CN111747530A - Microbial electrochemical coupling membrane bioreactor system and sewage treatment method - Google Patents
Microbial electrochemical coupling membrane bioreactor system and sewage treatment method Download PDFInfo
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Abstract
The invention discloses a microbial electrochemical coupling membrane bioreactor system and a sewage treatment method. Comprises an airlift loop membrane bioreactor, a microbial electrochemical device and a nitrogen and phosphorus recovery area. The air-lift circulation type membrane bioreactor comprises a plurality of air-lift circulation type membrane bioreactor units, and each air-lift circulation type membrane bioreactor unit comprises an anoxic zone, an anaerobic zone and an aerobic zone; the microbial electrochemical device comprises an anode electrode, a cathode electrode and an external circuit connected with the anode and the cathode; the nitrogen and phosphorus recovery zone comprises an anion exchange membrane, a cation exchange membrane and a zone between the anion exchange membrane and the cation exchange membrane. The system has the high-efficiency sewage treatment and solid-liquid separation capabilities of the air-lift circulation type membrane bioreactor, reduces the sludge backflow energy consumption, combines the characteristics of anaerobic and aerobic area distribution of a circulation system, further strengthens the integral nitrogen and phosphorus removal capability by coupling a microbial electrochemical system, and further improves the effluent quality.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a microbial electrochemical coupling membrane bioreactor system and a sewage treatment method.
Background
Resource shortage and water pollution are serious problems in human society. The Membrane Bioreactor (MBR) can realize efficient solid-liquid separation by utilizing a membrane component as a novel sewage treatment process, effectively improves the sludge concentration, further improves the effluent quality and reduces the occupied area. MBR has been widely used in the sewage treatment fields of domestic sewage, industrial sewage, landfill leachate and the like in cities and towns and rural areas. MBR process technology challenges: (1) the conventional MBR has high aeration energy consumption; (2) a single MBR can effectively remove organic matters and ammonia nitrogen, but the removal of total nitrogen and total phosphorus is not ideal; (3) the phosphorus is transferred to sludge during the treatment process and then discarded. In view of the above challenges and difficulties, a novel wastewater treatment technology for recovering nitrogen and phosphorus becomes a potential development direction by further developing and saving energy consumption on the basis of an MBR technology.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a microbial electrochemical coupling membrane bioreactor system and a sewage treatment method. The air-lift circulation type membrane bioreactor combined with the microbial electrochemical system is used for carrying out the enhanced biochemical treatment process and the solid-liquid separation process of the wastewater, so that the air-lift circulation type membrane bioreactor has the high-efficiency sewage treatment and solid-liquid separation capability, reduces the sludge backflow energy consumption, is combined with the characteristic of anaerobic and aerobic area distribution of the circulation system, is further coupled with the microbial electrochemical system to enhance the integral denitrification and dephosphorization capability, and further improves the quality of the effluent.
In one aspect of the invention, the invention provides a microbial electrochemical coupling membrane bioreactor system. According to an embodiment of the present invention, the microbial electrochemical coupling membrane bioreactor system comprises:
the air-lift circulation type membrane bioreactor comprises a plurality of air-lift circulation type membrane bioreactor units, the air-lift circulation type membrane bioreactor units are communicated with each other, and each air-lift circulation type membrane bioreactor unit comprises an anoxic zone, an anaerobic zone and an aerobic zone; the aerobic zone comprises an aerobic upflow zone and an aerobic downflow zone; the airlift loop type membrane bioreactor unit also comprises a membrane component arranged in the aerobic upflow zone;
the microbial electrochemical device comprises an anode electrode arranged in the anaerobic zone, a cathode electrode arranged in the aerobic zone and an external circuit connected with the anode and the cathode;
the nitrogen and phosphorus recovery area comprises an anion exchange membrane, a cation exchange membrane and an area between the adjacent anion exchange membranes, which are arranged between the adjacent anion/anode areas.
