CN113998782B - Device and method for realizing autotrophic denitrification enhanced denitrification through gas collection and circulation - Google Patents

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

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CN113998782B
CN113998782B CN202111194696.2A CN202111194696A CN113998782B CN 113998782 B CN113998782 B CN 113998782B CN 202111194696 A CN202111194696 A CN 202111194696A CN 113998782 B CN113998782 B CN 113998782B
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CN113998782A (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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    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/166—Nitrites
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2101/38—Organic compounds containing nitrogen
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    • 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
    • C02F2209/005—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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/15—N03-N
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/22—O2
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    • 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
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms

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Abstract

A device and a method for realizing autotrophic denitrification enhanced denitrification 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 tank, 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 the odor containing hydrogen sulfide and methane discharged by treatment structures such as a grating, an anaerobic tank, a sedimentation tank and the like, and the odor is introduced into a rear anoxic zone through a gas collecting pipe, autotrophic denitrification is carried out in the rear anoxic zone by using methane, hydrogen sulfide and the like as electron donors, and the denitrification is enhanced. The autotrophic denitrification enhanced denitrification is realized through the flow, the deep denitrification effect is realized, an additional carbon source is not needed, meanwhile, odor reduction can be realized, and the characteristics of energy conservation, consumption reduction and the like are realized.

Description

Device and method for realizing autotrophic denitrification enhanced denitrification 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 reinforced continuous flow anaerobic/aerobic/anoxic denitrification through gas collection and circulation.
Background
With the rapid development of human economy, environmental pollution is increasingly serious, and water pollution is also increasingly serious. At present, with the increasingly strict sewage discharge standard and the odor discharge standard of sewage treatment plants, the energy-saving, economical and effective removal of nitrogen and phosphorus from sewage with low C/N ratio, the reduction of the discharge of malodorous gas and the satisfaction of the increasingly strict quality standard are important challenges facing sewage treatment plants.
The reaction mechanism of the sulfur autotrophic denitrification is that inorganic energy nutrition type and light energy nutrition type sulfur oxidizing bacteria utilize reduced sulfur (S) under the anoxic or anaerobic condition 0 、S 2- 、S 2 O 3 2- Etc.) as electron donors, energy is obtained by oxidizing reduced sulfur, while nitrate is used as electron acceptor, which is reduced to nitrogen, using inorganic carbon (e.g. CO 3 2- 、HCO 3 - ) Synthesizing cells, thereby realizing autotrophic denitrification. Sulfur, sulfide-containing compounds, commonly used as sulfur autotrophic denitrification electron donorsIs a waste water and gas. The main components of the malodorous gas generated by the urban sewage treatment plant are reducing sulfides, which come from grids, sludge pipelines, sludge storage tanks, anaerobic/anoxic tanks and the like, hydrogen sulfide in the malodorous gas is used as a denitrification electron donor, which is an economic and safe mode, and meanwhile, hydrocarbon and oxygen-containing organic matters in the malodorous gas can also be used as denitrification electron donors, so as to realize the synergistic effect of methane oxidation and denitrification, namely denitrification methane anaerobic oxidation (DAMO). Can simultaneously achieve the purposes of malodorous gas desulfurization and enhanced wastewater denitrification. Wherein, the reaction equation of autotrophic denitrification and denitrification methane anaerobic oxidation with sulfide as electron donor is as follows:
5S 2- +8NO 3 - +8H + —5SO 4 2- +4N 2 +4H 2 O (1)
5CH 4 +8NO 3 - 8H + —4N 2 +14H 2 O+5CO 2 (2)
on the basis, a device and a method for autotrophic denitrification reinforced denitrification by collecting malodorous gas of a sewage treatment plant and introducing the malodorous gas into an anoxic tank are provided. The sewage is mainly subjected to deep nitrogen and phosphorus removal in a continuous flow anaerobic/aerobic/anoxic biochemical tank through nitrification and endogenous denitrification; the foul gas is pumped into a gas collecting tube through a gas collecting hood collection grating, an anaerobic tank, a sedimentation tank and other sewage treatment plants, and is introduced into an anoxic tank, autotrophic denitrification is carried out in a rear anoxic zone by using methane, hydrogen sulfide and the like as electron donors, the denitrification effect of the anoxic zone of a 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 in the foul gas is reduced. The aim of enhancing denitrification is achieved through the flow, and resources are fully and efficiently utilized.
