CN113998782A - Device and method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation - Google Patents

Device and method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation Download PDF

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CN113998782A
CN113998782A CN202111194696.2A CN202111194696A CN113998782A CN 113998782 A CN113998782 A CN 113998782A CN 202111194696 A CN202111194696 A CN 202111194696A CN 113998782 A CN113998782 A CN 113998782A
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CN113998782B (en
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彭永臻
高歆婕
王诗然
丁静
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Beijing University of Technology
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    • 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
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    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
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    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
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    • C02F2101/166—Nitrites
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    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/14—NH3-N
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/15—N03-N
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    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/02—Odour removal or prevention of malodour
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2305/06—Nutrients for stimulating the growth of microorganisms

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Abstract

A device and a method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation belong to the field of urban sewage treatment and regeneration. The device mainly comprises a gas collecting and circulating device, a continuous flow anaerobic/aerobic/anoxic biochemical tank and a sedimentation tank. The device is connected with a PLC controller. The wastewater enters a biochemical pool, a carbon source is stored in an anaerobic stage, nitrification is carried out in an aerobic zone, and the carbon source stored in the anaerobic stage is utilized to carry out endogenous denitrification in a post-anoxic zone. The gas collecting device collects hydrogen sulfide and methane odor discharged by treatment structures such as a grid, an anaerobic tank, a sedimentation tank and the like, the hydrogen sulfide and methane odor is introduced into the post-anoxic zone through the gas collecting pipe, and the methane, the hydrogen sulfide and the like are used as electron donors in the post-anoxic zone to generate autotrophic denitrification and enhance denitrification. The autotrophic denitrification enhanced nitrogen removal is realized through the process, the deep nitrogen removal effect is realized, an external carbon source is not needed, the odor reduction can be realized, and the process has the characteristics of energy conservation, consumption reduction and the like.

Description

Device and method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation
Technical Field
The invention belongs to the field of urban sewage treatment and regeneration, and particularly relates to a device and a method for realizing autotrophic denitrification enhanced continuous flow anaerobic/aerobic/anoxic denitrification through gas collection and circulation.
Background
With the rapid development of human economy, environmental pollution is becoming more serious, and water pollution is also becoming more serious. At present, with the stricter sewage discharge standards and the stricter odor discharge standards of sewage treatment plants, nitrogen and phosphorus are effectively removed from sewage with low C/N ratio in an energy-saving, economic and effective manner, the emission of malodorous gas is reduced, and meeting the stricter quality standards is an important challenge faced by the sewage treatment plants.
The reaction mechanism of sulfur autotrophic denitrification is that inorganic energy-transforming nutritional type and light energy-nutritional type sulfur oxidizing bacteria utilize reduced sulfur (S) under the condition of oxygen deficiency or anaerobic condition0、S2-、S2O3 2-Etc.) as electron donors to obtain energy by oxidation of reduced sulfur, while reducing nitrate as electron acceptor to nitrogen, using inorganic carbon (e.g., CO)3 2-、HCO3 -) Synthesizing cells, thereby realizing autotrophic denitrification. Commonly used as electron donors for sulfur autotrophic denitrification are sulfur, sulfide-containing minerals, wastewater and waste gas. The main component of the malodorous gas generated by the urban sewage treatment plant is reducing sulfide, the malodorous gas comes from a grid, a sludge pipeline, a sludge storage tank, an anaerobic/anoxic tank and the like, hydrogen sulfide in the malodorous gas is used as a denitrification electron donor, so that an economic and safe mode is provided, and meanwhile, hydrocarbons and oxygen-containing organic matters in the malodorous gas can also be used as the denitrification electron donor, so that the synergistic action of methane oxidation and denitrification, namely denitrification type methane anaerobic oxidation (DAMO) is realized. Can simultaneously achieve the aims of removing the sulfur of the malodorous gas and strengthening the nitrogen removal of the wastewater. The reaction equation of autotrophic denitrification and denitrification type methane anaerobic oxidation with sulfide as an electron donor is as follows:
