CN112939348A - System and method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization - Google Patents

System and method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization Download PDF

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CN112939348A
CN112939348A CN202110143924.7A CN202110143924A CN112939348A CN 112939348 A CN112939348 A CN 112939348A CN 202110143924 A CN202110143924 A CN 202110143924A CN 112939348 A CN112939348 A CN 112939348A
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membrane
phosphorus
anaerobic
aeration
sewage
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隋倩雯
狄斐
魏源送
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Research Center for Eco Environmental Sciences of CAS
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C02F2101/105—Phosphorus compounds
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/007—Modular design
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/15—N03-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F7/00—Aeration of stretches of water
    • 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

Abstract

The invention discloses an integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system and method, wherein the system comprises: the water inlet tank is used for accommodating sewage and introducing the sewage into the membrane aeration reactor; the membrane aeration reactor is connected with the water inlet tank so as to treat the sewage introduced into the membrane aeration reactor from the water inlet tank; wherein, the inside of the membrane aeration reactor is provided with floc mud containing phosphorus-accumulating bacteria, a hollow fiber membrane is arranged in the membrane aeration reactor, the surface of a membrane wire of the hollow fiber membrane is attached with a biological membrane, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are attached to the biological membrane, the ammonia oxidizing bacteria are attached to one side of the biological membrane close to the surface of the membrane wire, and the anaerobic ammonia oxidizing bacteria are attached to one side of the biological membrane far away from the surface of the membrane wire; the water outlet tank is used for receiving the sewage treated by the membrane aeration reactor; by coupling the denitrification dephosphorization and partial nitrosation-anaerobic ammonia oxidation into one reactor, the operation cost is reduced, the occupied area is small, and the operation energy consumption is low.

Description

System and method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a system and a method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization.
Background
The nitrogen and phosphorus removal of sewage is always a hotspot and a difficult point in the research field, the process for treating sewage by the traditional activated sludge method is mature, the process is generally applied to urban sewage treatment and high-concentration organic wastewater treatment projects, the problems of high energy consumption, large chemical agent dosage, high operation cost and the like exist, and the development of energy-saving and consumption-reducing sewage treatment technology and device is needed.
Biological phosphorus removal of wastewater refers to the utilization of the metabolism of microorganisms to remove phosphorus in wastewater, and the microorganisms absorb PO in the wastewater4 3-P forms phosphorus-rich sludge, then phosphorus in the sewage is removed by discharging the phosphorus-rich sludge, and when the sewage is treated by an activated sludge method, the activated sludge is alternately operated in an anaerobic state and an aerobic state, so that phosphorus-accumulating bacteria which excessively accumulate phosphate can be predominantly grown, and the phosphorus content of the activated sludge is higher than that of common activated sludge. Phosphorus-accumulating bacteria in the sludge release phosphorus under an anaerobic state and excessively take up phosphorus under an aerobic/anoxic state. After the phosphorus-rich excess sludge is discharged, the method is mostly adopted in the traditional sewage treatment plants.
The nitrogen removal mechanism of nitrogen wastewater includes two basic processes of nitrification and denitrification. Nitrification is the process of converting ammonia nitrogen into nitrate nitrogen and is mainly completed by two types of aerobic autotrophic bacteria, namely nitrite bacteria and nitrobacteria.
The nitrosation-anaerobic ammoxidation reaction produces certain nitrate while realizing denitrification, and the produced nitrate usually accounts for 10 to 20 percent of the biological denitrification amount, so that the total nitrogen removal rate is low.
However, the reactions in the existing sewage treatment plants cannot be synchronously carried out in the same reaction tank, the nitrogen and phosphorus removal efficiency is not high, the occupied site is large, the energy consumption is high, the sludge yield is high, and the effluent quality is low. At present, the technical problem to be solved urgently is to provide an efficient and high-integration nitrogen and phosphorus removal method, so that the energy consumption is reduced, the sludge yield is reduced, and the effluent quality is improved.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a high-integration integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system, which can complete phosphorus-accumulating bacteria phosphorus absorption, wastewater denitrification and other functions in the same reactor, and realizes the technical progress of reducing energy consumption, reducing sludge yield and improving effluent quality. Meanwhile, the high-integration integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system disclosed by the invention can be used for modifying and upgrading the traditional equipment, and the specific scheme is as follows.
