CN112456646A - Device and method for coupling A0A-SBR of anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification enhanced partial denitrification - Google Patents
Device and method for coupling A0A-SBR of anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification enhanced partial denitrification Download PDFInfo
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Abstract
An AOA-SBR device and a method for reinforcing short-cut denitrification coupling anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification belong to the field of urban sewage treatment. The sludge enters a fermentation tank for anaerobic fermentation to produce methane, the produced methane enters a gas collecting tank, the sludge fermentation liquor enters an intermediate water tank, and then the methane and the sludge fermentation liquor are introduced into an anoxic section of the SBR reactor. Domestic sewage enters an anaerobic section of the SBR from a raw water tank, glycogen and PHA are synthesized by utilizing organic matters in the domestic sewage by using polysaccharide bacteria and phosphorus accumulating bacteria, and phosphorus is released by the phosphorus accumulating bacteria. Then the nitrification reaction and the phosphorus absorption action are carried out in the aerobic section. And finally, short-range denitrification is carried out in an anoxic section, anaerobic ammonia oxidizing bacteria utilize nitrite nitrogen generated by the short-range denitrification and ammonia nitrogen in sludge fermentation liquor to carry out anaerobic ammonia oxidizing action, and nitrate nitrogen as a byproduct is reduced into nitrite nitrogen through the short-range denitrification for the anaerobic ammonia oxidizing bacteria to utilize, so that the aims of deep denitrification and dephosphorization of sewage are fulfilled. The invention does not need additional carbon source and has the characteristics of energy saving, consumption reduction and the like.
Description
Technical Field
The invention belongs to the field of urban sewage treatment and regeneration, and particularly relates to an AOA-SBR device and method for reinforcing short-cut denitrification coupling anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification.
Technical Field
At present, the problem of water eutrophication is increasingly prominent, and the main challenge of sewage treatment plants is to effectively remove nitrogen and phosphorus from sewage with low C/N ratio and meet increasingly strict quality standards of the sewage treatment plants. The method reduces the operation cost as much as possible in the process of realizing the deep denitrification of the sewage, and is more in line with the development target of China at present, so that the development of the economic and green sewage denitrification technology has great significance for sustainable development.
Presently, anammox is widely studied as an autotrophic nitrogen removal technology. The anaerobic ammonia oxidation is an autotrophic denitrification process which takes ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor and converts the two nitrogen into nitrogen and partial nitrate nitrogen. The process can realize partial removal of nitrogen in the sewage without organic matters. Anaerobic ammonia oxidation requires a stable nitrite source, while short-cut denitrification is a process for converting nitrate nitrogen into nitrite nitrogen under anoxic conditions, and can stably provide substrate nitrite nitrogen for anaerobic ammonia oxidation. The short-cut denitrification coupling anaerobic ammonia oxidation can effectively save carbon sources and has the capability of treating the nitrate as a byproduct of the anaerobic ammonia oxidation.
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 biogas generated by sludge fermentation of the sewage treatment plant contains hydrogen sulfide with different concentrations, compared with sulfur-containing minerals and wastewater, the biogas mainly comprises methane and carbon dioxide, and is dissolved in waterThe degree is low, the method is an economic and safe mode by taking hydrogen sulfide in the methane as a denitrification electron donor, and simultaneously, methane in the methane and soluble methane in sludge fermentation liquor can also be used as denitrification electron donors, so that the synergistic effect of methane oxidation and denitrification, namely denitrification type methane anaerobic oxidation (DAMO), is realized. Can achieve the purpose of strengthening the denitrification 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, the device and the method for enhancing the short-cut denitrification coupling AOA-SBR by heterotrophic denitrification and autotrophic denitrification are provided, and residual sludge and part of exogenous sludge in the SBR reactor are subjected to anaerobic fermentation in a sludge fermentation tank to generate biogas. Then introducing the methane and the sludge fermentation liquor into an anoxic section of the SBR reactor. And (3) fully utilizing organic matters in raw water to store an internal carbon source in an anaerobic section of the SBR reactor, and releasing phosphorus. And carrying out nitration reaction in the aerobic section to convert ammonia nitrogen in the raw water into nitrate nitrogen and absorb phosphorus. And finally, short-range denitrification is carried out by taking a carbon source, methane and hydrogen sulfide as electron donors in an anoxic section, anaerobic ammonia oxidizing bacteria utilize nitrite nitrogen generated by the short-range denitrification and ammonia nitrogen in sludge fermentation liquor to carry out anaerobic ammonia oxidation, and byproduct nitrate nitrogen can be reduced into nitrite nitrogen through the short-range denitrification to be utilized by the anaerobic ammonia oxidizing bacteria, so that the aims of deep denitrification and dephosphorization of sewage are fulfilled, resources are fully and efficiently utilized, and sludge reduction is realized.
