CN113979535A - Nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system and sewage treatment method - Google Patents
Nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system and sewage treatment method Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 137
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 72
- 230000003647 oxidation Effects 0.000 title claims abstract description 70
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 324
- 239000010802 sludge Substances 0.000 claims abstract description 111
- 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 abstract description 47
- 239000000945 filler Substances 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000036284 oxygen consumption Effects 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 339
- 230000001105 regulatory effect Effects 0.000 claims description 158
- 239000007788 liquid Substances 0.000 claims description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 46
- 239000001301 oxygen Substances 0.000 claims description 46
- 229910052760 oxygen Inorganic materials 0.000 claims description 46
- 238000004062 sedimentation Methods 0.000 claims description 29
- 239000000126 substance Substances 0.000 claims description 29
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 24
- 238000006396 nitration reaction Methods 0.000 claims description 24
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 20
- 238000005273 aeration Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 16
- 230000001546 nitrifying effect Effects 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000002351 wastewater Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract description 6
- 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 description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- SQDFHQJTAWCFIB-UHFFFAOYSA-N n-methylidenehydroxylamine Chemical compound ON=C SQDFHQJTAWCFIB-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
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- 235000017281 sodium acetate Nutrition 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
- C02F3/28—Anaerobic digestion processes
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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)
- Hydrology & Water Resources (AREA)
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- 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 provides a nitrification-partial denitrification anaerobic ammonium oxidation sewage treatment system and a sewage treatment method, wherein part of sewage to be treated in the nitrification-partial denitrification anaerobic ammonium oxidation sewage treatment system directly enters an SBR reactor, oxidation in an aerobic activated sludge reactor is not needed, and only part of sewage to be treated needs energy consumption for nitrification reaction, so that the oxygen consumption of the system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in the SBR reactor, only nitrate nitrogen needs to be converted into nitrite nitrogen in the reaction of nitrate nitrogen, oxygen consumption materials and partial denitrification-anaerobic ammonia oxidation fillers, and further reduction into nitrogen is not needed, so that the demand of the oxygen consumption materials is reduced, and the source of the oxygen consumption materials is the sewage to be treated, and an external carbon source does not need to be introduced; the introduction of the control device is beneficial to the high-efficiency operation of sewage treatment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system and a using method thereof.
Background
In order to solve the problems of water environment pollution, water resource shortage and the like caused by excessive discharge of nitrogen elements, the discharge standard of China for urban sewage plants is continuously improved. The traditional anoxic and scratchy (A/O) biological denitrification process is mostly adopted in the existing sewage treatment plant in China, and the process has the problems of high aeration energy consumption, additional carbon source requirement, difficulty in reaching the effluent quality standard, high sludge yield and the like. Therefore, the exploration of the application of the novel short-cut denitrification anaerobic ammonia oxidation process in sewage treatment has great significance.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provide a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system, only part of sewage to be treated needs to consume energy for nitrification reaction, so that the oxygen consumption of the system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in the SBR reactor, only nitrate nitrogen needs to be converted into nitrite nitrogen in the reaction of the nitrate nitrogen and oxygen consumption substances, and further reduction into nitrogen is not needed, so that the demand of the oxygen consumption substances is reduced, and the source of the oxygen consumption substances is the sewage to be treated, and an external carbon source does not need to be introduced; the introduction of the control device is beneficial to the high-efficiency operation of sewage treatment.
The invention is realized by the following technical scheme:
a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system comprises a water storage tank, an aerobic activated sludge reactor, an SBR reactor and a control device;
the water storage tank is used for storing sewage to be treated, and the sewage to be treated contains ammonia nitrogen and oxygen consumption substances; the water storage tank is provided with a first water storage tank water outlet pipe and a second water storage tank water outlet pipe;
the aerobic activated sludge reactor is connected with the water outlet pipe of the first water storage tank through a reactor water inlet pump; aerobic activated sludge is contained in the aerobic activated sludge reactor and is used for carrying out nitration reaction with the ammonia nitrogen to generate nitration liquid, and the nitration liquid contains nitrate nitrogen;
the SBR reactor comprises a first SBR water inlet pipe, a second SBR water inlet pipe and a plurality of reaction chambers which are arranged in parallel;
the first SBR water inlet pipe is communicated with the aerobic activated sludge reactor through a first SBR water inlet pump; the second SBR water inlet pipe is connected with a water outlet pipe of the second water storage tank through a second SBR water inlet pump;
each reaction chamber comprises a reaction chamber body, and a first reaction chamber water inlet regulating pipe, a first reaction chamber water outlet regulating pipe and a second reaction chamber water inlet regulating pipe which are communicated with the reaction chamber body;
the reaction chamber body is internally provided with a part of denitrification-anaerobic ammonia oxidation filler, and the part of denitrification-anaerobic ammonia oxidation filler is used for reacting with oxygen consuming substances in sewage to be treated and nitrate nitrogen in the nitrified liquid to generate nitrite and reducing the nitrite into nitrogen;
a first reaction chamber water inlet adjusting pipe of each reaction chamber is communicated with the first SBR water inlet pipe, and a first reaction chamber water inlet adjusting valve is correspondingly arranged on the first reaction chamber water inlet adjusting pipe;
the first reaction chamber water outlet adjusting pipe is correspondingly provided with a first reaction chamber water outlet adjusting valve;
a second reaction chamber water inlet adjusting pipe of each reaction chamber is communicated with the second SBR water inlet pipe, and a second reaction chamber water inlet adjusting valve is correspondingly arranged on the second reaction chamber water inlet adjusting pipe;
the control device is electrically connected with the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve and is used for independently controlling the opening or closing of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve in each reaction chamber.
In the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system, part of sewage to be treated in the water storage tank flows into the aerobic activated sludge reactor to generate nitrification reaction, ammonia nitrogen in the sewage to be treated is oxidized into nitrate nitrogen to obtain nitrified liquid, the other part of sewage to be treated in the water storage tank directly enters the SBR reactor, part of denitrification-anaerobic ammonia oxidation fillers can be used for generating partial denitrification reaction and anaerobic ammonia oxidation reaction in each reaction chamber of the SBR reactor, oxygen-consuming substances and part of denitrification-anaerobic ammonia oxidation fillers in the sewage to be treated reduce the nitrate nitrogen in the nitrified liquid into nitrite, and the generated nitrite and the ammonia nitrogen in the sewage to be treated are removed through the partial denitrification-anaerobic ammonia oxidation fillers; the method comprises the steps of introducing a control device to realize control over each reaction chamber in the SBR reactor, controlling at least one reaction chamber to be in a water inlet state, at least one reaction chamber to be in a treatment state and at least one reaction chamber to be in a water outlet state by controlling in each reaction stage, enabling each reaction chamber to react in a time-sharing mode, realizing non-intermittent treatment and effectively improving the sewage treatment efficiency.
