CN112158952B - Device and method for treating low-carbon-nitrogen-ratio wastewater through continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification - Google Patents

Device and method for treating low-carbon-nitrogen-ratio wastewater through continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification Download PDF

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CN112158952B
CN112158952B CN202010926804.XA CN202010926804A CN112158952B CN 112158952 B CN112158952 B CN 112158952B CN 202010926804 A CN202010926804 A CN 202010926804A CN 112158952 B CN112158952 B CN 112158952B
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彭永臻
李文宇
高锐涛
张琼
邓丽艳
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Beijing University of Technology
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/303Nitrification and denitrification treatment characterised by the nitrification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/305Nitrification and denitrification treatment characterised by the denitrification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/307Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00Aeration of stretches of water
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/06Nutrients for stimulating the growth of microorganisms
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

A device and a method for treating wastewater with low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) short-cut nitrification and anaerobic ammonia oxidation coupled sludge fermentation denitrification belong to the field of biological sewage treatment. The device comprises a raw water tank, a continuous flow AOA reactor, a sedimentation tank, a sludge fermentation tank and a sludge storage tank. Part of domestic sewage enters an anaerobic section of the continuous flow reactor to store internal carbon sources and then enters an aerobic section to complete the short-cut nitrification reaction, and then the domestic sewage is rich in NO2 The effluent of the-N enters an anoxic section, the other part of raw water is mixed with the returned sludge fermentation product and then enters the anoxic section, and NH is removed under the action of the fixed anaerobic ammonium oxidation bacteria filler4 +-N and NO2 -N; NO produced by anammox reaction3 And N is removed through denitrification, and the residual sludge enters an intermediate sludge storage tank after fermentation and is continuously added to an anoxic section to provide a carbon source for denitrification. The invention fully utilizes the raw water and organic matters generated by sludge fermentation, improves the denitrification efficiency, is beneficial to sludge reduction, and realizes the deep denitrification of the urban domestic sewage with low carbon-nitrogen ratio.

Description

Device and method for treating low-carbon-nitrogen-ratio wastewater through continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification
Technical Field
The invention relates to a device and a method for treating wastewater with low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) short-range nitrification and anaerobic ammonia oxidation coupled sludge fermentation denitrification, belonging to the field of biological sewage treatment and being suitable for deep denitrification and sludge reduction of urban domestic sewage.
Background
Along with the social progress and the improvement of the living standard of people, the amount of nitrogen and phosphorus-containing wastewater such as urban sewage, industrial wastewater and the like generated by human activities is increased, the eutrophication of water bodies is aggravated, and the ecological environment is seriously damaged. Although the traditional nitrification and denitrification process can effectively remove part of nitrogen and phosphorus pollutants in sewage, the traditional nitrification and denitrification process has the problems of insufficient carbon source, high energy consumption, low denitrification efficiency and the like, so that the development of a more efficient and energy-saving denitrification process is the direction of current research. The novel process adopted at present mainly comprises short-cut nitrification, short-cut denitrification, anaerobic ammonia oxidation and the like, and has remarkable advantages and wide development prospect. In addition, a large amount of sludge is generated in the sewage treatment process, secondary pollution is generated to the urban environment without treatment, the sludge treatment modes adopted at present are various, such as sludge fermentation, sludge composting, sludge digestion and the like, and the mode of utilizing the product obtained after sludge fermentation as the raw water carbon source has great research potential due to insufficient carbon source of urban domestic sewage.
