process by sectional water inflow.
Background
Due to the influence of adaptation and industrial development of chemical fertilizers, more and more nitrogen and phosphorus enter the environment, and the problem of large environmental pollution is solved. The phenomenon of eutrophication of water body caused by the entry of the water into the water ecology has seriously affected the life of people. Increasingly stringent quality standards of sewage treatment plants, especially nitrogen and phosphorus indexes, can effectively reduce the nitrogen and phosphorus concentrations in water bodies, but meeting the strict standards is a major challenge facing sewage treatment plants.
Urban sewage occupies 88.5 percent of the total sewage discharge, but deep denitrification and dephosphorization are difficult to be economically and effectively carried out due to the characteristic of low C/N of the urban sewage. Anaerobic ammoxidation is an autotrophic denitrification process in which ammonia nitrogen is used as an electron donor, and nitrous nitrogen is used as an electron acceptor, so that two nitrogen elements are converted into nitrogen and a generated part of nitrous. The process can realize partial removal of nitrogen in sewage without organic matters. Therefore, the demand for carbon sources in raw water is expected to be reduced through anaerobic ammonia oxidation denitrification. In addition, the denitrification dephosphorization bacteria can remove two pollutants of nitrogen and phosphorus simultaneously in an anoxic state, realize one-carbon dual-purpose and further save carbon sources. The combination of denitrification dephosphorization and anaerobic ammoxidation is expected to realize deep denitrification dephosphorization of low C/N wastewater.
The storage of the internal carbon source in the preposed anaerobic zone of the AOA process is beneficial to denitrification dephosphorization bacteria, and the postposed anoxic zone carries out nitrate nitrogen reduction through endogenous denitrification. Research has shown that endogenous denitrification is a slow denitrification, which is more beneficial to combining with anaerobic ammonia oxidation. However, the rear anoxic zone of the AOA process lacks ammonia nitrogen and phosphorus, and the DO of the aerobic zone is controlled to hardly realize simultaneous residual ammonia nitrogen and phosphorus, so that the introduction of the second stage of water inflow, namely the entry of raw water into the anoxic zone, is proposed to provide ammonia nitrogen and phosphorus, thereby being beneficial to realizing anaerobic ammonia oxidation and denitrification dephosphorization. And the proportion of the two sections of water inlet is controlled, so that the stable standard of nitrogen and phosphorus in the water outlet is expected to be maintained.
Disclosure of Invention
The invention aims to provide a device and a method for anaerobic ammoxidation and denitrification dephosphorization by strengthening an AOA process through staged water inflow for deep denitrification of low C/N ratio urban sewage. In the device, domestic sewage enters an anaerobic zone of an AOA reactor from first-stage water inflow respectively, and endogenous denitrifying microorganisms, aerobic dephosphorizing microorganisms and denitrifying dephosphorizing microorganisms synthesize glycogen and PHA (polyhydroxyalkanoate) by utilizing organic matters in the domestic sewage to remove the organic matters; nitrifying in the aerobic zone to generate nitrite and nitrate nitrogen and performing aerobic phosphorus absorption to remove phosphorus in the first-stage water inlet; and then, the second-stage inflow water enters an anoxic zone of the AOA reactor, ammonia nitrogen in raw water, nitrous oxide and nitrate nitrogen generated in an aerobic zone are subjected to anaerobic ammonia oxidation coupling endogenous denitrification removal, phosphorus in raw water is removed through denitrification dephosphorization, and a small amount of carbon source in raw water can be used for supplementing an internal carbon source. The anaerobic ammonia oxidation and denitrification dephosphorization are carried out to remove the nitrogen and the phosphorus in the water, so that the demand for carbon sources in raw water can be reduced, the deep denitrification of low-C/N urban domestic sewage can be realized, and the characteristics of energy conservation, consumption reduction and the like are realized.