According to the microbial electrochemical coupled membrane bioreactor system disclosed by the embodiment of the invention, the air-lift circulating type membrane bioreactor combined with the microbial electrochemical system is utilized to carry out the enhanced biochemical treatment process and the solid-liquid separation process of wastewater, so that the system not only has the high-efficiency sewage treatment and solid-liquid separation capacity of the air-lift circulating type membrane bioreactor and reduces the sludge backflow energy consumption, but also is combined with the characteristic of anaerobic and aerobic area distribution of the circulating system, the overall nitrogen and phosphorus removal capacity is further enhanced by the coupled microbial electrochemical system, and the effluent quality is further improved.
In addition, the air-lift circulation type membrane bioreactor system according to the above embodiment of the invention may also have the following additional technical features:
in some embodiments of the invention, the anode electrode comprises an anode carbon cloth and an anode carbon brush; the cathode electrode includes a cathode carbon cloth and a cathode carbon brush.
In some embodiments of the present invention, the microbial electrochemical device further comprises a control unit disposed between the cathode and the anode. Therefore, the electric field can be strengthened by applying voltage to the cathode and the anode through the external circuit and the control unit, so that the directional migration capability of phosphate ions and ammonium ions is strengthened, and the capabilities of nitrogen and phosphorus removal and nitrogen and phosphorus recovery are improved.
In some embodiments of the invention, the nitrogen and phosphorus recovery zone comprises at least two sets of anion exchange membranes and cation exchange membranes, the anion exchange membranes and the cation exchange membranes being alternately distributed.
In some embodiments of the invention, the cathode electrode is disposed in the aerobic down-flow region.
In some embodiments of the invention, a first baffle plate is arranged between the anoxic zone and the anaerobic zone, a first reserved gap is arranged above the first baffle plate, and the anoxic zone and the anaerobic zone are communicated through the first reserved gap; a second baffle plate is arranged between the anaerobic zone and the aerobic upflow zone, a second reserved gap is arranged below the second baffle plate, and the anaerobic zone is communicated with the aerobic upflow zone through the second reserved gap; a third flow folding plate is arranged between the aerobic upflow zone and the aerobic downflow zone, a third reserved gap is arranged above the third flow folding plate, and the aerobic upflow zone is communicated with the aerobic downflow zone through the third reserved gap; a fourth baffle plate is arranged between the aerobic downflow zone and the anoxic zone, a fourth reserved gap is arranged below the fourth baffle plate, and the aerobic downflow zone is communicated with the anoxic zone through the fourth reserved gap. Therefore, the air-lift circulation type membrane bioreactor device utilizes the baffle plate to control the water flow direction, does not need to carry out sludge backflow, reduces the sewage operation energy consumption, generates anaerobic zones, anoxic zones and aerobic zones which are alternately distributed, and is favorable for strengthening the removal capacity of pollutants.
In some embodiments of the invention, the airlift loop membrane bioreactor unit further comprises: a first aeration device; the first aeration device is arranged below the membrane component, and the first aeration device is used for pushing water flow to circularly flow.
In some embodiments of the invention, the airlift loop membrane bioreactor unit further comprises: and the second aeration device is arranged at the bottom of the aerobic downcast zone.
In some embodiments of the invention, the second aeration device is a microporous aeration head, and the microporous aeration head is used for regulating aerobic reaction and promoting sludge suspension.
In some embodiments of the present invention, the membrane module is a submerged membrane module, and the membrane used in the submerged membrane module is an ultrafiltration membrane or a microfiltration membrane.
In another aspect of the present invention, the present invention provides a method for sewage treatment by using the above-mentioned microbial electrochemical coupling membrane bioreactor system, comprising:
(1) introducing newly-fed sewage and the mixed liquid treated in the last aerobic zone into the anoxic zone, mixing, and carrying out denitrification process by denitrifying bacteria;
(2) the mixed liquid in the anoxic zone enters an anaerobic zone, electrogenic bacteria attached to an anode electrode decompose organic matters, generated electrons are transferred to an external circuit to generate an electric field, ammonium ions in the mixed liquid are directionally migrated under the action of the electric field and enter a nitrogen and phosphorus recovery zone through a cation exchange membrane;
(3) the mixed liquid in the anaerobic zone enters an aerobic zone, the whole water flow is driven to rise under the pushing of aeration of an aeration pipe, the mixed liquid is filtered by a membrane component, and the mixed liquid which is not separated by the membrane component enters an aerobic down-flow section; the cathode electrode receives electrons transferred by an external circuit, oxygen is reduced, an electric field is generated, phosphate ions in the mixed solution are directionally migrated under the action of the electric field and enter a nitrogen and phosphorus recovery area through an anion exchange membrane; circularly flowing the residual sewage mixed liquid into an anoxic zone;
(4) the membrane effluent of the aerobic zone in the step (3) enters a diluting chamber of a nitrogen and phosphorus recovery zone, and residual phosphate radical ions and ammonium radical ions in the membrane effluent respectively enter a thickening chamber through an anion/cation exchange membrane under the action of an anion and cation electrode electric field, so that nitrogen and phosphorus in the effluent are further removed; the nitrogen and phosphorus elements are continuously enriched in the concentration chamber and are connected with an external circulating bottle through a pipeline, and the nitrogen and phosphorus elements are periodically recovered.
