CN113697953B - Realizing A based on gradually reducing suspended sludge concentration 2 Device and method for quick in-situ starting of/O part anaerobic ammonia oxidation process - Google Patents

Realizing A based on gradually reducing suspended sludge concentration 2 Device and method for quick in-situ starting of/O part anaerobic ammonia oxidation process Download PDF

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CN113697953B
CN113697953B CN202110919734.XA CN202110919734A CN113697953B CN 113697953 B CN113697953 B CN 113697953B CN 202110919734 A CN202110919734 A CN 202110919734A CN 113697953 B CN113697953 B CN 113697953B
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bacteria
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CN113697953A (en
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彭永臻
赵洋
刘骐语
李健伟
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

Realizing A based on gradually reducing suspended sludge concentration 2 Anaerobic partial flow/OAn ammonia oxidation process rapid in-situ starting device and method belong to the field of sewage treatment. 1) The anaerobic ammonia oxidizing bacteria are provided with good environment for retention and growth by adding a suspension filler without a film in an anaerobic/anoxic zone; 2) The denitrifying bacteria gradually enriched on the anaerobic/anoxic biomembrane have short-cut denitrification characteristics, and can provide necessary substrate nitrite nitrogen for the anaerobic ammonia oxidizing bacteria; 3) And finally, reducing the concentration of the suspended sludge to enable denitrifying bacteria on the anaerobic/anoxic biological film to compete for more substrates, further providing more substrates of nitrite nitrogen for the anaerobic ammonia oxidation bacteria, weakening the competitiveness of the whole-course denitrifying bacteria in the suspended sludge to the nitrite nitrogen, and promoting the growth of the anaerobic ammonia oxidation bacteria together to enrich the anaerobic ammonia oxidation bacteria. And adding a suspension filler without a film in an aerobic zone to enrich nitrifying bacteria on the aerobic biomembrane. The invention realizes A 2 And the rapid in-situ start of the anaerobic ammonia oxidation process of the part/O saves energy and reduces consumption.

Description

Realizing A based on gradually reducing suspended sludge concentration 2 Device and method for quick in-situ starting of/O part anaerobic ammonia oxidation process
Technical Field
The invention relates to a sewage deep denitrification and dephosphorization device and a sewage deep denitrification and dephosphorization method, which belong to the technical field of sewage treatment by an activated sludge process, and are suitable for the technical field of sewage treatment such as standard improvement of newly built sewage plants and old sewage plants, municipal sewage and industrial wastewater treatment and the like.
Background
At present, the municipal sewage treatment plant widely adopts the traditional nitrification and denitrification technology to carry out biological denitrification. Sufficient aeration is required during the nitration process, which consumes a large amount of electrical energy. The urban sewage C/N in China is relatively low, so that sufficient carbon sources are needed to be provided in the denitrification process to achieve a better denitrification effect. In addition, in the traditional activated sludge process denitrification and dephosphorization process, nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria are contradicted and competing in organic load, sludge age and carbon source requirements, and high-efficiency removal of nitrogen and phosphorus is difficult to obtain in the same system at the same time, so that the application of the biological dephosphorization and denitrification technology is hindered. Therefore, the novel denitrification and dephosphorization process technology is found to have great significance for energy conservation and consumption reduction of sewage treatment plants.
Anaerobic ammoxidation is used as a novel denitrification technology, and has the advantages of saving aeration energy consumption, organic carbon source, low sludge yield and the like. At present, the anaerobic ammonia oxidation technology is mainly applied to high ammonia nitrogen and high temperature wastewater treatment such as sludge digestion liquid, and if the anaerobic ammonia oxidation technology is applied to urban main stream domestic wastewater treatment, the energy neutralization or output of a sewage treatment plant can be expected to be realized. The main bottleneck of the application of the anaerobic ammonia oxidation technology in the mainstream sewage treatment is the enrichment and retention of anaerobic ammonia oxidation bacteria, however, the realization of anaerobic ammonia oxidation by inoculating anaerobic ammonia oxidation mature sludge in practical sewage treatment plants is impractical, so that the strategy of quickly enriching anaerobic ammonia oxidation bacteria in situ is sought in the mainstream urban sewage, and the method has great significance.