1. The device and the method for enhancing anaerobic ammonia oxidation and denitrification dephosphorization by the sectional water inlet technology mainly comprise water inlet quality on-line monitoring equipment (1.1) which is sequentially connected with the water flow direction of sewage, a first-stage water inlet automatic control valve (2.1) and a first-stage water inlet submersible sewage pump (3.1), and then the sewage enters a water inlet anaerobic zone, and a second-stage water inlet is connected with the second-stage water inlet automatic control valve (2.2) and the second-stage water inlet submersible sewage pump (3.2) and is led into an anoxic zone; the sewage enters an AOA biochemical tank (1), sequentially passes through an anaerobic tank, an aerobic tank and an anoxic tank which are connected by a flow guide pipe, then enters a secondary sedimentation tank (2), and finally is discharged; the aerobic zone is provided with an aerobic water quality on-line monitoring device (1.2), a dissolved oxygen on-line monitoring device (4.1) and an aerobic zone variable frequency fan (5.1); the anoxic zone is provided with an anoxic water quality on-line monitoring device (1.3) and an anoxic zone variable-frequency fan (5.2); the secondary sedimentation tank is provided with an effluent water quality on-line monitoring device (1.4), and two sections of sludge reflux are respectively a second sludge reflux connected by a sludge reflux pump (3.4) to the anaerobic zone and a sludge reflux self-control valve (2.4) to the anoxic zone and a second sludge reflux connected by a sludge reflux pump (3.3) to the anoxic zone and a sludge reflux self-control valve (2.3) to the anoxic zone;
The device is used for forming a sectional water inlet proportion control system, an aerobic zone aeration control system and a sludge reflux control system, the sectional water inlet proportion control system is favorable for anaerobic ammonia oxidation and denitrification dephosphorization, but ammonia nitrogen and phosphorus introduced by the second stage water inlet are difficult to remove under the condition of no post aeration, so that the device is matched with the aerobic zone aeration control system and the sludge reflux control system to realize that the total nitrogen and the phosphorus reach the standard stably. A segmented water inlet proportion control system; the method is characterized in that: the device consists of on-line monitoring equipment (1.1) for water quality of inflow, a first section of inflow self-control valve (2.1) and a first section of inflow submersible sewage pump (3.1), a second section of inflow of the second section of inflow submersible sewage pump (3.2) of the second section of inflow self-control valve (2.2) and a PLC (programmable logic controller); an aeration control system of the aerobic zone; the method is characterized in that: the device consists of an aerobic zone water quality on-line monitoring device (1.2), an anoxic zone water quality on-line monitoring device (1.3), a dissolved oxygen on-line monitoring device (4.1), an aerobic zone variable frequency fan (5.1), an anoxic zone variable frequency fan (5.2) and a PLC (programmable logic controller) controller (3); and a sludge backflow control system: the method is characterized in that: the device consists of an effluent quality on-line monitoring device (1.5), a sludge reflux pump (3.3) to an anoxic zone, a sludge reflux self-control valve (2.3) to the anoxic zone and a PLC (programmable logic controller) controller (3);
the device and the method for enhancing anaerobic ammoxidation and denitrification dephosphorization by the sectional water inflow are characterized by comprising the following steps:
1) A sectional water inlet control strategy for realizing enrichment of anaerobic ammonia oxidation and denitrification dephosphorization bacteria
The concentration of ammonia nitrogen entering the anoxic zone is controlled to enrich and culture anaerobic ammonia oxidizing bacteria and denitrifying phosphorus removing bacteria, and the total nitrogen concentration measured value fed back by the on-line monitoring equipment of the water quality of the inflowing water is used for adjusting the two-stage inflowing water proportion: the total nitrogen concentration is less than 30mg/L, the water inflow of the first section entering the pre-anaerobic zone is 80% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 20%; when the total nitrogen concentration is 30-50mg/L, the water inflow of the first section entering the pre-anaerobic zone is 85% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 15%; when the total nitrogen concentration is more than 50mg/L, the water inflow of the first section entering the pre-anaerobic zone is 90% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 10% of the raw water inflow.