Disclosure of Invention
The invention aims to provide a device and a method for A0A-SBR (anaerobic ammonium oxidation-sequencing batch reactor) which is coupled with short-range denitrification and anaerobic ammonium oxidation by heterotrophic denitrification and autotrophic denitrification enhancement for nitrogen and phosphorus removal of low-C/N-ratio municipal sewage. In the device, SBR excess sludge and part of exogenous sludge enter a fermentation tank to be subjected to anaerobic fermentation to generate methane, the generated methane enters a gas collecting tank, sludge fermentation liquor enters an intermediate water tank, and then the methane and the sludge fermentation liquor are introduced into an anoxic section of the SBR reactor. Domestic sewage firstly enters an anaerobic section of the SBR from a raw water tank, glycogen and PHA are synthesized by utilizing organic matters in the domestic sewage by using polysaccharide bacteria and phosphorus accumulating bacteria, and phosphorus is released by the phosphorus accumulating bacteria. Then the nitrification reaction and the phosphorus absorption action are carried out in the aerobic section. And finally, short-range denitrification is carried out by taking a carbon source, methane and hydrogen sulfide as electron donors in an anoxic section, anaerobic ammonia oxidation bacteria utilize nitrite nitrogen generated by the short-range denitrification and ammonia nitrogen in sludge fermentation liquor to carry out anaerobic ammonia oxidation, and the byproduct nitrate nitrogen can be reduced into nitrite nitrogen through the short-range denitrification to be utilized by the anaerobic ammonia oxidation bacteria, so that the aims of deep denitrification and dephosphorization of sewage are fulfilled. The method does not need an additional carbon source, fully utilizes resources, and can simultaneously realize the synchronous nitrogen and phosphorus removal and sludge reduction of the low C/N municipal sewage.
A0A-SBR device and method for reinforcing short-cut denitrification coupling anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification are characterized in that: comprises a sludge fermentation tank (1), a gas collecting tank (2), an intermediate water tank (3), a sewage raw water tank (4), an SBR reactor (5), a sewage water tank (6) and a residual desulfurization biogas collecting tank (7) which are connected in sequence. The method comprises the following steps that sludge is pumped into a sludge fermentation tank through a first peristaltic pump (1.1), and a first stirrer (1.2), a first dissolved oxygen controller (1.3), a first pH controller (1.4), a heating device (1.5) and a temperature control device (1.6) are arranged in the sludge fermentation tank; the sludge fermentation tank is connected with the gas collection tank and the intermediate water tank, sludge fermentation liquor enters the intermediate water tank through a first drain valve (1.7), and methane enters the gas collection tank through a first exhaust valve (1.8); the gas collecting tank is connected with the SBR reactor through an aeration device (4.1) and a gas flowmeter (4.2), and the intermediate water tank is connected with the SBR reactor through a second peristaltic pump (4.3); the sewage raw water tank is connected with the SBR through a third peristaltic pump (4.4) which is a water inlet pump, and a second stirrer (4.5), a second dissolved oxygen controller (4.6), a second pH controller (4.7), a filling frame (4.8) and a hollow ring filler (4.9) are arranged in the SBR. The SBR reactor is connected with a sewage water tank through a second drain valve (4.10) and is connected with a residual desulfurization biogas collection tank through a second exhaust valve (4.11).
