CN113772880A - A strengthening method for realizing phosphorus recovery based on DEAMOX2Device and method for nitrogen and phosphorus removal by adopting/O-BCO (anoxic-oxic) process - Google Patents

A strengthening method for realizing phosphorus recovery based on DEAMOX2Device and method for nitrogen and phosphorus removal by adopting/O-BCO (anoxic-oxic) process Download PDF

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CN113772880A
CN113772880A CN202110972050.6A CN202110972050A CN113772880A CN 113772880 A CN113772880 A CN 113772880A CN 202110972050 A CN202110972050 A CN 202110972050A CN 113772880 A CN113772880 A CN 113772880A
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tank
bco
zone
reactor
phosphorus
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彭永臻
林彦岗
孙雅雯
张丽媛
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Beijing University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
    • C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F2001/5218—Crystallization
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • 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

Abstract

A strengthening method for realizing phosphorus recovery based on DEAMOX2A device and a method for denitrification and dephosphorization by an O-BCO process belong to the technical field of sewage treatment by an activated sludge process. A DEAMOX process is introduced into the anoxic zone, ammonia nitrogen and nitrate nitrogen are removed efficiently in an energy-saving manner, the total nitrogen of effluent is further reduced, and the treatment effect of the system is improved. BCO is placed in an intermediate sedimentation tank to complete nitration reaction, and organic matters, nitrogen and phosphorus are removed in A2In the presence of/O. Most of BCO effluent flows back to A2The anoxic zone of the/O provides an electron acceptor for denitrification anaerobic ammonia oxidation and anoxic phosphorus uptake. The device A2Coupling the/O-BCO double-sludge system with DEAMOX and the induced crystallization phosphorus recovery process, and placing an induced crystallization column in A2After the anaerobic zone of the/O process, the recovery of phosphorus resources can be realized, and the phosphorus removal load of a biological system in subsequent treatment is also reduced.

Description

A strengthening method for realizing phosphorus recovery based on DEAMOX2Device and method for nitrogen and phosphorus removal by adopting/O-BCO (anoxic-oxic) process
Technical Field
The invention relates to a method for strengthening A based on DEAMOX for realizing phosphorus recovery2A device and a method for denitrification and dephosphorization by an O-BCO process belong to the technical field of sewage treatment by an activated sludge process and are suitable for the fields of domestic sewage treatment and phosphorus resource recovery.
Background
The problems of nitrogen and phosphorus are one of the main problems of water pollution prevention and control at present. The over-standard discharge of nitrogen and phosphorus is a main factor causing water eutrophication, and the sewage needs to be subjected to advanced treatment to control the water eutrophication, so that the concentration of the nitrogen and phosphorus in the treated water is controlled within a standard range. However, the most obvious characteristic of municipal sewage in China is that C/N is low, and the lack of organic matters makes the sewage treatment system difficult to realize better denitrification and dephosphorization effects. In addition, the global problem of phosphorus resource shortage exists, the sewage is rich in phosphorus, and how to efficiently recycle the phosphorus is an urgent problem to be solved.
A2the/O-BCO process adopts a double-sludge operation mode, solves the problem of mutual contradiction between the sludge ages of nitrifying bacteria and phosphorus accumulating bacteria to a certain extent, and has the advantages of realizing 'one-carbon dual-purpose', reducing the requirement on carbon sources, reducing the yield of residual sludge, saving 30 percent of energy consumption and the like. However, A is2the/O-BCO process also has the defects of high nitrate nitrogen content in effluent, unstable synchronous nitrogen and phosphorus removal effect and the like, and needs to be further optimized.
Anaerobic ammonia oxidation (Anammox) by anaerobic ammonia oxidizing bacteria in the anoxic condition of nitrite Nitrogen (NO)2 --N) Ammonia Nitrogen (NH) as an Electron acceptor4 +-N) a biological reaction process for direct conversion to nitrogen. Compared with the traditional activated sludge method, the method has higher denitrification efficiency.
NO production based on denitrification process2 -N provides a substrate for anaerobic ammonia OXidation, a denitrification ammonia OXidation (DEAMOX) process is established by combining denitrification and anaerobic ammonia OXidation processes, the application range of the anaerobic ammonia OXidation process is further expanded, and a new technology with certain application potential is provided for sewage denitrification.