According to the method for treating the sewage, provided by the embodiment of the invention, the sewage is subjected to three treatment processes of anoxic treatment, anaerobic treatment and aerobic treatment, and meanwhile, a bioelectrochemical system is utilized, so that the integral nitrogen and phosphorus removal capability is further enhanced, the effluent quality is further improved, and the aim of recovering nitrogen and phosphorus can be achieved.
In some embodiments of the present invention, the directional migration of phosphate ions and ammonium ions in steps (2), (3), and (4) is enhanced by applying an external voltage across the cathode and anode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a microbial electrochemical coupling membrane bioreactor system according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view A-A of a microbial electrochemical coupling membrane bioreactor system according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view B-B of a microbial electrochemical coupling membrane bioreactor system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, four, five, six, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, the invention provides a microbial electrochemical coupling membrane bioreactor system. Referring to fig. 1 to 3, according to an embodiment of the present invention, the microbial electrochemical coupling membrane bioreactor system includes:
the air-lift circulation type membrane bioreactor comprises a plurality of air-lift circulation type membrane bioreactor units, all the air-lift circulation type membrane bioreactor units are communicated with each other, and each air-lift circulation type membrane bioreactor unit comprises an anoxic zone 100, an anaerobic zone 200 and an aerobic zone 300; the aerobic zone comprises an aerobic upflow zone 310 and an aerobic downflow zone 320; the airlift loop type membrane bioreactor unit also comprises a membrane module 330 arranged in the aerobic upflow zone 310.
In some embodiments of the present invention, a first baffle plate 101 is disposed between the anoxic zone 100 and the anaerobic zone 200, a first reserved gap 102 is disposed above the first baffle plate, and the anoxic zone 100 and the anaerobic zone 200 are communicated through the first reserved gap 102; a second baffle plate 201 is arranged between the anaerobic zone 200 and the aerobic upflow zone 310, a second reserved gap 202 is arranged below the second baffle plate 201, and the anaerobic zone 200 is communicated with the aerobic upflow zone 310 through the second reserved gap 202; a third flow folding plate 311 is arranged between the aerobic upflow zone 310 and the aerobic downflow zone 320, a third reserved gap 312 is arranged above the third flow folding plate 311, and the aerobic upflow zone 310 is communicated with the aerobic downflow zone 320 through the third reserved gap 312; a fourth baffle 321 is arranged between the aerobic downflow zone 320 and the anoxic zone 100, a fourth reserved gap 322 is arranged below the fourth baffle 321, and the aerobic downflow zone 320 is communicated with the anoxic zone 100 through the fourth reserved gap 322. Therefore, the air-lift circulation type membrane bioreactor device utilizes the baffle plate to control the water flow direction, does not need to carry out sludge backflow, reduces the sewage operation energy consumption, generates anaerobic zones, anoxic zones and aerobic zones which are alternately distributed, and is favorable for strengthening the removal capacity of pollutants.
In some embodiments of the present invention, referring to FIG. 2, the airlift loop membrane bioreactor unit further comprises a first aeration device 340 disposed below the membrane module 330; preferably, the first aeration device is an aeration pipe. Therefore, the air-lift circulation type membrane bioreactor device pushes water flow through aeration.
