CN111153493A - Novel high-efficiency low-energy-consumption sewage deep denitrification process and system thereof - Google Patents
Novel high-efficiency low-energy-consumption sewage deep denitrification process and system thereof Download PDFInfo
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Abstract
The invention relates to a novel process and a system for sewage deep denitrification with high efficiency and low energy consumption. The invention couples and adds a solid phase carbon source denitrification pool and an inert filler denitrification pool after the MABR process to form MABR + A1+A2A combination process; or a mixed filler denitrification pool is coupled and added after the MABR process to form the MABR + A combined process. Compared with the existing A/O process, the process has the characteristics of high treatment efficiency, small total occupied area, low total energy consumption, strong load impact resistance, no need of frequent maintenance, low operation and maintenance cost and the like when the same water amount is treated, greatly simplifies the control process and reduces the operation cost. The process can efficiently treat various biochemical wastewater through the synergistic effect of the MABR process and the denitrification reaction tank, can effectively and stably maintain the COD and TN of the discharged water to be respectively lower than 40mg/L and 10mg/L, and meets the current highest standard requirement in China.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a novel high-efficiency low-energy-consumption sewage deep denitrification process and a system thereof, in particular to a denitrification reaction tank (A) with a solid-phase carbon source coupled and added after an MABR (membrane aeration bioreactor) process1Pool) and inert filler denitrification pool (A)2Pool), make up MABR + a1+A2A combination process; or a mixed filler denitrification pool is coupled and added after the MABR process to form the MABR + A combined process.
Background
In the mainstream process of the existing urban sewage treatment plant in China, the AAO sewage treatment process is the most common means, mainly comprises an anaerobic zone, an anoxic zone and an aerobic zone, and has the effect of synchronous nitrogen and phosphorus removal. A typical AAO process flow (fig. 1) is as follows: the sewage and the return sludge enter an anaerobic tank (DO)<0.2mg/L) and mixed, and after anaerobic decomposition for a certain time (1-2 h), part of carbon-containing organic matters are removed, so that part of nitrogen-containing compounds are converted into N2(denitrification), phosphorus-accumulating microorganisms in the returned sludgePhosphorus accumulating bacteriaEtc.) release phosphorus to meet the requirement of bacteria on phosphorus; then the sewage is mixed with the reflux nitrifying liquid in the aerobic tank in an anoxic tank (DO is less than or equal to 0.5mg/L), and denitrifying bacteria in the tank utilize carbon-containing organic matters in the sewage to remove NO3Reduction of-N (nitro-nitrogen) to N2(ii) a Then, the sewage flows into an aerobic tank (DO is 2-4 mg/L), and NH in the water3The N (ammonia nitrogen) is subjected to nitration reaction under the action of nitrobacteria to generate NO3And N, part of the nitrified liquid flows back to the anoxic tank for denitrification, in the process, organic matters are oxidized and decomposed to supply energy to phosphorus-absorbing microorganisms, the microorganisms absorb phosphorus from water, the phosphorus enters cell tissues and is enriched in the microorganisms, and the phosphorus-rich sludge is separated by the sedimentation tank and then is discharged from the system in the form of phosphorus-rich sludge.
The process has the functions of simultaneously removing nitrogen, phosphorus and organic matters by organically matching three different environmental conditions of anaerobic condition, anoxic condition and aerobic condition with microbial flora species. In various processes for simultaneously removing nitrogen, phosphorus and organic matters, the process flow is simplest, and the total hydraulic retention time is shorter than that of other similar processes.
Under the condition of a certain internal circulation amount, the denitrification effect of the AAO process is difficult to further improve, the total nitrogen of the general effluent can only reach the national standard first-grade B or first-grade A level, and the increasingly strict total nitrogen emission requirement is difficult to meet; meanwhile, the AAO process often faces the condition of insufficient carbon source, the denitrification effect can be maintained only by frequently supplementing the carbon source, and the operation and maintenance cost is high. Therefore, necessary technical modification must be made to achieve the improvement of the total nitrogen removal effect without increasing the maintenance cost.
A sewage treatment method based on multi-stage A/O and MABR (Chinese patent: 201910007442.1) provides a novel process for combining multi-stage A/O and MABR, which mainly comprises the following steps: the sewage flows through the anaerobic zone, the primary anoxic zone, the primary aerobic zone, the secondary anoxic zone, the MABR zone and the secondary aerobic zone in sequence, returns with sludge and nitrifying liquid, and finally enters the settling zone. The invention only simply connects the A/O process and the MABR process in series, and does not exert the maximum advantages of the MABR process, namely the characteristics of high efficiency, energy saving, synchronous nitrification and denitrification and the like.