In addition, in the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system, part of sewage to be treated directly enters the SBR reactor, oxidation in the aerobic activated sludge reactor is not needed, and only part of the sewage to be treated needs energy consumption for nitrification reaction, so that the oxygen consumption of the system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in the SBR reactor, only nitrate nitrogen needs to be converted into nitrite nitrogen in the reaction of nitrate nitrogen, oxygen consumption materials and partial denitrification-anaerobic ammonia oxidation fillers, and further reduction into nitrogen is not needed, so that the demand of the oxygen consumption materials is reduced, and the source of the oxygen consumption materials is the sewage to be treated, and an external carbon source does not need to be introduced; the introduction of the control device is beneficial to the high-efficiency operation of sewage treatment.
Furthermore, the working state of each reaction chamber in the SBR reactor sequentially comprises a water inlet state, a treatment state and a water outlet state; when one reaction chamber is in the water inlet state, the corresponding water inlet regulating valve of the first reaction chamber and the corresponding water inlet regulating valve of the second reaction chamber are in the open state, and the water outlet regulating valve of the first reaction chamber is in the closed state; when one reaction chamber is in the treatment state, the corresponding water inlet regulating valve of the first reaction chamber, the corresponding water inlet regulating valve of the second reaction chamber and the corresponding water outlet regulating valve of the first reaction chamber are all in a closed state; when one reaction chamber is in a water outlet state, the corresponding water inlet regulating valve of the first reaction chamber and the corresponding water inlet regulating valve of the second reaction chamber are in a closed state, and the water outlet regulating valve of the first reaction chamber is in an open state; the control device controls the states of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve; the SBR reactor comprises a reaction cycle and a control device, wherein the reaction cycle of the SBR reactor comprises a plurality of reaction stages, and in each reaction stage, the control device controls at least one reaction chamber to be in a water inlet state, at least one reaction chamber to be in a treatment state and at least one reaction chamber to be in a water outlet state. The reaction chambers are controlled to be in different states so as to achieve the effect that the SBR reactor can work without intermission during sewage treatment. When the reaction chamber is in a water inlet state, nitrifying liquid generated in the aerobic activated sludge reactor and the sewage to be treated in the water storage tank flow into the reaction chamber; when the reaction chamber is in a treatment state, reducing nitrate nitrogen in the nitrifying liquid into nitrite by using oxygen-consuming substances in the sewage to be treated, and reacting ammonia nitrogen in the sewage to be treated and the generated nitrite under the action of the partial denitrification-anaerobic ammonia oxidation filler to generate nitrogen; when the reaction chamber is in a water outlet state, the solution in the reaction chamber flows out through the first water outlet adjusting pipe.
Further, the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system also comprises a secondary sedimentation tank and a regulating water tank; the secondary sedimentation tank is used for settling aerobic activated sludge brought out along with liquid, and is connected with the aerobic activated sludge reactor through a secondary sedimentation tank water inlet pipe; the secondary sedimentation tank is connected with the water outlet pipe of the first water storage tank or the aerobic activated sludge reactor through a return pipe, and the return pipe is provided with a return pump; the secondary sedimentation tank is connected with the regulating water tank through a secondary sedimentation tank water outlet pipe, and the regulating water tank is connected with the first SBR water inlet pipe through the first SBR water inlet pump. The sewage to be treated is subjected to nitration reaction in the aerobic activated sludge reactor to generate nitration liquid, the nitration liquid flows through the secondary sedimentation tank and is separated in the secondary sedimentation tank to obtain layered nitration liquid and aerobic activated sludge carried out by the nitration liquid, the aerobic activated sludge flows back to the aerobic activated sludge reactor through the return pipe, and the nitration liquid enters the regulating water tank and then flows into the SBR reactor; the control device controls the work of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve so as to regulate the flow of the nitrified liquid entering the SBR reactor, and the regulating water tank can play a role of temporarily storing the nitrified liquid.
Further, the aerobic activated sludge reactor comprises a plurality of grid chambers, the grid chambers are sequentially communicated end to form a grid chamber group, and the water outlet pipe of the first water storage tank and the water inlet pipe of the secondary sedimentation tank are respectively communicated with two ends of the grid chamber group;
two side walls of each cell, which are opposite to each other along the flowing direction of the liquid in the cell group, are provided with overflowing holes, and in the same cell, the height of the overflowing hole of one side wall is different from that of the overflowing hole of the other side wall; each cell is communicated with the adjacent cell through the overflowing holes, and the overflowing holes of the two adjacent cells are distributed in a staggered mode. Liquid flows into in the check room group, in same check room, under the guide of overflowing the orifice, liquid flow path is from the overflowing orifice of a lateral wall to the overflowing orifice of another lateral wall, because the position of each overflowing orifice is controlled to each check room through overflowing orifice intercommunication and the crisscross distribution of overflowing orifice, can make liquid fully flow and prolonged reaction time in check room 24, and the ammonia nitrogen obtains abundant oxidation formation nitrone, improves nitrone concentration.
Further, the aerobic activated sludge reactor also comprises an oxygen supply part, wherein the oxygen supply part comprises a plurality of aeration heads, a plurality of air flow regulating valves, a gas flowmeter and an air compressor;
the number of the aeration heads and the number of the air volume adjusting valves are the same as that of the grid chambers, each aeration head is correspondingly arranged in one grid chamber, and each air volume adjusting valve is connected with one aeration head; the gas flow meter is connected with each gas flow regulating valve, and the air compressor is connected with the gas flow meter. The oxygen supply part is used for oxygen filling and aeration of the grid chamber and providing energy required by ammonia nitrogen oxidation for the microorganisms in the aerobic activated sludge. The air compressor is used for providing oxygen, the gas flow meter can detect the oxygen provided by the air compressor, the flow of the oxygen is adjusted through the gas flow adjusting valve, and then the oxygen is introduced into the cells through the aeration head.
