CN116395854B - Device and method for self-induced shortcut nitrification-denitrification of waste water anaerobic digestion liquid - Google Patents
Device and method for self-induced shortcut nitrification-denitrification of waste water anaerobic digestion liquid Download PDFInfo
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- CN116395854B CN116395854B CN202310595844.4A CN202310595844A CN116395854B CN 116395854 B CN116395854 B CN 116395854B CN 202310595844 A CN202310595844 A CN 202310595844A CN 116395854 B CN116395854 B CN 116395854B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a device and a method for self-induced shortcut nitrification-denitrification of waste water anaerobic digestion liquid, wherein the method utilizes the anisotropic mass transfer process of oxygen and pollutants in a membrane aeration membrane assembly, a biological membrane with an obvious space layered structure is constructed on the surface of an aeration membrane wire, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly, and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly; based on the fact that the residual antibiotics have exposure toxicity and biological inhibition on nitrite oxidizing bacteria outside a biological membrane in the mass transfer process of pollutants in anaerobic digestion liquid in a membrane aeration membrane assembly, aerobic ammonia oxidizing bacteria are dominant in a system, nitrite oxidizing bacteria are further hindered from oxidizing nitrite nitrogen into nitrate nitrogen, and nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria, so that the self-induced short-range nitrification-denitrification process of the anaerobic digestion liquid is realized. The invention fills the blank of short-cut nitrification-denitrification research in the existing membrane aeration technology, saves energy and reduces consumption and improves the quality of the effluent at the same time.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a device and a method for self-induced shortcut nitrification-denitrification of waste water anaerobic digestion liquid.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Currently, anaerobic digestion (e.g., anaerobic lagoons, anaerobic sludge blanket, etc.) is the dominant process for the treatment of aquaculture wastewater. The anaerobic digestion can not only efficiently remove most of organic matters in the cultivation wastewater, but also convert about 70% of antibiotics and generate energy substances such as methane gas, and has the advantages of high volume load, small occupied area, low operation cost and the like. The Chinese patent application No. CN201710207513.3 discloses a cow breeding wastewater treatment process, which records that pretreated effluent enters a hydrolysis acidification tank provided with elastic filler, and then the effluent of the hydrolysis acidification tank enters an upflow anaerobic sludge blanket reactor for organic matter removal. However, the anaerobic digestion process does not allow for removal of ammonia nitrogen from the aquaculture wastewater, and the selectivity of anaerobic microbial metabolism results in about 30% -40% of undegraded antibiotics remaining in the digestive juice. Thus, there is still a need for further treatment of the anaerobic digester effluent of the aquaculture wastewater.
The carbon-nitrogen ratio of the culture wastewater after anaerobic digestion treatment is obviously reduced, and the stoichiometric requirement of microorganisms in the conventional denitrification process cannot be met, so that a more efficient denitrification process is required. Short-cut nitrification-denitrification is used as an emerging biological denitrification technology, and aerobic Ammonia Oxidizing Bacteria (AOB) are utilized to convert ammonia nitrogen in wastewater into nitrite nitrogen; meanwhile, the growth activity of Nitrite Oxidizing Bacteria (NOB) is inhibited, so that the NOB is prevented from oxidizing nitrite nitrogen into nitrate nitrogen, and the nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria. Compared with the traditional whole-process nitrification-denitrification process, the short-process nitrification-denitrification process can save 25% of aeration and 40% of organic carbon source, and the microbial reaction rate taking nitrite nitrogen as a denitrification substrate is 1.5-2 times that of taking nitrate nitrogen as the substrate, so that high-efficiency denitrification is realized.