The invention discloses an integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system, which comprises:
the water inlet tank is used for accommodating sewage and introducing the sewage into the membrane aeration reactor;
the membrane aeration reactor is connected with the water inlet tank so as to treat the sewage introduced into the membrane aeration reactor from the water inlet tank; wherein a hollow fiber membrane is arranged in the membrane aeration reactor;
the two ends of the reflux pump are respectively connected with the two ends of the membrane aeration reactor;
a biological membrane is attached to the surface of a membrane wire of the hollow fiber membrane, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are attached to the biological membrane, the ammonia oxidizing bacteria are attached to one side, close to the surface of the membrane wire, of the biological membrane, and the anaerobic ammonia oxidizing bacteria are attached to one side, far away from the surface of the membrane wire, of the biological membrane;
the water outlet tank is used for receiving the sewage treated by the membrane aeration reactor;
wherein, anaerobic reaction is carried out between the phosphorus-accumulating bacteria and the sewage in the membrane aeration reactor, so as to realize anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria.
According to some embodiments of the invention, further comprising an air compressor connected to the hollow fiber membrane.
According to some embodiments of the invention, the biofilm has a bioadhesive amount per membrane filament length of 0.5 mg/cm.
The invention also discloses a method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization, which comprises the following steps:
s1, introducing sewage into the membrane aeration reactor through a water inlet tank, and performing anaerobic reaction on phosphorus-accumulating bacteria in the membrane aeration reactor and the sewage to realize anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria, wherein the phosphorus-accumulating bacteria are accommodated in the membrane aeration reactor in an activated sludge manner;
s2, carrying out bubble-free aeration on the sewage after the anaerobic reaction through a hollow fiber membrane in the membrane aeration reactor, and carrying out nitrogen and phosphorus removal through phosphorus accumulating bacteria, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, wherein the biofilm is attached to the surface of membrane filaments of the hollow fiber membrane, and the ammonia oxidizing bacteria and the anaerobic ammonia oxidizing bacteria are positioned on the biofilm and used for carrying out nitrosation-anaerobic ammonia oxidation reaction during aeration and generating nitrate;
s3, standing and precipitating to separate mud and water, and discharging partial supernatant and partial precipitated sludge;
wherein, in the non-bubble aeration process, the biomembrane forms a gradient aerobic area-anaerobic area from inside to outside, and the generated nitrate and phosphorus accumulating bacteria in the activated sludge generate denitrification dephosphorization.
According to some embodiments of the invention, the integrated nitrosation-anammox synchronous denitrifying phosphorus removal method is a sequencing batch operation to repeatedly perform the S1 to the S3.
According to some embodiments of the present invention, in S1, anaerobic stirring is performed after the wastewater is introduced into the membrane aeration reactor.
According to some embodiments of the invention, the anaerobic stirring is performed for 1.5 to 2.5 hours.
According to some embodiments of the invention, in the step S2, air is introduced into the hollow fiber membrane for aeration, and the aeration time is 1.5-2.5 hours.
According to some embodiments of the present invention, the aeration is performed by intermittent aeration, wherein the aeration flow rate is 0.1-0.15L/min, and the aeration pressure is 10-15 kPa.
According to some embodiments of the invention, the sludge and water are separated by standing and precipitating for 20-40 min, the proportion of the discharged supernatant is 50-60%, and the sludge age after sludge discharge is 20-30 d.
Through the technical scheme, the denitrification dephosphorization and partial nitrosation-anaerobic ammonia oxidation are coupled into the membrane aeration reactor, and two ends of the membrane aeration reactor are respectively connected with the water inlet tank and the water outlet tank, so that the biological nitrogen and phosphorus removal of sewage can be realized by fully utilizing the limited carbon source in the domestic sewage, and the operation cost is reduced. In addition, a heterotropic mass transfer biological structure can be formed on the surfaces of the biological membrane and the membrane wires in a membrane aeration mode, so that organic combination of nitrosation-anaerobic ammonia oxidation of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria is facilitated, autotrophic biological denitrification is efficiently and stably realized, a small amount of nitrate generated by nitrosation-anaerobic ammonia oxidation is released into floc sludge, denitrification dephosphorization reaction is facilitated to further denitrify and dephosphorize, meanwhile, the emission of greenhouse gases in sewage treatment engineering is reduced, the integration level is high, the occupied area is small, the operation energy consumption and the cost are low, and the method is suitable for small-scale sewage treatment device operation or sewage plant upgrading and reconstruction.