Disclosure of Invention
The invention aims to provide a device and a method for realizing autotrophic denitrification reinforced denitrification through gas collection and circulation for reducing malodorous gas emission in low C/N ratio urban sewage denitrification. In the device, wastewater enters a continuous flow anaerobic/aerobic/anoxic biochemical tank, a carbon source is stored in an anaerobic stage, residual nitrate nitrogen in denitrification backflow sludge is nitrified in an aerobic zone, and a post anoxic zone utilizes the carbon source stored in the anaerobic stage to perform endogenous denitrification. The gas collecting device collects the odor containing hydrogen sulfide such as a grid, an anaerobic tank, a sedimentation tank and the like, and the odor is introduced into a rear anoxic zone through a gas collecting pipe, and the rear anoxic zone utilizes methane, hydrogen sulfide and the like as electron donors to perform autotrophic denitrification, so that the denitrification effect of the rear anoxic zone is enhanced. The invention does not need additional carbon source, fully utilizes resources, and can realize deep denitrification and malodorous gas reduction of low C/N urban sewage.
1. A device and a method for realizing autotrophic denitrification enhanced denitrification 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 connected PLC controller (4);
malodorous gas is respectively collected by a gas collecting and circulating device (1) into a grid gas collecting cover (1.1), an anaerobic tank gas collecting cover (1.2), a sedimentation tank gas collecting cover (1.4), gas in a mud storage tank gas collecting cover (1.5), and enters a gas collecting pipe (1.6) through a suction pump (1.7) to be introduced into an anoxic tank (2.3), gas generated by the anoxic tank enters the anoxic tank gas collecting cover (1.3), and can enter the gas collecting pipe (1.6) through the suction pump (1.7) to realize gas circulation, or is discharged through a blow-down pipe (1.8), and is introduced into the aerobic tank (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical pool (2), sequentially passes through the anaerobic pool (2.1), the aerobic pool (2.2) and the anoxic pool (2.3) and then goes out, wherein 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 pool (2); then the effluent enters a sedimentation tank (3), sludge is respectively returned to an anaerobic tank (2.1) and the anoxic tank (2.3) through a submersible sewage pump (3.1), and the residual sludge in the anoxic tank (2.3) is discharged to a sludge storage tank (3.2);
the PLC (4) is connected with a computer (4.2) through an automatic control box (4.1), controls an automatic control valve (4.4) and an air pipe valve (1.9), and detects dissolved oxygen, ammonia nitrogen, nitrate nitrogen and total nitrogen concentration through an on-line detection device (4.3) through a variable frequency blower (2.6) and an air pump (1.7). The on-line detection equipment is arranged at the aerobic end, the anoxic end and the water outlet. Wherein the aerobic tail end refers to the position where the aerobic aeration is finished in the forward direction of water flow; the anoxic terminal refers to the position where anoxic stirring is finished in the advancing direction of water flow,
the treatment process of the urban sewage treatment device comprises the following steps: the wastewater enters a continuous flow anaerobic/aerobic/anoxic biochemical pool, a carbon source is stored in an anaerobic stage, nitrate nitrogen in the returned sludge is removed by denitrification, nitrification is carried out in an aerobic zone, and the carbon source stored in the anaerobic stage is utilized by a post anoxic zone to carry out endogenous denitrification. The gas collecting device collects the odor containing hydrogen sulfide such as a grid, an anaerobic tank, a sedimentation tank and the like, and the odor is introduced into a rear anoxic zone through a gas collecting pipe, and the rear anoxic zone utilizes methane, hydrogen sulfide and the like as electron donors to perform autotrophic denitrification, so that the denitrification effect of the rear anoxic zone is enhanced. When the concentration of the odor containing hydrogen sulfide is excessive and is difficult to remove in the anoxic zone, the hydrogen sulfide gas is oxidized by the aeration action in the aerobic zone, and the contribution of synchronous nitrification, denitrification and denitrification in the aerobic zone is increased.