Preferably, the SBR reactor further comprises a plurality of stirrers, the number of the stirrers is the same as the number of the reaction chambers, and each stirrer is correspondingly arranged in one of the reaction chambers; the control device is electrically connected with each stirrer and controls the opening or closing of the stirrers. The stirrer is used for improving the reaction efficiency of partial denitrification reaction and anaerobic ammonia oxidation in the SBR reactor.
Further, the activated sludge in the aerobic activated sludge reactor is aged for more than 10 days, the dissolved oxygen concentration of the activated sludge is 1-2mg/L, the activated sludge reflux ratio is 50-100%, and the activated sludge reflux ratio is the ratio of the mass of the activated sludge returned from the reflux pipe to the mass of the total activated sludge. And selecting proper activated sludge to ensure that ammonia nitrogen in the sewage to be treated can be fully oxidized into nitrate nitrogen.
Further, the filling ratio of the partial denitrification-anaerobic ammonia oxidation filler in the SBR reactor is 15-40%, and the concentration of the anaerobic ammonia oxidation activated sludge is 2000-4000 mg/L. And selecting proper partial denitrification-anaerobic ammonia oxidation filler and adjusting parameters to ensure partial denitrification reaction.
The invention also provides a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method, which uses the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system for treatment and specifically comprises the following steps:
1) introducing sewage to be treated into the water storage tank;
2) the second water inlet pump is started, part of the sewage to be treated in the water storage tank enters the aerobic activated sludge reactor through the water outlet pipe of the first water storage tank, and in the aerobic activated sludge reactor, the aerobic activated sludge and ammonia nitrogen in the sewage to be treated are subjected to nitration reaction to generate nitration liquid containing nitrate nitrogen;
3) the control device controls the opening or closing of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve in each reaction chamber independently;
measuring the oxygen equivalent COD of the oxygen consuming substance in the SBR reactor, calculating the ratio of the oxygen equivalent COD to the nitrate nitrogen in the SBR reactor, and when the oxygen equivalent COD: when nitrate nitrogen is less than or equal to 2, adding a carbon source, and adjusting to oxygen equivalent COD: nitrate nitrogen is more than or equal to 2;
the control device controls at least one reaction chamber in the SBR reactor to be in a water inlet state, and at the moment, nitrifying liquid generated in the aerobic activated sludge reactor and sewage to be treated in the water storage tank enter the reaction chamber;
the control device controls at least one reaction chamber in the SBR reactor to be in a treatment state, at the moment, oxygen-consuming substances and partial denitrification-anaerobic ammonia oxidation fillers in the sewage to be treated reduce nitrate nitrogen in the nitrifying liquid into nitrite, and ammonia nitrogen and generated nitrite in the sewage to be treated react under the action of the partial denitrification-anaerobic ammonia oxidation fillers to generate nitrogen;
the control device controls at least one reaction chamber in the SBR reactor to be in a water outlet state, and at the moment, the solution treated in the reaction chamber flows out through the water inlet adjusting pipe of the first reaction chamber.
According to the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method, part of sewage to be treated directly enters the SBR reactor, and does not need to be oxidized in the aerobic activated sludge reactor, so that the oxygen consumption of a system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in the SBR reactor, only nitrate nitrogen needs to be converted into nitrite nitrogen in the reaction of the nitrate nitrogen and oxygen consumption substances, and further reduction into nitrogen is not needed, so that the demand of the oxygen consumption substances is reduced, and the source of the oxygen consumption substances is the sewage to be treated, and an external carbon source does not need to be introduced; the control device is introduced, and each reaction chamber carries out sewage treatment in a time-sharing manner, thereby being beneficial to the high-efficiency operation of sewage treatment.
Further, sewage to be treated in the water storage tank enters the aerobic activated sludge reactor through a water outlet pipe of the first water storage tank, and the total flow rate of the sewage is Q1; sewage to be treated in the water storage tank enters the SBR reactor through the second SBR water inlet pipe, and the flow rate of the sewage is Q2; q1; q2 is less than or equal to 1: 1. The sewage to be treated with the flow rate of Q1 is subjected to nitration reaction, nitrate nitrogen is generated and enters the SBR reactor to react with oxygen-consuming substances, and the proportion of Q1 and Q2 is required to be controlled in order to ensure that the nitrate nitrogen can be subjected to partial denitrification reaction.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view showing the structure of a nitrification-partial denitrification anammox sewage treatment system in example 1.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating to the embodiments of the present invention are shown in the drawings.
Furthermore, the terms first, second, third and the like in the description and in the claims, are used for descriptive purposes only to distinguish one element from another, and are not to be construed as indicating or implying relative importance or implying any order or order to the indicated elements. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Similarly, the terms "fixed" and "connected," as used in the description and claims, are not to be construed as limited to direct connection. Thus, the expression "device a is connected to device B" should not be limited to devices or systems in which device a is directly connected to device B, meaning that there is a path between device a and device B, which may be a path including other devices or tools.
Example 1
The invention provides a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system, and fig. 1 is a schematic structural diagram of the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system, as shown in fig. 1, the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system comprises a water storage tank 1, an aerobic activated sludge reactor 2, a secondary sedimentation tank 3, an SBR reactor 5 and a control device 6;
the water storage tank 1 is used for storing sewage to be treated, and the sewage to be treated contains ammonia nitrogen and oxygen consumption substances; the water storage tank 1 is provided with a first water storage tank water outlet pipe 11 and a second water storage tank water outlet pipe 12;
the aerobic activated sludge reactor 2 is connected with a water outlet pipe 11 of the first water storage tank through a reactor water inlet pump 22; aerobic activated sludge is contained in the aerobic activated sludge reactor 2, the aerobic activated sludge is used for carrying out nitration reaction with the ammonia nitrogen to generate nitration liquid, and the nitration liquid contains nitrate nitrogen;
the SBR reactor 5 comprises a first SBR water inlet pipe 51, a second SBR water inlet pipe 55 and a plurality of reaction chambers 57 which are arranged in parallel;
the first SBR water inlet pipe 51 is communicated with the aerobic activated sludge reactor 2 through a first SBR water inlet pump 52; the second SBR water inlet pipe 55 is connected with the second water storage tank water outlet pipe 12 through a second SBR water inlet pump 56;
each reaction chamber 57 comprises a reaction chamber body 577, and a first reaction chamber water inlet regulating pipe 571, a first reaction chamber water outlet regulating pipe 573 and a second reaction chamber water inlet regulating pipe 575 which are communicated with the reaction chamber body 577;
a partial denitrification-anaerobic ammonia oxidation filler is contained in the reaction chamber body 577, and is used for reacting with oxygen consuming substances and nitrate nitrogen in sewage to be treated to generate nitrite and reducing the nitrite into nitrogen;
first reaction chamber water inlet regulating valve 572, first reaction chamber water outlet regulating valve 574, and second reaction chamber water inlet regulating valve 576
The first reaction chamber water inlet regulating pipe 571 of each reaction chamber is communicated with the first SBR water inlet pipe 51, and the first reaction chamber water inlet regulating valve 572 is correspondingly arranged on the first reaction chamber water inlet regulating pipe 574;
a first reaction chamber water outlet regulating valve 574 is correspondingly arranged on the first reaction chamber water outlet regulating pipe 573;
the second reaction chamber water inlet regulating pipe 575 of each reaction chamber is communicated with the second SBR water inlet pipe 55, and a second reaction chamber water inlet regulating valve 576 is correspondingly arranged on the second reaction chamber water inlet regulating pipe 575;
the control device 6 is electrically connected to the first reaction chamber water inlet regulating valve 572, the first reaction chamber water outlet regulating valve 574, and the second reaction chamber water inlet regulating valve 576, and individually controls the opening or closing of the first reaction chamber water inlet regulating valve 572, the first reaction chamber water outlet regulating valve 574, and the second reaction chamber water inlet regulating valve 576 in each reaction chamber 57.