Based on the above, the invention provides a novel sewage deep denitrification process with high efficiency and low energy consumption and a system thereof, and the advantages of the MABR process and the solid-phase carbon source are fully exerted. The novel process has the characteristics of high efficiency, energy conservation, small total occupied area, strong load impact resistance, no need of frequent maintenance and the like, greatly simplifies the control process and reduces the operation cost.
Disclosure of Invention
The invention aims to overcome the defects of low efficiency, high energy consumption, insufficient carbon source and the like of the existing AAO process, and a solid-phase carbon source denitrification reaction tank (A) is added after the MABR process in a coupling way1) And inert filler denitrification tank (A)2) To form a novel MABR + A1+A2And (4) a combination process.
The MABR process disclosed by the invention can greatly improve the utilization rate of oxygen by adopting a bubble-free aeration mode; oxygen and pollutants enter the biomembrane from two sides to carry out nitration reaction, so that the MABR forms a layered biomembrane structure, and synchronous nitration and denitrification can be realized; the solid-phase carbon source denitrification reaction tank provides a large amount of denitrification bacterial membranes and sufficient carbon sources for efficient denitrification reaction, and the inert filler denitrification tank fully utilizes residual COD for deep denitrification.
The MABR technology and the two high-efficiency denitrification tanks have synergistic effect, so that the total nitrogen in the sewage can be deeply removed with high efficiency and low energy consumption, COD generated by degradation of a solid-phase carbon source is fully utilized, and the total nitrogen removal cost is reduced. The process can effectively and stably maintain the COD and TN of the discharged water to be respectively lower than 40mg/L and 10mg/L, and meets the current highest discharge standard in China.
The process system mainly comprises an MABR tank, an adjusting tank, a solid-phase carbon source denitrification reaction tank, an inert filler denitrification reaction tank and a sedimentation tank, wherein the adjusting tank is used as a buffer area of the water outlet of the MABR tank and is used for adjusting the flow rate of the solid-phase carbon source denitrification reaction tank. The water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the solid-phase carbon source denitrification reaction tank through a pump, the water outlet of the solid-phase carbon source denitrification reaction tank is connected with the water inlet of the inert filler denitrification reaction tank, the water outlet of the inert filler denitrification reaction tank is connected with the sedimentation tank, the sludge outlets of the solid-phase carbon source denitrification reaction tank and the inert filler denitrification reaction tank are respectively connected to the sedimentation tank through pumps, and finally the sludge is discharged from the sedimentation tank in a sludge form according to the process requirements.
The solid-phase carbon source materials in the solid-phase carbon source denitrification reaction tank comprise various biological or chemical synthetic polymers (such as polyhydroxyalkanoate PHA, polybutylene succinate PBS, polylactic acid PLA and the like) which are insoluble in water and can be completely degraded by microorganisms in sewage, various natural high molecular materials (such as various plant straws, pure cellulose, modified starch and the like) and blends of the materials. The application forms of the composite material comprise various three-dimensional shapes, such as granules, rods, filaments or other shapes with various three-dimensional structures.
Preferably, the solid-phase carbon source material is Polyhydroxyalkanoate (PHA), and has the following structural general formula:
in the formula: r1Is H or methyl CH3Or ethyl radical C2H5Or propyl group C3H7；R2Is H or methyl CH3Or ethyl radical C2H5Or propyl group C3H7(ii) a m1 is 1 or 2; m2 is 1 or 2; x is 0 or any natural number from 200 to 25000, y is 0 or any natural number from 200 to 25000, and x and y are not 0 at the same time.
Novel MABR + A1+A2The specific flow of the combined process is as follows:
step one, sewage enters an MABR tank, a nitrifying bacteria film attached to a membrane component utilizes molecular oxygen to remove NH in the sewage3Conversion of-N (Ammonia Nitrogen) to NO3N (nitrate nitrogen), and meanwhile, the denitrifying bacteria membrane attached to the membrane component utilizes the inherent COD in the sewage to remove part of NO3Reduction of-N to N2Directly released into the atmosphere, and then the sewage flows into a regulating tank to be used as a buffer area of a subsequent process;
step two, the sewage treated in the step one flows into a solid-phase carbon source denitrification reaction tank from an adjusting tank, a denitrification bacterial membrane attached to the surface of the solid-phase carbon source degrades the solid-phase carbon source into small molecular organic matters, and most NO in the sewage is degraded by the small molecular organic matters3Reduction of-N to N2Releasing the sludge to the atmosphere, precipitating and separating the phosphorus-rich sludge at the bottom of the reaction tank, and conveying the sludge to a precipitation tank by using a pump;
step three, the sewage treated in the step two flows into an inert filler denitrification reaction tank, and a denitrification bacterial film attached to the inert filler further uses the residual COD of the previous stage to remove the residual NO in the sewage3Reduction of-N to N2And the effect of deep denitrification is realized, the phosphorus-rich sludge is precipitated and separated at the bottom of the reaction tank, is conveyed to the sedimentation tank by a pump, and is finally discharged from the sedimentation tank in the form of sludge according to the process requirements.