The invention relates to a device and a method for realizing autotrophic denitrification enhanced denitrification through gas collection and circulation, which are characterized by comprising the following steps:
(1) Continuous flow anaerobic/aerobic/anoxic initiation: taking municipal sewage treatment plant sludge as inoculated sludge and municipal sewage 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 6h; the valve which flows back to the anoxic tank is closed, and DO of the aerobic tank is 2-3mg/L; when the ammonia nitrogen concentration at the aerobic terminal is less than 5mg/L and is stably maintained for more than 5 days, the nitrification stage is considered to be successfully started; entering an endogenous denitrification starting stage, opening a valve for refluxing to the anoxic tank, and when the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent is less than 5mg/L, refluxing the sludge in the anoxic tank to 50% of the water inflow; when the sum of the nitrate nitrogen concentration and the nitrite concentration of the water outlet which is less than or equal to 5mg/L is less than or equal to 10mg/L, the amount of the sludge which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent is more than 10mg/L, the amount of sludge returned to the anoxic tank is 150 percent of the water inflow, and the endogenous denitrification stage is considered to be successfully started when the total nitrogen concentration of the effluent is less than 15mg/L and the total nitrogen concentration is stably maintained for more than 5 days;
(2) Starting a gas collection and circulation device: grilleThe gas collecting hood, the anaerobic tank gas collecting hood, the sedimentation tank gas collecting hood and the mud storage tank gas collecting hood are mutually communicated, odor in the communicated gas collecting hood is collected, and when the odor in the communicated gas collecting hood is H 2 S concentration > 100mg/m 3 Then the sucking pump is started to contain H 2 S and CH 4 Is led into an anoxic tank when the communicated gas collecting hood is H 2 S concentration is less than or equal to 40mg/m 3 Stopping the suction pump; the anoxic tank gas-collecting hood is independently arranged, when H is arranged in the anoxic gas-collecting hood 2 S concentration is less than or equal to 0.03mg/m 3 Directly discharging into the atmosphere; 10mg/m 3 H in oxygen-deficient pool gas-collecting hood 2 S concentration > 0.03mg/m 3 Starting an air pump of the anoxic tank to circulate air; inside H of top gas-collecting hood of anoxic tank 2 S concentration is more than or equal to 10mg/m 3 Opening an air pipe valve which is introduced into the aerobic tank, and when the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent after the gas is introduced is less than 10mg/L, indicating that the start of autotrophic denitrification is successful;
(3) Control of autotrophic and heterotrophic coupled denitrification: after the continuous flow anaerobic/aerobic/anoxic biochemical tank and the gas collecting and circulating device are successfully started, controlling the sludge concentration to be 3000-5000mg/L, and controlling the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank to be 12 hours, wherein the anaerobic tank is 3 hours, the aerobic tank is 3 hours and the anoxic tank is 6 hours; when the ammonia nitrogen concentration at the aerobic terminal is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1mg/L; when the concentration of the ammonia nitrogen at the tail end of the aerobic tank is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling the DO of the aerobic tank to be 1-2mg/L; the concentration of the aerobic tail ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4mg/L; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is less than 10mg/L, the effluent is communicated with the gas collecting hood H 2 S concentration higher than 100mg/m 3 When the air pump is started, H 2 S concentration is lower than 40mg/m 3 Stopping the air extracting pump, and intermittently introducing odor into the anoxic tank; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is more than or equal to 10mg/L, the air pump is kept in an on state, malodorous gas is continuously introduced, and meanwhile, anaerobic ammonia oxidation filler with the filling ratio of 10-20% is respectively added into the anaerobic/aerobic/anoxic tanks, so that the autotrophic denitrification effect is enhanced.
The device and the method for realizing autotrophic denitrification enhanced denitrification through gas collection and circulation have the following advantages compared with the prior art:
(1) The continuous flow anaerobic/aerobic/anoxic denitrification can fully utilize the carbon source in the raw water to realize deep nitrogen removal by nitrifying endogenous denitrification.
(2) The method fully utilizes the malodorous gas generated in the treatment process of common structures of sewage treatment plants to perform autotrophic denitrification, reduces the emission of harmful components in the malodorous gas, realizes the waste treatment with waste, and simultaneously can realize sludge reduction.