Researches show that the biological film in the anaerobic/anoxic zone can effectively retain anaerobic ammonia oxidizing bacteria, and denitrifying bacteria on the biological film can perform short-cut denitrification to reduce nitrate nitrogen into nitrite nitrogen to provide substrate nitrite for anaerobic ammonia oxidation. Therefore, by adding the suspension filler into anaerobic/anoxic and adopting a certain strategy to quickly enrich anaerobic ammonia oxidation bacteria in situ, the practical application of the anaerobic ammonia oxidation technology in urban mainstream sewage treatment is hopefully promoted.
Disclosure of Invention
Aiming at the problem that anaerobic ammonia oxidation bacteria are difficult to enrich and stay in an actual sewage treatment plant, so that the application of an anaerobic ammonia oxidation technology in actual mainstream sewage is limited, the invention provides a method for realizing A based on gradually reducing the concentration of suspended sludge 2 A device and a method for fast in-situ start-up of an anaerobic ammonia oxidation process of a/O part. The method adds suspended filler in the anaerobic/anoxic zone to provide good environment for the anaerobic ammonia oxidizing bacteria to stay and grow. The denitrifying bacteria on the anaerobic/anoxic biological film have short-cut denitrification characteristics, can reduce nitrate nitrogen into nitrite nitrogen, provide substrate nitrite for the anaerobic ammonia oxidizing bacteria, and promote the growth of the anaerobic ammonia oxidizing bacteria on the anaerobic/anoxic biological film. In the process of reducing the suspended sludge, the denitrifying bacteria on the anaerobic/anoxic biological film can compete for more substrates, so that more substrates of nitrite nitrogen are provided for the anaerobic ammonia oxidation bacteria, and meanwhile, the competitiveness of the whole-course denitrifying bacteria in the suspended sludge to the nitrite nitrogen is weakened, and the growth of the anaerobic ammonia oxidation bacteria is promoted together to enrich the anaerobic ammonia oxidation bacteria. Meanwhile, suspended filler is added into the aerobic zone to promote nitrifying bacteria to fill in the aerobic biomembraneThe enrichment ensures that the nitrification performance of the aerobic zone is kept stable in the process of reducing the concentration of suspended sludge. Finally, under the condition of ensuring the relatively stable water outlet of the bioreactor system, the rapid in-situ start of the anaerobic ammonia oxidation process of the continuous flow urban main stream sewage part is realized.
Realizing A based on gradually reducing suspended sludge concentration 2 The device for quick in-situ starting of the anaerobic ammonia oxidation process of the/O part mainly comprises a raw water tank (1) and an A 2 The O reaction device (3) and the secondary sedimentation tank (11) are sequentially connected to form A 2 The O reaction device (3) sequentially comprises an anaerobic zone (4), an anoxic zone (5) and an aerobic zone (6); the raw water tank (1) is connected with the anaerobic zone (4) through the water inlet pump (2), the anaerobic zone (4) is connected with the anoxic zone (5), the anoxic zone (5) is connected with the aerobic zone (6), and the overflow holes are arranged up and down in a staggered manner according to the water flow direction and are connected with all the cells; the aerobic zone (6) is connected with the water tank through A 2 the/O overflow pipe (10) is connected with the secondary sedimentation tank (11); the bottom of the secondary sedimentation tank (11) is connected with the anaerobic zone (4) through a sludge reflux pump (17); the last cell of the aerobic zone (6) is connected with the first cell of the anoxic zone (5) by a nitrifying liquid reflux pump (16); an agitator (7) is arranged in the anaerobic zone (4) and the anoxic zone (5) and is used for mixing the mixed liquid and fluidizing the suspension carrier (8); an aeration system of an air compressor (13), a gas flowmeter (14) and an aeration head (15) is arranged in the aerobic zone (6) for aeration and fluidization of a suspension carrier (9) in the aerobic zone; polyethylene filler (8) with the specific surface area of 500m2/m3 and the diameter of 25 mm is placed in the anoxic zone (5), the filling ratio is 10-30%, a growth carrier is provided for anaerobic ammonia oxidizing bacteria and denitrifying bacteria, and the anaerobic ammonia oxidizing bacteria and the denitrifying bacteria are enriched; polyethylene filler (9) with the specific surface area of 500m2/m3 and the diameter of 25 mm is placed in the aerobic zone (6), the filling ratio is 20-40%, a growth carrier is provided for nitrifying bacteria, and nitrifying bacteria are enriched.