The treatment process of the urban sewage in the device is as follows: the SBR excess sludge and part of exogenous sludge enter a fermentation tank to be subjected to anaerobic fermentation to produce methane, the produced methane enters a gas collecting tank, sludge fermentation liquor enters an intermediate water tank, and then the methane and the sludge fermentation liquor are introduced into an anoxic section of the SBR reactor. Domestic sewage firstly enters an anaerobic section of the SBR from a raw water tank, glycogen and PHA are synthesized by utilizing organic matters in the domestic sewage by using polysaccharide bacteria and phosphorus accumulating bacteria, and phosphorus is released by the phosphorus accumulating bacteria. Then the nitrification reaction and the phosphorus absorption action are carried out in the aerobic section. And finally, short-range denitrification is carried out by taking a carbon source, methane and hydrogen sulfide as electron donors in an anoxic section, anaerobic ammonia oxidizing bacteria utilize nitrite nitrogen generated by the short-range denitrification and ammonia nitrogen in sludge fermentation liquor to carry out anaerobic ammonia oxidation, the byproduct nitrate nitrogen can still be reduced into nitrite nitrogen through the short-range denitrification for the anaerobic ammonia oxidizing bacteria to utilize, and the residual desulfurized biogas is collected in a biogas collection tank, so that the purposes of deep denitrification and dephosphorization of sewage are realized through the processes.
The invention relates to a device and a method for strengthening short-cut denitrification coupling anaerobic ammonia oxidation AOA-SBR by heterotrophic denitrification and autotrophic denitrification, which are characterized by comprising the following steps:
(1) starting a sludge fermentation tank: the inoculated sludge of the sludge fermentation tank is the residual sludge of the SBR reactor and the residual sludge of a secondary sedimentation tank of a part of municipal sewage treatment plant, the sludge concentration is maintained at 8000-12000mg/L, and N is filled2Discharging the air in the reactor, wherein the initial pH is 7.0, subsequently adding NaOH to adjust the pH to 7.4-7.5, controlling the temperature at 35 ℃, carrying out anaerobic stirring in the reactor, and considering that the sludge fermentation tank is successfully started when the methane yield reaches more than 300ml/g-TVS, the methane concentration in the methane reaches 70% -77% and the ammonia nitrogen concentration of the sludge fermentation liquor reaches more than 180mg/L and the ammonia nitrogen concentration is stably maintained for more than 10 days. Then, the methane is introduced into a gas collecting tank, and the sludge fermentation liquid is introduced into an intermediate water tank.
(2) Starting A0A-SBR: the whole course nitrified sludge is injected into the SBR reactor as inoculated sludge, the actual domestic sewage is injected into a sewage raw water tank by taking the actual domestic sewage as raw water, the raw water is injected into the SBR reactor through a third peristaltic pump which is a water inlet pump, the operation is carried out for 2 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 16h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 4h, the sludge concentration is maintained at 3000-4000mg/L, the aeration quantity of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation, water discharging and idling. When the carbon source accumulation in the anaerobic tail reaches more than 90 percent, the total nitrogen of effluent is less than 15mg/L, the ammonia nitrogen is less than 5mg/L, and the total nitrogen is stably maintained for more than 15 days, the start of nitrification-endogenous denitrification can be considered to be successful.
(3) Heterotrophic denitrification and autotrophic denitrification enhanced short-cut denitrification coupling anaerobic ammonia oxidation stage: after the sludge fermentation tank and the AOA-SBR are successfully started, anaerobic ammonia oxidation filler is added into the SBR reactor, and the filling ratio is 15-20%. Connecting an SBR reactor, a gas collecting tank and an intermediate water tank, introducing biogas and sludge fermentation liquor into an anaerobic section of the SBR reactor, wherein the biogas introduction amount is 60L/d, the sludge fermentation liquor introduction amount is 0.5L/d, simultaneously shortening the anaerobic section time by 2h, the raw water is actual domestic sewage, running for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000 + 4000mg/L, the aeration amount of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging. At this stage, the sludge concentration in the sludge fermentation tank is still maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out. Keeping the total nitrogen of the effluent to be less than 15mg/L and the ammonia nitrogen to be less than 5mg/L, and stably maintaining for more than 15 days, and considering that the start of the heterotrophic and autotrophic denitrification enhanced short-cut denitrification coupled anaerobic ammonia oxidation stage is successful.