However, the prior art discloses that the reactor for realizing short-cut nitrification-denitrification has complex configuration and harsh operation conditions (dissolved oxygen, temperature and pH), for example, chinese patent application No. CN201510976752.6 discloses a high-efficiency denitrification and decarbonization treatment process for low-C/N ratio anaerobic biogas slurry of cultivation wastewater, and the dissolved oxygen concentrations of the four-stage micro-oxygen aeration tanks are respectively as follows: 1# micro-oxygen aeration tank: 0-0.10mg/L,2# micro oxygen aeration tank: 0.20-0.35mg/L,3# micro oxygen aeration tank: 0.15-0.20mg/L,4# micro oxygen aeration tank: 0-0.15mg/L, and the reactor can meet the conditions required by biochemical reaction by creating environmental conditions suitable for the growth of microorganisms of different populations in different micro-oxygen aeration tanks. The Chinese patent of the invention with the application number of CN202111282970.1 discloses a device and a method for realizing domestic sewage denitrification by synchronous short-cut nitrification and denitrification-anaerobic ammonia oxidation coupling denitrification, and the sludge age and hydraulic retention time in a short-cut nitrification sequencing batch reactor are regulated and controlled, so that the accumulation of nitrite is ensured. However, the prior disclosed method needs to be provided with a multi-stage/multi-stage reaction unit, and realizes the short-cut nitrification-denitrification process leading by specific microorganisms through exogenous strain addition, strict control of dissolved oxygen and other parameters. Therefore, the development of the anaerobic digestion liquid treatment device and the anaerobic digestion liquid treatment method for the cultivation wastewater, which have the advantages of simple configuration, high denitrification efficiency and low energy consumption, has important significance.
Disclosure of Invention
The invention provides a device and a method for self-induced shortcut nitrification-denitrification of anaerobic digestion liquid of wastewater, which are used for solving the problem that the existing device for self-induced shortcut nitrification-denitrification of anaerobic digestion liquid of aquaculture wastewater cannot remove ammonia nitrogen in the aquaculture wastewater.
The technical scheme of the invention is realized as follows:
an apparatus for self-induced shortcut nitrification-denitrification of waste water anaerobic digestion solution, comprising:
a reaction tank;
the membrane aeration membrane component is vertically arranged inside the reaction tank;
the culture wastewater anaerobic digestion liquid conveying system is connected with the reaction tank and is suitable for conveying culture wastewater anaerobic digestion liquid into the reaction tank;
the aeration system is connected with the inlet of the membrane aeration membrane assembly and is suitable for conveying oxygen into the membrane aeration membrane assembly;
oxygen in the membrane aeration membrane assembly and pollutants in anaerobic digestion liquid of the culture wastewater carry out anisotropic mass transfer, a biological membrane with an obvious space layered structure is constructed on the surface of the membrane aeration membrane assembly, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly, and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly; the residual antibiotics have exposure toxicity and biological inhibition on nitrite oxidizing bacteria outside the biological membrane, so that the aerobic ammonia oxidizing bacteria are dominant in the system, the nitrite oxidizing bacteria are further hindered from oxidizing nitrite nitrogen into nitrate nitrogen, and the nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria, so that the self-induced short-cut nitrification-denitrification process of anaerobic digestive juice is realized.
Further optimizing technical scheme, breed waste water anaerobic digestion liquid conveying system includes:
the raw water tank is used for containing the culture wastewater to be treated;
one end of the water inlet pipe is connected with the water outlet of the raw water tank, and the other end of the water inlet pipe is connected with the reaction tank;
peristaltic pump, set up on said water inlet pipe;
the first valve is arranged on the water inlet pipe and used for controlling the on-off of the water inlet pipe.
Further optimizing technical scheme, the lateral wall bottom of membrane aeration membrane module is the air inlet, the top of membrane aeration membrane module sets up to the gas outlet and is connected with the outlet duct, is provided with the manometer on the outlet duct.
Further optimizing the technical scheme, the aeration system includes:
an air compressor;
one end of the air inlet pipe is connected with the air outlet of the air compressor, and the other end of the air inlet pipe is connected with the air inlet of the membrane aeration membrane assembly.
According to the further optimized technical scheme, the air inlet pipe is further provided with an air inlet regulating valve for regulating the oxygen amount input to the membrane aeration membrane assembly.
Further optimizing the technical scheme, be provided with the circulation system that is used for the interior breed waste water of reaction tank to carry out intensive mixing between the lateral wall bottom of reaction tank and the lateral wall top.
Further optimizing the technical scheme, still be provided with on the reaction tank at least one of following:
a mud discharging port, on which a mud discharging valve is arranged;
the water outlet pipe is provided with a water outlet valve;
the sludge sampling port is arranged on the reaction tank;
the water outlet sampling port is arranged on the reaction tank.