Drawings
FIG. 1 schematically illustrates a schematic structural diagram of an integrated nitrosation-anammox synchronous denitrification dephosphorization system according to an embodiment of the disclosure;
FIG. 2 schematically illustrates a flow diagram of a method of integrated nitrosation-anammox synchronous denitrification dephosphorization in an embodiment of the present disclosure;
wherein 1 denotes a water inlet tank, 2 denotes a membrane aeration reactor, 2.1 denotes a water inlet pump, 2.2 denotes a hollow fiber membrane, 2.3 denotes a stirrer, 2.4 denotes a pressure gauge, 2.5 denotes a flow meter, 2.6 denotes an air compressor, 2.7 denotes a reflux pump, and 3 denotes a water outlet tank.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Furthermore, in the following description, descriptions of well-known technologies are omitted so as to avoid unnecessarily obscuring the concepts of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "comprising" as used herein indicates the presence of the features, steps, operations but does not preclude the presence or addition of one or more other features.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be interpreted in an idealized or overly formal manner, for example, SBR is an abbreviation of a sequencing batch activated sludge process, an activated sludge sewage treatment process consisting of five basic processes of water feeding, aeration, sedimentation, drainage, and standby in chronological order in the same reaction tank (vessel), an SBR process.
In order to solve the technical problems, the invention combines denitrification dephosphorization with an integrated nitrosation-anaerobic ammoxidation process based on membrane aeration, realizes synchronous denitrification dephosphorization in the same reactor, has high reactor integration, high denitrification load, low energy consumption, low sludge yield and high effluent quality, provides a new idea on synergistic expansion, is particularly suitable for upgrading and reconstructing established sewage plants, has wide development and application prospects, and has the following specific scheme.
Fig. 1 schematically shows a schematic structural diagram of an integrated nitrosation-anammox synchronous denitrification dephosphorization system according to an embodiment of the disclosure.
The invention discloses an integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system, which comprises a water inlet tank 1, a membrane aeration reactor 2, a reflux pump 2.7 and a water outlet tank 3, as shown in figure 1.
According to some embodiments of the present invention, the inlet tank 1 is used for receiving sewage and for introducing the sewage into the membrane aeration reactor 2.
According to some embodiments of the present invention, the inlet water tank 1 may be an existing sewage tank of a sewage treatment plant, or may be omitted, and a sewage pipe is used to directly feed sewage into the membrane aeration reactor 2.
According to some embodiments of the present invention, the membrane aeration reactor 2 is connected to the feed water tank 1 so as to treat the sewage from the feed water tank 1 into the membrane aeration reactor 2; wherein, a hollow fiber membrane 2.2 is arranged in the membrane aeration reactor 2.
According to some embodiments of the invention, the aeration mode of the hollow fiber membranes 2.2 is bubble-free aeration.
According to some embodiments of the present invention, two ends of the reflux pump 2.7 are connected to two ends of the membrane aeration reactor 2, respectively.
According to some embodiments of the invention, the hollow fiber membrane 2.2 has a biofilm attached to the surface of the membrane filaments, and ammonia oxidizing bacteria and anammox bacteria are attached to the biofilm.
According to some embodiments of the invention, the ammonia oxidizing bacteria are attached to a side of the biofilm proximal to the surface of the membrane filaments and the anammox bacteria are attached to a side of the biofilm distal to the surface of the membrane filaments.
According to some embodiments of the present invention, a Membrane material of an MABR (Membrane-aerated bioreactor) may be used as a load carrier to form a biofilm on a Membrane surface, oxygen inside a mold cavity is diffused from inside, the biofilm sequentially forms an aerobic zone, a facultative zone and an anaerobic zone from inside to outside, and microorganisms perform functional division by using the living environment to form a biofilm structure with mass transfer of dissolved oxygen and a substrate in a different direction, which is beneficial to promoting a stable integrated partial nitrosation-anaerobic ammoxidation reaction.