Disclosure of Invention
At present A2the/O-BCO process can realize better synchronous denitrification and dephosphorization effects. But China has higher requirements on urban sewage treatment plants. Furthermore, A2the/O-BCO process has the defects that the effluent has high nitrate nitrogen content,the denitrification and dephosphorization effect is unstable, and the like. The invention utilizes A2The wastewater containing ammonia nitrogen and nitrate nitrogen generated by the/O-BCO process is combined with the DEAMOX process and coupled with the induced crystallization phosphorus recovery process, so that the total nitrogen in the wastewater is further removed, the phosphorus element is recycled, and the sludge yield is reduced.
The technical scheme of the invention is as follows:
a strengthening method for realizing phosphorus recovery based on DEAMOX2The device for removing nitrogen and phosphorus by the O-BCO process is characterized in that: comprises a raw water tank, an anaerobic reactor, a sedimentation tank, a dosing tank, a blow-off tank, an induced crystallization column, an anoxic zone, an aerobic zone, an intermediate sedimentation tank, an intermediate water tank, a BCO reactor, a sedimentation zone and a water outlet tank;
the sludge outlet of the intermediate sedimentation tank and the outlet of the raw water tank are respectively connected with the inlet of the anaerobic reactor, the outlet of the anaerobic reactor is connected with the sedimentation tank, the water outlet of the sedimentation tank is connected with the inlet of the stripping tank, and the stripping tank and the MgCl are arranged2The dosing boxes are respectively connected with the inlets of the induced crystallization columns; the water outlet of the induced crystallization column, the sludge outlet of the sedimentation tank and the water outlet of the water outlet tank are respectively connected with an anoxic zone, and an aerobic zone is respectively connected with the anoxic zone and the intermediate sedimentation tank; the intermediate water tank is respectively connected with the water outlet of the intermediate sedimentation tank and the BCO reactor, and aerobic MBBR filler is filled in the BCO reactor; the sedimentation zone is respectively connected with the BCO reactor and the water outlet tank.
The device is provided with two air blowers, wherein the air blower I is respectively connected with the BCO reactor and the aerobic zone through a flow meter, and the BCO reactor and the aerobic zone are respectively provided with an aeration head. And the blower II is respectively connected with the stripping tank and the induced crystallization column through a flowmeter I and a flowmeter II, and the stripping tank and the induced crystallization column are respectively provided with an aeration head.
Furthermore, the anaerobic and anoxic zone is provided with a stirrer, the anoxic zone is provided with anoxic filler, and the sedimentation zone is provided with an overflow port.
A strengthening method for realizing phosphorus recovery based on DEAMOX2The use method of the device for denitrification and dephosphorization in the/O-BCO process is characterized by comprising the following steps:
1) raw water in a raw water tank enters an anaerobic reactor through a water inlet pump, and simultaneously enters returned sludge returned from an intermediate sedimentation tank through a sludge return pump, denitrifying phosphorus accumulating bacteria (DPAOs) synthesize internal carbon Sources (PHAs) by using easily degradable organic matters in the raw water and store the internal carbon sources in cell bodies, most of the organic matters are removed, and phosphorus is released at the same time; the sludge age SRT is controlled to be 20 days, the anaerobic reaction time is 1-2h, and the sludge concentration is 4000-;
2) the sludge-water mixture in the anaerobic reactor enters a sedimentation tank for sludge-water separation, and supernatant fluid with 70 percent of volume enters a stripping tank for CO2Blowing off, wherein the concentration of dissolved oxygen is controlled to be 3-4mg/L, and the blowing off time is 1 h; the rest 30 percent of supernatant fluid enters an anoxic zone together with sludge through a sludge pump;
3) the solution after stripping was mixed with MgCl from the dosing tank2The solution enters an induced crystallization column together, the Mg/P molar ratio is controlled to be 1-1.2, a blower II and a flow meter II are opened, the concentration of dissolved oxygen in the induced crystallization column is controlled to be 6-7Mg/L, quartz sand seed crystals are placed in a reaction zone of the induced crystallization column, the particle size is 150-200 meshes, the concentration is 30000-40000Mg/L, the released phosphorus is recovered in the form of magnesium ammonium phosphate (struvite), and the generated crystalline phosphorus is taken out;