2) Aeration control strategy for maintaining ammonia nitrogen and phosphorus concentration of effluent
Because the enrichment culture time of anaerobic ammonia oxidation and denitrification dephosphorization bacteria is longer, and the contribution to the removal of nitrogen and phosphorus is unstable in the enrichment culture process, and the phosphorus of ammonia nitrogen is introduced into the second stage of inflow water, the DO concentration control of an aerobic zone and the opening and closing of aeration after an anoxic zone are matched to realize stable and standard reaching of the concentration of the ammonia nitrogen and the total phosphorus of the outflow water in the whole process of system operation; the specific strategy is as follows: adjusting the variable frequency fan through the ammonia nitrogen concentration measured value fed back by the water quality on-line monitoring equipment in the aerobic zone: when the ammonia nitrogen concentration is more than or equal to 5mg/L, the frequency of the variable frequency fan is adjusted until the online dissolved oxygen concentration monitoring value of the aerobic zone is in the range of 3-4 mg/L; when the ammonia nitrogen concentration is less than 5mg/L, the frequency of the variable frequency fan is adjusted until the online dissolved oxygen concentration monitoring value of the aerobic zone is in the range of 1-2 mg/L; and (3) performing post-aeration adjustment through a phosphorus concentration measured value fed back by water quality on-line monitoring equipment of the anoxic zone: when the phosphorus concentration is more than or equal to 0.5mg/L, a post-aeration fan is started; when the phosphorus concentration is less than 0.5mg/L, the post-aeration fan is turned off.
3) A strategy for controlling reflux ratio of the water outlet to ensure that the total nitrogen of the water outlet reaches the standard
Because the anaerobic ammonia oxidation bacteria have long enrichment time and limited contribution to total nitrogen removal, the cooperation of the regulation and control of the endogenous denitrification effect is beneficial to stabilizing the total nitrogen in the effluent. The specific rate of endogenous denitrification is related to the sludge concentration, and the total nitrogen in the effluent can be controlled by controlling the sludge reflux ratio of the reflux to the anoxic zone and adjusting the sludge concentration in the rear anoxic zone; the specific strategy is as follows: the total nitrogen concentration measured by the effluent water quality on-line monitoring equipment is used for adjusting the sludge reflux ratio of the anoxic zone: the total nitrogen concentration is less than 5mg/L, and the reflux quantity of the sludge entering the anoxic zone is 50% of the original water quantity; the total nitrogen concentration is 5-10mg/L, and the sludge reflux quantity entering the anoxic zone is 100% of the raw water quantity; the total nitrogen concentration is more than 10mg/L, and the reflux quantity of the sludge entering the anoxic zone is 150 percent of the original water quantity.
The device and the method for strengthening anaerobic ammoxidation and denitrification dephosphorization by the AOA technology through segmented water inflow have the following advantages compared with the prior art:
(1) Ammonia nitrogen is provided by adjusting the water inlet proportion of the second section, and compared with the control of aerobic aeration, the control of ammonia nitrogen surplus is more accurate and stable;
(2) Compared with a multistage A/O process, the second section of the AOA has a smaller reflux ratio, and more carbon sources can be stored in a prepositive anaerobic way, so that phosphorus removal is facilitated;
(3) The AOA technology introduces endogenous denitrification and is easier to couple with anaerobic ammonia oxidation
(5) The staged inflow AOA technology combines anaerobic ammoxidation with denitrification to remove phosphorus, thereby not only fully utilizing raw water carbon source, but also reducing carbon source requirement, and being more beneficial to deep nitrogen and phosphorus removal of low C/N sewage
Drawings
FIG. 1 is a schematic diagram of an apparatus for enhancing anaerobic ammonia oxidation and denitrification dephosphorization by sectional water inflow.