5S2-+8NO3 -+8H+—5SO4 2-+4N2+4H2O (1)
5CH4+8NO3 -8H+—4N2+14H2O+5CO2 (2)
on the basis, a device and a method for carrying out autotrophic denitrification enhanced nitrogen removal by collecting malodorous gas of a sewage treatment plant and introducing the malodorous gas into an anoxic tank are provided. Deep nitrogen and phosphorus removal is carried out on sewage mainly in a continuous flow anaerobic/aerobic/anoxic biochemical pond through nitrification and endogenous denitrification; the malodorous gas is pumped into a gas collecting pipe by a gas collecting hood to collect waste gas containing hydrogen sulfide odor structures of sewage treatment plants such as a grid, an anaerobic tank, a sedimentation tank and the like, and is introduced into an anoxic tank, and autotrophic denitrification is carried out in a postposition anoxic zone by using methane, hydrogen sulfide and the like as electron donors, so that the denitrification effect of the anoxic zone of the continuous flow anaerobic/aerobic/anoxic system is enhanced, the carbon source requirement in the denitrification process is further reduced, and the concentration of pollutants such as hydrogen sulfide and the like in the malodorous gas is reduced. The aim of enhancing denitrification is achieved through the process, and resources are fully and efficiently utilized.
Disclosure of Invention
The invention aims to provide a device and a method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation for the nitrogen removal of low C/N ratio municipal sewage and reducing the emission of malodorous gases. In the device, wastewater enters a continuous flow anaerobic/aerobic/anoxic biochemical pool, carbon sources and residual nitrate nitrogen in denitrification return sludge are stored in an anaerobic stage, nitrification is carried out in an aerobic zone, and the carbon sources stored in the anaerobic stage are utilized to carry out endogenous denitrification in a post-anoxic zone. The gas collecting device collects odor containing hydrogen sulfide of a grid, an anaerobic tank, a sedimentation tank and the like, and the odor is introduced into the post-anoxic zone through the gas collecting pipe, and the post-anoxic zone utilizes methane, hydrogen sulfide and the like as electron donors to generate autotrophic denitrification so as to strengthen the denitrification effect of the post-anoxic zone. The method does not need an additional carbon source, fully utilizes resources, and can realize the deep denitrification of the low C/N urban sewage and the reduction of malodorous gases.
1. A device and a method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation are characterized in that: comprises a gas collecting and circulating device (1), a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), a sedimentation tank (3) and a PLC (programmable logic controller) connected with the sedimentation tank (4);
foul gas is respectively collected by a gas collecting and circulating device (1) to form a grid gas collecting hood (1.1), an anaerobic pool gas collecting hood (1.2), a sedimentation pool gas collecting hood (1.4) and gas in a mud storage pool gas collecting hood (1.5), enters a gas collecting pipe (1.6) through an air pump (1.7) and is introduced into an anoxic pool (2.3), gas generated in the anoxic pool enters the anoxic pool gas collecting hood (1.3), enters the gas collecting pipe (1.6) through the air pump (1.7) to realize gas circulation or is discharged through an emptying pipe (1.8), and is introduced into an aerobic pool (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), sequentially passes through an anaerobic tank (2.1), an aerobic tank (2.2) and an anoxic tank (2.3) and then flows out, and a stirrer (2.4), an aeration device (2.5) and a variable-frequency blower (2.6) are arranged in the continuous flow anaerobic/aerobic/anoxic biochemical tank (2); then the effluent enters a sedimentation tank (3), and sludge respectively flows back to an anaerobic tank (2.1) and an anoxic tank (2.3) through a submersible sewage pump (3.1) and residual sludge is discharged to a sludge storage tank (3.2);