Realizing A based on gradually reducing suspended sludge concentration 2 The device and the method for quickly and in-situ starting the anaerobic ammoxidation process of the O part are characterized by comprising the following steps:
stage one: the method is regulated to operate for 20 to 30 days according to the following operation and control strategy when the suspended sludge concentration is 3000 to 4000mg/L, so that a part of activated sludge microorganisms are primarily attached and trapped on the filler;
stage two: on the basis of original residual sludge discharge, the residual sludge discharge amount is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 2000-3000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 2000-3000 mg/L, and adjusting the control strategy to operate for 30-60 d according to the following operation time;
stage three: on the basis of the second stage, the discharge amount of the residual sludge is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 1000-2000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 1000-2000 mg/L, and adjusting the control strategy to operate for 30-60 d according to the following operation time;
the runtime tuning manipulation strategy is as follows:
A 2 the nitrifying liquid of the/O reaction device (3) is controlled to have a reflux ratio of 100% -200%, and when the concentration of nitrate nitrogen or nitrite nitrogen in the effluent of the anoxic zone (5) is higher than 3mg/L, the reflux ratio of the nitrifying liquid is reduced; when the concentration of the nitrate nitrogen in the effluent of the aerobic zone (6) is higher than 10mg/L, the reflux ratio of the nitrifying liquid is improved;
the sludge reflux ratio is 50-100%, and A is controlled by adjusting the discharge amount of the excess sludge 2 The sludge age of the flocculated sludge in the O reaction device (3) is 15-20 d; the concentration of dissolved oxygen in the last cell of the aerobic zone (6) is 1-2 mg/L;
A 2 the hydraulic retention time of the O reaction device (3) is 10-16 h, wherein the anaerobic hydraulic retention time is 1.5-3 h, so that the phosphorus release amount of the anaerobic zone (4) reaches more than 10 mg/L; the anaerobic hydraulic retention time is 3-8 h;
when the average biomass of the single anaerobic/anoxic biological film is above 0.01g, the anaerobic ammonia oxidation bacteria are relatively abundantThe degree is more than 1 percent; a is that 2 The partial anaerobic ammonia oxidation process/O is started quickly and successfully in situ.
Realizing A based on gradually reducing suspended sludge concentration 2 The device and the method for quickly starting the anaerobic ammonia oxidation process in situ of the/O part are characterized in that a suspension filler is added into an anaerobic/anoxic zone, so that a growth carrier can be provided for anaerobic ammonia oxidation bacteria, and the anaerobic ammonia oxidation bacteria can be effectively maintained and enriched; through regulating and controlling the concentration of the suspended sludge, the mutual supply and competition relation of the biological film and the functional microorganisms on the suspended sludge to the reaction substrates are regulated and controlled; in the process of gradually reducing the concentration of the suspended sludge, more nitrate nitrogen and organic matters are utilized by denitrifying bacteria with short-range denitrification characteristics on the anaerobic/anoxic biological film, so that more substrate nitrite nitrogen is provided for the anaerobic ammonia oxidation bacteria, and meanwhile, the competition of the whole-course denitrifying bacteria in the suspended sludge for the nitrite nitrogen is weakened, and the growth of the anaerobic ammonia oxidation bacteria is promoted together to enrich the anaerobic ammonia oxidation bacteria. The suspended filler added into the aerobic zone can continuously enrich nitrifying bacteria, and ensures that the nitrifying performance of the aerobic zone is kept stable in the process of reducing the concentration of suspended sludge.