(4) And (3) a later operation stage: the raw water is actual domestic sewage, and the filling ratio of the anaerobic ammonia oxidation filler is 15-20%. The operation is carried out for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000-4000mg/L, the aeration quantity of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging. At this stage, the sludge concentration in the sludge fermentation tank is maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out. In order to ensure good operation effect, the later operation monitors the total nitrogen and ammonia nitrogen of the effluent. If the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, prolonging the hydraulic retention time for 2h every 15 days, keeping the water drainage ratio unchanged at 50%, namely respectively prolonging the anaerobic section for 10min, the aerobic section for 30min and the anoxic section for 20min according to the ratio of 1:3:2 until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is less than 5mg/L, increasing the methane introducing amount by 10L/d every 15 days and increasing the sludge fermentation liquor introducing amount by 0.2L/d until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, increasing the aeration rate of the aerobic section by 0.1L/min every 15 days until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5mg/L, keeping the hydraulic retention time for 12h, the water discharge ratio of 50 percent, the methane input of 60L/d, the sludge fermentation liquor input of 0.5L/d and the aeration rate of the aerobic section of 0.6-0.7L/min unchanged.
Compared with the prior art, the device and the method for strengthening the AOA-SBR by coupling the short-cut denitrification with the anaerobic ammonia oxidation through the heterotrophic denitrification and the autotrophic denitrification have the following advantages:
(1) organic matters in the municipal sewage are stored as an internal carbon source by the glycan bacteria and the phosphorus accumulating bacteria for denitrification utilization, so that the waste of the organic matters is reduced.
(2) Heterotrophic denitrification and autotrophic denitrification enhance the coupling of short-range denitrification and anaerobic ammonia oxidation, a carbon source is not required to be added, and the hydraulic retention time can be shortened.
(3) Methane, hydrogen sulfide and sludge fermentation mixed liquid in the biogas are fully utilized, the emission of toxic gas is reduced, the waste is treated by waste, and the sludge reduction can be realized.
Drawings
FIG. 1 is a schematic structural diagram of an AOA-SBR apparatus for enhancing short-cut denitrification coupled anaerobic ammonia oxidation by heterotrophic denitrification and autotrophic denitrification.
1 is a sludge fermentation tank, 2 is a gas collecting tank, 3 is an intermediate water tank, 4 is a raw sewage water tank, 5 is an SBR reactor, 6 is a sewage water tank, 7 is a residual desulfurization methane collecting tank, 1.1 is a first peristaltic pump, 1.2 is a first stirrer, 1.3 is a first dissolved oxygen controller, 1.4 is a first pH controller, 1.5 is a heating device, 1.6 is a temperature controller, 1.7 is a first drain valve, 1.8 is a first exhaust valve, 4.1 is an aeration device, 4.2 is a gas flowmeter, 4.3 is a second peristaltic pump, 4.4 is a third peristaltic pump, 4.5 is a second stirrer, 4.6 is a second dissolved oxygen controller, 4.7 is a second pH controller, 4.8 is a filling frame, 4.9 is hollow ring filling, 4.10 is a second drain valve, and 4.11 is a second exhaust valve.