The high-efficiency synchronous nitrification and denitrification principle of the MABR + AA process is as follows: MABThe oxygen is supplied to the reactor by adopting a bubble-free aeration mode, so that the oxygen utilization efficiency is extremely high; oxygen and pollutants in water are respectively diffused from two sides of the MABR membrane, the oxygen concentration on the outer surface of the membrane material is very high, nitrifying bacteria are enriched and grown in the area, and NO generated by nitration reaction3-N and NO2N diffuses out of the nitrifying bacteria membrane, and the oxygen concentration also decreases in a gradient manner; the outer layer of the nitrifying bacteria membrane is in an environment with low oxygen concentration and high organic pollutant concentration, which is beneficial to the enrichment of denitrifying bacteria and the proceeding of denitrification reaction, and part of NO is removed3-N、NO2Reduction of-N to N2. The effluent of the MABR tank is characterized by low NH3-N, low dissolved oxygen, low COD, high NO3And N, oxygen removal operation is not required to be performed at the front end of the AA process, and the treatment advantages of a solid-phase carbon source, high-efficiency denitrification and deep denitrification are exerted to the maximum extent.
The invention also aims to overcome the defects of low efficiency, high energy consumption, insufficient carbon source and the like of the existing AAO process, a mixed filler denitrification reaction tank is added after the MABR process in a coupling mode, and a biodegradable solid-phase carbon source and an inert filler are filled in the mixed filler denitrification reaction tank in a mixing mode to form a novel MABR + A combined process.
The MABR process disclosed by the invention can greatly improve the utilization rate of oxygen by adopting a bubble-free aeration mode; oxygen and pollutants enter the biomembrane from two sides to carry out nitration reaction, so that the MABR forms a layered biomembrane structure, and synchronous nitration and denitrification can be realized; the solid-phase carbon source in the mixed filler provides a large amount of biological films and sufficient carbon source for efficient denitrification reaction, and the inert filler increases the specific surface area of a biological film carrier to be fully contacted with pollutants, so that deep denitrification is realized.
The MABR technology and the mixed filler denitrification tank have synergistic effect, can realize high-efficiency and low-energy-consumption deep removal of total nitrogen in sewage, fully utilize COD generated by degradation of a solid-phase carbon source, and reduce the total nitrogen removal cost. The process can effectively and stably maintain the COD and TN of the discharged water to be respectively lower than 40mg/L and 10mg/L, and meets the current highest standard requirement in China.
The process system mainly comprises an MABR tank, an adjusting tank, a mixed filler denitrification reaction tank and a sedimentation tank. The adjusting tank is used as a buffer area of the effluent of the MABR tank and is used for adjusting the flow rate of the denitrification reaction tank with the mixed filler. The water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the mixed filler denitrification reaction tank through a pump, the water outlet of the mixed filler denitrification reaction tank is connected with the sedimentation tank, the sludge outlet of the mixed filler denitrification reaction tank is connected to the sedimentation tank through a pump, and finally the sludge is discharged from the sedimentation tank in a sludge form according to the process requirements.
The mixed filler denitrification reaction tank adopts a mixture of a solid-phase carbon source material and an inert filler; the solid-phase carbon source material comprises various biological or chemical synthetic polymers (such as polyhydroxyalkanoate PHA, polybutylene succinate PBS, polylactic acid PLA and the like) which are insoluble in water and can be completely degraded by microorganisms in sewage, various natural high molecular materials (such as various straws, pure cellulose, modified starch and the like) and blends of the materials. The application forms of the composite material comprise various three-dimensional shapes, such as granules, rods, filaments or other shapes with various three-dimensional structures.
Preferably, the solid-phase carbon source material is Polyhydroxyalkanoate (PHA).