The traditional nitrification and denitrification process refers to a process that ammonia nitrogen in sewage is converted into nitrate nitrogen by nitrifying bacteria under an aerobic condition and then is converted into nitrogen by denitrifying bacteria under an anoxic condition so as to be removed. The short-cut nitrification is a process that ammonia nitrogen in an aerobic environment is converted into nitrite nitrogen under the action of nitrosobacteria (AOB) and is not further converted into nitrate nitrogen, and the process has the advantages of saving aeration quantity, little sludge production and energy, and has the difficulty of nitrite nitrogen accumulation, and is usually realized by adopting intermittent aeration or adding hydroxylamine inhibitor; the anaerobic ammonia oxidation refers to a process that ammonia nitrogen and nitrite nitrogen are converted into nitrogen by anaerobic ammonia oxidation bacteria in a certain proportion under an anoxic condition and simultaneously generate a small amount of nitrate nitrogen, the process has the advantages of saving a carbon source, saving cost, producing a small amount of sludge and the like, the difficulties are the problem of retention of the anaerobic ammonia oxidation bacteria and the problem of source of substrate nitrite, the anaerobic ammonia oxidation bacteria are generally retained by adding a filler, and the substrate nitrite is obtained by utilizing short-cut nitrification or short-cut denitrification.
Nitrate nitrogen produced in the anaerobic ammonia oxidation process is possible to cause the nitrate nitrogen content of the effluent to be not up to the standard, and the generated nitrate nitrogen can be further removed by adding a certain amount of organic matters as a carbon source to be coupled with denitrification reaction, so that the effluent quality is improved. Anaerobic ammonia oxidation coupled with denitrification has many advantages. First, the denitrification process consumes organic matter to produce CO2The strengthening of the anaerobic environment is beneficial to the growth of anaerobic ammonium oxidation bacteria; secondly, nitrite nitrogen generated in the denitrification process is possibly utilized by anaerobic ammonia oxidation bacteria to provide a substrate for anaerobic ammonia oxidation reaction; meanwhile, the organic matter is used as a main substance of synthetic cells, so that the growth of anaerobic ammonium oxidation bacteria can be promoted to a certain extent, and the denitrification performance of the system is improved.
According to the invention, one part of municipal sewage is pumped into the anaerobic section of the continuous flow AOA reactor, the other part of municipal sewage is pumped into the anoxic section of the continuous flow AOA reactor, organic matters generated by sludge fermentation are refluxed to the anoxic section, short-range nitration reaction is carried out in the aerobic section, and anaerobic ammonia oxidation coupling denitrification reaction is carried out in the anoxic section, so that the deep denitrification of the municipal sewage with low carbon nitrogen ratio is enhanced while the sludge reduction is realized, and the method has the advantages of low energy consumption, high resource utilization rate and low cost.
Disclosure of Invention
The invention aims to provide a device and a method for treating wastewater with low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) short-cut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification, and particularly, part of municipal domestic sewage enters a continuous flow AOA reactor, an anaerobic section fully utilizes a carbon source in raw water organic matter storage by stirring, and an aerobic section carries out short-cut nitrification by low-oxygen aeration so as to convert raw water ammonia nitrogen into nitrite nitrogen; and the other part of the municipal domestic sewage directly enters the anoxic section to be mixed with the effluent of the aerobic section, nitrogen and partial nitrate nitrogen are generated under the action of the fixed anaerobic ammonia oxidation biomembrane, and simultaneously the residual sludge generated by the reactor is fermented and then flows back to the anoxic section to provide a carbon source for the process of removing the nitrate nitrogen by denitrification, so that the nitrate nitrogen generated by the anaerobic ammonia oxidation reaction is removed, and the deep denitrification of the sewage is realized. The invention mainly aims to solve the problems of insufficient carbon source, low efficiency and high energy consumption in the sewage treatment process and simultaneously carry out deep denitrification.