In the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system of this embodiment 1, a part of the sewage to be treated in the water storage tank 1 flows into the aerobic activated sludge reactor 2 to undergo nitrification reaction, and ammonia nitrogen in the sewage to be treated is oxidized into nitrate nitrogen to obtain nitrified liquid, which enters the SBR reactor 5; the other part of the sewage to be treated in the water storage tank 1 directly enters an SBR reactor 5, in each reaction chamber of the SBR reactor 5, part of denitrification-anaerobic ammonia oxidation filler can be used for partial denitrification reaction and anaerobic ammonia oxidation reaction, oxygen consumption substances and part of the denitrification-anaerobic ammonia oxidation filler in the sewage to be treated reduce nitrate nitrogen in a nitrifying liquid into nitrite, and the generated nitrite and ammonia nitrogen in the sewage to be treated are removed through the part of denitrification-anaerobic ammonia oxidation filler; the control device 6 is introduced to realize the control of each reaction chamber 57 in the SBR reactor 5, and in each reaction stage, the control device 6 controls at least one reaction chamber 57 to be in a water inlet state, at least one reaction chamber 57 to be in a treatment state and at least one reaction chamber 57 to be in a water outlet state, so that each reaction chamber 57 is subjected to time-sharing reaction, the non-intermittent treatment is realized, and the sewage treatment efficiency is improved.
In addition, in the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system of the embodiment 1, part of the sewage to be treated directly enters the SBR reactor 5, and does not need to be oxidized in the aerobic activated sludge reactor 2, and only part of the sewage to be treated needs to consume energy for nitrification reaction, so that the oxygen consumption of the system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in each reaction chamber of the SBR reactor 5, and in the reaction of nitrate nitrogen, oxygen-consuming substances and partial denitrification-anaerobic ammonia oxidation filling materials, only the nitrate nitrogen needs to be converted into nitrite nitrogen without being further reduced into nitrogen, so that the demand of the oxygen-consuming substances is reduced, and the oxygen-consuming substances are from the sewage to be treated and can be introduced without external carbon sources; the introduction of the control device 6 is beneficial to the high-efficiency operation of sewage treatment.
Preferably, the working state of each reaction chamber 57 in SBR reactor 5 comprises a water inlet state, a treatment state and a water outlet state in sequence;
when a certain reaction chamber 57 is in the water inlet state, the corresponding first reaction chamber water inlet regulating valve 572 and second reaction chamber water inlet regulating valve 576 are in the open state, and the first reaction chamber water outlet regulating valve 574 is in the closed state;
when a certain reaction chamber 57 is in a processing state, the corresponding first reaction chamber water inlet regulating valve 572, second reaction chamber water inlet regulating valve 576 and first reaction chamber water outlet regulating valve 574 are all in a closed state, and the reaction chamber;
when a certain reaction chamber 57 is in the water outlet state, the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 included in the reaction chamber are in the closed state;
the control device 6 controls the states of the first reaction chamber water inlet regulating valve 572, the first reaction chamber water outlet regulating valve 574 and the second reaction chamber water inlet regulating valve 576;
the reaction cycle of the SBR reactor 5 comprises several reaction stages, in each of which the control device 6 controls at least one reaction chamber 57 in a water inlet state, at least one reaction chamber 57 in a treatment state and at least one reaction chamber 57 in a water outlet state.
The respective reaction chambers 57 are controlled to be in different states to achieve the effect that the SBR reactor 5 can be operated without intermittence in the sewage treatment. When the reaction chamber 57 is in a water inlet state, the nitrifying liquid generated in the aerobic activated sludge reactor 2 and the sewage to be treated in the water storage tank 1 flow into the reaction chamber 57; when the reaction chamber 57 is in a treatment state, the oxygen-consuming substances in the sewage to be treated reduce nitrate nitrogen in the nitrifying liquid into nitrite, and the ammonia nitrogen in the sewage to be treated and the generated nitrite react under the action of the partial denitrification-anaerobic ammonia oxidation filler to generate nitrogen; when the reaction chamber 57 is in the water outlet state, the solution in the reaction chamber 57 flows out through the first water outlet regulating pipe 575.