4) the supernatant after the reaction enters an anoxic zone, and is subjected to denitrification dephosphorization and partial anaerobic ammonia oxidation reaction in the anoxic zone together with sludge with the supernatant from the sedimentation tank and nitrifying liquid from an effluent water tank, so that nitrogen and phosphorus are synchronously removed; then enters an aerobic zone, the concentration of dissolved oxygen in the aerobic zone is controlled to be 3-4mg/L, further phosphorus is absorbed, and N generated in the denitrification process is blown off2；
The effluent of the aerobic zone enters an intermediate sedimentation tank for mud-water separation, the effluent enters an intermediate water tank, sludge enters an anaerobic reactor through a sludge reflux pump, and the sludge reflux ratio is 100%;
5) the effluent of the intermediate sedimentation tank of the intermediate water tank enters a BCO reactor through an intermediate water inlet pump for complete nitration reaction, a suspended filler is arranged in the BCO reactor, the material is polypropylene, and the specific surface area is 900-2/m3The filling rate is 40-45%, and the dissolved oxygen concentration is changed by adjusting the flowmeter IIIThe filler is in a fluidized state, and the hydraulic retention time is 1.5-2 h;
6) and the BCO effluent finally enters a settling zone, the supernatant enters an effluent water tank through an overflow port, 75% of effluent enters an anoxic zone through a nitrifying liquid reflux pump to provide an electron acceptor for denitrifying phosphorus removal, the rest 25% of effluent is directly discharged, and the fallen biomembrane is discharged at the bottom of the settling zone.
Aiming at the inherent defects of the existing denitrification dephosphorization process, the advantages of anaerobic ammonia oxidation and the requirement of phosphorus resource recovery, the invention provides a method for realizing phosphorus recovery based on DEAMOX strengthening A2A device for removing nitrogen and phosphorus by an O-BCO process, which comprises a2Coupling the/O-BCO double-sludge system with DEAMOX and the induced crystallization phosphorus recovery process, and placing an induced crystallization column in A2After the anaerobic zone of the/O process, the recovery of phosphorus resources can be realized, and the phosphorus removal load of a biological system in subsequent treatment is also reduced. A DEAMOX process is introduced into the anoxic zone, ammonia nitrogen and nitrate nitrogen are removed efficiently in an energy-saving manner, the total nitrogen of effluent is further reduced, and the treatment effect of the system is improved. After the BCO is placed in the intermediate sedimentation tank, the main purpose is to complete the nitration reaction, and the removal of organic matters, nitrogen and phosphorus is carried out in A2In the presence of/O. Most of BCO effluent flows back to A2The anoxic zone of the/O provides an electron acceptor for denitrification anaerobic ammonia oxidation and anoxic phosphorus uptake. Compared with the prior art, the method of the invention has the following advantages:
1) aiming at the problems of low C/N of the current inlet water, unstable nitrogen and phosphorus removal efficiency, large sludge yield, high operation energy consumption, low resource recovery utilization rate and the like, the invention couples the recovery of the crystallized phosphorus and the denitrification phosphorus removal, thereby not only solving the problem of unstable low C/N sewage treatment effect caused by the lack of a carbon source, but also realizing the reduction and the resource utilization of the sludge.
2) The system introduces DEAMOX technology into A2the/O-BCO system utilizes anaerobic ammonia oxidation to further remove ammonia nitrogen and nitrate nitrogen in an anoxic zone, so that the problem of unstable denitrification dephosphorization process can be solved, deep denitrification can be realized, the total nitrogen of effluent is reduced, and higher effluent requirements are met.
3) The system is additionally provided with a phosphorus recovery unit on the basis of a DEAMOX (denitrifying phosphorus removal) coupling process, the denitrifying phosphorus removal coupling anaerobic ammonia oxidation and induced crystallization phosphorus recovery are coupled together, a phosphorus chemical outlet is increased, the efficient removal of phosphorus is realized, and the sludge discharge is reduced.
4) When pollutants are removed, the system not only reduces the dephosphorization load of the biological system, but also realizes the recovery of phosphorus resources, and unifies sewage treatment and resource utilization.