the PLC controller (4) is connected with a computer (4.2) through an automatic control box (4.1), controls an automatic control valve (4.4), an air pipe valve (1.9), a variable frequency blower (2.6) and an air pump (1.7), and detects the concentration of dissolved oxygen, ammonia nitrogen, nitrate nitrogen and total nitrogen through an online detection device (4.3). The on-line detection equipment is arranged at the aerobic tail end, the anoxic tail end and the water outlet position. Wherein the aerobic tail end refers to the position where aerobic aeration is finished in the advancing direction of water flow; the anoxic tail end refers to the position where the anoxic stirring is finished in the advancing direction of water flow,
the treatment process of the urban sewage in the device is as follows: the wastewater enters a continuous flow anaerobic/aerobic/anoxic biochemical pool, a carbon source is stored in an anaerobic stage, nitrate nitrogen in the return sludge is removed through denitrification, nitrification is carried out in an aerobic zone, and the carbon source stored in the anaerobic stage is utilized to carry out endogenous denitrification in a post-anoxic zone. The gas collecting device collects odor containing hydrogen sulfide of a grid, an anaerobic tank, a sedimentation tank and the like, and the odor is introduced into the post-anoxic zone through the gas collecting pipe, and the post-anoxic zone utilizes methane, hydrogen sulfide and the like as electron donors to generate autotrophic denitrification so as to strengthen the denitrification effect of the post-anoxic zone. When the concentration of the odor containing hydrogen sulfide is excessive and is difficult to remove in the anoxic zone, the odor is introduced into the aerobic zone to oxidize the hydrogen sulfide gas through the aeration effect, and the contribution of synchronous nitrification, denitrification and denitrification in the aerobic zone is increased.
The invention discloses a device and a method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation, which are characterized by comprising the following steps:
(1) start of continuous flow anaerobic/aerobic/anoxic: sludge of a municipal sewage treatment plant is taken as inoculated sludge, and municipal sewage is taken as raw water; the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank is 12h, wherein the anaerobic tank is 3h, the aerobic tank is 3h, and the anoxic tank is 6 h; the valve which flows back to the anoxic tank is closed, and DO of the aerobic tank is 2-3 mg/L; when the ammonia nitrogen concentration at the aerobic end is less than 5mg/L and is stably maintained for more than 5 days, the start of the nitrification stage is considered to be successful; starting a valve which flows back to the anoxic tank when the initial denitrification starting stage is started, and when the sum of the concentration of nitrate nitrogen and nitrite in the effluent is less than 5mg/L, the sludge amount which flows back to the anoxic tank is 50 percent of the water inflow amount; when the sum of the effluent nitrate nitrogen and nitrite concentration is less than or equal to 5mg/L and less than or equal to 10mg/L, the sludge amount which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the concentration of nitrate nitrogen and nitrite in the effluent is more than 10mg/L, the sludge amount which flows back to the anoxic tank is 150% of the water inflow, and the start of the endogenous denitrification stage is considered successful when the total nitrogen concentration of the effluent is less than 15mg/L and is stably maintained for more than 5 days;
(2) starting the gas collecting and circulating device: the grid gas-collecting hood, the anaerobic pool gas-collecting hood, the sedimentation pool gas-collecting hood and the mud storage pool gas-collecting hood are communicated with each other to collect odor in the communicated gas-collecting hoods2S concentration > 100mg/m3The air pump is started to contain H2S and CH4Introducing the odor into the anoxic tank, and introducing H into the communicated gas collecting hood2S concentration is less than or equal to 40mg/m3The air pump is stopped; the gas-collecting hood of the anoxic tank is separately arranged, and when H is in the anoxic gas-collecting hood2S concentration is less than or equal to 0.03mg/m3Directly discharged into the atmosphere; 10mg/m3H in the gas-collecting hood of the anoxic tank2S concentration > 0.03mg/m3Then, starting an air pump of the anoxic pond to perform gas circulation; h in the gas-collecting hood at the top of the anoxic tank2S concentration is more than or equal to 10mg/m3Opening an air pipe valve which is introduced into the aerobic tank, and when the sum of the concentration of nitrate nitrogen and nitrite in the effluent is less than 10mg/L after gas is introduced, indicating that the autotrophic denitrification is successfully started;