Preferably, the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system further comprises a secondary sedimentation tank 3 and a regulating water tank 4;
the secondary sedimentation tank 3 is used for settling aerobic activated sludge brought out along with the liquid, and the secondary sedimentation tank 3 is connected with the aerobic activated sludge reactor 2 through a secondary sedimentation tank water inlet pipe 31; the secondary sedimentation tank is connected with a water outlet pipe 11 of the first water storage tank or the aerobic activated sludge reactor 2 through a return pipe 33, and the return pipe 33 is provided with a return pump 34;
the secondary sedimentation tank 3 is connected with the regulating water tank 4 through a secondary sedimentation tank water outlet pipe 32, and the regulating water tank 4 is connected with a first SBR water inlet pipe 51 through a first SBR water inlet pump 52. The sewage to be treated is subjected to nitration reaction in the aerobic activated sludge reactor 2 to generate nitrified liquid, the nitrified liquid flows through the secondary sedimentation tank 3 and is separated in the secondary sedimentation tank 3 to obtain layered nitrified liquid and aerobic activated sludge carried out by the nitrified liquid, the aerobic activated sludge flows back to the aerobic activated sludge reactor 2 through the return pipe 33, the aerobic activated sludge is recycled, the utilization rate is effectively improved, and the cost can be saved; the nitrified liquid enters a regulating water tank 4 and then flows into an SBR reactor 5; the control device 6 controls the work of the first reaction chamber water inlet regulating valve 572, the first reaction chamber water outlet regulating valve 574 and the second reaction chamber water inlet regulating valve 576, thereby regulating the flow of the nitrified liquid entering the SBR reactor 5 and the regulating water tank 4 can play a role of temporarily storing the nitrified liquid.
Preferably, the aerobic activated sludge reactor 2 comprises a plurality of cells 24, the cells 24 are sequentially communicated end to form a cell group, and the water outlet pipe 11 of the first water storage tank and the water inlet pipe 31 of the secondary sedimentation tank are respectively communicated with two ends of the cell group; in a specific embodiment, two ends of the cell group are respectively a water inlet end and a water outlet end, the water inlet end is communicated with a water outlet pipe 11 of the first water storage tank, and the water outlet end is communicated with a water inlet pipe 31 of the secondary sedimentation tank;
two side walls of each cell 24, which are opposite to each other along the flowing direction of the liquid in the cell group, are provided with overflowing holes (not shown), and in the same cell 24, the overflowing hole of one side wall is positioned at a different height from the overflowing hole of the other side wall; each cell 24 is communicated with the adjacent cell 24 through the overflowing holes, and the overflowing holes of the two adjacent cells 24 are distributed in a staggered mode. Liquid flows into the cell group, under the guide of the overflowing holes in the same cell 24, the liquid flow path is from the overflowing hole of one side wall to the overflowing hole of the other side wall, and the positions of the overflowing holes are controlled due to the fact that the cells are communicated through the overflowing holes and are distributed in a staggered mode, liquid can fully flow in the cells 24, reaction time is prolonged, ammonia nitrogen is fully oxidized to generate nitric oxide, and the concentration of the nitric oxide is improved.
Preferably, the aerobic activated sludge reactor 2 further comprises an oxygen supply part 25, wherein the oxygen supply part comprises a plurality of aeration heads 251, a plurality of air flow regulating valves 252, a gas flow meter 254 and an air compressor 253;
the number of the aeration heads 251 and the number of the air quantity regulating valves 252 are the same as that of the cells 24, each aeration head 251 is correspondingly arranged in one cell 24, and each air quantity regulating valve 252 is connected with one aeration head 251;
a gas flow meter 254 is connected to each gas amount adjusting valve 252, and an air compressor 253 is connected in series to the gas flow meter 254. The oxygen supply part 25 is used for oxygen charging and aeration of the grid chamber 24 and providing energy required by the oxidation of ammonia nitrogen for the microorganism group in the aerobic activated sludge. Air compressor 253 is used for providing oxygen, and gas flow device 254 can detect the oxygen provided by air compressor 253, and adjust the oxygen flow through gas flow adjusting valve 252, and then introduce the oxygen into cell 24 through aerator 251.
Preferably, SBR reactor 5 further comprises a plurality of stirrers 58, the number of stirrers 58 being the same as the number of reaction chambers 57, each stirrer 58 being correspondingly disposed in one reaction chamber 57; the control device 6 is electrically connected to each of the agitators 58 and controls the on/off of the agitators 58. The stirrer 58 is used for improving the reaction efficiency of partial denitrification reaction and anaerobic ammonium oxidation in the SBR reactor 5.
Preferably, the activated sludge in the aerobic activated sludge reactor 2 is aged for more than 10 days, the dissolved oxygen concentration of the activated sludge is 1-2mg/L, the activated sludge reflux ratio is 50-100%, and the activated sludge reflux ratio is the ratio of the mass of the activated sludge returned from the reflux pipe 33 to the mass of the total activated sludge to the aerobic activated sludge reactor 2. And selecting proper activated sludge to ensure that ammonia nitrogen in the sewage to be treated can be fully oxidized into nitrate nitrogen.
Preferably, the filling ratio of the partial denitrification-anaerobic ammonium oxidation filler in the SBR reactor 5 is 15-40%. The fill ratio was adjusted to ensure that partial denitrification reaction occurred.
In a specific embodiment, the partial denitrification-anammox filler is sludge in a mixed state, which comprises a partial denitrification-anammox biofilm filler and a partial denitrification-anammox activated sludge, wherein the concentration of the partial denitrification-anammox activated sludge is 2000-4000 mg/L.
In a specific example, the pH of the solution in SBR reactor 5 is 7.0 to 8.0. If the pH value measured in SBR reactor 5 is less than 7.0, adding alkali to adjust the pH value to 7.0-8.0.
In one specific embodiment, as shown in fig. 1, the number of reaction chambers 57 is 4, respectively a first reaction chamber 57A, a second reaction chamber 57B, a reaction chamber 57 third and fourth reaction chambers 57D;
the control device 6 controls the state of the reaction chamber 57, the reaction chamber 57 comprises a water inlet state, a treatment state and a water outlet state, wherein the treatment state comprises a reaction state and a precipitation state;
in one embodiment, the process cycle for each chamber 57 is 8 hours, for example, 3 process cycles are run in each chamber 57, and the conditions of each chamber 57 between 0 and 24 are as follows:
the water inlet state:
0-2, 8-10, 16-18: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the first reaction chamber 57A are in an open state, and the first reaction chamber water outlet regulating valve 574 and the stirrer 58 are in a closed state;
2-4, 10-12, 18-20: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the second reaction chamber 57B are in an open state, and the first reaction chamber water outlet regulating valve 574 and the stirrer 58 are in a closed state;
4-6, 12-14, 20-22: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the third reaction chamber 57C are in an open state, and the first reaction chamber water outlet regulating valve 574 and the stirrer 58 are in a closed state;
6-8, 14-16, 22-24: the chamber inlet regulating valve and the second chamber inlet regulating valve 576 corresponding to the fourth reaction chamber 57D are in an open state, and the first chamber outlet regulating valve 574 and the agitator 58 are in a closed state.