Drawings
FIG. 1 is a process for strengthening A based on DEAMOX to realize phosphorus recovery2A schematic diagram of a nitrogen and phosphorus removal device of an O-BCO process;
in the figure: 1-raw water tank, 2-anaerobic reactor, 3-sedimentation tank, 4-stripping tank and 5-MgCl2The system comprises a dosing tank, 6-an induced crystallization column, 7-an anoxic zone, 8-an aerobic zone, 9-an intermediate sedimentation tank, 10-an intermediate water tank, 11-a BCO reactor, 12-a sedimentation zone, 13-a water outlet tank, 14-a water inlet pump, 15-a sludge pump, 16-an intermediate water inlet pump, 17-a sludge reflux pump, 18-a nitrifying liquid reflux pump, 19-a blower I, 20-a blower II, 21-a stirrer, 22-a flowmeter I, 23-a flowmeter II and 24-a flowmeter III.
Detailed Description
1. As shown in the figure, the method for realizing phosphorus recovery based on DEAMOX strengthening A2The device for removing nitrogen and phosphorus by the O-BCO process comprises:
the raw water tank (1) is connected with the anaerobic reactor (2) through a water inlet pump (14), then is connected with the sedimentation tank (3), and then is sequentially connected with the stripping tank (4), the induced crystallization column (5), the AO reactor, the intermediate sedimentation tank (9), the intermediate water tank (10), the BCO reactor (11), the sedimentation zone (12) and the water outlet tank (13) in sequence, and the BCO outlet water is used as the final treated outlet water; the AO reactor comprises an anoxic zone (7) and an aerobic zone (8) in sequence; the aerobic tank (8) is connected with the intermediate sedimentation tank (9) through an overflow port; the effluent of the intermediate sedimentation tank (9) flows into an intermediate water tank (10) and enters a BCO (11) from the intermediate water tank (10); aerobic filler is arranged in the BCO (11), and the effluent of the aerobic filler enters a final water tank (13) through a BCO water outlet; the water stored in the final water tank (13) returns to the anoxic zone (7) through a nitrifying liquid reflux pump (18); supernatant of the sedimentation tank enters a stripping tank, and bottom sludge-water mixed liquor enters an anoxic zone through a sludge pump; sludge-water mixed liquor at the bottom of the intermediate sedimentation tank (9) enters the anaerobic zone (2) through a sludge return pump (17), and the other part of sludge is discharged; an anoxic filler is arranged in the anoxic zone (7).
An aeration head is arranged at the bottom of the stripping tank (4), and the dissolved oxygen concentration is controlled through an air blower II (20) and a flow meter I (22). The induced crystallization column 6 consists of a reaction zone, a buffer zone, a precipitation zone and a water outlet, an aeration head II is arranged at the bottom of the induced crystallization column 6, and the control of the concentration of the dissolved oxygen is realized through an air blower II (20) and a flowmeter II (23). Taking out the crystal in the induced crystallization column (6) from the precipitation zone, and enabling the solution to enter an anoxic zone (7) of the AO reactor from a water outlet. The AO reactor is composed of an anoxic zone (7) and an aerobic zone (8) which are connected in sequence.
The anaerobic reactor (2) and the AO anoxic zone (7) are both provided with a stirring device (21); a fan (20) is connected to the aeration device in the aerobic zone and the aeration device in the BCO (11), and the fan simultaneously aerates the aerobic zone (8) and the BCO (11) through flow meters.
A suspended filler is arranged in the BCO reactor (11) and is made of polypropylene, and dissolved oxygen is regulated and controlled by a blower I (20) and a flowmeter III (26) to enable the filler to be in a fluidized state, so that the substrate is ensured to be fully contacted with microorganisms; the sedimentation zone (12) is provided with an overflow port.
MgCl2The concentration of the solution is 250mg/L, the main function is to provide magnesium element for forming magnesium ammonium phosphate (struvite), the volume of an induced crystallization column is 10L, and the induced crystallization column is divided into a reaction zone, a buffer zone, a precipitation zone and a water blowing port; the bottom of the induced crystallization column is provided with an aeration head, the concentration of dissolved oxygen is controlled to be 6-7mg/L, quartz sand seed crystals with the particle size of 150-200 meshes and the concentration of 30000-40000mg/L are placed in the induced crystallization column, the induced crystallization column mainly has the function of recovering released phosphorus element in the form of magnesium ammonium phosphate (struvite), and the generated crystallized phosphorus is taken out.