The specific flow of the novel MABR + A combined process is as follows:
step one, sewage enters an MABR tank, a nitrifying bacteria film attached to a membrane component utilizes molecular oxygen to remove NH in the sewage3Conversion of-N to NO3N, meanwhile, denitrifying bacteria membrane attached to the membrane component utilizes the inherent COD in the sewage to remove part of NO3Reduction of-N to N2Directly releasing the sewage into the atmosphere, and then enabling the sewage to flow into a regulating tank to serve as a buffer area of a subsequent process;
step two, the sewage treated in the step one flows into a denitrification reaction tank with mixed filler from a regulating tank, and the denitrification bacterial membrane on the surface of the mixed filler cooperates to realize the purposes of deep denitrification and digestion of residual COD; and (3) precipitating and separating the phosphorus-rich sludge at the bottom of the reaction tank, conveying the phosphorus-rich sludge to the precipitation tank by using a pump, and finally discharging the phosphorus-rich sludge from the precipitation tank in the form of sludge according to the process requirements.
The principle of high-efficiency synchronous nitrification and denitrification of the MABR + A process is as follows: MABR adopts a bubble-free aeration mode to supply oxygen for a reactorThe oxygen utilization efficiency is extremely high; oxygen and pollutants in water are respectively diffused from two sides of the MABR membrane, the oxygen concentration on the outer surface of the membrane material is very high, nitrifying bacteria grow in the area in an enrichment way, and NO generated by nitration reaction3-N and NO2N diffuses out of the nitrifying bacterial membrane, and the oxygen concentration also decreases in a gradient manner; the outer layer of the nitrifying bacteria membrane is in an environment with low oxygen concentration and high organic pollutant concentration, which is beneficial to the enrichment of denitrifying bacteria and the proceeding of denitrification reaction, and part of NO is removed3-N、NO2Reduction of-N to N2. The effluent of the MABR tank is characterized by low NH3-N, low dissolved oxygen, low COD, high NO3And N, oxygen removal operation is not required to be performed at the front end of the mixed filler denitrification reaction tank, and the treatment advantages of a solid-phase carbon source, high-efficiency denitrification and deep denitrification are exerted to the maximum extent.
And conventional A2Compared with the O process, the MABR process and the denitrification tank realize efficient deep denitrification under the synergistic effect, the steps of returning the nitrifying liquid and the sludge are saved, and the operation cost is reduced; the nitrifying bacteria membrane is arranged in the inner layer of the biological membrane, is small in water flow impact force and not easy to fall off, and ensures a stable and efficient nitrifying effect; meanwhile, the synchronous denitrification reduces the load of the subsequent denitrification tank and increases the shock resistance of the whole system.
The principle of the solid-phase carbon source denitrification reaction is as follows: the solid-phase carbon source not only provides an attachment carrier for the denitrifying bacteria, but also provides a carbon source for the denitrifying bacteria.
The denitrifying bacteria are attached to the surface of the solid-phase carbon source, and the secreted enzyme can degrade the solid-phase carbon source into the carbon source which can be utilized by the denitrifying bacteria, so that each unit consisting of the solid-phase carbon source wrapped by the denitrifying biomembrane can independently perform denitrification reaction, the activity of the biomembrane is gradually weakened from inside to outside, and the denitrifying bacteria with high internal metabolic activity are prevented from being impacted by the change of conditions such as DO, pH, temperature and the like of a water body outside the membrane due to the compactness of the biomembrane, so that the considerable denitrifying efficiency can be maintained. In contrast, the biofilm formed on the surface of the existing inert carrier obtains a carbon source from a water body, so that an area with high metabolic activity is outside the biofilm, and microorganisms inside the biofilm cannot effectively obtain the carbon source due to the obstruction of the biofilm, so that the stability of the biofilm is poor, and the biofilm is very sensitive to the change of environmental conditions. The biomembrane on the surface of the biodegradable material gradually attenuates the DO concentration from the water body to the high-activity area of the denitrifying bacteria group due to the action of the membrane, so that the requirement of the denitrifying bacteria can be met, under the environmental condition, the synchronous nitrification-denitrification and the short-range denitrification are easily realized, and a large amount of energy and carbon sources are saved.
The inert filler in the inert filler denitrification reaction tank or the mixed filler denitrification reaction tank is used for increasing the specific surface area of the carrier, and through the further action of microorganisms attached to the inert filler, the unused COD of the solid-phase carbon source can be fully utilized and the TN index of the discharged water can be further reduced.
The invention has the beneficial effects that:
the invention has the advantages of small occupied area of the process flow, simple process flow, no need of return of nitrifying liquid and sludge, reduced operation cost and suitability for upgrading and reconstruction projects and wastewater treatment projects with limited treatment site area.