The purpose of the invention is realized by the following technical scheme:
the device and the method for treating the wastewater with low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification are characterized by comprising the following steps of: comprises a raw water tank (1) of urban domestic sewage, a continuous flow AOA reactor (3), a sedimentation tank (4), a sludge fermentation tank (5) and a sludge storage tank (6) which are connected in sequence, wherein the aeration and stirring processes are all completed by an online monitoring system and a feedback control system;
the urban domestic sewage raw water tank (1) is provided with a raw water tank overflow pipe (1-1) and a raw water tank emptying valve (1-2); one part of the urban domestic sewage enters the anaerobic section (3-1) of the continuous flow AOA reactor through a water inlet pump (2-1), and the other part of the urban domestic sewage enters the anoxic section (3-3) of the continuous flow AOA reactor through an overrunning water inlet pump (2-2); the continuous flow AOA reactor (3) comprises an anaerobic section (3-1), an aerobic section (3-2) and an anoxic section (3-3); the anaerobic section (3-1) is provided with an anaerobic stirring device (3-4); the aerobic section (3-2) is provided with an aeration device which comprises an air pump (3-6), an aeration pipe (3-7), an aeration head (3-8) and a pH/DO tester (3-9); the anoxic section (3-3) is provided with an anoxic stirring device (3-5) and a fixed anaerobic ammonia oxidation filler (3-10); the effluent of the anoxic section (3-3) enters a sedimentation tank (4); one part of sludge at the bottom of the sedimentation tank (4) returns to the anaerobic section (3-1) through a sludge return pump (4-1), the other part enters a sludge fermentation tank (5) through a sludge discharge pump (4-2), and treated effluent is discharged through a water outlet pipe (4-3); a sludge stirring device (5-1) is arranged in the sludge fermentation tank (5) for anaerobic fermentation of sludge, a heat insulation layer (5-3) is arranged outside the sludge fermentation tank, and sludge fermentation products enter a sludge storage tank (6) through a valve (5-2); the sludge storage tank (6) is provided with a sludge storage tank overflow pipe (6-2) and a sludge storage tank emptying valve (6-3), and the stored sludge fermentation product flows back to the anoxic section (3-3) of the continuous flow AOA reactor through a sludge pump (6-1).
The method according to the device is characterized by comprising the following steps:
1) the process is started:
1.1) continuous flow AOA reactor: inoculating short-cut nitrification floc sludge into the continuous flow AOA reactor (3), and keeping the sludge concentration in the continuous flow AOA reactor (3) at 2500-5000 mg/L; the influent water is urban domestic sewage, COD: 150-200mg/L, NH4 +-N: 60-80mg/L, and C/N is 2-3; the hydraulic retention time of the system is 8-15h, and the sludge reflux ratio is 150%; the concentration of dissolved oxygen is controlled to be 1.0-2.0mg/L, and the sludge age is 20 days; maintaining the working condition until the ammonia nitrogen concentration in the effluent is reduced to below 2mg/L, and completing the start of the short-cut nitrification when the nitrite accumulation rate of the aerobic section (3-2) is stabilized to above 85 percent and the duration time exceeds 15 days; inoculating and fixing anaerobic ammonia oxidation filler to the anoxic section (3-3), wherein the filler filling ratio is 30% -80%, and the filler adding form is fixed; when the total nitrogen of the effluent of the continuous flow AOA reactor (3) is less than or equal to 10mg/L, NH4 +If N is less than or equal to 2mg/L, the starting is considered to be successful;
1.2) sludge fermentation: the sludge of the sludge fermentation tank (5) is derived from the sludge of the sedimentation tank (4) generated by the continuous flow AOA reactor (3), the operation is carried out intermittently, the operation comprises two periods every day, each period is 12 hours, the sludge feeding time is 20 minutes, the sludge discharging ratio is 50 percent, the rest time is anaerobic stirring, and the sludge age is controlled to be 30 d; the continuous flow AOA reactor (3) is started and at the initial stage, fermented sludge of a sewage plant is added into a sludge storage tank (6) and directly enters an anoxic section (3-3), and the reflux ratio of a fermented product is 50% -100%; measuring the sludge concentration in the continuous flow AOA reactor (3) regularly every day, stopping adding the sewage plant fermentation sludge into the sludge storage tank (6) when the sludge concentration is more than 5000mg/L, and successfully starting the sludge fermentation tank;