(2) Heterotrophic denitrification and autotrophic denitrification are coupled, denitrification is enhanced, carbon source demand is further reduced, and sewage treatment cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a device for realizing autotrophic denitrification enhanced denitrification 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 tank gas-collecting hood, 1.3 is an anoxic tank gas-collecting hood, 1.4 is an anaerobic tank gas-collecting hood, 1.5 is a mud storage tank gas-collecting hood, 1.6 is a gas collecting tube, 1.7 is an air pump, 1.8 is a blow-down 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 mud storage tank; 4.1 is an automatic control box, 4.2 is a computer, 4.3 is on-line detection equipment, and 4.4 is an automatic control valve.
The specific embodiment is as follows:
the invention is further described with reference to the drawings and the implementation: a device and a method for realizing autotrophic denitrification enhanced denitrification 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) connected in sequence and a connected PLC controller (4);
malodorous gas is respectively collected by a gas collecting and circulating device (1) into a grid gas collecting cover (1.1), an anaerobic tank gas collecting cover (1.2), a sedimentation tank gas collecting cover (1.4), gas in a mud storage tank gas collecting cover (1.5), and enters a gas collecting pipe (1.6) through a suction pump (1.7) to be introduced into an anoxic tank (2.3), gas generated by the anoxic tank enters the anoxic tank gas collecting cover (1.3), and can enter the gas collecting pipe (1.6) through the suction pump (1.7) to realize gas circulation, or is discharged through a blow-down pipe (1.8), and is introduced into the aerobic tank (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical pool (2), sequentially passes through the anaerobic pool (2.1), the aerobic pool (2.2) and the anoxic pool (2.3) and then goes out, wherein 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 pool (2); then the effluent enters a sedimentation tank (3), sludge is respectively returned to an anaerobic tank (2.1) and the anoxic tank (2.3) through a submersible sewage pump (3.1), and the residual sludge in the anoxic tank (2.3) is discharged to a sludge storage tank (3.2);
the PLC controller (4) is connected with the computer (4.2) through the automatic control box (4.1), controls the automatic control valve (4.4), the variable frequency blower (2.6) and the air pump (1.7), and detects the concentration of dissolved oxygen, ammonia nitrogen, nitrate nitrogen and total nitrogen through the on-line detection equipment (4.3).
The specific operation is as follows:
(1) Taking municipal sewage treatment plant sludge as inoculated sludge and municipal sewage 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 6h; 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 the online dissolved oxygen concentration meter detects DO 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 is detected to be higher than 2mg/L by the online dissolved oxygen concentration meter, the frequency of the fan is increased by the PLC controller so as to improve the air quantity, so that the DO of the aerobic tank is maintained to be 2-3mg/L, and nitrified sludge is enriched; when the ammonia nitrogen concentration at the aerobic terminal is less than 5mg/L and the ammonia nitrogen concentration is stably maintained for more than 5 days, the nitrification stage is considered to be successfully started;
(2) And opening a valve for refluxing to the anoxic stage, and increasing the sludge concentration of the anoxic tank so as to increase the biomass of the post denitrification zone and increase the denitrification rate. When the sum of the nitrate nitrogen and the nitrite concentration of the effluent is less than 5mg/L, regulating the amount of the sludge which flows back to the anoxic tank to be 50 percent of the inflow through a valve and a submersible sewage pump; when the sum of the nitrate nitrogen concentration and the nitrite concentration of the water outlet which is less than or equal to 5mg/L is less than or equal to 10mg/L, the amount of the sludge which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent is more than 10mg/L, and the amount of the sludge returned to the anoxic tank is 150 percent of the water inflow. And simultaneously, the ammonia nitrogen concentration at the aerobic tail end is used