Reaction state:
2-6, 10-14, 18-22: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the first reaction chamber 57A are in a closed state, the stirrer 58 is in an open state, and the first reaction chamber water outlet regulating valve 574 is in a closed state;
4-8, 12-16, 20-24: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the second reaction chamber 57B are in a closed state, the stirrer 58 is in an open state, and the first reaction chamber water outlet regulating valve 574 is in a closed state;
6-10 hours, 14-18 hours, 22-2 hours: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the third reaction chamber 57C are in a closed state, the stirrer 58 is in an open state, and the first reaction chamber water outlet regulating valve 574 is in a closed state;
8-12, 16-20, 24-4: the first reaction chamber water inlet regulating valve 572 and the second reaction chamber water inlet regulating valve 576 corresponding to the fourth reaction chamber 57D are in a closed state, the stirrer 58 is in an open state, and the first reaction chamber water outlet regulating valve 574 is in a closed state;
and (3) precipitation state:
6-7, 14-15, 22-23: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576, the stirrer 58 and the first reaction chamber water outlet regulating valve 574 corresponding to the first reaction chamber 57A are all in a closed state;
8-9, 16-17, 24-1: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576, the stirrer 58 and the first reaction chamber water outlet regulating valve 574 corresponding to the second reaction chamber 57B are all in a closed state;
10-11, 18-19, 2-3: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576, the stirrer 58 and the first reaction chamber water outlet regulating valve 574 corresponding to the third reaction chamber 57C are all in a closed state;
12-13, 20-21, 4-5: the first reaction chamber inlet water regulating valve 572, the second reaction chamber inlet water regulating valve 576, the agitator 58, and the first reaction chamber outlet water regulating valve 574 that correspond to the fourth reaction chamber 57D are all in a closed state.
And (3) drainage state:
7-8, 15-16, 23-24: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576 and the stirrer 58 corresponding to the first reaction chamber 57A are in corresponding states, and the first reaction chamber water outlet regulating valve 574 is in an open state;
9-10, 17-18, 1-2: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576 and the stirrer 58 corresponding to the second reaction chamber 57B are all in a closed state, and the first reaction chamber water outlet regulating valve 574 is in an open state;
11-12, 19-20, 3-4: the first reaction chamber water inlet regulating valve 572, the second reaction chamber water inlet regulating valve 576 and the stirrer 58 corresponding to the third reaction chamber 57C are all in a closed state, and the first reaction chamber water outlet regulating valve 574 is in an open state;
13-14, 21-22, 5-6: the first reaction chamber inlet regulating valve 572, the second reaction chamber inlet regulating valve 576 and the stirrer 58 corresponding to the fourth reaction chamber 57D are all in a closed state, and the first reaction chamber outlet regulating valve 574 is in an open state.
Example 2
This example 2 provides a nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method, which uses the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system of example 1 to perform treatment, and specifically includes the following steps:
1) guiding the sewage to be treated into a water storage tank 1;
2) the second water inlet pump 22 is started, the sewage to be treated in the water storage tank 1 enters the aerobic activated sludge reactor 2 through the water outlet pipe 11 of the first water storage tank, and in the aerobic activated sludge reactor 2, the aerobic activated sludge and ammonia nitrogen in the sewage to be treated are subjected to nitration reaction to generate nitration liquid containing nitrate nitrogen;
3) the control device 6 controls the opening or closing of the first reaction chamber water inlet regulating valve 572, the first reaction chamber water outlet regulating valve 574 and the second reaction chamber water inlet regulating valve 576 in each reaction chamber 57 individually;
measuring the oxygen equivalent COD of said oxygen consuming substance in the SBR reactor 5, calculating the ratio of the oxygen equivalent COD to the nitrate nitrogen in the SBR reactor 5, when the oxygen equivalent COD: when nitrate nitrogen is less than or equal to 2, adding a carbon source, and adjusting to oxygen equivalent COD: nitrate nitrogen is more than or equal to 2;
the control device 6 controls at least one reaction chamber 57 in the SBR reactor to be in a water inlet state, and at the moment, the nitrifying liquid generated in the aerobic activated sludge reactor 2 and the sewage to be treated in the water storage tank 1 enter the reaction chamber 57;
the control device 6 controls at least one reaction chamber 57 in the SBR reactor 5 to be in a treatment state, at the moment, oxygen consuming substances and partial denitrification-anaerobic ammonia oxidation fillers in the sewage to be treated reduce nitrate nitrogen in a nitrifying liquid into nitrite, and ammonia nitrogen and generated nitrite in the sewage to be treated react under the action of the partial denitrification-anaerobic ammonia oxidation fillers to generate nitrogen;
the control device 6 controls at least one reaction chamber 57 in the SBR reactor 5 to be in a water outlet state, and at the moment, the solution treated in the reaction chamber 57 flows out through a first reaction chamber water inlet adjusting pipe.
In the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method of the embodiment 2, a part of the sewage to be treated directly enters the SBR reactor 5 without being oxidized in the aerobic activated sludge reactor 2, so that the oxygen consumption of the system is reduced, and the energy consumption is saved; partial denitrification reaction occurs in the SBR reactor 5, only nitrate nitrogen needs to be converted into nitrite nitrogen in the reaction of the nitrate nitrogen and oxygen consumption materials, and further reduction into nitrogen is not needed, so that the demand of the oxygen consumption materials is reduced, and the oxygen consumption materials are from the sewage to be treated and can be free from introducing external carbon sources; the control device 6 is introduced, each reaction chamber 57 carries out sewage treatment in a time-sharing manner, and the sewage treatment is carried out by alternately keeping in a water inlet state, a treatment state and a water outlet state so as to continuously operate, thereby being beneficial to the efficient operation of sewage treatment.
In a specific embodiment, a carbon source such as sodium acetate can be added into the SBR reactor 5 to adjust the ratio of oxygen equivalent COD to nitrate nitrogen.
Preferably, the sewage to be treated in the water storage tank 1 enters the aerobic activated sludge reactor 2 through a water outlet pipe 11 of the first water storage tank, and the total flow rate is Q1; the sewage to be treated in the water storage tank 1 enters the SBR reactor 5 through a second SBR water inlet pipe 55, and the total flow rate of the sewage is Q2; q1; q2 is less than or equal to 1: 1. And (3) carrying out nitration reaction on the sewage to be treated with the flow rate of Q1, generating nitrate nitrogen, then entering the SBR reactor 5, reacting with oxygen-consuming substances, and controlling the proportion of Q1 and Q2 to ensure that the nitrate nitrogen can be subjected to partial denitrification reaction.