The method is based on a device for self-induced shortcut nitrification-denitrification of wastewater anaerobic digestion liquid, and utilizes the anisotropic mass transfer process of oxygen and pollutants in a membrane aeration membrane assembly to construct a biological membrane with an obvious space layered structure on the surface of an aeration membrane wire, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly, and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly;
based on the fact that the residual antibiotics have exposure toxicity and biological inhibition on nitrite oxidizing bacteria outside a biological membrane in the mass transfer process of pollutants in anaerobic digestion liquid in a membrane aeration membrane assembly, aerobic ammonia oxidizing bacteria are dominant in a system, nitrite oxidizing bacteria are further hindered from oxidizing nitrite nitrogen into nitrate nitrogen, and nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria, so that the self-induced short-range nitrification-denitrification process of the anaerobic digestion liquid is realized.
Further optimizing the technical scheme, when the device is used for carrying out anaerobic digestion liquid treatment on the cultivation wastewater, the device comprises the following steps:
s1, domesticating in the early stage of film hanging; mixing the selected activated sludge with an anaerobic digestion solution of artificial simulated aquaculture wastewater, and performing stuffy exposure; performing domestication culture on the activated sludge by adopting a continuous through aeration and standing method every day; judging that the activated sludge is cultured and film hanging is successful;
s2, secondary domestication; gradually increasing the ratio of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater every day until the anaerobic digestion liquid of the artificial simulated aquaculture wastewater is used as the water inlet of the membrane aeration reactor;
s3, after the secondary domestication of the microorganisms attached to the membrane aeration membrane assembly is successful, the artificial simulated wastewater anaerobic digestion liquid is changed into the actual wastewater anaerobic digestion liquid of the farm, and the membrane aeration reactor operates normally; detecting COD concentration, total nitrogen concentration and ammonia nitrogen concentration indexes of the effluent every day, and observing the growth condition of a biological film on the film wire; after the reactor runs continuously for a period of time, community analysis is carried out on microorganisms growing on the surface of the membrane wire, aerobic bacterial groups mainly comprising ammonia oxidizing bacteria are formed on the surface of the membrane wire, and meanwhile, the growth of nitrite oxidizing bacteria is inhibited.
Further optimizing the technical scheme, the step S2 comprises the following steps:
gradually increasing the ratio of anaerobic digestion liquid of artificial simulated aquaculture wastewater every day, introducing the digestion liquid, and adding antibiotics into the reaction tank in proper time and in proper amount;
performing secondary domestication culture on the activated sludge by adopting a continuous through aeration and standing method every day, and starting a circulating pump in the running process of the reactor; discharging the sludge at the bottom to domesticate the microorganisms growing in the reaction tank again;
repeatedly performing three processes of continuous aeration, standing and water changing, detecting the COD concentration, total nitrogen concentration and ammonia nitrogen concentration index of the effluent every day, and observing the growth condition of the biological film on the film wire in the period;
and judging whether the secondary domestication is successful or not.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the device and the method for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater, provided by the invention, make up for the blank of the existing membrane aeration technology in the study of shortcut nitrification-denitrification, have a simple structure, and obtain stable nitrite accumulation by optimizing the operation condition of a membrane aeration system and manually adding antibiotics to domesticate a biomembrane aiming at the characteristics of low carbon nitrogen ratio and higher antibiotic concentration of the anaerobic digestion liquid of the cultured wastewater, so that aerobic ammonia oxidizing bacteria are dominant in the system and nitrite oxidizing bacteria are completely removed or inhibited in the system to realize the optimal condition of shortcut nitrification; the method not only realizes the deep removal of antibiotics, but also can stably realize the short-cut nitrification-denitrification reaction, thereby improving the denitrification efficiency, and realizing the low-energy-consumption and high-efficiency treatment of the aquaculture wastewater.
2. The device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater provided by the invention has the advantages that the membrane aeration system can simply and long-effectively realize an aerobic-anoxic functional layer, the enrichment of aerobic ammonia oxidizing bacteria and denitrifying bacteria can be realized by different oxygen environments depending on survival, and the growth activity of nitrite oxidizing bacteria is inhibited, so that the quantity of nitrite oxidizing bacteria is reduced.
3. The device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater can realize shortcut nitrification-denitrification in a membrane aeration reactor simply and conveniently by using endogenous antibiotics of sewage aiming at different types of cultivation wastewater, economically and efficiently improve the purification efficiency of the sewage, realize the removal rate of ammonia nitrogen reaching 90-99.6%, the removal rate of total nitrogen reaching more than 94%, and the removal rate of organic carbon reaching 96-99%.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater.