2) the process after starting is operated:
2.1) continuous flow AOA reactor: the anaerobic section (3-3) fixes the anaerobic ammonia oxidation filler (3-10) with the filling ratio of 30-80%, the hydraulic retention time of the system is 8-15h, the sludge reflux ratio is 150%, the dissolved oxygen concentration of the aerobic section (3-2) is controlled to be 1.0-2.0mg/L, the sludge age of the system is 20d, the sludge concentration of the system is 2500-5000mg/L, and the sludge discharge ratio of the sedimentation tank (4) entering a sludge fermentation tank is 50-100%; water quality of inlet water: pH is 7.1-7.9, COD concentration is 150-4 +-N concentration of 60-80mg/L, NO2 --N and NO3 --N is all below 1mg/L, the C/N ratio is 2-3;
sludge fermentation: the sludge fermentation tank (5) adopts an intermittent operation mode, and comprises two periods every day, wherein each period is 12 hours, and comprises 20 minutes of sludge feeding, 20 minutes of sludge discharging, 50 percent of sludge discharging ratio and the rest time of anaerobic stirring, and the sludge age is 30 d; after entering a sludge storage tank (6), fermented substances are continuously pumped into an anoxic section (3-3) through a sludge pump (6-1), the sludge concentration in the continuous flow AOA reactor (3) is periodically measured in the operation process, if the sludge concentration is less than or equal to 5000mg/L, sludge is not discharged from the reactor, and simultaneously sludge fermented by a sewage plant is added into the sludge storage tank (6) to supplement sludge fermented substances; if the sludge concentration is more than 5000mg/L, the residual sludge in the sedimentation tank is utilized for fermentation, and the reflux ratio of the fermentation product is 50-100%.
Compared with the traditional nitrification and denitrification process, the device and the method for treating the wastewater with the low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) short-range nitrification and anaerobic ammonia oxidation coupled sludge fermentation denitrification provided by the invention have the following advantages:
1) organic matters in raw water and self excess sludge fermentation products are fully utilized as carbon sources, by-products of anaerobic ammonia oxidation reaction are removed through denitrification, the denitrification efficiency of the system is improved, and the quality of effluent water is improved;
2) the stable maintenance of the short-cut nitrification is facilitated through the low-oxygen aeration, the aeration energy consumption can be saved, and the treatment cost is reduced;
3) the sludge fermentation product completes the continuous feeding process by arranging the middle sludge storage box, and the carbon source in the reactor is supplemented uninterruptedly, thereby being beneficial to the denitrification reaction and the utilization of the carbon source by the microbial synthesis.
Drawings
FIG. 1 is a schematic structural diagram of a device for realizing deep denitrification of municipal sewage by coupling continuous flow shortcut nitrification-anaerobic ammonia oxidation denitrification and sludge fermentation reflux:
in the figure: 1-city domestic sewage raw water tank; 1-raw water tank overflow pipe; 1-2-raw water tank emptying valve; 2-1-a water inlet pump; 2-overrunning water inlet pump; 3-continuous flow AOA reactor; 3-1-anaerobic section; 3-2-aerobic section; 3-anoxic zone; 3-4-anaerobic stirring device; 3-5-an anoxic stirring device; 3-6-air pump; 3-7-an aeration pipe; 3-8-aeration head; 3-9-pH/DO determinator; 3-10-fixing anaerobic ammonium oxidation filler; 4, a sedimentation tank; 4-1-sludge reflux pump; 4-2-a dredge pump; 4-3-water outlet pipe; 5, a sludge fermentation tank; 5-1-sludge stirring device; 5-2-valve; 5-3-heat insulation layer; 6, a sludge storage tank; 6-1-sludge pump; 6-2-overflow pipe of sludge storage tank; 6-3-emptying valve of sludge storage tank.
Detailed Description
The invention is described in detail with reference to the accompanying drawings and examples.