The specific implementation mode is as follows:
the invention will be further described and illustrated with reference to the accompanying drawings: A0A-SBR device and method for reinforcing short-cut denitrification coupling anaerobic ammonia oxidation through heterotrophic denitrification and autotrophic denitrification are characterized in that: comprises a sludge fermentation tank (1), a gas collecting tank (2), an intermediate water tank (3), a sewage raw water tank (4), an SBR reactor (5), a sewage water tank (6) and a residual desulfurization biogas collecting tank (7) which are connected in sequence. The method comprises the following steps that sludge is pumped into a sludge fermentation tank through a first peristaltic pump (1.1), and a first stirrer (1.2), a first dissolved oxygen controller (1.3), a first pH controller (1.4), a heating device (1.5) and a temperature controller (1.6) are arranged in the sludge fermentation tank; the sludge fermentation tank is connected with the gas collection tank and the intermediate water tank, sludge fermentation liquor enters the intermediate water tank through a first drain valve (1.7), and methane enters the gas collection tank through a first exhaust valve (1.8); the gas collecting tank is connected with the SBR reactor through an aeration device (4.1) and a gas flowmeter (4.2), and the intermediate water tank is connected with the SBR reactor through a second peristaltic pump (4.3); the sewage raw water tank is connected with the SBR through a third peristaltic pump (4.4) which is a water inlet pump, and a second stirrer (4.5), a second dissolved oxygen controller (4.6), a second pH controller (4.7), a filling frame (4.8) and a hollow ring filler (4.9) are arranged in the SBR. The SBR reactor is connected with a sewage water tank through a second drain valve (4.10) and is connected with a residual desulfurization biogas collection tank through a second exhaust valve (4.11).
The method takes the septic tank wastewater of a family area of a college in Beijing as a treatment object, and the specific water quality during the operation period is as follows: COD is 100-250mg/L, NH4 +Is 30-80mg/L, NO3 -≤2mg/L，NO2 -Less than or equal to 0.5 mg/L. Test forAs shown in figure 1, the effective volume of the heterotrophic denitrification and autotrophic denitrification enhanced nitrogen removal AOA-SBR reactor is 10L, and the effective volume of the sludge fermentation tank is 5L, which are both made of organic glass.
The specific operation is as follows:
(1) starting a sludge fermentation tank: the inoculated sludge of the sludge fermentation tank is the residual sludge of the SBR reactor and the residual sludge of a secondary sedimentation tank of a part of municipal sewage treatment plant, the sludge concentration is maintained at 8000-12000mg/L, and N is filled2Discharging the air in the reactor, wherein the initial pH is 7.0, subsequently adding NaOH to adjust the pH to 7.4-7.5, controlling the temperature at 35 ℃, carrying out anaerobic stirring in the reactor, and considering that the sludge fermentation tank is successfully started when the methane yield reaches more than 300ml/g-TVS, the methane concentration in the methane reaches 70% -77% and the ammonia nitrogen concentration of the sludge fermentation liquor reaches more than 180mg/L and the ammonia nitrogen concentration is stably maintained for more than 10 days. Then, the methane is introduced into a gas collecting tank, and the sludge fermentation liquid is introduced into an intermediate water tank.
(2) Starting A0A-SBR: the whole course nitrified sludge is injected into the SBR reactor as inoculated sludge, the actual domestic sewage is injected into a sewage raw water tank by taking the actual domestic sewage as raw water, the raw water is injected into the SBR reactor through a third peristaltic pump which is a water inlet pump, the operation is carried out for 2 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 16h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 4h, the sludge concentration is maintained at 3000-4000mg/L, the aeration quantity of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation, water discharging and idling. When the carbon source accumulation in the anaerobic tail reaches more than 90 percent, the total nitrogen of effluent is less than 15mg/L, the ammonia nitrogen is less than 5mg/L, and the total nitrogen is stably maintained for more than 15 days, the start of nitrification-endogenous denitrification can be considered to be successful.
(3) Heterotrophic denitrification and autotrophic denitrification enhanced short-cut denitrification coupling anaerobic ammonia oxidation stage: after the sludge fermentation tank and the AOA-SBR are successfully started, anaerobic ammonia oxidation filler is added into the SBR reactor, and the filling ratio is 15-20%. Connecting an SBR reactor, a gas collecting tank and an intermediate water tank, introducing biogas and sludge fermentation liquor into an anaerobic section of the SBR reactor, wherein the biogas introduction amount is 60L/d, the sludge fermentation liquor introduction amount is 0.5L/d, simultaneously shortening the anaerobic section time by 2h, the raw water is actual domestic sewage, running for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000 + 4000mg/L, the aeration amount of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging. At this stage, the sludge concentration in the sludge fermentation tank is still maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out. Keeping the total nitrogen of the effluent to be less than 15mg/L and the ammonia nitrogen to be less than 5mg/L, and stably maintaining for more than 15 days, and considering that the start of the heterotrophic and autotrophic denitrification enhanced short-cut denitrification coupled anaerobic ammonia oxidation stage is successful.