The process can effectively and stably maintain the COD and TN of the discharged water to be respectively lower than 40mg/L and 10mg/L, and meets the requirement of the current highest standard in China.
Compared with the existing A/O process, the process has the characteristics of high treatment efficiency, small total occupied area, low total energy consumption, strong load impact resistance, no need of frequent maintenance, low operation and maintenance cost and the like when the same water amount is treated, greatly simplifies the control process and reduces the operation cost.
Drawings
Fig. 1 is a typical AAO process flow diagram.
FIG. 2(a) (b) shows the mechanism of the use of inert filler and solid carbon source in denitrification reaction.
FIG. 3 is a flow chart of a conventional MABR embedded AAO (MABR/AAO) process.
FIG. 4 is a flow chart of the MABR + A1+ A2 combination process of the present invention.
FIG. 5 is a flow chart of the MABR + A combination process of the present invention.
Detailed Description
The technical solutions and effects of the present invention are further described below with reference to the examples, but the present invention is not limited to the processes and material combination methods shown in the examples, and any changes that can be easily imagined by a person of ordinary skill based on the shown examples belong to the protection scope of the present invention.
The invention discloses a novel MABR + A1+A2The flow chart of the combined process is shown in figure 4, and mainly comprises an MABR tank, an adjusting tank and a solid-phase carbon source denitrification reaction tank A1Inert filler denitrification reaction tank A2And a sedimentation tank. The water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the solid-phase carbon source denitrification reaction tank through a pump, the water outlet of the solid-phase carbon source denitrification reaction tank is connected with the water inlet of the inert filler denitrification reaction tank, the water outlet of the inert filler denitrification reaction tank is connected with the sedimentation tank, the sludge outlets of the solid-phase carbon source denitrification reaction tank and the inert filler denitrification reaction tank are respectively connected to the sedimentation tank through pumps, the effluent of the sedimentation tank is directly discharged to the environment, and the sludge is discharged out of the system according to the process requirements.
The flow chart of the novel MABR + A combined process is shown in FIG. 5, and mainly comprises an MABR tank, an adjusting tank, a mixed filler denitrification reaction tank A and a sedimentation tank. The water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the mixed filler denitrification reaction tank through a pump, the water outlet of the mixed filler denitrification reaction tank is connected with the sedimentation tank, the sludge outlet of the mixed filler denitrification reaction tank is connected to the sedimentation tank through a pump, the effluent of the sedimentation tank is directly discharged to the environment, and the sludge is discharged out of the system according to the process requirements.
FIG. 2(a) (b) shows the mechanism of the use of inert filler and solid carbon source in denitrification reaction.
The soft filler, semi-soft filler, elastic filler, fiber elastic filler and spherical combined filler used in the following examples were all purchased from original environmental protection equipment ltd.
Comparative example: MABR/AAO process
An MABR/AAO treatment system with the treatment capacity of 50L/day is established according to a process flow chart shown in FIG. 3, and the system has the following parameters:
the MABR membrane module is embedded into an anoxic tank of the AAO process, compressed air is used as an oxygen supply source of the MABR, and nitrogen is used as scrubbing gas of the MABR; the dissolved oxygen of the AAO process anaerobic pool, the anoxic pool and the aerobic pool is respectively controlled as follows: the anaerobic pool is less than 0.2mg/L, the anoxic pool is less than 0.5mg/L, and the aerobic pool is 2-2.5 mg/L, the hydraulic retention time is 2h for the anaerobic pool, 4h for the anoxic pool, and 10h for the aerobic pool, and sodium acetate is selected as a supplementary carbon source for the anoxic pool. The reflux ratio of the nitrifying liquid is 2: 1, the sludge reflux ratio is 1: 1.
And (2) taking sludge from a sewage treatment plant and respectively carrying out circulating biofilm formation on the MABR/AAO according to a conventional inoculation method, wherein the sludge inoculation amount is about 5%, and the temperature is controlled at 22-25 ℃. The COD concentration of the municipal sewage to be treated is 300-500 mg/L, TN, and the concentration is 40-60 mg/L. Detecting COD and TN indexes of the effluent of the process terminal, continuously detecting for 10 days after the treatment result is basically stable, and summarizing the data as follows:
TABLE 1 MABR/AAO treatment Effect
Example 1: MABR + A1+A2Combined process
Establishing MABR + A with a throughput of 50L/day according to the process flow diagram shown in FIG. 41+A2The processing system comprises the following parameters:
a bubble-free aeration membrane component is arranged in the MABR tank, compressed air is used as an oxygen supply source, and nitrogen is used as scrubbing gas; the height of the solid carbon source fillers is unified to be 25cm, and the height of the inert fillers is unified to be 40 cm; MABR tank and solid-phase carbon source denitrification reaction tank A1Inert filler denitrification reaction tank A2Respectively 10 hours, 15 minutes and 60 minutes; denitrification reaction tank A1And A2Controlling the dissolved oxygen at 0.2-0.4 mg/L; the whole process has no nitrification liquid reflux and no sludge reflux.