The device and the method for treating the wastewater with low carbon-nitrogen ratio by continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification are characterized by comprising the following steps of: comprises a raw water tank (1) of urban domestic sewage, a continuous flow AOA reactor (3), a sedimentation tank (4), a sludge fermentation tank (5) and a sludge storage tank (6) which are connected in sequence, wherein the aeration and stirring processes are completed by an online monitoring system and a feedback control system;
the urban domestic sewage raw water tank (1) is provided with a raw water tank overflow pipe (1-1) and a raw water tank emptying valve (1-2); one part of the urban domestic sewage enters the anaerobic section (3-1) of the continuous flow AOA reactor through a water inlet pump (2-1), and the other part of the urban domestic sewage enters the anoxic section (3-3) of the continuous flow AOA reactor through an overrunning water inlet pump (2-2); the continuous flow AOA reactor (3) comprises an anaerobic section (3-1), an aerobic section (3-2) and an anoxic section (3-3); the anaerobic section (3-1) is provided with an anaerobic stirring device (3-4); the aerobic section (3-2) is provided with an aeration device which comprises an air pump (3-6), an aeration pipe (3-7), an aeration head (3-8) and a pH/DO tester (3-9); the anoxic section (3-3) is provided with an anoxic stirring device (3-5) and a fixed anaerobic ammonia oxidation filler (3-10); the effluent of the anoxic section (3-3) enters a sedimentation tank (4); one part of sludge at the bottom of the sedimentation tank (4) returns to the aerobic section (3-1) through a sludge return pump (4-1), the other part enters a sludge fermentation tank (5) through a sludge discharge pump (4-2), and treated effluent is discharged through a water outlet pipe (4-3); a sludge stirring device (5-1) is arranged in the sludge fermentation tank (5) for anaerobic fermentation of sludge, a heat insulation layer (5-3) is arranged outside the sludge fermentation tank, and sludge fermentation products enter a sludge storage tank (6) through a valve (5-2); the sludge storage tank (6) is provided with a sludge storage tank overflow pipe (6-2) and a sludge storage tank emptying valve (6-3), and the stored sludge fermentation product flows back to the anoxic section (3-3) of the continuous flow AOA reactor through a sludge pump (6-1).
The method according to the device is characterized by comprising the following steps:
1) the process is started:
1.1) continuous flow AOA reactor: inoculating short-range nitrification floc sludge into the continuous flow AOA reactor (3), and keeping the sludge concentration in the continuous flow AOA reactor (3) at 2500-5000 mg/L; the influent water is urban domestic sewage, COD: 150-200mg/L, NH4 +-N: 60-80mg/L, and C/N is 2-3; the hydraulic retention time of the system is 8-15h, and the sludge reflux ratio is 150%; the concentration of dissolved oxygen is controlled to be 1.0-2.0mg/L, and the sludge age is 20 days; maintaining the working condition until the ammonia nitrogen concentration in the effluent is reduced to below 2mg/L, and completing the start of the short-cut nitrification when the nitrite accumulation rate of the aerobic section (3-2) is stabilized to above 85 percent and the duration time exceeds 15 days; inoculating and fixing anaerobic ammonia oxidation filler to the anoxic section (3-3), wherein the filler filling ratio is 30% -80%, and the filler adding form is fixed; when the total nitrogen of the effluent of the continuous flow AOA reactor (3) is less than or equal to 10mg/L, NH4 +The start is considered to be successful if N is less than or equal to 2mg/L;
1.2) sludge fermentation: the sludge of the sludge fermentation tank (5) is derived from the sludge of the sedimentation tank (4) generated by the continuous flow AOA reactor (3), the operation is carried out intermittently, the operation comprises two periods every day, each period is 12 hours, the sludge feeding time is 20 minutes, the sludge discharging ratio is 50 percent, the rest time is anaerobic stirring, and the sludge age is controlled to be 30 d; the continuous flow AOA reactor (3) is started and at the initial stage, fermented sludge of a sewage plant is added into a sludge storage tank (6) and directly enters an anoxic section (3-3), and the reflux ratio of a fermented product is 50% -100%; measuring the sludge concentration in the continuous flow AOA reactor (3) regularly every day, stopping adding the sewage plant fermentation sludge into the sludge storage tank (6) when the sludge concentration is more than 5000mg/L, and successfully starting the sludge fermentation tank;