(4) And (3) a later operation stage: the raw water is actual domestic sewage, and the filling ratio of the anaerobic ammonia oxidation filler is 15-20%. The operation is carried out for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000-4000mg/L, the aeration quantity of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L. Each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging. At this stage, the sludge concentration in the sludge fermentation tank is maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out. In order to ensure good operation effect, the later operation monitors the total nitrogen and ammonia nitrogen of the effluent. If the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, prolonging the hydraulic retention time for 2h every 15 days, keeping the water drainage ratio unchanged at 50%, namely respectively prolonging the anaerobic section for 10min, the aerobic section for 30min and the anoxic section for 20min according to the ratio of 1:3:2 until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is less than 5mg/L, increasing the methane introducing amount by 10L/d every 15 days and increasing the sludge fermentation liquor introducing amount by 0.2L/d until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, increasing the aeration rate of the aerobic section by 0.1L/min every 15 days until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5mg/L, keeping the hydraulic retention time for 12h, the water discharge ratio of 50 percent, the methane input of 60L/d, the sludge fermentation liquor input of 0.5L/d and the aeration rate of the aerobic section of 0.6-0.7L/min unchanged.
The test result shows that: after the operation is stable, the COD of the effluent of the municipal sewage after passing through the AOA reactor with autotrophic denitrification-enhanced short-cut denitrification coupled with anaerobic ammonia oxidation is 45-55mg/L, and NH4 +N is less than 2mg/L, total nitrogen is less than 5mg/L, and effluent COD and NH4 +The technical indexes of-N, TN and the like stably reach the national first-class A emission standard.
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 device for enhancing the AOA-SBR of the short-range denitrification coupling anaerobic ammonia oxidation by heterotrophic denitrification and autotrophic denitrification is characterized in that: comprises a sludge fermentation tank (1), a gas collecting tank (2), an intermediate water tank (3), a sewage raw water tank (4), an SBR reactor (5), a sewage water tank (6) and a residual methane collecting tank (7) which are connected in sequence; the method comprises the following steps that sludge is pumped into a sludge fermentation tank through a first peristaltic pump (1.1), and a first stirrer (1.2), a first dissolved oxygen controller (1.3), a first pH controller (1.4), a heating device (1.5) and a temperature control device (1.6) are arranged in the sludge fermentation tank; the sludge fermentation tank is connected with the gas collection tank and the intermediate water tank, sludge fermentation liquor enters the intermediate water tank through a first drain valve (1.7), and methane enters the gas collection tank through a first exhaust valve (1.8); the gas collecting tank is connected with the SBR reactor through an aeration device (4.1) and a gas flowmeter (4.2), and the intermediate water tank is connected with the SBR reactor through a second peristaltic pump (4.3); the sewage raw water tank is connected with the SBR reactor through a third peristaltic pump (4.4), namely a water inlet pump, and a second stirrer (4.5), a second dissolved oxygen controller (4.6), a second pH controller (4.7), a filling frame (4.8) and a hollow ring filling material (4.9) are arranged in the SBR reactor; the SBR reactor is connected with a sewage water tank through a second drain valve (4.10) and is connected with a residual desulfurization biogas collection tank through a second exhaust valve (4.11).