(3) controlling autotrophic and heterotrophic coupled denitrification: continuous flow anaerobic/aerobic/anoxic biochemical tank and gas collectionAfter the circulation device is started successfully, the sludge concentration is controlled to be 3000-5000mg/L, and the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical pool is 12h, wherein the anaerobic pool is 3h, the aerobic pool is 3h, and the anoxic pool is 6 h; when the ammonia nitrogen concentration at the aerobic end is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1 mg/L; when the concentration of the aerobic final ammonia nitrogen is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling DO of the aerobic tank to be 1-2 mg/L; the concentration of the aerobic final ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4 mg/L; when the sum of the concentration of the effluent nitrate nitrogen and the concentration of the effluent nitrite are less than 10mg/L, the communicated gas-collecting hood H2S concentration higher than 100mg/m3While opening the air pump H2The concentration of S is less than 40mg/m3Stopping the air pump, and intermittently introducing odor into the anoxic pond; when the sum of the effluent nitrate nitrogen and nitrite concentration is more than or equal to 10mg/L, the air pump is kept in an open state, malodorous gas is continuously introduced, and meanwhile, anaerobic ammonia oxidation fillers with the filling ratio of 10-20% are respectively added into the anaerobic/aerobic/anoxic tank, so that the autotrophic nitrogen removal effect is enhanced.
Compared with the prior art, the device and the method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation have the following advantages:
(1) the continuous flow anaerobic/aerobic/anoxic can fully utilize the carbon source in the raw water to realize deep nitrogen removal by nitrifying endogenous denitrification.
(2) The malodorous gas generated in the treatment process of common structures of sewage treatment plants is fully utilized to carry out autotrophic denitrification, the discharge of harmful ingredients in the malodorous gas is reduced, the waste treatment by waste is realized, and the sludge reduction is realized.
(2) Heterotrophic denitrification is coupled with autotrophic denitrification, so that denitrification is enhanced, the demand of carbon sources is further reduced, and the cost of sewage treatment is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a device for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation.
1, a gas collecting and circulating device, 2, a continuous flow anaerobic/aerobic/anoxic biochemical tank, 3, a sedimentation tank and 4, a PLC controller; 1.1 is a grid gas-collecting hood, 1.2 is an anaerobic pool gas-collecting hood, 1.3 is an anoxic pool gas-collecting hood, 1.4 is an anaerobic pool gas-collecting hood, 1.5 is a mud storage pool gas-collecting hood, 1.6 is a gas-collecting pipe, 1.7 is an air pump, 1.8 is an emptying pipe, and 1.9 is an air pipe valve; 2.1 is an anaerobic tank, 2.2 is an aerobic tank, 2.3 is an anoxic tank, 2.4 is a stirrer, 2.5 is an aeration device, and 2.6 is a variable blower; 3.1 is a submersible sewage pump, and 3.2 is a sludge storage tank; 4.1 is a self-control box, 4.2 is a computer, 4.3 is an online detection device, and 4.4 is a self-control valve.
The specific implementation mode is as follows:
the invention will be further described and illustrated with reference to the accompanying drawings: a device and a method for realizing autotrophic denitrification enhanced nitrogen removal through gas collection and circulation are characterized in that: comprises a gas collecting and circulating device (1), a continuous flow anaerobic/aerobic/anoxic biochemical pool (2), a sedimentation pool (3) and a PLC (programmable logic controller) which are connected in sequence;
foul gas is respectively collected by a gas collecting and circulating device (1) to form a grid gas collecting hood (1.1), an anaerobic pool gas collecting hood (1.2), a sedimentation pool gas collecting hood (1.4) and gas in a mud storage pool gas collecting hood (1.5), enters a gas collecting pipe (1.6) through an air pump (1.7) and is introduced into an anoxic pool (2.3), gas generated in the anoxic pool enters the anoxic pool gas collecting hood (1.3), enters the gas collecting pipe (1.6) through the air pump (1.7) to realize gas circulation or is discharged through an emptying pipe (1.8), and is introduced into an aerobic pool (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), sequentially passes through an anaerobic tank (2.1), an aerobic tank (2.2) and an anoxic tank (2.3) and then flows out, and a stirrer (2.4), an aeration device (2.5) and a variable-frequency blower (2.6) are arranged in the continuous flow anaerobic/aerobic/anoxic biochemical tank (2); then the effluent enters a sedimentation tank (3), and sludge respectively flows back to an anaerobic tank (2.1) and an anoxic tank (2.3) through a submersible sewage pump (3.1) and residual sludge is discharged to a sludge storage tank (3.2);
the PLC controller (4) is connected with a computer (4.2) through an automatic control box (4.1), controls an automatic control valve (4.4), a variable frequency blower (2.6) and an air pump (1.7), and detects the concentration of dissolved oxygen, ammonia nitrogen, nitrate nitrogen and total nitrogen through an online detection device (4.3).