Wherein: 1. 2 parts of membrane aeration membrane components, 3 parts of air compressors, 3 parts of air inlet pipes, 4 parts of air inlet regulating valves, 5 parts of air inlets, 7 parts of air outlets, 8 parts of sludge discharge ports, 9 parts of water inlet pumps, 10 parts of water inlet pipes, 11 parts of water inlets, 12, a water outlet pipe, 13, a reaction tank water outlet, 14, a circulating pump, 15, a circulating water pipe, 16, a circulating water outlet, 17, a reaction tank, 18, a raw water tank, 19 and a circulating water inlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater is shown in combination with fig. 1, and comprises: the device comprises a reaction tank 17, a membrane aeration membrane assembly 1, a culture wastewater anaerobic digestion liquid conveying system and an aeration system.
The reaction tank 17 is a device for carrying out a reaction. The reaction tank body is made of organic glass, so that the growth condition of microorganisms can be observed more intuitively and clearly.
The membrane aeration membrane assembly 1 is vertically arranged inside the reaction tank 17. The membrane aeration membrane assembly 1 consists of a plurality of hydrophobic membrane wires, and the number of the membrane aeration membrane assembly is about 1000.
The cultivation wastewater anaerobic digestion liquid conveying system is connected with the reaction tank 17 and is suitable for conveying the cultivation wastewater anaerobic digestion liquid into the reaction tank 17.
The aeration system is connected with the inlet of the membrane aeration membrane assembly 1 and is suitable for conveying oxygen into the membrane aeration membrane assembly 1.
In the device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater, the oxygen in the membrane aeration membrane assembly 1 and pollutants in the anaerobic digestion liquid of the aquaculture wastewater carry out anisotropic mass transfer, a biological membrane with an obvious space layered structure is constructed on the surface of the membrane aeration membrane assembly 1, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly 1, and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly 1; the residual antibiotics have exposure toxicity and biological inhibition on nitrite oxidizing bacteria outside the biological membrane, so that the aerobic ammonia oxidizing bacteria are dominant in the system, the nitrite oxidizing bacteria are further hindered from oxidizing nitrite nitrogen into nitrate nitrogen, and the nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria, thereby realizing the self-induced short-cut nitrification-denitrification process of anaerobic digestion liquid, saving energy and reducing consumption, and improving the quality of effluent water.
The anaerobic digestion liquid conveying system for the cultivation wastewater comprises: raw water tank 18, inlet tube 10, inlet pump 9 and first valve. The raw water tank 18 is used for containing the cultivation wastewater to be treated. One end of the water inlet pipe 10 is connected with the water outlet of the raw water tank 18, and the other end is connected with the reaction tank 17. The water inlet pump 9 is arranged on the water inlet pipe 10. The first valve is arranged on the water inlet pipe 10 and is used for controlling the on-off of the water inlet pipe 10. The water inlet pipe 10 is a silicone tube special for a Lange peristaltic pump.
The bottom of the side wall of the membrane aeration membrane assembly 1 is provided with an air inlet 5, the top end of the membrane aeration membrane assembly 1 is provided with an air outlet 7 and is connected with an air outlet pipe, and a pressure gauge is arranged on the air outlet pipe.
The aeration system includes: an air compressor 2 and an air inlet pipe 3. One end of the air inlet pipe 3 is connected with an air outlet of the air compressor 2, and the other end is connected with an air inlet of the membrane aeration membrane assembly 1. The air inlet pipe 3 and the air outlet pipe are made of polypropylene (PP), polyethylene (PE) or ABS resin materials.
A circulation system is arranged between the bottom of the side wall and the top of the side wall of the reaction tank 17, and the circulation system is used for fully mixing the culture wastewater in the reaction tank 17. The circulation system comprises a circulation water outlet 16, a circulation water pipe 15, a circulation pump 14 and a circulation water inlet 19. The circulating water outlet 16 is arranged at the bottom of the side wall of the reaction tank 17, the circulating water inlet 19 is arranged at the top of the side wall of the reaction tank 17, the circulating water pipe 15 is connected between the circulating water outlet 16 and the circulating water inlet 19, and the circulating pump 14 is arranged on the circulating water pipe 15.