2. Method for applying the device according to claim 1, comprising the steps of:
(1) starting a sludge fermentation tank: the inoculated sludge of the sludge fermentation tank is the residual sludge of the SBR reactor and the residual sludge of a secondary sedimentation tank of a part of municipal sewage treatment plant, the sludge concentration is maintained at 8000-12000mg/L, and N is filled2Discharging air in the reactor, wherein the initial pH is 7.0, subsequently adding NaOH to adjust the pH to 7.4-7.5, controlling the temperature at 35 ℃, carrying out anaerobic stirring in the reactor, and considering that the sludge fermentation tank is successfully started when the methane yield reaches more than 300ml/g-TVS, the methane concentration in the methane reaches 70% -77% and the ammonia nitrogen concentration of the sludge fermentation liquor reaches more than 180mg/L and is stably maintained for more than 10 days; then introducing the methane into a gas collection tank, and introducing the sludge fermentation liquor into an intermediate water tank;
(2) starting A0A-SBR: injecting full-course nitrified sludge serving as inoculated sludge into an SBR reactor, injecting actual domestic sewage serving as raw water into a sewage raw water tank, injecting the raw water into the SBR reactor through a third peristaltic pump serving as a water inlet pump, operating for 2 periods every day, maintaining the drainage ratio at 50%, and maintaining the hydraulic retention time at 16h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 4h, the sludge concentration is maintained at 3000-4000mg/L, the aeration amount of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L; each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation, water drainage and idling; when the carbon source accumulation in the anaerobic tail reaches more than 90 percent, the total nitrogen of effluent is less than 15mg/L, the ammonia nitrogen is less than 5mg/L, and the nitrification endogenous denitrification can be considered to be successfully started when the carbon source accumulation is stably maintained for more than 15 days;
(3) heterotrophic denitrification and autotrophic denitrification enhanced short-cut denitrification coupling anaerobic ammonia oxidation stage: after the sludge fermentation tank and the AOA-SBR are successfully started, adding anaerobic ammonia oxidation filler into the SBR reactor, wherein the filling ratio is 15-20%; connecting an SBR reactor, a gas collecting tank and an intermediate water tank, introducing biogas and sludge fermentation liquor into an anaerobic section of the SBR reactor, wherein the biogas introduction amount is 60L/d, the sludge fermentation liquor introduction amount is 0.5L/d, simultaneously shortening the anaerobic section time by 2h, the raw water is actual domestic sewage, running for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000 + 4000mg/L, the aeration amount of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L; each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging; at this stage, the sludge concentration of the sludge fermentation tank is still maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out; keeping the total nitrogen of the effluent to be less than 15mg/L and the ammonia nitrogen to be less than 5mg/L, and stably maintaining for more than 15 days, wherein the start of the heterotrophic and autotrophic denitrification enhanced short-cut denitrification coupled anaerobic ammonia oxidation stage is considered to be successful;
(4) and (3) a later operation stage: raw water is actual domestic sewage, and the filling ratio of the anaerobic ammonia oxidation filler is 15-20%; the operation is carried out for 3 periods every day, the drainage ratio is maintained at 50%, the hydraulic retention time is 12h, wherein the anaerobic section is 1h, the aerobic section is 3h, the anoxic section is 2h, the sludge concentration is maintained at 3000-4000mg/L, the aeration amount of the aerobic section is controlled at 0.6-0.7L/min, and the dissolved oxygen is controlled at 2-3 mg/L; each period comprises water feeding, anaerobic stirring, aeration, anoxic stirring, sedimentation and water discharging; at this stage, the sludge concentration of the sludge fermentation tank is maintained at 8000-12000mg/L, the pH is adjusted to 7.4-7.5 by adding NaOH, the temperature is controlled at 35 ℃, and anaerobic stirring is carried out;
in order to ensure good operation effect, the total nitrogen and ammonia nitrogen of the effluent are monitored in the later operation; if the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, prolonging the hydraulic retention time for 2h every 15 days, keeping the water drainage ratio unchanged at 50%, and respectively prolonging the anaerobic section for 10min, the aerobic section for 30min and the anoxic section for 20min according to the ratio of 1:3:2 each time until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is less than 5mg/L, increasing the methane introducing amount by 10L/d every 15 days and increasing the sludge fermentation liquor introducing amount by 0.2L/d until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, increasing the aeration rate of the aerobic section by 0.1L/min every 15 days until the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5 mg/L; if the total nitrogen of the effluent is less than 15mg/L and the ammonia nitrogen is less than 5mg/L, keeping the hydraulic retention time for 12h, the water discharge ratio of 50 percent, the methane input of 60L/d, the sludge fermentation liquor input of 0.5L/d and the aeration rate of the aerobic section of 0.6-0.7L/min unchanged.
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