The specific operation is as follows:
(1) sludge of a municipal sewage treatment plant is taken as inoculated sludge, and municipal sewage is taken as raw water; the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank is 12h, wherein the anaerobic tank is 3h, the aerobic tank is 3h, and the anoxic tank is 6 h; the valve which flows back to the anoxic stage is closed, a feedback control loop is formed by the online dissolved oxygen concentration meter and the variable frequency fan, and when DO detected by the online dissolved oxygen concentration meter is higher than 3mg/L, the frequency of the fan is reduced by the PLC controller, so that the air quantity is reduced; when the DO detected by the on-line dissolved oxygen concentration meter is higher than 2mg/L, increasing the frequency of a fan through a PLC controller so as to improve the air volume, keeping the DO of the aerobic tank at 2-3mg/L, and enriching the nitrified sludge; when the ammonia nitrogen concentration at the aerobic tail end is less than 5mg/L and is stably maintained for more than 5 days, the start of the nitrification stage is considered to be successful;
(2) and opening a valve which flows back to the anoxic stage to improve the sludge concentration of the anoxic tank so as to increase the biomass of the post-denitrification area and improve the denitrification rate. When the sum of the effluent nitrate nitrogen and nitrite concentration is less than 5mg/L, adjusting the sludge amount which flows back to the anoxic tank to be 50% of the water inflow through a valve and a submersible sewage pump; when the sum of the effluent nitrate nitrogen and nitrite concentration is less than or equal to 5mg/L and less than or equal to 10mg/L, the sludge amount which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the concentration of the nitrate nitrogen and the concentration of the nitrite in the effluent is more than 10mg/L, and the sludge amount which flows back to the anoxic tank is 150 percent of the water inflow. Meanwhile, the aeration quantity is adjusted through the ammonia nitrogen concentration at the aerobic tail end, so that the nitrification effect at the stage is kept stable. When the ammonia nitrogen concentration at the aerobic end is less than 1mg/L, regulating the air flow by a variable frequency blower to reduce the DO of the aerobic tank to 0.5-1 mg/L; when the concentration of the aerobic final ammonia nitrogen is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling DO of the aerobic tank to be 1-2mg/L by a variable frequency blower; the concentration of the ammonia nitrogen at the end of the aerobic process is more than 5mg/L, the DO of the aerobic pool is controlled to be 2-4mg/L by a frequency conversion blower, the total nitrogen concentration measured by an on-line total nitrogen concentration meter at the end of the anoxic process is less than 15mg/L, and the start of the endogenous denitrification stage is considered to be successful when the total nitrogen concentration is stably maintained for more than 5 days. When the total nitrogen concentration of the effluent is less than 15mg/L and the effluent is stably maintained for more than 5 days, the start of the endogenous denitrification stage is considered to be successful;
(3) collecting odor of structures of sewage treatment plants such as a grid, an anaerobic pool, a sedimentation pool, a sludge storage pool and the like through the gas collecting hood, wherein the gas collecting hoods except the gas collecting hood of the anoxic pool are communicated with each other, and when H is in the communicated gas collecting hoods2S concentration higher than 100mg/m3Starting the air pump to contain H2S and CH4Introducing the odor into an anoxic pond when the H is higher2S concentration is less than 40mg/m3The suction pump is stopped. H in the gas-collecting hood of the anoxic tank2S concentration is less than or equal to 0.03mg/m3Then directly discharged into the atmosphere; h in the gas-collecting hood of the anoxic tank2The concentration of S is more than 0.03mg/m3But less than 10mg/m3Starting a suction pump of the anoxic pond to perform gas circulation; h in the gas-collecting hood of the anoxic tank2S concentration is more than or equal to 10mg/m3Then an air pipe valve leading into the aerobic tank is opened to lead excessive H2Oxidation of S to SO4 2-Removing while part H2S, denitrification is carried out in the aerobic tank to continuously remove part of total nitrogen. When the sum of the concentration of the nitrate nitrogen and the concentration of the nitrite in the effluent is less than 10mg/L after the gas is introduced, the start of autotrophic denitrification is successful;