1 Is an AOA biochemical tank, 2 is a secondary sedimentation tank, 3 is a PLC controller, 4 is a computer, 1.1 is an in-line inlet water quality monitoring device, 1.2 is an in-line aerobic water quality monitoring device, 1.3 is an in-line anoxic water quality monitoring device, 1.4 is an in-line outlet water quality monitoring device, 2.1 is a first-stage inlet water self-control valve, 2.2 is a second-stage inlet water self-control valve, 2.3 is a sludge backflow self-control valve to an anoxic zone, 2.4 is a sludge backflow self-control valve to an anaerobic zone, 3.1 is a first-stage inlet water submersible pump, 3.2 is a second-stage inlet water submersible pump, 3.3 is a sludge backflow pump to the anoxic zone, 3.4 is a sludge backflow pump to the anaerobic zone, 4.1 is an in-line dissolved oxygen monitoring device, 5.1 is an aerobic zone variable frequency fan, and 5.2 is an anoxic zone variable frequency fan
The specific embodiment is as follows:
The invention is further described with reference to the drawings and the implementation: the invention sets up double sludge reflux and double water inflow on the basis of an AOA reactor, combines a PLC control system, sets up a sectional water inflow proportion control system, an aerobic zone aeration control system and a sludge reflux control system, and is respectively used for realizing enrichment culture of anaerobic ammonia oxidation and denitrification phosphorus accumulating bacteria, controlling the concentration of ammonia nitrogen and phosphorus in water outlet of the system and controlling the total nitrogen concentration of the water outlet, and realizing stable standard reaching of total nitrogen and phosphorus in the water outlet ammonia nitrogen of the sectional water inflow AOA process.
The device for strengthening anaerobic ammoxidation and denitrification dephosphorization by sectional water inflow is a water inflow water quality on-line monitoring device (1.1) which is sequentially connected with the sewage flow direction, a first-stage water inflow self-control valve (2.1) and a first-stage water inflow submersible sewage pump (3.1) are connected, then sewage is fed into a water inflow anaerobic zone, and a second-stage water inflow is connected with the second-stage water inflow submersible sewage pump (3.2) through a second-stage water inflow self-control valve (2.2) and a second-stage water inflow submersible sewage pump (3.2) to be led into an anoxic zone; the sewage enters an AOA biochemical tank (1), sequentially passes through an anaerobic tank, an aerobic tank and an anoxic tank which are connected by a flow guide pipe, then enters a secondary sedimentation tank (2), and finally is discharged; the aerobic zone is provided with an aerobic water quality on-line monitoring device (1.2), a dissolved oxygen on-line monitoring device (4.1) and an aerobic zone variable frequency fan (5.1); the anoxic zone is provided with an anoxic water quality on-line monitoring device (1.3) and an anoxic zone variable-frequency fan (5.2); the secondary sedimentation tank is provided with an effluent water quality on-line monitoring device (1.4), and two sections of sludge reflux are respectively a second sludge reflux connected by a sludge reflux pump (3.4) to the anaerobic zone and a sludge reflux self-control valve (2.4) to the anoxic zone and a second sludge reflux connected by a sludge reflux pump (3.3) to the anoxic zone and a sludge reflux self-control valve (2.3) to the anoxic zone;
The AOA biochemical cell was set as follows: the overall residence time is 12-16 hours, anaerobic: and (3) aerobic: the ratio of hypoxia is 2:2:4 or 2:3:3, depending on the specific water quality. MLSS is controlled at 3000-5000mg/L, the reflux amount of sludge returned to the anaerobic zone is 50-100% of the water inflow amount, and SRT is controlled at 15-30 days.