The reaction tank 17 is also provided with a mud discharging port 8 and a water outlet pipe 12. The mud discharging port 8 is arranged at the bottom of the side wall of the reaction tank 17. The water outlet pipe 12 is connected with the water outlet 13 of the reaction tank, and the water outlet 13 of the reaction tank is arranged at the top of the side wall of the reaction tank 17.
Because of the need of adjusting various operation parameters of the experimental device, such as air flow speed and water flow speed, the air inlet pipe 3 is provided with an air inlet adjusting valve 4 and a pressure gauge, and all the water inlets, the water outlets and the mud outlets 8 are provided with valves, so that the experimental device can operate normally, stably and efficiently.
The reaction tank body is made of cylindrical organic glass, and the effective volume of the tank body is about 20L. The water inlet adopts sequential batch water inlet, the flow rate of the wastewater is controlled by a water inlet pump, and the wastewater enters from the lower part of the reactor and goes out from the upper part of the reactor. The air supply mode adopts through air aeration, an air compressor generates air, the air pressure is controlled by a pressure reducing valve, and then the air flows through a gas flowmeter to enter the hollow fiber membrane wires, and redundant air is discharged from the top of the reactor. The membrane aeration membrane component is fixed at the center position in the cylinder, and the top of the membrane component is 5 cm to 8cm away from the top opening of the cylinder; the membrane material adopted by the membrane aeration membrane component is an enhanced composite hydrophobic membrane material, and the main operation parameters of the membrane component are as follows: when the aeration pressure is 10kPa, the unit oxygen transmission rate is required to reach 8.0gO 2 /m 2 D is higher than or equal to 16.0gO per unit oxygen transmission rate when the aeration pressure is 45kPa 2 /m 2 D is higher than water temperature of 25 ℃, and the time required for the water body to reach oxygen saturation is less than or equal to 90min under the condition that the aeration pressure is 30 kPa.
The connection process of the device for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater comprises the following steps: the membrane aeration membrane assembly 1 is fixed in the reaction tank 17, and the raw water tank 18 is connected with the water inlet 11 of the reaction tank 17 through the water inlet pump 9 and the water inlet pipe 10; the air compressor 2 is connected with an air inlet 5 of the membrane aeration membrane assembly 1 through an air inlet pipe 3; the circulating water pipe 15 is connected with a circulating water inlet 19 and a circulating water outlet 16 of the reaction tank 17; the reaction tank 17 completes the sludge discharge work through the sludge discharge port 8.
As a further improved embodiment, sludge sampling ports are provided at a distance of 2-3cm from the bottom of the reaction tank, respectively, so as to further analyze the relevant characteristics of the microbial community.
As a further improved implementation mode, water outlet sampling ports are respectively arranged at positions 8-10cm away from the top of the reaction tank so as to further analyze various water quality indexes of the mixed solution in the reaction tank body.
Example 2
The embodiment discloses a wastewater anaerobic digestion solution self-induced shortcut nitrification-denitrification method, which is based on the wastewater anaerobic digestion solution self-induced shortcut nitrification-denitrification device in the embodiment 1, and the method utilizes the anisotropic mass transfer process of oxygen and pollutants in a membrane aeration membrane assembly 1 to construct a biological membrane with an obvious space layered structure on the surface of an aeration membrane wire, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly 1, and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly 1.
Based on the fact that the residual antibiotics have exposure toxicity and biological inhibition on nitrite oxidizing bacteria outside a biological membrane in the mass transfer process of the membrane aeration membrane assembly 1 of pollutants in anaerobic digestion liquid, aerobic ammonia oxidizing bacteria are dominant in a system, nitrite nitrogen is further prevented from being oxidized into nitrate nitrogen by nitrite oxidizing bacteria, and the nitrite nitrogen is directly converted into nitrogen under the action of denitrifying bacteria, so that the self-induced short-range nitrification-denitrification process of the anaerobic digestion liquid is realized.
The method for self-induced shortcut nitrification-denitrification of the anaerobic digestion liquid of the wastewater comprises the following steps when the anaerobic digestion liquid of the cultivation wastewater is treated:
s1, early stage film hanging domestication.