Taking sludge from a sewage treatment plant and respectively inoculating the sludge into an MABR tank and a denitrification reaction tank A according to a conventional inoculation method1And A2And (3) performing circulating film formation, wherein the sludge inoculation amount is about 5%, and the temperature is controlled to be 22-25 ℃. After the biofilm formation is finished, the municipal sewage with low COD is used for gradually replacing the biofilm formationThe COD concentration of the municipal sewage to be treated is 300-500 mg/L, TN and the concentration is 40-60 mg/L. And detecting COD (chemical oxygen demand) and TN (total nitrogen) indexes of the effluent of the process terminal, continuously detecting for 5 days after the treatment result is basically stable, and taking the average value of the indexes as the final treatment result.
The experiments of examples 1-1 to 1-11 were designed in accordance with the above parameters, and the denitrification reaction tank A of each example1The filled solid phase carbon sources are different, and the denitrification reaction tank A2Different inert fillers were also charged, as follows:
example 1-1:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Filling cylindrical granules of poly-3-hydroxybutyrate-valerate (PHBV) with a molecular weight of 36 ten thousand, produced by Ningbo Tianan biomaterial Ltd, having an average length of 4.0 mm and an average diameter of 2.5 mm; denitrification reaction tank A2Filling the purchased soft filler. And (3) performing biofilm formation and water inflow according to the operation conditions described in the example 1 to form a compact bacterial membrane, so as to obtain stable COD and TN treatment effects.
Examples 1 to 2:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1The specific processing method of the composite granules filled with PHBV and PBS comprises the following steps: weighing 0.5 kg of PHBV and 4.5 kg of PBS, uniformly mixing in a high-speed stirrer, adding a feed hopper of a conical double-screw granulator, setting the temperature of five regions of the conical double-screw granulator to be 90 ℃, 120 ℃, 150 ℃, 175 ℃ and 165 ℃, and preparing dry granules by adopting an annular granulator and an air cooler; denitrification reaction tank A2The purchased fiber elastic filler is filled.
Examples 1 to 3:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Filling PBS granules produced by Lanshantunghe; denitrification reaction tank A2The purchased fiber elastic filler is filled.
Examples 1 to 4:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Filling cylindrical pellets of polylactic acid (PLA, model 2002D) manufactured by NATUREWORKS, usa, having an average length of 3.1 mm and an average diameter of 1.9 mm; denitrification reaction tank A2The purchased semi-soft filler is filled.
Examples 1 to 5:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1The method for filling the composite granules of the poly-3-hydroxybutyrate (P-3HB) and the pure cellulose comprises the following specific processing methods: weighing 0.5 kg of poly-3-hydroxybutyrate (P-3HB) and 4.5 kg of pure cellulose, uniformly mixing in a high-speed stirrer, adding a feed hopper of a conical double-screw granulator, setting the temperature of five regions of the conical double-screw granulator to be 90 ℃, 120 ℃, 150 ℃, 175 ℃ and 165 ℃, and preparing dry granules by adopting an annular granulator and an air cooler; denitrification reaction tank A2The purchased semi-soft filler is filled.
Examples 1 to 6:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Filling pure lignocellulose powder produced by Shandong Ribo cellulose Co., Ltd, wherein the diameter of the powder is 0.3-0.5 mm; denitrification reaction tank A2The purchased elastic filler is filled.
Examples 1 to 7:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Filling crushed corn straws with the grain diameter of about 20-30 meshes; denitrification reaction tank A2And filling the purchased spherical combined filler.
Examples 1 to 8:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1Loading modified starch granules produced by Wuhan Huali company with a particle size of about20-30 meshes; denitrification reaction tank A2The purchased fiber elastic filler is filled.
Examples 1 to 9:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1The composite granular material filled with poly-3-hydroxybutyrate-hexanoate copolyester (PHBH) and dry corncobs has the following specific processing method: weighing 1.5 kg of PHBH and 3.5 kg of dry corncobs, uniformly mixing in a high-speed stirrer, adding a feed hopper of a conical double-screw granulator, setting the temperature of five regions of the conical double-screw granulator to be 90 ℃, 110 ℃, 145 ℃, 155 ℃ and 140 ℃, and preparing dry granules by adopting an annular granulator and an air cooler; denitrification reaction tank A2The commercially available fibrous elastic filler was filled.