According to some embodiments of the present invention, the effluent tank 3 is used to receive the sewage after the membrane aeration reactor 2 has treated the sewage.
According to some embodiments of the present invention, the effluent tank 3 may be an existing sewage pool of a sewage treatment plant, or may be omitted, and qualified sewage after treatment may be directly discharged to a preset location.
According to some embodiments of the present invention, the anaerobic reaction of the phosphorus-accumulating bacteria and the sewage is performed in the membrane aeration reactor 2, so as to realize the anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria.
According to some embodiments of the present invention, the membrane aeration reactor 2 is inoculated with excess sludge from municipal sewage treatment plants, which is enriched with phosphorus accumulating bacteria.
According to some embodiments of the invention, the phosphate accumulating bacteria comprise common phosphate accumulating bacteria and denitrifying phosphate accumulating bacteria.
According to some embodiments of the invention, further comprising an air compressor 2.6, the air compressor 2.6 being connected to the hollow fiber membranes 2.2.
According to some embodiments of the invention, the biofilm has a bioadhesive amount per membrane filament length of 0.5 mg/cm.
FIG. 2 schematically shows a flow diagram of a method for integrated nitrosation-anammox synchronous denitrification dephosphorization in an embodiment of the disclosure.
The invention also discloses an integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization method, which comprises the steps of S1, S2 and S3 as shown in figure 2.
According to some embodiments of the present invention, S1, sewage is introduced into the membrane aeration reactor 2 through the water inlet tank 1, and anaerobic reaction is performed between the phosphorus-accumulating bacteria in the membrane aeration reactor 2 and the sewage to realize anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria, and the phosphorus-accumulating bacteria are accommodated in the membrane aeration reactor in the form of activated sludge.
According to some embodiments of the present invention, S2, the sewage after the anaerobic reaction is bubbleless aerated through the hollow fiber membrane 2.2, and nitrogen and phosphorus are removed by the phosphorus accumulating bacteria, the ammonia oxidizing bacteria and the anammox bacteria, wherein the biofilm is attached to the surface of the membrane filaments of the hollow fiber membrane 2.2, and the ammonia oxidizing bacteria and the anammox bacteria are located on the biofilm for performing the nitrosation-anammox reaction and producing nitrate during the aeration.
According to some embodiments of the invention, S3, the sludge is separated by standing the sediment, and a portion of the supernatant is discharged and a portion of the precipitated sludge is discharged.
According to some embodiments of the present invention, the membrane aeration reactor 2 includes an anaerobic reaction stage and an aerobic reaction stage in the operation stage.
According to some embodiments of the invention, in the anaerobic reaction stage, sewage enters the membrane aeration reactor 2 through the first water inlet pump 2.1, the stirrer 2.3 is started while water is fed, anaerobic stirring is carried out, and phosphorus accumulating bacteria utilize a water feeding carbon source to carry out anaerobic phosphorus release and internal carbon source storage.
According to some embodiments of the present invention, in the aerobic reaction stage, the air compressor 2.6 is used to aerate the inside of the hollow fiber membrane 2.2 membrane filaments, and an intermittent aeration mode can be adopted according to the quality of the inlet water and the aeration quantity requirement. Aerating the inside of the die cavity by an air compressor 2.6 to form a biological film structure with anisotropic mass transfer, and respectively forming an aerobic-anoxic gradient biological film structure on the surface of the film wire from inside to outside. The surface of the membrane filaments (aerobic zone in the biomembrane) is subjected to ammonia oxidation under the action of ammonia oxidizing bacteria to oxidize NH in the inlet water4 +Nitrosation of the-N moiety to NO2 -N, further use of NH by anammox bacteria outside the biofilm4 +-N and NO2 -Anammox occurs for-N. Small amount of NO produced by anaerobic ammoxidation3 -and-N enters the mixed solution, and the phosphorus accumulating bacteria utilize nitrate to generate denitrification dephosphorization so as to realize the synchronous removal of nitrogen and phosphorus.
According to some embodiments of the present invention, in the aerobic reaction stage, the membrane aeration reactor 2 contains a slurry-water mixture rich in phosphorus-accumulating bacteria, and uses the influent organics to generate anaerobic phosphorus release and NO to generate nitrogen3 -Denitrifying phosphorus removal is carried out.