Because the water quality stability of the cultivation wastewater is poor, the artificial simulation cultivation wastewater anaerobic digestion liquid (the main water quality indexes of the artificial simulation cultivation wastewater anaerobic digestion liquid such as COD, total nitrogen and the like mainly refer to the water quality indexes of the cultivation wastewater in the same batch of a certain cultivation farm) is mainly adopted for the experiment in the prior stage, and the influence of different water quality characteristics and environmental factors on the membrane aeration reactor is mainly examined in the stage. The specific method comprises the following steps:
(1) mixing selected activated sludge (returned sludge from a secondary sedimentation tank of a sewage treatment plant, standing and precipitating to remove surface clear liquid before inoculating sludge, and then inoculating a flocculation combination body at the lower part), and performing mixed stuffy aeration on the mixed activated sludge and the anaerobic digestion liquid of the artificial simulated aquaculture wastewater, wherein the anaerobic digestion liquid of the artificial simulated aquaculture wastewater added in the process is prepared according to the same proportion of the anaerobic digestion liquid of the wastewater of the actual farm, the inoculation amount of the activated sludge accounts for 5-10% of the volume of the reaction tank, the introduction amount of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater accounts for 30% of the volume of the reaction tank, the introduction amount of tap water accounts for 60% of the volume of the reaction tank, and the total height of the simulated aquaculture wastewater is lower than 5-8cm at the top of the reaction tank. Standing for 2h after stuffiness and exposure for 48h to precipitate the activated sludge, removing 1/3 volume of supernatant wastewater, and then injecting the same volume of artificial simulated aquaculture wastewater digestive juice again.
(2) Performing domestication culture on the activated sludge by adopting a method of continuous through aeration for 22 hours and standing for 2 hours every day, gradually increasing the water changing proportion from 1/3 to 3/4 in the culture process, repeatedly performing three processes of stuffy aeration, standing and water changing, detecting indexes such as COD concentration, total nitrogen concentration, ammonia nitrogen concentration and the like of the effluent every day, and observing whether membranous threads finish the membranous process in the period; and (3) repeatedly performing the processes of stuffy aeration, standing and water changing for 2-3 weeks, and judging that the cultivation of the activated sludge is finished and the film is successfully formed if a compact yellow biological film appears on the surface of the film wire and the water quality index of water inlet and outlet every day is gradually stable.
S2, secondary domestication.
As described above, in the early-stage membrane-forming domestication step, the ratio of the anaerobic digestion solution of the artificial simulated aquaculture wastewater in the reaction tank to tap water is 1:2, gradually increasing the duty ratio of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater every day until the anaerobic digestion liquid of the artificial simulated aquaculture wastewater is used as the water inlet of the membrane aeration reactor for secondary domestication, and mainly aiming at examining the operation condition of the membrane aeration reactor under the condition of being highly similar to the actual anaerobic digestion liquid of the aquaculture wastewater. The specific method comprises the following steps:
(1) the ratio of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater is gradually increased every day, and a certain antibiotic is timely and properly added into the reaction tank while the digestion liquid is introduced, wherein the addition is approximately consistent with the common concentration in the anaerobic digestion liquid of the aquaculture wastewater.
(2) And in the same way, the secondary acclimation culture is carried out on the activated sludge by adopting a method of continuous through aeration for 22 hours and standing for 2 hours every day, and a circulating pump is also required to be started in the running process of the reactor, so that the aim of fully mixing the concentration of wastewater in the reactor is fulfilled, the rotating speed of the pump is controlled at 90r/min, the hydraulic retention time in the reaction tank is ensured to be 24 hours, and after the Hydraulic Retention Time (HRT) is 1, the sludge at the bottom is discharged so as to acclimate the microorganisms growing in the reaction tank again.
(3) And repeatedly performing three processes of continuous aeration, standing and water changing, detecting indexes such as COD concentration, total nitrogen concentration, ammonia nitrogen concentration and the like of the daily effluent, observing the growth condition of the biological film on the film wire in the period, and changing the surface of the film wire from light yellow to dark brown after the operation is circulated for 10 days, so that the secondary domestication is considered to be successful.