for adjusting the aeration quantity so as to maintain the stable nitrification effect at the stage. When the ammonia nitrogen concentration at the aerobic terminal is less than 1mg/L, the DO of the aerobic tank is reduced to 0.5-1mg/L by adjusting the air quantity through a variable frequency blower; when the concentration of the ammonia nitrogen at the tail end of the aerobic tank is more than or equal to 1mg/L and less than or equal to 5mg/L, the DO of the aerobic tank is controlled to be 1-2mg/L by a variable-frequency blower; the ammonia nitrogen concentration of the aerobic end is more than 5mg/L, DO of the aerobic tank is controlled to be 2-4mg/L through a variable frequency blower, the total nitrogen concentration measured by an on-line total nitrogen concentration meter at the anoxic end is less than 15mg/L, and the endogenous denitrification stage is considered to be successfully started after the anoxic end is stably maintained for more than 5 days. When the total nitrogen concentration of the effluent is less than 15mg/L and is stably maintained for more than 5 days, the endogenous denitrification stage is considered to be successfully started;
(3) The odor of sewage treatment plant structures such as a gas collecting hood collecting grid, an anaerobic tank, a sedimentation tank, a mud storage tank and the like is collected by the gas collecting hood, the rest gas collecting hoods except the anoxic tank gas collecting hood are mutually communicated, and when H is in the communicated gas collecting hoods 2 S concentration higher than 100mg/m 3 Starting the air pump to contain H 2 S and CH 4 Is introduced into an anoxic tank when H 2 S concentration is less than 40mg/m 3 The pump is stopped. H in anoxic tank gas collecting hood 2 S concentration is less than or equal to 0.03mg/m 3 Then directly vented to atmosphere; h in anoxic tank gas collecting hood 2 S concentration is greater than 0.03mg/m 3 But less than 10mg/m 3 Starting an air pump of the anoxic tank to circulate air; h in anoxic tank gas collecting hood 2 S concentration is greater than or equal to 10mg/m 3 Opening an air pipe valve which is led into the aerobic tank to enable excessive H 2 Oxidation of S to SO 4 2- Remove at the same time part H 2 S, denitrification is carried out in an aerobic tank to continuously remove part of total nitrogen. When the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent after the gas is introduced is less than 10mg/L, the autotrophic denitrification is successfully started;
(3) After the continuous flow anaerobic/aerobic/anoxic biochemical tank and the gas collecting and circulating device are successfully started, controlling the sludge concentration to be 3000-5000mg/L, and controlling the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank to be 12 hours, wherein the anaerobic tank is 3 hours, the aerobic tank is 3 hours and the anoxic tank is 6 hours; when the ammonia nitrogen concentration at the aerobic terminal is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1mg/L; when the concentration of the aerobic terminal ammonia nitrogen is more than or equal to 1mg/L and is less than or equal to 5mg/L, the control is carried outDO of the aerobic tank is 1-2mg/L; the concentration of the aerobic tail ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4mg/L; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is less than 10mg/L, the effluent is used as a gas collecting hood H 2 S concentration higher than 100mg/m 3 When the air pump is started, H 2 S concentration is lower than 40mg/m 3 Stopping the air extracting pump, and intermittently introducing odor into the anoxic tank; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is more than or equal to 10mg/L, the air pump is kept in an open state, and malodorous gas is continuously introduced to increase H 2 S is introduced into the anoxic tank for strengthening autotrophic denitrification. Simultaneously, anaerobic ammonia oxidation filling materials with the filling ratio of 10-20% are respectively added into the anaerobic/aerobic/anoxic tanks, and an anaerobic ammonia oxidation autotrophic denitrification path is introduced to further strengthen autotrophic denitrification.
The foregoing is illustrative of the present invention and is not intended to be limiting, as the invention may be more readily understood and practiced by those skilled in the art, and as such, simply modified within the scope of this invention.