(3) after the continuous flow anaerobic/aerobic/anoxic biochemical tank and the gas collecting and circulating device are started successfully, the sludge concentration is controlled to be 3000-; when the ammonia nitrogen concentration at the aerobic end is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1 mg/L; when the concentration of the aerobic final ammonia nitrogen is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling DO of the aerobic tank to be 1-2 mg/L; the concentration of the aerobic final ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4 mg/L; when the sum of the concentration of nitrate nitrogen and nitrite in effluent is less than 10mg/L, the concentration of nitrite in effluent is less than H2S concentration higher than 100mg/m3While opening the air pump H2The concentration of S is less than 40mg/m3Stopping the air pump, and intermittently introducing odor into the anoxic pond; when the sum of the concentration of nitrate nitrogen and nitrite in the effluent is more than or equal to 10mg/L, the air pump is kept in an open state, malodorous gas is continuously introduced, and H is increased2And S, the autotrophic denitrification is enhanced within the time of introducing into the anoxic tank. Simultaneously, anaerobic ammonia oxidation fillers with the filling ratio of 10-20% are respectively added into the anaerobic/aerobic/anoxic tank, and an anaerobic ammonia oxidation autotrophic denitrification way is introduced to further strengthen the autotrophic denitrification.
The foregoing is a detailed description of the invention that will enable those skilled in the art to better understand and practice the invention, and it is not to be limited thereby, since simple modifications and variations can be made by those skilled in the art without departing from the scope of the invention.

Claims (2)

1. The utility model provides a realize autotrophic denitrification and strengthen device of denitrogenation through gas collection and circulation which characterized in that: comprises a gas collecting and circulating device (1), a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), a sedimentation tank (3) and a PLC (programmable logic controller) connected with the sedimentation tank (4);
foul gas is respectively collected by a gas collecting and circulating device (1) to form a grid gas collecting hood (1.1), an anaerobic pool gas collecting hood (1.2), a sedimentation pool gas collecting hood (1.4) and gas in a mud storage pool gas collecting hood (1.5), enters a gas collecting pipe (1.6) through an air pump (1.7) and is introduced into an anoxic pool (2.3), gas generated in the anoxic pool enters the anoxic pool gas collecting hood (1.3), enters the gas collecting pipe (1.6) through the air pump (1.7) to realize gas circulation or is discharged through an emptying pipe (1.8), and is introduced into an aerobic pool (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), sequentially passes through an anaerobic tank (2.1), an aerobic tank (2.2) and an anoxic tank (2.3) and then flows out, and a stirrer (2.4), an aeration device (2.5) and a variable-frequency blower (2.6) are arranged in the continuous flow anaerobic/aerobic/anoxic biochemical tank (2); then the effluent enters a sedimentation tank (3), and sludge respectively flows back to an anaerobic tank (2.1) and an anoxic tank (2.3) through a submersible sewage pump (3.1) and residual sludge is discharged to a sludge storage tank (3.2);
the PLC controller (4) is connected with a computer (4.2) through an automatic control box (4.1), controls an automatic control valve (4.4), an air pipe valve (1.9), a variable frequency blower (2.6) and an air pump (1.7), and detects the concentration of dissolved oxygen, ammonia nitrogen, nitrate nitrogen and total nitrogen through an online detection device (4.3).