Realizing A based on gradually reducing suspended sludge concentration 2 The device and method for rapid in-situ start-up of the anaerobic ammonia oxidation process of the/O section have the following advantages over the prior art:
1) The key problem of in-situ enrichment and retention of anaerobic ammonia oxidation bacteria in the application of the main stream municipal sewage anaerobic ammonia oxidation technology is solved, and the quick in-situ starting of the continuous stream main stream municipal sewage partial anaerobic ammonia oxidation technology is firstly provided by gradually reducing the concentration of suspended sludge;
2) In the implementation process, the effluent quality of the original biological reactor is kept relatively stable, the implementation without stopping production is realized, and the method can be widely applied to the standard improvement of newly built sewage plants and old sewage plants;
3) Partial autotrophic denitrification is realized based on short-cut denitrification coupling anaerobic ammonia oxidation, 50% aeration quantity and 60% carbon source addition quantity can be saved theoretically at maximum, the sludge yield is low, and the sludge treatment cost is reduced;
drawings
FIG. 1 is based on a stepwise lowering of suspended sludgeConcentration implementation A 2 And a device for quickly starting the partial anaerobic ammonia oxidation process in situ.
In fig. 1: 1-a raw water tank; 2-a water inlet pump; 3-A 2 An O reaction device; 4-anaerobic zone; a 5-anoxic zone; 6-an aerobic zone; 7-a stirrer; 8-specific surface area of 25 mm in diameter 500m 2 /m 3 Polyethylene filler for anaerobic/anoxic zone; 9-diameter 25 mm specific surface area 500m 2 /m 3 Polyethylene filler in the aerobic zone; 10-A 2 an/O overflow pipe; 11-secondary sedimentation tank; 12-water outlet; 13-a blower; 14-rotameter; 15-a microporous aeration head; 16-nitrifying liquid reflux pump; 17-a sludge reflux pump; 18-sludge reflux gate valve; 29-excess sludge gate valve.
Detailed Description
In order to make the implementation method of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in conjunction with specific embodiments. It should be noted that the following examples are only illustrative to help understand the core ideas and technical solutions of the present invention. The scope of the invention is not limited in this respect.
1. Inoculation of sludge
A 2 the/O reaction device (3) is inoculated with secondary sedimentation tank residual activated sludge of a traditional sewage treatment plant, the activated sludge has basic nitrification, denitrification, carbon removal and phosphorus removal performances, and MLSS>8000mg/L、MLVSS/MLSS>0.65、SV<45%, keeping the initial sludge concentration of the reactor to be 3000-4000 mg/L; adding non-film-coated high-density polyethylene suspension filler (8) into the anaerobic zone (4) and the anoxic zone (5) for enriching anaerobic ammonia oxidizing bacteria and denitrifying bacteria, wherein the filling ratio is 10% -30%; adding a high-density polyethylene suspension filler (9) without a film to the aerobic zone (6) for enriching nitrifying bacteria, wherein the filling ratio is 20% -40%;
2. gradually reducing the concentration of sludge to enrich anaerobic ammonia oxidizing bacteria on anaerobic/anoxic biological film
1) Stage one: the operation strategy is regulated to operate for 20-30 d according to the following operation time when the suspended sludge concentration is 3000-4000 mg/L, so that a part of activated sludge microorganisms are primarily attached and trapped on the filler; the anaerobic/anoxic zone is filled with denitrifying bacteria and anaerobic ammonia oxidizing bacteria as the main functional microorganisms adhered and trapped on the filler of the anaerobic/anoxic zone due to low dissolved oxygen concentration; in the aerobic zone, the suspended filler is mainly attached and trapped functional microorganisms are nitrifying bacteria due to a higher dissolved oxygen environment; anaerobic ammonia oxidizing bacteria are difficult to effectively stay in the system due to low growth rate, the anaerobic/anoxic biological film can provide good growth conditions for the anaerobic ammonia oxidizing bacteria with low growth rate, and the biological film and the floccule sludge are separated in sludge age, so that the anaerobic ammonia oxidizing bacteria can be prevented from being elutriated by the system, and the aim of effectively stay and enriching the anaerobic ammonia oxidizing bacteria is fulfilled;
2) Stage two: on the basis of original residual sludge discharge, the residual sludge discharge amount is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 2000-3000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 2000-3000 mg/L, and adjusting the control strategy to operate for 30-60 d according to the following operation time; after the concentration of the suspended sludge is reduced, denitrifying bacteria on an anoxic biological film in the anoxic zone (5) compete for more substrates, so that more nitrate nitrogen is reduced to nitrite nitrogen, more substrate nitrite nitrogen is provided for anaerobic ammonia oxidation bacteria, the growth of the anaerobic ammonia oxidation bacteria is promoted to be enriched, nitrifying bacteria on suspended fillers in the aerobic zone (6) are enriched due to the fact that more substrates can be obtained, and the nitrifying performance of the aerobic zone (6) in the process of reducing the concentration of the suspended sludge is ensured;
3) Stage three: on the basis of the second stage, the discharge amount of the residual sludge is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 1000-2000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 1000-2000 mg/L, and adjusting the control strategy according to the following operation timeSlightly running for 30-60 d; as the concentration of the suspended sludge is further reduced, more substrates can be obtained from the biological film in the anoxic zone (4), denitrifying bacteria and anaerobic ammonia oxidizing bacteria on the biological film in the anoxic zone (5) are further enriched, and nitrifying bacteria on the biological film in the aerobic zone (6) are also further enriched.