2) the process after starting is operated:
2.1) continuous flow AOA reactor: the anaerobic section (3-3) fixes the anaerobic ammonia oxidation filler (3-10) with the filling ratio of 30-80%, the hydraulic retention time of the system is 8-15h, the sludge reflux ratio is 150%, the dissolved oxygen concentration of the aerobic section (3-2) is controlled to be 1.0-2.0mg/L, the sludge age of the system is 20d, the sludge concentration of the system is 2500-5000mg/L, and the sludge discharge ratio of the sedimentation tank (4) entering a sludge fermentation tank is 50-100%; water quality of inlet water: pH is 7.1-7.9, COD concentration is 150-4 +-N concentration of 60-80mg/L, NO2 --N and NO3 --N is all below 1mg/L, the C/N ratio is 2-3;
2.2) sludge fermentation: the sludge fermentation tank (5) adopts an intermittent operation mode, and comprises two periods every day, wherein each period is 12 hours, and comprises 20 minutes of sludge feeding, 20 minutes of sludge discharging, 50 percent of sludge discharging ratio and the rest time of anaerobic stirring, and the sludge age is 30 d; after entering a sludge storage tank (6), fermented substances are continuously pumped into an anoxic section (3-3) through a sludge pump (6-1), the sludge concentration in the continuous flow AOA reactor (3) is periodically measured in the operation process, if the sludge concentration is less than or equal to 5000mg/L, sludge is not discharged from the reactor, and simultaneously sludge fermented by a sewage plant is added into the sludge storage tank (6) to supplement sludge fermented substances; if the sludge concentration is more than 5000mg/L, the residual sludge in the sedimentation tank is utilized for fermentation, and the reflux ratio of the fermentation product is 50-100%.

Claims (1)

1. The continuous flow AOA short-cut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification method for treating wastewater with low carbon-nitrogen ratio comprises a device used by the method, wherein the device comprises an urban domestic sewage raw water tank (1), a continuous flow AOA reactor (3), a sedimentation tank (4), a sludge fermentation tank (5) and a sludge storage tank (6) which are sequentially connected, and the aeration and stirring processes are completed by an online monitoring system and a feedback control system; the continuous flow AOA reactor (3) comprises an anaerobic section (3-1), an aerobic section (3-2) and an anoxic section (3-3), wherein the volume of the anaerobic section (3-1): volume of aerobic zone (3-2): the volume of the anoxic section (3-3) is 1: 1: 2;
the urban domestic sewage raw water tank (1) is provided with a raw water tank overflow pipe (1-1) and a raw water tank emptying valve (1-2); one part of the urban domestic sewage enters the anaerobic section (3-1) of the continuous flow AOA reactor through a water inlet pump (2-1), and the other part of the urban domestic sewage enters the anoxic section (3-3) of the continuous flow AOA reactor through an overrunning water inlet pump (2-2); the continuous flow AOA reactor (3) comprises an anaerobic section (3-1), an aerobic section (3-2) and an anoxic section (3-3); the anaerobic section (3-1) is provided with an anaerobic stirring device (3-4); the aerobic section (3-2) is provided with an aeration device which comprises an air pump (3-6), an aeration pipe (3-7), an aeration head (3-8) and a pH/DO tester (3-9); the anoxic section (3-3) is provided with an anoxic stirring device (3-5) and a fixed anaerobic ammonia oxidation filler (3-10); the effluent of the anoxic section (3-3) enters a sedimentation tank (4); one part of sludge at the bottom of the sedimentation tank (4) returns to the anaerobic section (3-1) through a sludge return pump (4-1), the other part enters a sludge fermentation tank (5) through a sludge discharge pump (4-2), and treated effluent is discharged through a water outlet pipe (4-3); a sludge stirring device (5-1) is arranged in the sludge fermentation tank (5) for anaerobic fermentation of sludge, a heat insulation layer (5-3) is arranged outside the sludge fermentation tank, and sludge fermentation products enter a sludge storage tank (6) through a valve (5-2); the sludge storage tank (6) is provided with a sludge storage tank overflow pipe (6-2) and a sludge storage tank emptying valve (6-3), and the stored sludge fermentation product flows back to the anoxic section (3-3) of the continuous flow AOA reactor through a sludge pump (6-1);