Examples 1 to 10:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1The specific processing method of the composite granules filled with PBS and modified starch comprises the following steps: weighing 2 kg of PBS and 3 kg of modified starch granules, uniformly mixing in a high-speed stirrer, adding into a feed hopper of a conical double-screw granulator, setting the temperature of five zones of the conical double-screw granulator to be 90 ℃, 110 ℃, 140 ℃, 155 ℃ and 135 ℃, and preparing into dry granules by adopting an annular granulator and an air cooler; denitrification reaction tank A2And filling the purchased spherical combined filler.
Examples 1 to 11:
the MABR tank is provided with a Zeelung foamless aeration membrane component provided by Suez Water services technology (Shanghai) Co., Ltd; denitrification reaction tank A1The specific processing method of the composite granules filled with PLA and corn straws is as follows: uniformly mixing 2 kg of PLA and 3 kg of corn straw in a high-speed stirrer, adding into a feed hopper of a conical double-screw granulator, setting the temperature of five zones of the conical double-screw granulator to be 90 ℃, 110 ℃, 130 ℃ and 150 ℃, and preparing into dry granules by adopting an annular granulator and an air cooler; denitrification reaction tank A2And filling the purchased spherical combined filler.
The filler loading variation and overall treatment effect of examples 1-1 to 1-11 are shown in Table 2:
TABLE 2 Overall treatment Effect of different solid-phase carbon sources and inert fillers in examples 1-1 to 1-11
Example 2: MABR + A combined process
A50L/day MABR + A treatment system was set up according to the process flow diagram shown in FIG. 5, except that the solid-phase carbon source denitrification reaction tank (A) after the MABR tank shown in example 1 was used1) And inert filler denitrification tank (A)2) Except for a mixed filler denitrification reaction tank A, the parameters of the system and the municipal sewage to be treated in the example 2 are the same as those in the example 1.
The filler loading variation and overall treatment effect of examples 2-1 to 2-11 are shown in Table 3:
TABLE 3 Overall treatment Effect of different solid-phase carbon sources and inert fillers in examples 2-1 to 2-11
Claims (10)
1. An efficient and low-energy-consumption deep denitrification process for sewage, MABR + A1+A2The combined process is characterized in that the MABR is coupled with two-stage anaerobic tanks which are sequentially a solid-phase carbon source denitrification reaction tank (A)1) And an inert filler denitrification reaction tank (A)2) (ii) a Wherein the filler in the solid-phase carbon source denitrification reaction tank is a biodegradable solid-phase slow-release carbon source.
2. The deep denitrification process for sewage with high efficiency and low energy consumption as claimed in claim 1, characterized by comprising the following steps:
step one, sewage enters an MABR tank, a nitrifying bacteria film attached to a membrane component utilizes molecular oxygen to remove NH in the sewage3Conversion of-N (Ammonia Nitrogen) to NO3-N (nitronium nitrogen), and at the same time, a denitrifying bacterial membrane attached to the membrane modulePart of NO is removed by utilizing the inherent COD in the sewage3Reduction of-N to N2Directly releasing the sewage into the atmosphere, and then enabling the sewage to flow into a regulating tank to be used as a buffer area of a subsequent process;
step two, the sewage treated in the step one flows into a solid phase carbon source denitrification reaction tank (A) from a regulating tank1) The denitrifying bacteria film attached to the surface of the solid-phase carbon source degrades the solid-phase carbon source into small molecular organic matters and utilizes the small molecular organic matters to degrade most NO in the sewage3Reduction of-N to N2Releasing the sludge to the atmosphere, precipitating and separating the phosphorus-rich sludge at the bottom of the reaction tank, and conveying the sludge to a precipitation tank by using a pump;
step three, the sewage treated in the step two flows into an inert filler denitrification reaction tank (A)2) The denitrifying bacteria film attached to the inert filler further uses the residual COD of the previous stage to remove the residual NO in the sewage3Reduction of-N to N2The phosphorus-rich sludge is precipitated and separated at the bottom of the reaction tank, conveyed to the sedimentation tank by a pump and finally discharged from the sedimentation tank in the form of sludge according to the process requirements.