The runtime tuning manipulation strategy is as follows:
A 2 the nitrifying liquid of the/O reaction device (3) is controlled to have a reflux ratio of 100% -200%, and when the concentration of nitrate nitrogen or nitrite nitrogen in the effluent of the anoxic zone (5) is higher than 3mg/L, the reflux ratio of the nitrifying liquid is reduced; when the concentration of the nitrate nitrogen in the effluent of the aerobic zone (6) is higher than 10mg/L, the reflux ratio of the nitrifying liquid is improved;
the sludge reflux ratio is 50-100%, and A is controlled by adjusting the discharge amount of the excess sludge 2 The sludge age of the flocculated sludge in the O reaction device (3) is 15-20 d; the concentration of dissolved oxygen in the last cell of the aerobic zone (6) is 1-2 mg/L;
A 2 the hydraulic retention time of the O reaction device (3) is 10-16 h, wherein the anaerobic hydraulic retention time is 1.5-3 h, so that the phosphorus release amount of the anaerobic zone (4) reaches more than 10 mg/L; the anaerobic hydraulic retention time is 3-8 h;
when the average biomass of a single anaerobic/anoxic biological film is above 0.01g, wherein the relative abundance of anaerobic ammonia oxidizing bacteria is above 1%; a is that 2 The partial anaerobic ammonia oxidation process/O is started quickly and successfully in situ.
The test adopts domestic sewage in a certain district as raw water, and the specific water quality is as follows: NH (NH) 4 + 45-60 mg/L of-N, 140-250 mg/L of COD concentration and NO 2 - The concentration of the-N is 0 to 0.5mg/L, NO 3 - -N concentration is 0-1 mg/L;
the test results show that: after 200d of operation, the average biomass on the individual anoxic biofilms was 0.023g, with a relative abundance of anammox bacteria of 1.8%; the quality of the effluent water of the experiment is as follows: NH (NH) 4 + The concentration of-N is 0-2 mg/L, the concentration of COD is 20-35 mg/L, and NO 2 - N concentration of 0-0.5 mg/L, NO 3 - The concentration of N is 8-12 mg/L, and the concentration of TN is 9-12 mg/L.