2. Method for applying the device according to claim 1, comprising the steps of:
(1) start of continuous flow anaerobic/aerobic/anoxic: sludge of a municipal sewage treatment plant is taken as inoculated sludge, and municipal sewage is taken as raw water; the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank is 12h, wherein the anaerobic tank is 3h, the aerobic tank is 3h, and the anoxic tank is 6 h; the valve which flows back to the anoxic tank is closed, and DO of the aerobic tank is 2-3 mg/L; when the ammonia nitrogen concentration at the aerobic end is less than 5mg/L and is stably maintained for more than 5 days, the start of the nitrification stage is considered to be successful; starting a valve which flows back to the anoxic tank when the initial denitrification starting stage is started, and when the sum of the concentration of nitrate nitrogen and nitrite in the effluent is less than 5mg/L, the sludge amount which flows back to the anoxic tank is 50 percent of the water inflow amount; when the sum of the effluent nitrate nitrogen and nitrite concentration is less than or equal to 5mg/L and less than or equal to 10mg/L, the sludge amount which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the concentration of nitrate nitrogen and nitrite in the effluent is more than 10mg/L, the sludge amount which flows back to the anoxic tank is 150% of the water inflow, and the start of the endogenous denitrification stage is considered successful when the total nitrogen concentration of the effluent is less than 15mg/L and is stably maintained for more than 5 days;
(2) starting the gas collecting and circulating device: the grid gas-collecting hood, the anaerobic pool gas-collecting hood, the sedimentation pool gas-collecting hood and the mud storage pool gas-collecting hood are communicated with each other to collect odor in the communicated gas-collecting hoods2S concentration > 100mg/m3The air pump is started to contain H2S and CH4Introducing the odor into the anoxic tank, and introducing H into the communicated gas collecting hood2S concentration is less than or equal to 40mg/m3The air pump is stopped; the gas-collecting hood of the anoxic tank is separately arranged, and when H is in the anoxic gas-collecting hood2S concentration is less than or equal to 0.03mg/m3Directly discharged into the atmosphere; 10mg/m3H in the gas-collecting hood of the anoxic tank2S concentration > 0.03mg/m3Then, starting an air pump of the anoxic pond to perform gas circulation; h in the gas-collecting hood at the top of the anoxic tank2S concentration is more than or equal to 10mg/m3Opening an air pipe valve which is introduced into the aerobic tank, and when the sum of the concentration of nitrate nitrogen and nitrite in the effluent is less than 10mg/L after gas is introduced, indicating that the autotrophic denitrification is successfully started;
(3) controlling autotrophic and heterotrophic coupled denitrification: after the continuous flow anaerobic/aerobic/anoxic biochemical tank and the gas collecting and circulating device are started successfully, the sludge concentration is controlled to be 3000-; when the ammonia nitrogen concentration at the aerobic end is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1 mg/L; when the concentration of the aerobic final ammonia nitrogen is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling DO of the aerobic tank to be 1-2 mg/L; the concentration of the aerobic final ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4 mg/L; when the sum of the concentration of the effluent nitrate nitrogen and the concentration of the effluent nitrite are less than 10mg/L, the communicated gas-collecting hood H2S concentration higher than 100mg/m3While opening the air pump H2The concentration of S is less than 40mg/m3Stopping the air pump, and intermittently introducing odor into the anoxic pond; when the sum of the effluent nitrate nitrogen and nitrite concentration is more than or equal to 10mg/L, the air pump is kept in an open state, malodorous gas is continuously introduced, and meanwhile, anaerobic ammonia oxidation fillers with the filling ratio of 10-20% are respectively added into the anaerobic/aerobic/anoxic tank, so that the autotrophic nitrogen removal effect is enhanced.
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