the method is characterized by comprising the following steps:
1) the process is started:
1.1) continuous flow AOA reactor: inoculating short-cut nitrification floc sludge into the continuous flow AOA reactor (3), and keeping the sludge concentration in the continuous flow AOA reactor (3) at 2500-5000 mg/L; the influent water is urban domestic sewage, COD: 150-200mg/L, NH4 +-N: 60-80mg/L, and C/N is 2-3; hydraulic retention time of systemThe sludge reflux ratio is 150 percent for 8 to 15 hours; the concentration of dissolved oxygen is controlled to be 1.0-2.0mg/L, and the sludge age is 20 days; maintaining the working condition until the ammonia nitrogen concentration in the effluent is reduced to below 2mg/L, and completing the start of the short-cut nitrification when the nitrite accumulation rate of the aerobic section (3-2) is stabilized to above 85 percent and the duration time exceeds 15 days; inoculating and fixing anaerobic ammonia oxidation filler to the anoxic section (3-3), wherein the filler filling ratio is 30% -80%, and the filler adding form is fixed; when the total nitrogen of the effluent of the continuous flow AOA reactor (3) is less than or equal to 10mg/L, NH4 +If N is less than or equal to 2mg/L, the starting is considered to be successful;
1.2) sludge fermentation: the sludge of the sludge fermentation tank (5) is derived from the sludge of the sedimentation tank (4) generated by the continuous flow AOA reactor (3), the operation is carried out intermittently, the operation comprises two periods every day, each period is 12 hours, the sludge feeding time is 20 minutes, the sludge discharging ratio is 50 percent, the rest time is anaerobic stirring, and the sludge age is controlled to be 30 d; the continuous flow AOA reactor (3) is started and at the initial stage, fermented sludge of a sewage plant is added into a sludge storage tank (6) and directly enters an anoxic section (3-3), and the reflux ratio of a fermented product is 50% -100%; measuring the sludge concentration in the continuous flow AOA reactor (3) regularly every day, stopping adding the sewage plant fermentation sludge into the sludge storage tank (6) when the sludge concentration is more than 5000mg/L, and successfully starting the sludge fermentation tank;
2) the process after starting is operated:
2.1) continuous flow AOA reactor: the anaerobic section (3-3) fixes the anaerobic ammonia oxidation filler (3-10) with the filling ratio of 30-80%, the hydraulic retention time of the system is 8-15h, the sludge reflux ratio is 150%, the dissolved oxygen concentration of the aerobic section (3-2) is controlled to be 1.0-2.0mg/L, the sludge age of the system is 20d, the sludge concentration of the system is 2500-5000mg/L, and the sludge discharge ratio of the sedimentation tank (4) entering a sludge fermentation tank is 50-100%; water quality of inlet water: pH is 7.1-7.9, COD concentration is 150-4 +-N concentration of 60-80mg/L, NO2 --N and NO3 --N is all below 1mg/L, the C/N ratio is 2-3;
2.2) sludge fermentation: the sludge fermentation tank (5) adopts an intermittent operation mode, and comprises two periods every day, wherein each period is 12 hours, and comprises 20 minutes of sludge feeding, 20 minutes of sludge discharging, 50 percent of sludge discharging ratio and the rest time of anaerobic stirring, and the sludge age is 30 d; after entering a sludge storage tank (6), fermented substances are continuously pumped into an anoxic section (3-3) through a sludge pump (6-1), the sludge concentration in the continuous flow AOA reactor (3) is periodically measured in the operation process, if the sludge concentration is less than or equal to 5000mg/L, sludge is not discharged from the reactor, and simultaneously sludge fermented by a sewage plant is added into the sludge storage tank (6) to supplement sludge fermented substances; if the sludge concentration is more than 5000mg/L, the residual sludge in the sedimentation tank is utilized for fermentation, and the reflux ratio of the fermentation product is 50-100%.
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