According to some embodiments of the invention, the anammox bacteria are carbon-sourced from inorganic carbon compounds and the generation of NO occurs2 -Being an electron acceptor, NH4+For oxidation of electron donorsReduction reaction to produce N2While generating a small amount of NO3 -。。
According to some embodiments of the invention, the phosphorus accumulating bacteria ingest and oxidatively decompose organic matter, a portion of the energy generated is used for phosphorus absorption and phosphorus accumulation synthesis, and a portion is used for ADP and H3PO4Binding, conversion to ATP and storage of phosphorus in the cell as polyphosphate (a high energy inorganic compound) with energy exceeding that required for growth, a process known as phosphate uptake by the phosphate accumulating bacteria. In the treatment process, the purpose of removing phosphorus is achieved by removing high-phosphorus sludge from the system. Hydrolyzing ATP in the phosphorus-accumulating bacteria under the anaerobic condition and in the absence of nitrogen oxide to release H3PO4And energy to form ADP, which is the release of phosphorus from the polyphosphate.
The denitrifying phosphorus accumulating bacteria can utilize oxygen as an electron acceptor and Nitrate (NO) under the condition of oxygen deficiencyX -) The poly-beta-hydroxybutyrate (PHB) is oxidized as an electron acceptor, so that nitrate nitrogen can be converted into nitrogen to overflow the body, and meanwhile, phosphate in sewage is excessively taken, so that the aim of carrying out phosphorus removal and denitrification (denitrogenation) in the same environment at the same time is fulfilled, and nitrogen and phosphorus in the sewage are synchronously removed.
According to some embodiments of the present invention, the membrane aeration reactor 2 comprises a hollow fiber membrane 2.2, a biofilm is attached to the surface of the membrane filaments of the hollow fiber membrane 2.2, and the biofilm forms a gradient aerobic zone-anaerobic zone from the inside to the outside during the bubble-free aeration process.
According to some embodiments of the present invention, the integrated nitrosation-anammox synchronous denitrification dephosphorization method is operated in a sequencing batch mode to repeatedly perform steps S1 to S4.
According to some embodiments of the present invention, in S1, anaerobic stirring is performed after the wastewater is introduced into the membrane aeration reactor 2.
According to some embodiments of the invention, the anaerobic stirring time is 1.5-2.5 hours.
According to some embodiments of the invention, in the step S2, air is introduced into the hollow fiber membrane 2.2 for aeration for 1.5-2.5 hours.
According to some embodiments of the invention, the aeration is performed by intermittent aeration, the aeration flow rate is 0.1-0.15L/min, and the aeration pressure is 10-15 kPa.
According to some embodiments of the invention, the sludge and water are separated by standing and precipitating for 20-40 min, the proportion of the discharged supernatant is 50-60%, and the sludge age after sludge discharge is 20-30 d.
According to some embodiments of the invention, the system disclosed by the invention can be modified and upgraded according to the existing equipment of the sewage treatment plant, so that the sewage treatment efficiency is improved, and the energy consumption is reduced.
Through the technical scheme, the denitrification dephosphorization and partial nitrosation-anaerobic ammonia oxidation are coupled into one reactor, so that the limited carbon source in the domestic sewage is fully utilized to realize biological denitrification and dephosphorization of the sewage, and the operation cost is reduced.
The membrane aeration mode can form a heterotropic mass transfer biological structure, is beneficial to the realization of organic combination of nitrosation-anaerobic ammonia oxidation by ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, is beneficial to the high-efficiency and stable autotrophic biological denitrification, and simultaneously reduces the emission of greenhouse gases in sewage treatment engineering.
The operation mode of membrane aeration is adopted, so that the oxygenation efficiency is improved, the oxygen utilization rate is improved, and the operation energy consumption is greatly reduced.
The integrated level is high, the floor area is small, the operation energy consumption and the cost are low, and the method is suitable for small-scale sewage treatment device operation or sewage plant upgrading and reconstruction. So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the above definitions of the components are not limited to the specific structures, shapes or manners mentioned in the embodiments, and those skilled in the art may easily modify or replace them.
It is also noted that, unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing dimensions, range conditions, and so forth, used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.