Examples3
In this embodiment 3, the effluent of a certain sewage plant is used as the sewage to be treated, and the specific water quality is as follows: the COD concentration of the oxygen consumption material is 160-240 mg/L; NH (NH)4 +-N concentration 35-60mg/L, NO2 --N≤0.2mg/L，NO3 --N≤1.0mg/L。
In this example 3, the wastewater to be treated in this example 3 was treated by using the nitrification-partial denitrification anammox wastewater treatment system in example 1 and the nitrification-partial denitrification anammox wastewater treatment method in example 2.
As shown in FIG. 1, the aerobic activated sludge reactor 2 has an effective volume of 10L and is divided into 5 cells 24. (ii) a The reaction chamber 57 of the SBR reactor 5 is made of plexiglass.
The method comprises the following specific steps:
1) starting the system: adding aerobic activated sludge into an aerobic activated sludge reactor 2, wherein the concentration of the aerobic activated sludge is 3000 mg/L; and adding part of denitrification-anaerobic ammonia oxidation filler into each reaction chamber 57 of the SBR reactor 5 to ensure that the filling ratio of the part of denitrification-anaerobic ammonia oxidation filler in each reaction chamber 57 reaches 40 percent, wherein the part of denitrification-anaerobic ammonia oxidation filler is sludge in a mixed state and comprises part of denitrification-anaerobic ammonia oxidation biomembrane filler and part of denitrification-anaerobic ammonia oxidation activated sludge, and the concentration of the added part of denitrification-anaerobic ammonia oxidation sludge is 3000 mg/L.
2) Operation: the operation method is the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method of example 2, the reaction period is 8 hours, wherein the water inlet state of the reaction chamber 57 is 2 hours, the reaction state is 4 hours, the sedimentation state is 1 hour, the water discharge state is 1 hour, and each reaction chamber 57 runs for 3 reaction periods.
After the experiment and the stable operation, the COD concentration of the oxygen consuming substances in the nitrifying liquid flowing out of the aerobic activated sludge reactor 2 is 40-60mg/L, and NO is3 --N concentration 35-57 mg/L; the COD concentration of the oxygen consuming substances in the effluent of the SBR reactor 5 is 30-50mg/L, NH4 +-N concentration less than 3.0mg/L, NO2 --N concentration less than 3.0mg/L, NO3 --N concentration less than 4.0 mg/L.
Example 4
In this example 4, the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system in the example 1 is adopted, and the sewage to be treated is treated by adopting the steps similar to the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method in the example 2, and compared with the example 2, the main technical difference is as follows:
the activated sludge age in the aerobic activated sludge reactor 2 is more than 10 days, the dissolved oxygen concentration of the activated sludge is 1mg/L, and the reflux ratio of the activated sludge is 50 percent; the filling ratio of part of denitrification-anaerobic ammonium oxidation filler in the SBR reactor 5 is 15 percent; adjusting oxygen equivalent COD: nitrate nitrogen is 2; adjusting Q1: q2 ═ 1: 1.
Example 5
In this example 5, the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment system of example 1 is adopted, and the sewage to be treated is treated by the steps similar to those of the nitrification-partial denitrification anaerobic ammonia oxidation sewage treatment method of example 2, and compared with example 2, the main technical difference is as follows:
the activated sludge age in the aerobic activated sludge reactor 2 is more than 10 days, the dissolved oxygen concentration of the activated sludge is 2mg/L, and the reflux ratio of the activated sludge is 100 percent; the filling ratio of the partial denitrification-anaerobic ammonium oxidation filler in the SBR reactor 5 is 40 percent.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A nitrify-partial denitrification anammox sewage treatment system which characterized in that:
comprises a water storage tank, an aerobic activated sludge reactor, an SBR reactor and a control device;
the water storage tank is used for storing sewage to be treated, and the sewage to be treated contains ammonia nitrogen and oxygen consumption substances; the water storage tank is provided with a first water storage tank water outlet pipe and a second water storage tank water outlet pipe;
the aerobic activated sludge reactor is connected with the water outlet pipe of the first water storage tank through a reactor water inlet pump; aerobic activated sludge is contained in the aerobic activated sludge reactor and is used for carrying out nitration reaction with the ammonia nitrogen to generate nitration liquid, and the nitration liquid contains nitrate nitrogen;
the SBR reactor comprises a first SBR water inlet pipe, a second SBR water inlet pipe and a plurality of reaction chambers which are arranged in parallel;
the first SBR water inlet pipe is communicated with the aerobic activated sludge reactor through a first SBR water inlet pump; the second SBR water inlet pipe is connected with a water outlet pipe of the second water storage tank through a second SBR water inlet pump;
each reaction chamber comprises a reaction chamber body, and a first reaction chamber water inlet regulating pipe, a first reaction chamber water outlet regulating pipe and a second reaction chamber water inlet regulating pipe which are communicated with the reaction chamber body;
the reaction chamber body is internally provided with a part of denitrification-anaerobic ammonia oxidation filler, and the part of denitrification-anaerobic ammonia oxidation filler is used for reacting with oxygen consuming substances and nitrate nitrogen in sewage to be treated to generate nitrite and reducing the nitrite into nitrogen;
a first reaction chamber water inlet adjusting pipe of each reaction chamber is communicated with the first SBR water inlet pipe, and a first reaction chamber water inlet adjusting valve is correspondingly arranged on the first reaction chamber water inlet adjusting pipe; the first reaction chamber water outlet adjusting pipe is correspondingly provided with a first reaction chamber water outlet adjusting valve;
a second reaction chamber water inlet adjusting pipe of each reaction chamber is communicated with the second SBR water inlet pipe, and a second reaction chamber water inlet adjusting valve is correspondingly arranged on the second reaction chamber water inlet adjusting pipe;
the control device is electrically connected with the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve and is used for independently controlling the opening or closing of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve in each reaction chamber.