The device for strengthening anaerobic ammonia oxidation and denitrification dephosphorization by the sectional water inlet process is used for forming a sectional water inlet proportion control system, and the sectional water inlet proportion control system comprises water inlet quality on-line monitoring equipment (1.1), a first section water inlet self-control valve (2.1) and a first section water inlet submersible sewage pump (3.1), a second section water inlet self-control valve (2.2) and a second section water inlet of the second section water inlet submersible sewage pump (3.2) and a PLC controller (3); the aerobic zone aeration control system comprises an aerobic zone water quality on-line monitoring device (1.2), an anoxic zone water quality on-line monitoring device (1.3), a dissolved oxygen on-line monitoring device (4.1), an aerobic zone variable frequency fan (5.1), an anoxic zone variable frequency fan (5.2) and a PLC (programmable logic controller) controller (3); the sludge reflux control system comprises the effluent water quality on-line monitoring equipment (1.5), a sludge reflux pump (3.3) to the anoxic zone, a sludge reflux self-control valve (2.3) to the anoxic zone and a PLC (programmable logic controller) controller (3);
The specific operation is as follows:
Inoculating activated sludge of municipal sewage treatment plant, and adopting municipal sewage as inflow water. The ammonia nitrogen concentration in the anoxic zone after entering is ensured by a sectional water inlet strategy, and meanwhile, phosphorus in raw water is brought into the anoxic zone to perform enrichment culture of anaerobic ammonia oxidizing bacteria and denitrifying phosphorus removing bacteria. The treatment effect of the system in the water-through operation period is ensured by matching aeration control and sludge backflow control, and the system is not influenced by anaerobic ammoxidation and denitrification dephosphorization. The specific strategy is as follows:
1) A sectional water inlet control strategy for realizing enrichment of anaerobic ammonia oxidation and denitrification dephosphorization bacteria
The concentration of ammonia nitrogen entering the anoxic zone is controlled to enrich and culture anaerobic ammonia oxidizing bacteria and denitrifying phosphorus removing bacteria, and the total nitrogen concentration measured value fed back by the on-line monitoring equipment of the water quality of the inflowing water is used for adjusting the two-stage inflowing water proportion: the total nitrogen concentration is less than 30mg/L, the water inflow of the first section entering the pre-anaerobic zone is 80% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 20%; when the total nitrogen concentration is 30-50mg/L, the water inflow of the first section entering the pre-anaerobic zone is 85% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 15%; when the total nitrogen concentration is more than 50mg/L, the water inflow of the first section entering the pre-anaerobic zone is 90% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 10% of the raw water inflow.
2) Aeration control strategy for maintaining ammonia nitrogen and phosphorus concentration of effluent
Because the enrichment culture time of anaerobic ammonia oxidation and denitrification dephosphorization bacteria is longer, and the contribution to the removal of nitrogen and phosphorus is unstable in the enrichment culture process, and the phosphorus of ammonia nitrogen is introduced into the second stage of inflow water, the DO concentration control of an aerobic zone and the opening and closing of aeration after an anoxic zone are matched to realize stable and standard reaching of the concentration of the ammonia nitrogen and the total phosphorus of the outflow water in the whole process of system operation; the specific strategy is as follows: adjusting the variable frequency fan through the ammonia nitrogen concentration measured value fed back by the water quality on-line monitoring equipment in the aerobic zone: when the ammonia nitrogen concentration is more than or equal to 5mg/L, the frequency of the variable frequency fan is adjusted until the online dissolved oxygen concentration monitoring value of the aerobic zone is in the range of 3-4 mg/L; when the ammonia nitrogen concentration is less than 5mg/L, the frequency of the variable frequency fan is adjusted until the online dissolved oxygen concentration monitoring value of the aerobic zone is in the range of 1-2 mg/L; and (3) performing post-aeration adjustment through a phosphorus concentration measured value fed back by water quality on-line monitoring equipment of the anoxic zone: when the phosphorus concentration is more than or equal to 0.5mg/L, a post-aeration fan is started; when the phosphorus concentration is less than 0.5mg/L, the post-aeration fan is turned off.