Claims (1)

1. The device used in the method comprises a gas collecting and circulating device (1), a continuous flow anaerobic/aerobic/anoxic biochemical tank (2), a sedimentation tank (3) and a connected PLC (4);
malodorous gas is respectively collected by a gas collecting and circulating device (1) into a grid gas collecting cover (1.1), an anaerobic tank gas collecting cover (1.2), a sedimentation tank gas collecting cover (1.4), gas in a mud storage tank gas collecting cover (1.5), and enters a gas collecting pipe (1.6) through a suction pump (1.7) to be introduced into an anoxic tank (2.3), gas generated by the anoxic tank enters the anoxic tank gas collecting cover (1.3), and can enter the gas collecting pipe (1.6) through the suction pump (1.7) to realize gas circulation, or is discharged through a blow-down pipe (1.8), and is introduced into the aerobic tank (2.2) through an air pipe valve (1.9);
sewage enters a continuous flow anaerobic/aerobic/anoxic biochemical pool (2), sequentially passes through the anaerobic pool (2.1), the aerobic pool (2.2) and the anoxic pool (2.3) and then goes out, wherein 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 pool (2); then the effluent enters a sedimentation tank (3), sludge is respectively returned to an anaerobic tank (2.1) and the anoxic tank (2.3) through a submersible sewage pump (3.1), and the residual sludge in the anoxic tank (2.3) is discharged to a sludge storage tank (3.2);
the PLC (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 method is characterized by comprising the following steps of:
(1) Continuous flow anaerobic/aerobic/anoxic initiation: taking municipal sewage treatment plant sludge as inoculated sludge and municipal sewage 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 6h; the valve which flows back to the anoxic tank is closed, and DO of the aerobic tank is 2-3mg/L; when the ammonia nitrogen concentration at the aerobic terminal is less than 5mg/L and is stably maintained for more than 5 days, the nitrification stage is considered to be successfully started; entering an endogenous denitrification starting stage, opening a valve for refluxing to the anoxic tank, and when the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent is less than 5mg/L, refluxing the sludge in the anoxic tank to 50% of the water inflow; when the sum of the nitrate nitrogen concentration and the nitrite concentration of the water outlet which is less than or equal to 5mg/L is less than or equal to 10mg/L, the amount of the sludge which flows back to the anoxic tank is 100 percent of the water inflow; the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent is more than 10mg/L, the amount of sludge returned to the anoxic tank is 150 percent of the water inflow, and the endogenous denitrification stage is considered to be successfully started when the total nitrogen concentration of the effluent is less than 15mg/L and the total nitrogen concentration is stably maintained for more than 5 days;
(2) Starting a gas collection and circulation device: grid gas collecting hood, anaerobic tank gas collecting hood, sedimentation tank gas collecting hood, mud storage tank gas collecting hood are mutually communicated, odor in the communicated gas collecting hood is collected, and when the odor in the communicated gas collecting hood is H 2 S concentration > 100mg/m 3 Then the sucking pump is started to contain H 2 S and CH 4 Is led into an anoxic tank when the communicated gas collecting hood is H 2 S concentration is less than or equal to 40mg/m 3 Stopping the suction pump; the anoxic tank gas-collecting hood is independently arranged, when H is arranged in the anoxic gas-collecting hood 2 S concentration is less than or equal to 0.03mg/m 3 Directly discharging into the atmosphere; 10mg/m 3 H in oxygen-deficient pool gas-collecting hood 2 S concentration > 0.03mg/m 3 Starting an air pump of the anoxic tank to circulate air; inside H of top gas-collecting hood of anoxic tank 2 S concentration is more than or equal to 10mg/m 3 Opening an air pipe valve which is introduced into the aerobic tank, and when the sum of the nitrate nitrogen concentration and the nitrite concentration of the effluent after the gas is introduced is less than 10mg/L, indicating that the start of autotrophic denitrification is successful;
(3) Control of autotrophic and heterotrophic coupled denitrification: after the continuous flow anaerobic/aerobic/anoxic biochemical tank and the gas collecting and circulating device are successfully started, controlling the sludge concentration to be 3000-5000mg/L, and controlling the hydraulic retention time of the continuous flow anaerobic/aerobic/anoxic biochemical tank to be 12 hours, wherein the anaerobic tank is 3 hours, the aerobic tank is 3 hours and the anoxic tank is 6 hours; when the ammonia nitrogen concentration at the aerobic terminal is less than 1mg/L, the DO of the aerobic tank is controlled to be 0.5-1mg/L; when the concentration of the ammonia nitrogen at the tail end of the aerobic tank is more than or equal to 1mg/L and less than or equal to 5mg/L, controlling the DO of the aerobic tank to be 1-2mg/L; the concentration of the aerobic tail ammonia nitrogen is more than 5mg/L, and the DO of the aerobic tank is 2-4mg/L; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is less than 10mg/L, the effluent is communicated with the gas collecting hood H 2 S concentration higher than 100mg/m 3 When the air pump is started, H 2 S concentration is lower than 40mg/m 3 Stopping the air extracting pump, and intermittently introducing odor into the anoxic tank; when the sum of the nitrate nitrogen and the nitrite concentration of the effluent is more than or equal to 10mg/L, the air pump is kept in an on state, malodorous gas is continuously introduced, and meanwhile, anaerobic ammonia oxidation filler with the filling ratio of 10-20% is respectively added into the anaerobic/aerobic/anoxic tanks, so that the autotrophic denitrification effect is enhanced.
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