S3, after the secondary domestication of the microorganisms attached to the membrane wires of the membrane aeration membrane assembly 1 is successful, the artificial simulated wastewater anaerobic digestion liquid is changed into the actual wastewater anaerobic digestion liquid of a certain farm, and the membrane aeration reactor operates normally. And similarly, detecting indexes such as COD concentration, total nitrogen concentration, ammonia nitrogen concentration and the like of the daily effluent, and observing the growth condition of the biological film on the film wire. After the reactor is continuously operated for 90d, community analysis is carried out on microorganisms growing on the surface of the membrane wire, and it can be found that aerobic bacteria groups mainly comprising ammonia oxidizing bacteria are formed on the surface of the membrane wire, and meanwhile, the growth of nitrite oxidizing bacteria is inhibited to a certain extent; the invention discloses a device and a method for treating anaerobic digestion liquid of aquaculture wastewater, which have the advantages of simple configuration, high denitrification efficiency and low energy consumption.
By adopting the method, the unique advantages of the membrane aeration system are utilized, the transverse gradient distribution of oxygen and water flow direction is formed, so that an aerobic bacterial group mainly comprising ammonia oxidizing bacteria is formed, meanwhile, the growth of nitrite oxidizing bacteria is inhibited, stable nitrite accumulation is obtained, the denitrification reaction is further completed by adjusting the operation parameters of the membrane aeration system, and finally, the short-range nitrification-denitrification effect is realized in the membrane aeration system, and the total nitrogen removal efficiency is improved to be more than 94%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. The method is characterized in that the method is based on a device for self-induced shortcut nitrification and denitrification of the anaerobic digestion liquid of the wastewater, and utilizes the anisotropic mass transfer process of oxygen and pollutants in a membrane aeration membrane assembly (1), a biological membrane with an obvious space layered structure is constructed on the surface of an aeration membrane wire, aerobic ammonia oxidizing bacteria are proliferated on the inner side of the membrane aeration membrane assembly (1), and nitrite oxidizing bacteria are proliferated on the outer side of the membrane aeration membrane assembly (1);
the device for self-induced shortcut nitrification and denitrification of the anaerobic digestion liquid of the wastewater comprises:
a reaction tank (17);
the membrane aeration membrane component (1) is vertically arranged inside the reaction tank (17);
the cultivation wastewater anaerobic digestion liquid conveying system is connected with the reaction tank (17) and is suitable for conveying cultivation wastewater anaerobic digestion liquid into the reaction tank (17);
the aeration system is connected with the inlet of the membrane aeration membrane assembly (1) and is suitable for conveying oxygen into the membrane aeration membrane assembly (1);
the anaerobic digestion liquid conveying system for the cultivation wastewater comprises:
a raw water tank (18) for containing the cultivation wastewater to be treated;
one end of the water inlet pipe (10) is connected with the water outlet of the raw water tank (18), and the other end of the water inlet pipe is connected with the reaction tank (17);
a water inlet pump (9) arranged on the water inlet pipe (10);
the first valve is arranged on the water inlet pipe (10) and is used for controlling the on-off of the water inlet pipe (10);
the bottom of the side wall of the membrane aeration membrane assembly (1) is provided with an air inlet (5), the top end of the membrane aeration membrane assembly (1) is provided with an air outlet (7) and is connected with an air outlet pipe, and a pressure gauge is arranged on the air outlet pipe;
the aeration system includes:
an air compressor (2);
one end of the air inlet pipe (3) is connected with the air outlet of the air compressor (2), and the other end of the air inlet pipe is connected with the air inlet of the membrane aeration membrane assembly (1);
a circulating system for fully mixing the cultivation wastewater in the reaction tank (17) is arranged between the bottom of the side wall and the top of the side wall of the reaction tank (17);
a circulating system is arranged between the bottom of the side wall of the reaction tank (17) and the top of the side wall, the circulating system is used for fully mixing the culture wastewater in the reaction tank (17), the circulating system comprises a circulating water outlet (16), a circulating water pipe (15), a circulating pump (14) and a circulating water inlet (19), the circulating water outlet (16) is arranged at the bottom of the side wall of the reaction tank (17), the circulating water inlet (19) is arranged at the top of the side wall of the reaction tank (17), the circulating water pipe (15) is connected between the circulating water outlet (16) and the circulating water inlet (19), and the circulating pump (14) is arranged on the circulating water pipe (15); the reaction tank (17) is also provided with a mud discharging port (8) and a water outlet pipe (12), the mud discharging port (8) is arranged at the bottom of the side wall of the reaction tank (17), the water outlet pipe (12) is connected with a water outlet (13) of the reaction tank, and the water outlet (13) of the reaction tank is arranged at the top of the side wall of the reaction tank (17);