2. A strengthening method for realizing phosphorus recovery based on DEAMOX2The use method of the nitrogen and phosphorus removal device of the/O-BCO process comprises the following steps:
1) municipal sewage enters an anaerobic reactor (2) together with return sludge sent by a sludge return pump (17) through a water inlet pump (14) in a raw water tank (1) for anaerobic phosphorus release, denitrifying phosphorus accumulating bacteria (DPAOs) utilize easily degradable organic matters in the raw water to synthesize internal carbon Sources (PHAs) and store the internal carbon sources in cells, and most of the organic matters are removed. The sludge reflux ratio is 100 percent, the sludge age SRT is controlled to be about 20 days, the anaerobic reaction time is 1-2h, and the sludge concentration is 4000-5000 mg/L.
2) The mixed liquid enters a sedimentation tank (3) for mud-water separation, the sedimentation time is 1h, and 70 percent of supernatant liquid enters an air stripping tank (4) for CO separation2The dissolved oxygen concentration is controlled to be about 6-7mg/L by using an air blower I (19) and a flowmeter I (22), and the air stripping time is 1 h. The residual sludge-water mixture is pumped into an anoxic zone (7) of the AO reactor through a sludge pump (15).
3) The supernatant after stripping enters an induced crystallization column (6) and MgCl from a dosing tank (5) simultaneously2Controlling the Mg/P molar ratio of the solution to be 1-1.2, opening a blower II (20) to supply gas to the crystallization column through an aeration head at the bottom of the induced crystallization column (6), controlling the dissolved oxygen concentration to be 6-7Mg/L by using a flow meter II (23), placing quartz sand seed crystals in a reaction zone of the induced crystallization column (6), wherein the particle size is 150-200 meshes and the concentration is 30000-40000Mg/L, recovering phosphorus in the supernatant in the form of magnesium ammonium phosphate (struvite), and taking out the generated crystalline phosphorus.
4) The supernatant after the reaction, the muddy water mixture from the anaerobic zone (2) and the nitrified liquid from the BCO reactor (11) enter an anoxic zone (7) of the AO reactor, and the DPAOs are treated by NO3 -N is a final electron acceptor, PHAs is an electron donor, and synchronous nitrogen and phosphorus removal is realized; NO produced by ANAMMOX by anoxic zone denitrification2 -N is an electron acceptor, and ammonia nitrogen is removed; the reflux ratio of nitrifying liquid in the anoxic zone is 300 percent, and the anoxic reaction time is 9 hours;
5) the mixed liquor enters an aerobic zone (8) from the anoxic zone (7), at this stage, the residual COD in the mixed liquor is degraded, the residual phosphorus is absorbed, and the HRT of the aerobic zone (8) is controlled to be 1-1.5 h;
6) mixed liquor enters a middle sedimentation tank (9) from an overflow port of an aerobic zone (8) to realize mud-water separation, the effluent of the middle sedimentation tank (9) enters an intermediate water tank (10), the reflux ratio of sludge in the middle sedimentation tank is 100 percent, the returned sludge enters an anaerobic reactor to release phosphorus, and the rest part is used as residual sludge and is directly discharged out of the system;
7) effluent storage of intermediate sedimentation tankIn an intermediate water tank, enters a BCO reactor (11) through an intermediate water inlet pump (16) for complete nitration, is internally provided with a polypropylene suspension filler with a specific surface area of 900-2/m3The filling rate is 40-45%; and adjusting the flow meter III (24) to enable the three-grid packing to be in a fluidized state, and enabling the hydraulic retention time to be 2-3 h.
8) BCO effluent flows into a settling zone (12) for mud-water separation, supernatant enters an effluent water tank (13) through an overflow port, 75% of effluent enters an anoxic zone (7) of an AO reactor through a nitrifying liquid reflux pump (18) to provide substrates for denitrifying phosphorus removal and DEAMOX, and the rest is directly discharged; the detached biofilm is discharged directly at the bottom of the settling zone (12).