3) A strategy for controlling reflux ratio of the water outlet to ensure that the total nitrogen of the water outlet reaches the standard
Because the anaerobic ammonia oxidation bacteria have long enrichment time and limited contribution to total nitrogen removal, the cooperation of the regulation and control of the endogenous denitrification effect is beneficial to stabilizing the total nitrogen in the effluent. The specific rate of endogenous denitrification is related to the sludge concentration, and the total nitrogen in the effluent can be controlled by controlling the sludge reflux ratio of the reflux to the anoxic zone and adjusting the sludge concentration in the rear anoxic zone; the specific strategy is as follows: the total nitrogen concentration measured by the effluent water quality on-line monitoring equipment is used for adjusting the sludge reflux ratio of the anoxic zone: the total nitrogen concentration is less than 5mg/L, and the reflux quantity of the sludge entering the anoxic zone is 50% of the original water quantity; the total nitrogen concentration is 5-10mg/L, and the sludge reflux quantity entering the anoxic zone is 100% of the raw water quantity; the total nitrogen concentration is more than 10mg/L, and the reflux quantity of the sludge entering the anoxic zone is 150 percent of the original water quantity.
The foregoing is illustrative of the present invention and is not intended to be limiting, as the invention may be more readily understood and practiced by those skilled in the art, and as such, simply modified within the scope of this invention.
Claims (1)
1. The method for strengthening anaerobic ammoxidation of the post anoxic zone of the AOA process by sectional water inflow is characterized by comprising the following steps: the device used in the method is on-line monitoring equipment (1.1) for water quality of inflow water, which is sequentially connected with the flow direction of the sewage, wherein a first-stage water inflow self-control valve (2.1) and a first-stage water inflow submersible sewage pump (3.1) are connected, then the sewage enters an anaerobic zone, and a second-stage water inflow is connected with the second-stage water inflow submersible sewage pump (3.2) through a second-stage water inflow self-control valve (2.2) and is led into an anoxic zone; the sewage enters an AOA biochemical tank (1), sequentially passes through an anaerobic tank, an aerobic tank and an anoxic tank which are connected by a flow guide pipe, then enters a secondary sedimentation tank (2), and finally is discharged; the aerobic zone is provided with an aerobic water quality on-line monitoring device (1.2), a dissolved oxygen on-line monitoring device (4.1) and an aerobic zone variable frequency fan (5.1); the anoxic zone is provided with anoxic water quality on-line monitoring equipment (1.3) and an anoxic zone variable-frequency fan (5.2); the secondary sedimentation tank is provided with an effluent water quality on-line monitoring device (1.4), and two sections of sludge reflux are respectively a first sludge reflux connected with an anaerobic zone sludge reflux pump (3.4) and an anaerobic zone sludge reflux automatic control valve (2.4) and a second sludge reflux connected with an anoxic zone sludge reflux pump (3.3) and an anoxic zone sludge reflux automatic control valve (2.3);
The device comprises a PLC (programmable logic controller) 3 and a computer 4, wherein the PLC is connected with a water inlet quality on-line monitoring device 1.1, an aerobic water quality on-line monitoring device 1.2, an anoxic water quality on-line monitoring device 1.3, an effluent water quality on-line monitoring device 1.4, a first-stage water inlet automatic control valve 2.1, a second-stage water inlet automatic control valve 2.2, a sludge backflow automatic control valve 2.3 in an anoxic zone, a sludge backflow automatic control valve 2.4 in an anaerobic zone, a first-stage water inlet submersible sewage pump 3.1, a second-stage water inlet submersible sewage pump 3.2, a dissolved oxygen on-line monitoring device 4.1, an aerobic zone variable frequency fan 5.1 and an anoxic zone variable frequency fan 5.2 are connected through communication;
The method comprises the following steps:
(1) Anaerobic ammonia oxidation bacteria and denitrification dephosphorization bacteria enrichment is carried out by controlling the concentration of ammonia nitrogen entering an anoxic zone, and the two-stage water inlet proportion is adjusted by the total nitrogen concentration measured value fed back by the water quality on-line monitoring equipment of inlet water: the total nitrogen concentration is less than 30 mg/L, the water inflow of the first section entering the pre-anaerobic zone is 80% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 20%; when the total nitrogen concentration is 30-50 mg/L, the water inflow of the first section entering the pre-anaerobic zone is 85% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 15%; when the total nitrogen concentration is more than 50 mg/L, the water inflow of the first section entering the pre-anaerobic zone is 90% of the raw water inflow, and the water inflow of the second section entering the anoxic zone is 10%;
(2) In order to ensure that the phosphorus introduced by ammonia nitrogen in the second stage of water inflow does not affect the quality of the water, the stable standard of the ammonia nitrogen and total phosphorus concentration of the water is realized by adopting the control of the dissolved oxygen concentration of an aerobic zone and the opening and closing of aeration after an anoxic zone: adjusting the variable frequency fan through the ammonia nitrogen concentration measured value fed back by the water quality on-line monitoring equipment in the aerobic zone: when the ammonia nitrogen concentration is greater than or equal to 5 mg/L, the frequency of the variable frequency fan is adjusted until the monitoring value of the online dissolved oxygen concentration of the aerobic zone is within the range of 3-4 mg/L; when the ammonia nitrogen concentration is less than 5 mg/L, the frequency of the variable frequency fan is adjusted until the online dissolved oxygen concentration monitoring value of the aerobic zone is within the range of 1-2 mg/L; and (3) performing post-aeration adjustment through a phosphorus concentration measured value fed back by water quality on-line monitoring equipment of the anoxic zone: when the phosphorus concentration is more than or equal to 0.5 mg/L, starting a post-aeration fan; when the phosphorus concentration is less than 0.5 mg/L, the post-aeration fan is turned off;
(3) Controlling the sludge reflux ratio of the reflux to the anoxic zone, and maintaining a total nitrogen concentration control strategy of the effluent; the total nitrogen concentration measured by the effluent water quality on-line monitoring equipment is used for adjusting the sludge reflux ratio of the anoxic zone: the total nitrogen concentration is less than 5 mg/L, and the reflux quantity of the sludge entering the anoxic zone is 50% of the original water quantity; the total nitrogen concentration is 5-10 mg/L, and the sludge reflux quantity entering the anoxic zone is 100% of the raw water quantity; the total nitrogen concentration is more than 10mg/L, and the reflux quantity of the sludge entering the anoxic zone is 150 percent of the original water quantity.
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| CN107381813A (en) * | 2017-08-31 | 2017-11-24 | 北京城市排水集团有限责任公司 | The device and method of sludge segment reflux strengthened anaerobic ammoxidation denitrification process |
| CN109368792A (en) * | 2018-12-06 | 2019-02-22 | 北京工业大学 | The method and apparatus of sludge dual reflux AOA short distance nitration coupling Anammox and endogenous denitrification Treating Municipal Sewage |
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| CN114477420A (en) * | 2022-02-16 | 2022-05-13 | 北京工业大学 | Method and device for realizing deep denitrification of sewage by virtue of double coupling of continuous flow AOA (argon oxygen decarburization) short-cut nitrification and endogenous short-cut denitrification and anaerobic ammonia oxidation |
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| CN107381813A (en) * | 2017-08-31 | 2017-11-24 | 北京城市排水集团有限责任公司 | The device and method of sludge segment reflux strengthened anaerobic ammoxidation denitrification process |
| CN109368792A (en) * | 2018-12-06 | 2019-02-22 | 北京工业大学 | The method and apparatus of sludge dual reflux AOA short distance nitration coupling Anammox and endogenous denitrification Treating Municipal Sewage |
| CN110015757A (en) * | 2019-04-30 | 2019-07-16 | 北京工业大学 | The method and apparatus of the endogenous short-cut denitrification coupling Anammox Treating Municipal Sewage in AOA technique anoxic zone |
| CN114477420A (en) * | 2022-02-16 | 2022-05-13 | 北京工业大学 | Method and device for realizing deep denitrification of sewage by virtue of double coupling of continuous flow AOA (argon oxygen decarburization) short-cut nitrification and endogenous short-cut denitrification and anaerobic ammonia oxidation |
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