the method comprises the following steps of:
s1, domesticating in the early stage of film hanging; mixing the selected activated sludge with an anaerobic digestion solution of artificial simulated aquaculture wastewater, and performing stuffy exposure; the artificial simulated aquaculture wastewater anaerobic digestion solution added in the process is prepared in equal proportion according to the wastewater anaerobic digestion solution of an actual farm, the inoculation amount of activated sludge accounts for 5-10% of the volume of the reaction tank, the introduction amount of the artificial simulated aquaculture wastewater anaerobic digestion solution accounts for 30% of the volume of the reaction tank, the introduction amount of tap water accounts for 60% of the volume of the reaction tank, and the total height of the simulated aquaculture wastewater anaerobic digestion solution is lower than 5-8cm at the top of the reaction tank; standing for 2h after stuffy aeration is 48 and h to precipitate activated sludge, removing 1/3 volume of supernatant wastewater, and then re-injecting anaerobic digestion liquid of the same volume of artificial simulated aquaculture wastewater;
performing domestication culture on the activated sludge by adopting a method of 22h continuous through aeration and 2h standing every day, gradually increasing the water changing proportion from 1/3 to 3/4 in the culture process, repeatedly performing three processes of stuffy aeration, standing and water changing, detecting indexes of COD concentration, total nitrogen concentration and ammonia nitrogen concentration of effluent every day, and observing whether membranous threads finish the membranous attaching process in the period; after repeated processes of stuffy aeration, standing and water changing for 2-3 weeks, if a compact yellow biological film appears on the surface of the membrane silk and the water quality index of water entering and exiting every day is gradually stable, judging that the activated sludge is cultivated and the membrane is successfully formed;
s2, secondary domestication; gradually increasing the ratio of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater every day until the anaerobic digestion liquid of the artificial simulated aquaculture wastewater is used as the water inlet of the reaction tank (17);
s3, after the secondary domestication of the microorganisms attached to the membrane aeration membrane assembly (1) is successful, the artificial simulated wastewater anaerobic digestion liquid is changed into the actual wastewater anaerobic digestion liquid of the farm, and the reaction tank (17) operates normally; similarly, detecting the COD concentration, total nitrogen concentration and ammonia nitrogen concentration index of the daily effluent, and observing the growth condition of the biological film on the film wire;
wherein, step S2 includes the following steps:
gradually increasing the ratio of the anaerobic digestion liquid of the artificial simulated aquaculture wastewater every day, introducing the anaerobic digestion liquid of the wastewater, and adding antibiotics into the reaction tank in proper time and in proper amount;
performing secondary domestication culture on the activated sludge by adopting a method of 22h continuous through aeration and 2h standing every day, and starting a circulating pump in the running process of the reactor; discharging the sludge at the bottom to domesticate the microorganisms growing in the reaction tank again;
repeatedly performing three processes of continuous aeration, standing and water changing, detecting the COD concentration, total nitrogen concentration and ammonia nitrogen concentration index of the effluent every day, and observing the growth condition of the biological film on the film wire in the period; the surface of the membrane silk is changed from light yellow to dark brown, and the secondary domestication is considered successful.
2. The method for self-induced shortcut nitrification and denitrification of wastewater anaerobic digestion liquid according to claim 1, wherein the air inlet pipe (3) is further provided with an air inlet regulating valve (4) for regulating the amount of oxygen input to the membrane aeration membrane assembly (1).
3. The method for self-induced shortcut nitrification and denitrification of waste water anaerobic digestion solution according to claim 1, wherein a sludge discharge valve is arranged on the sludge discharge port (8); a water outlet valve is arranged on the water outlet pipe (12); the sludge sampling port is arranged on the reaction tank; the water outlet sampling port is arranged on the reaction tank.
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| CN116119838A (en) * | 2023-03-07 | 2023-05-16 | 南京理工大学 | Method for enhancing pyridine degradation and synchronous short-range denitrification by combining functional bacteria with MABR (mechanical anaerobic fermentation) technology |
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| CN116119838A (en) * | 2023-03-07 | 2023-05-16 | 南京理工大学 | Method for enhancing pyridine degradation and synchronous short-range denitrification by combining functional bacteria with MABR (mechanical anaerobic fermentation) technology |
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