3. A sewage deep denitrification device with high efficiency and low energy consumption is characterized by comprising an MABR tank, an adjusting tank, a solid-phase carbon source denitrification reaction tank, an inert filler denitrification reaction tank and a sedimentation tank; the water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the solid-phase carbon source denitrification reaction tank through a pump, the water outlet of the solid-phase carbon source denitrification reaction tank is connected with the water inlet of the inert filler denitrification reaction tank, the water outlet of the inert filler denitrification reaction tank is connected with the sedimentation tank, and the sludge outlets of the solid-phase carbon source denitrification reaction tank and the inert filler denitrification reaction tank are respectively connected to the sedimentation tank through pumps and are finally discharged from the sedimentation tank in the form of sludge according to the process requirements; wherein the filler in the solid-phase carbon source denitrification reaction tank is a biodegradable solid-phase slow-release carbon source.
4. An efficient and low-energy-consumption sewage deep denitrification process is an MABR + A combined process and is characterized in that an MABR is coupled with a primary anaerobic tank, the primary anaerobic tank is a mixed filler denitrification reaction tank, and mixed fillers are filled in the primary anaerobic tank; wherein the mixed filler is a mixture of a biodegradable solid-phase slow-release carbon source and an inert filler.
5. The deep denitrification process for sewage with high efficiency and low energy consumption as claimed in claim 4, characterized by comprising the following steps:
step one, sewage enters an MABR tank, a nitrifying bacteria film attached to a membrane component utilizes molecular oxygen to remove NH in the sewage3Conversion of-N to NO3N, meanwhile, denitrifying bacteria membrane attached to the membrane component utilizes the inherent COD in the sewage to remove part of NO3Reduction of-N to N2Directly releasing the sewage into the atmosphere, and then enabling the sewage to flow into a regulating tank to be used as a buffer area of a subsequent process;
step two, the sewage treated in the step one flows into a denitrification reaction tank with mixed filler from a regulating tank, and the denitrification bacteria film on the surface of the mixed filler cooperates to realize the purposes of deep denitrification and digestion of residual COD; and (3) precipitating and separating the phosphorus-rich sludge at the bottom of the reaction tank, conveying the phosphorus-rich sludge to the precipitation tank by using a pump, and finally discharging the phosphorus-rich sludge from the precipitation tank in the form of sludge according to the process requirements.
6. A sewage deep denitrification device with high efficiency and low energy consumption is characterized by comprising an MABR tank, an adjusting tank, a mixed filler denitrification reaction tank and a sedimentation tank; the water outlet of the MABR tank is connected with the water inlet of the regulating tank, the water outlet of the regulating tank is connected with the water inlet of the mixed filler denitrification reaction tank through a pump, the water outlet of the mixed filler denitrification reaction tank is connected with the sedimentation tank, the sludge outlet of the mixed filler denitrification reaction tank is connected to the sedimentation tank through a pump, and finally the sludge is discharged from the sedimentation tank in a sludge form according to the process requirements; wherein the filler in the mixed filler denitrification reaction tank is a mixture of a biodegradable solid-phase slow-release carbon source and an inert filler.
7. The process for deep denitrification of wastewater with high efficiency and low energy consumption as claimed in claim 1, 2, 4 or 5 or the apparatus for deep denitrification of wastewater with high efficiency and low energy consumption as claimed in claim 3 or 6, wherein the small molecular organic substances obtained by degrading the solid carbon source by the microorganisms can be directly utilized by the denitrifying bacteria; the solid phase carbon source comprises the following materials: polyhydroxyalkanoate PHA, polybutylene succinate PBS, polylactic acid PLA, various plant straws, pure cellulose, modified starch and the like.
8. The process or the device for deep denitrification of wastewater with high efficiency and low energy consumption as claimed in claim 7, wherein the form of the solid carbon source in the denitrification reaction tank of the solid carbon source comprises granular, rod-like, filamentous, foamed or other shapes with various three-dimensional structures.
9. The process of claim 1, 2, 4 or 5 or the apparatus of claim 3 or 6, wherein the inert filler comprises one or more of soft filler, semi-soft filler, elastic filler and combination filler.
10. The process or the device for deep denitrification of wastewater with high efficiency and low energy consumption as claimed in claim 7, wherein the polyhydroxyalkanoate PHA material in the biodegradable solid-phase carbon source in the denitrification reaction tank of the solid-phase carbon source has the following structural formula:
in the formula: r1Is H or methyl CH3Or ethyl radical C2H5Or propyl group C3H7；R2Is H or methyl CH3Or ethyl radical C2H5Or propyl group C3H7(ii) a m1 is 1 or 2; m2 is 1 or 2; x is 0 or any natural number from 200 to 25000, y is 0 or any natural number from 200 to 25000, and x and y are not 0 at the same time.
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