Claims (2)

1. A strengthening method for realizing phosphorus recovery based on DEAMOX2The device for denitrification and dephosphorization in the/O-BCO process is characterized by comprising a raw water tank (1), an anaerobic reactor (2), a sedimentation tank (3), a stripping tank (4), a dosing tank (5), an induced crystallization column (6), an anoxic zone (7), an aerobic zone (8), an intermediate sedimentation tank (9), an intermediate water tank (10), a BCO reactor (11), a sedimentation zone (12) and a water outlet tank (13);
a water inlet pump (14) is connected with the raw water tank (1) and the anaerobic reactor (2), then connected with the sedimentation tank (3), then connected with the stripping tank (4), and the stripping tank (4) and MgCl2The dosing tank (5) is connected with an inlet of the induced crystallization column (6), then is connected with the A/O reactor, then is connected with the intermediate sedimentation tank (9), then is connected with the BCO reactor (11), and finally is used for treating the final effluent from a water outlet of the sedimentation zone (12); the A/O reactor sequentially comprises an anoxic zone (7) and an aerobic zone (8); the aerobic zone (8) is connected with the intermediate sedimentation tank (9) through an overflow port; the effluent of the intermediate sedimentation tank (9) enters a BCO reactor (12) from an intermediate water tank (10) through a BCO water inlet pump (11); aerobic filler is arranged in the BCO reactor (12), and the effluent of the settling zone enters an effluent water tank (13) through a BCO water outlet; the effluent water tank (13) is connected with an anoxic zone (7) through a nitrifying liquid reflux pump (18), and anoxic filler is arranged in the anoxic zone; the bottom of the sedimentation tank is connected with an anoxic zone of the A/O reactor by a sludge pump, and the bottom of the intermediate sedimentation tank (9) is connected with an anaerobic reactor (2) by a sludge reflux pump (17);
the anaerobic zone (2) and the anoxic zone (7) are both provided with a stirring device (21); a fan (19) is connected to the stripping tank (4) and an aeration device at the bottom of the induced crystallization column (6) for aeration; meanwhile, a fan (20) is connected to the aerobic zone and an aeration device in the BCO reactor (11) to aerate the aerobic zone and the BCO reactor;
the sludge outlet of the intermediate sedimentation tank (9) and the outlet of the raw water tank (1) are respectively connected with the inlet of the anaerobic reactor (2), the outlet of the anaerobic reactor (2) is connected with the sedimentation tank (3), the water outlet of the sedimentation tank (3) is connected with the inlet of the stripping tank (4), the stripping tank and MgCl are respectively connected with the inlet of the stripping tank2The dosing boxes (5) are respectively connected with the inlets of the induced crystallization columns (6).
2. The method of claim 1, comprising the steps of:
1) raw water in a raw water tank (1) enters an anaerobic reactor (2) through a water inlet pump (14) and return sludge sent by an intermediate sedimentation tank (9) through a sludge return pump (17), denitrifying phosphorus removal bacteria DPAOs synthesize internal carbon sources PHAs by using COD in the raw water, and simultaneously carry out anaerobic phosphorus release, the hydraulic retention time HRT of the anaerobic reactor (2) is controlled to be 1-2h, the sludge age SRT is controlled to be 20 days, the sludge concentration is 4000 and 5000mg/L, and the raw water and the return sludge are fully mixed and reacted through a stirrer (21);
2) the mixed liquid enters a sedimentation tank (3) for mud-water separation, the sedimentation time is 1h, and 70 percent of supernatant liquid enters an air stripping tank (4) for CO separation2The air blower II (19) and the flowmeter I are turned on for aeration, supernatant with 30 percent volume enters an anoxic zone (7) together with sludge through a sludge pump (15), the concentration of dissolved oxygen is controlled to be 3-4mg/L, and the air-stripping time is 1 h;
3) the supernatant after stripping enters an induced crystallization column (6) and MgCl from a dosing tank (5) simultaneously2Controlling the molar ratio of Mg/P in the solution to be 1-1.2, placing quartz sand in a reaction area of an induced crystallization column (6), controlling the concentration of dissolved oxygen to be 6-7Mg/L, and recovering released phosphorus in the form of magnesium ammonium phosphate;