2. The nitrification-partial denitrification anammox sewage treatment system of claim 1, wherein:
the working state of each reaction chamber in the SBR reactor sequentially comprises a water inlet state, a treatment state and a water outlet state;
when one reaction chamber is in the water inlet state, the corresponding water inlet regulating valve of the first reaction chamber and the corresponding water inlet regulating valve of the second reaction chamber are in the open state, and the water outlet regulating valve of the first reaction chamber is in the closed state;
when one reaction chamber is in the treatment state, the corresponding water inlet regulating valve of the first reaction chamber, the corresponding water inlet regulating valve of the second reaction chamber and the corresponding water outlet regulating valve of the first reaction chamber are all in a closed state;
when one reaction chamber is in a water outlet state, the corresponding water inlet regulating valve of the first reaction chamber and the corresponding water inlet regulating valve of the second reaction chamber are in a closed state, and the water outlet regulating valve of the first reaction chamber is in an open state;
the control device controls the states of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve;
the SBR reactor comprises a reaction cycle and a control device, wherein the reaction cycle of the SBR reactor comprises a plurality of reaction stages, and in each reaction stage, the control device controls at least one reaction chamber to be in a water inlet state, at least one reaction chamber to be in a treatment state and at least one reaction chamber to be in a water outlet state.
3. The nitrification-partial denitrification anammox sewage treatment system of claim 1, wherein:
the device also comprises a secondary sedimentation tank and a regulating water tank;
the secondary sedimentation tank is used for settling aerobic activated sludge brought out along with liquid, and is connected with the aerobic activated sludge reactor through a secondary sedimentation tank water inlet pipe; the secondary sedimentation tank is connected with the water outlet pipe of the first water storage tank or the aerobic activated sludge reactor through a return pipe, and the return pipe is provided with a return pump;
the secondary sedimentation tank is connected with the regulating water tank through a secondary sedimentation tank water outlet pipe, and the regulating water tank is connected with the first SBR water inlet pipe through the first SBR water inlet pump.
4. The nitrification-partial denitrification anammox sewage treatment system of claim 3, wherein:
the aerobic activated sludge reactor comprises a plurality of grid chambers, the grid chambers are sequentially communicated end to form a grid chamber group, and the water outlet pipe of the first water storage tank and the water inlet pipe of the secondary sedimentation tank are respectively communicated with two ends of the grid chamber group;
two side walls of each cell, which are opposite to each other along the flowing direction of the liquid in the cell group, are provided with overflowing holes, and in the same cell, the height of the overflowing hole of one side wall is different from that of the overflowing hole of the other side wall; each cell is communicated with the adjacent cell through the overflowing holes, and the overflowing holes of the two adjacent cells are distributed in a staggered mode.
5. The nitrification-partial denitrification anammox sewage treatment system of claim 4, wherein:
the aerobic activated sludge reactor also comprises an oxygen supply part, wherein the oxygen supply part comprises a plurality of aeration heads, a plurality of air flow regulating valves, a gas flowmeter and an air compressor;
the number of the aeration heads and the number of the air volume adjusting valves are the same as that of the grid chambers, each aeration head is correspondingly arranged in one grid chamber, and each air volume adjusting valve is connected with one aeration head; the gas flow meter is connected with each gas flow regulating valve, and the air compressor is connected with the gas flow meter.
6. The nitrification-partial denitrification anammox sewage treatment system of claim 5, wherein:
the SBR reactor also comprises a plurality of stirrers, the number of the stirrers is the same as that of the reaction chambers, and each stirrer is correspondingly arranged in one reaction chamber; the control device is electrically connected with each stirrer and controls the opening or closing of the stirrers.
7. The nitrification-partial denitrification anammox sewage treatment system of claim 3, wherein:
the activated sludge in the aerobic activated sludge reactor is aged for more than 10 days, the dissolved oxygen concentration of the activated sludge is 1-2mg/L, the activated sludge reflux ratio is 50-100%, and the activated sludge reflux ratio is the ratio of the mass of the activated sludge returned from the reflux pipe to the mass of the total activated sludge.
8. The nitrification-partial denitrification anammox sewage treatment system of claim 1, wherein:
the filling ratio of the partial denitrification-anaerobic ammonia oxidation filler in the SBR reactor is 15-40%.
9. A nitrification-partial denitrification anammox sewage treatment method characterized in that the nitrification-partial denitrification anammox sewage treatment system according to any one of claims 1 to 8 is used for treatment,
the method specifically comprises the following steps:
1) introducing sewage to be treated into the water storage tank;
2) the second water inlet pump is started, part of the sewage to be treated in the water storage tank enters the aerobic activated sludge reactor through the water outlet pipe of the first water storage tank, and in the aerobic activated sludge reactor, the aerobic activated sludge and ammonia nitrogen in the sewage to be treated are subjected to nitration reaction to generate nitration liquid containing nitrate nitrogen;
3) the control device controls the opening or closing of the first reaction chamber water inlet regulating valve, the first reaction chamber water outlet regulating valve and the second reaction chamber water inlet regulating valve in each reaction chamber independently;
measuring the oxygen equivalent COD of the oxygen consuming substance in the SBR reactor, calculating the ratio of the oxygen equivalent COD to the nitrate nitrogen in the SBR reactor, and when the oxygen equivalent COD: when nitrate nitrogen is less than or equal to 2, adding a carbon source, and adjusting to oxygen equivalent COD: nitrate nitrogen is more than or equal to 2;
the control device controls at least one reaction chamber in the SBR reactor to be in a water inlet state, and at the moment, nitrifying liquid generated in the aerobic activated sludge reactor and sewage to be treated in the water storage tank enter the reaction chamber;
the control device controls at least one reaction chamber in the SBR reactor to be in a treatment state, at the moment, oxygen-consuming substances and partial denitrification-anaerobic ammonia oxidation fillers in the sewage to be treated reduce nitrate nitrogen in the nitrifying liquid into nitrite, and ammonia nitrogen and generated nitrite in the sewage to be treated react under the action of the partial denitrification-anaerobic ammonia oxidation fillers to generate nitrogen;
the control device controls at least one reaction chamber in the SBR reactor to be in a water outlet state, and at the moment, the solution treated in the reaction chamber flows out through the water inlet adjusting pipe of the first reaction chamber.
10. The method of treating nitrifying-partially denitrifying anammox wastewater according to claim 9, wherein:
sewage to be treated in the water storage tank enters the aerobic activated sludge reactor through a water outlet pipe of the first water storage tank, and the total flow rate of the sewage is Q1; the sewage to be treated in the water storage tank enters the SBR reactor through the second SBR water inlet pipe, and the total flow rate of the sewage is Q2;
Q1：Q2≤1：1。
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