In the drawings or the description, the implementation methods not drawn or described are all forms known to those skilled in the art, and are not described in detail. Furthermore, the above definition of each element is not limited to the specific structures, shapes or methods mentioned in the embodiments, and may not be simply modified or replaced. Any modification made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (1)

1. Realizing A based on gradually reducing suspended sludge concentration 2 The method for quickly and in-situ starting the anaerobic ammonia oxidation process of the/O part is characterized by comprising the following steps: the equipment used in the method consists of a raw water tank (1) and a raw water tank A 2 The O reaction device (3) and the secondary sedimentation tank (11) are sequentially connected; wherein A is 2 The O reaction device (3) sequentially comprises an anaerobic zone (4), an anoxic zone (5) and an aerobic zone (6); the raw water tank (1) is connected with the anaerobic zone (4) through the water inlet pump (2), the anaerobic zone (4) is connected with the anoxic zone (5), the anoxic zone (5) is connected with the aerobic zone (6), and the overflow holes are arranged up and down in a staggered manner according to the water flow direction and are connected with all the cells; the aerobic zone (6) is connected with the water tank through A 2 the/O overflow pipe (10) is connected with the secondary sedimentation tank (11); the bottom of the secondary sedimentation tank (11) is connected with the anaerobic zone (4) through a sludge reflux pump (17); the last cell of the aerobic zone (6) is connected with the first cell of the anoxic zone (5) by a nitrifying liquid reflux pump (16);
an agitator (7) is arranged in the anaerobic zone (4) and the anoxic zone (5) and is used for mixing the mixed liquid and fluidizing the polyethylene filler (8); an aeration system of an air compressor (13), a gas flowmeter (14) and an aeration head (15) is arranged in the aerobic zone (6) for aeration and fluidization of polyethylene filler (9) in the aerobic zone;
polyethylene filler (8) is added into the anaerobic zone (4) and the anoxic zone (5) in a filling ratio of 10% -30%, and a growth carrier is provided for anaerobic ammonia oxidizing bacteria and denitrifying bacteria so as to enrich the anaerobic ammonia oxidizing bacteria and the denitrifying bacteria; an aerobic zone polyethylene filler (9) is placed in the aerobic zone (6) with a filling ratio of 20% -40%, and a growth carrier is provided for nitrifying bacteria so as to enrich the nitrifying bacteria;
the method is characterized by comprising the following steps of:
(1) Inoculating sludge: a is that 2 The O reaction device (3) is inoculated with secondary sedimentation tank residual activated sludge of a traditional sewage treatment plant, and the sludge concentration is 3000-4000 mg/L;
(2) The operation steps of gradually reducing the concentration of the suspended sludge are as follows:
stage one: the method is regulated to operate for 20 to 30 days according to the following operation and control strategy when the suspended sludge concentration is 3000 to 4000mg/L, so that a part of activated sludge microorganisms are primarily attached and trapped on the filler;
stage two: on the basis of original residual sludge discharge, the residual sludge discharge amount is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 2000-3000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 2000-3000 mg/L, and adjusting the control strategy to operate for 30-60 d according to the following operation time;
stage three: on the basis of the second stage, the discharge amount of the residual sludge is additionally increased by 5 to 10 percent every day, so that A 2 The suspended sludge concentration of the/O reaction device (3) is gradually reduced to 1000-2000 mg/L for 30-45 d; increasing the aeration quantity of each cell of the aerobic zone (6) while increasing the discharge of excess sludge, and controlling the concentration of dissolved oxygen in the last cell of the aerobic zone (6) to be 2-4 mg/L so that the ammonia nitrogen concentration of the effluent water at the aerobic terminal is lower than 2mg/L; then maintaining the suspended sludge concentration of the system to be 1000-2000 mg/L, and adjusting the control strategy to operate for 30-60 d according to the following operation time;
the runtime tuning manipulation strategy is as follows:
A 2 the nitrifying liquid of the/O reaction device (3) is controlled to have a reflux ratio of 100% -200%, and when the concentration of nitrate nitrogen or nitrite nitrogen in the effluent of the anoxic zone (5) is higher than 3mg/L, the reflux ratio of the nitrifying liquid is reduced; when the concentration of the nitrate nitrogen in the effluent of the aerobic zone (6) is higher than 10mg/L, the reflux ratio of the nitrifying liquid is improved;
the sludge reflux ratio is 50-100%, and A is controlled by adjusting the discharge amount of the excess sludge 2 Floc sludge in the/O reaction device (3)The age is 15-20 d; the concentration of dissolved oxygen in the last cell of the aerobic zone (6) is 1-2 mg/L;
A 2 the hydraulic retention time of the O reaction device (3) is 10-16 h, wherein the anaerobic hydraulic retention time is 1.5-3 h, so that the phosphorus release amount of the anaerobic zone (4) reaches more than 10 mg/L; the anaerobic hydraulic retention time is 3-8 h;
when the average biomass of a single anaerobic/anoxic biological film is above 0.01g, wherein the relative abundance of anaerobic ammonia oxidizing bacteria is above 1%; a is that 2 The partial anaerobic ammonia oxidation process/O is started quickly and successfully in situ.
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