4) supernatant after the reaction of the induced crystallization column enters an anoxic zone (7) of the A/O reactor, simultaneously, muddy water mixture from a sedimentation tank (3) and nitrified liquid from an effluent water tank (13) enter, and the DPAOs take PHAs as electron donors and nitrate nitrogen NO as NO donors3 -N isThe electron acceptor carries out denitrification to absorb phosphorus; anaerobic ammonia oxidation bacteria carry out anaerobic ammonia oxidation reaction by taking ammonia nitrogen and nitrite nitrogen generated in the denitrification process as electron acceptors; HRT of the anoxic zone (7) is controlled to be 6-8 h;
5) the mixed liquid enters an aerobic zone (8) to further absorb phosphorus and simultaneously blow off N generated in the denitrification process2The sludge-water separation is convenient, the HRT of the aerobic zone (8) is controlled to be 1-2h, and the concentration of dissolved oxygen is controlled to be 3-4 mg/L;
6) mixed liquor enters a middle sedimentation tank (9) from an overflow port of an aerobic zone (5) to realize mud-water separation, effluent of the middle sedimentation tank (9) enters an intermediate water tank (10), precipitated sludge flows back to an anaerobic reactor through a sludge reflux pump, and the sludge reflux ratio is 100%;
7) the water containing ammonia nitrogen is accumulated in the middle water tank (10) and enters the BCO reactor (11) through the BCO water inlet pump, aerobic polypropylene hollow ring suspension packing is arranged in the BCO reactor, the packing ratio is 40-45 percent, and the specific surface area is 900-2/m3Adjusting the flow meter III to ensure that the filler is in a fluidized state, and keeping the hydraulic retention time for 2-3h to complete the oxidation of ammonia nitrogen;
8) and finally, the supernatant enters a settling zone (12), the supernatant enters an effluent water tank (13) through an overflow port, 75% of effluent enters an anoxic zone (7) through a nitrifying liquid reflux pump (18) to provide an electron acceptor for denitrifying phosphorus removal and DEAMOX, the rest is directly discharged, and the fallen biomembrane is discharged at the bottom of the settling zone (12).
CN202110972050.6A 2021-08-24 2021-08-24 A strengthening method for realizing phosphorus recovery based on DEAMOX2Device and method for nitrogen and phosphorus removal by adopting/O-BCO (anoxic-oxic) process Pending CN113772880A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
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CN107253762A (en) * 2017-07-05 2017-10-17 扬州大学 A kind of short-cut denitrification dephosphorization couples the quick start method of Anammox
CN107758866A (en) * 2017-12-01 2018-03-06 扬州市洁源排水有限公司 One kind realizes AAO BCO technique deep denitrifications dephosphorization and resource recovering system and method
CN108545887A (en) * 2018-04-20 2018-09-18 北京工业大学 The method of sulfide type DEAMOX postposition anoxics filter tank denitrification and desulfurization hydrogen based on AAO-BAF Process for Effluent
CN108862582A (en) * 2018-07-04 2018-11-23 北京工业大学 One kind being based on part Anammox biomembrane A2The method of the bis- sludge system denitrogenation dephosphorizings of/O-IFAS-MBR
CN109626569A (en) * 2018-12-24 2019-04-16 扬州大学 A kind of AIC-AO-BCO system and its application method for realizing phosphorus recycling
CN109761454A (en) * 2019-03-20 2019-05-17 哈尔滨工业大学（威海） A method of advanced nitrogen is realized by denitrifying ammoxidation MBBR technique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107253762A (en) * 2017-07-05 2017-10-17 扬州大学 A kind of short-cut denitrification dephosphorization couples the quick start method of Anammox
CN107758866A (en) * 2017-12-01 2018-03-06 扬州市洁源排水有限公司 One kind realizes AAO BCO technique deep denitrifications dephosphorization and resource recovering system and method
CN108545887A (en) * 2018-04-20 2018-09-18 北京工业大学 The method of sulfide type DEAMOX postposition anoxics filter tank denitrification and desulfurization hydrogen based on AAO-BAF Process for Effluent
CN108862582A (en) * 2018-07-04 2018-11-23 北京工业大学 One kind being based on part Anammox biomembrane A2The method of the bis- sludge system denitrogenation dephosphorizings of/O-IFAS-MBR
CN109626569A (en) * 2018-12-24 2019-04-16 扬州大学 A kind of AIC-AO-BCO system and its application method for realizing phosphorus recycling
CN109761454A (en) * 2019-03-20 2019-05-17 哈尔滨工业大学（威海） A method of advanced nitrogen is realized by denitrifying ammoxidation MBBR technique

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Application publication date: 20211210