It will be appreciated by a person skilled in the art that various combinations and/or combinations of features described in the various embodiments and/or in the claims of the invention are possible, even if such combinations or combinations are not explicitly described in the invention. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present invention may be made without departing from the spirit or teaching of the invention. All such combinations and/or associations fall within the scope of the present invention.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization system is characterized by comprising:
the water inlet tank is used for accommodating sewage and introducing the sewage into the membrane aeration reactor;
the membrane aeration reactor is connected with the water inlet tank so as to treat the sewage introduced into the membrane aeration reactor from the water inlet tank; wherein a hollow fiber membrane is arranged in the membrane aeration reactor;
the two ends of the reflux pump are respectively connected with the two ends of the membrane aeration reactor;
a biological membrane is attached to the surface of a membrane wire of the hollow fiber membrane, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are attached to the biological membrane, the ammonia oxidizing bacteria are attached to one side, close to the surface of the membrane wire, of the biological membrane, and the anaerobic ammonia oxidizing bacteria are attached to one side, far away from the surface of the membrane wire, of the biological membrane;
the water outlet tank is used for receiving the sewage treated by the membrane aeration reactor;
wherein, anaerobic reaction is carried out between the phosphorus-accumulating bacteria and the sewage in the membrane aeration reactor, so as to realize anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria.
2. The system of claim 1, further comprising an air compressor coupled to the hollow fiber membranes.
3. The system of claim 1, wherein the biofilm has a bioadhesive amount per membrane filament length of 0.5 mg/cm.
4. An integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization method is characterized by comprising the following steps:
s1, introducing sewage into the membrane aeration reactor through a water inlet tank, and performing anaerobic reaction on phosphorus-accumulating bacteria in the membrane aeration reactor and the sewage to realize anaerobic phosphorus release and carbon source storage of the phosphorus-accumulating bacteria, wherein the phosphorus-accumulating bacteria are accommodated in the membrane aeration reactor in an activated sludge manner;
s2, carrying out bubble-free aeration on the sewage after the anaerobic reaction through a hollow fiber membrane in the membrane aeration reactor, and carrying out nitrogen and phosphorus removal through phosphorus accumulating bacteria, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, wherein the biofilm is attached to the surface of membrane filaments of the hollow fiber membrane, and the ammonia oxidizing bacteria and the anaerobic ammonia oxidizing bacteria are positioned on the biofilm and used for carrying out nitrosation-anaerobic ammonia oxidation reaction during aeration and generating nitrate;
s3, standing and precipitating to separate mud and water, and discharging partial supernatant and partial precipitated sludge;
wherein, in the non-bubble aeration process, the biomembrane forms a gradient aerobic area-anaerobic area from inside to outside, and the generated nitrate and phosphorus accumulating bacteria in the activated sludge generate denitrification dephosphorization.
5. The method of claim 4, wherein the integrated nitrosation-anammox synchronous denitrification phosphorus removal method is a sequencing batch operation to repeatedly perform the S1 to the S3.
6. The method according to claim 4 or 5, wherein in S1, the membrane aeration reactor is anaerobically agitated after the wastewater is introduced.
7. The method according to claim 6, wherein the anaerobic stirring time is 1.5-2.5 h.
8. The method according to claim 4 or 5, wherein in S2, air is aerated into the hollow fiber membrane for aeration for 1.5-2.5 h.
9. The method according to claim 8, wherein the aeration is performed by intermittent aeration at an aeration flow rate of 0.1 to 0.15L/min and an aeration pressure of 10 to 15 kPa.
10. The method according to claim 4 or 5, wherein the sludge is subjected to sludge-water separation by standing and settling for 20-40 min, the proportion of the discharged supernatant is 50-60%, and the sludge age after sludge discharge is 20-30 d.
CN202110143924.7A 2021-02-02 2021-02-02 System and method for integrated nitrosation-anaerobic ammonia oxidation synchronous denitrification dephosphorization Pending CN112939348A (en)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张雨辰: "《曝气膜生物反应器处理生活污水及强化除磷试验研究》", 15 September 2019 *
赵旭东: "《膜曝气部分亚硝化—厌氧氨氧化耦合生物膜脱氮的数学模拟》", 1 February 2011 *

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