In some embodiments of the invention, the airlift loop membrane bioreactor unit further comprises: and the second aeration device 350 is arranged at the bottom of the aerobic downcast zone. Preferably, the second aeration device may be a microporous aeration head. The sludge is prevented from settling under the action of the ascending air flow by the aeration of the deepwater microporous aeration head.
It can be understood that in the airlift membrane bioreactor unit, the oxygen content of the aerobic upflow zone 310 and the oxygen content of the aerobic downflow zone 320 are relatively high, which can provide aerobic conditions for the microorganisms in the sewage; with the running of the sewage and the consumption of oxygen by the sludge and the microorganisms attached to the carriers in the reaction process, the oxygen content in the water is reduced, and further, the anoxic zone 100 can provide an anoxic condition for the microorganisms in the sewage, and the anaerobic zone 200 can provide an anaerobic condition for the microorganisms in the sewage.
In some embodiments of the invention, the membrane module is a submerged membrane module. It should be noted that the specific type of the submerged membrane module is not limited, and those skilled in the art can select the membrane module according to actual needs, for example, ultrafiltration membrane or microfiltration membrane can be used.
According to some embodiments of the invention, the volume of the aerobic zone is set to be V1, the sum of the volumes of the anoxic zone and the anaerobic zone is set to be V2, and V1 is V2 ═ 1 (2-4). Therefore, the requirement of anaerobic process on anaerobic environment can be further satisfied. If the sum of the volumes of the anoxic zone and the anaerobic zone is too small, the anoxic denitrification process is possibly insufficient, and the total nitrogen removal effect is reduced; if the sum of the volumes of the anoxic zone and the anaerobic zone is too large, a large amount of suspended sludge can be settled before entering the aerobic upflow zone, the sludge concentration is reduced, and the overall biochemical degradation capability is reduced. Preferably, V1: V2 ═ 1: 3. Therefore, the requirement of anaerobic process on anaerobic environment can be further satisfied. It should be noted that the air-lift loop type membrane bioreactor described in the above embodiment includes a plurality of air-lift membrane bioreactor units (also referred to as MBR tanks), for example, two, three, four, six, etc. During operation, the MBR tanks can work without mutual interference, aeration operation is carried out simultaneously, and the MBR tank has strong capacity of resisting the change of hydraulic load. After sewage to be treated enters one airlift membrane bioreactor unit in the system, the sewage is repeatedly treated by a plurality of treatment units, and the treated water is collected from a membrane component of the airlift membrane bioreactor unit and is discharged through a water outlet pipeline.
The microbial electrochemical device comprises an anode electrode 400 arranged in the anaerobic zone, a cathode electrode 500 arranged in the aerobic zone and an external circuit connected with the anode and the cathode. The microbial electrochemical device attaches microbes to the anaerobic zone through the anode electrode 400, so that electrons are provided for the cathode electrode 500 while the organic matter treatment capacity is improved, the cathode electrode 500 combines dissolved oxygen aerated by the membrane zone with electron protons to generate water, current is formed between the cathode and the anode, the organic matter degradation process of the anode is further promoted, and the sewage treatment capacity is improved.
In the embodiment of the present invention, the specific position of the cathode electrode disposed in the aerobic zone is not particularly limited, and one skilled in the art can optionally select the cathode electrode according to practical situations, and as a preferred scheme, the cathode electrode is disposed in the aerobic down-flow zone.
As a preferable mode, the microbial electrochemical device further comprises a control unit arranged between the cathode and the anode.
In some embodiments of the present invention, referring to fig. 3, the anode electrode 400 includes an anode carbon cloth 410 and an anode carbon brush 420; the cathode 500 includes a cathode carbon cloth 510 and a cathode carbon brush 520; the carbon cloth electrode is arranged near the ion exchange membrane in parallel, so that a stable electric field is guaranteed to be generated to provide a driving force for ion migration, the carbon brush electrode is used for improving the specific surface area of the electrode, attachment of more microorganisms is facilitated, the removal capacity of organic matters and the voltage of a cathode and an anode can be enhanced, the electric field strength is further enhanced, and the directional migration process of ions is facilitated.
Nitrogen phosphorus recuperation zone 600, refer to fig. 3, nitrogen phosphorus recuperation zone is including setting up anion exchange membrane, cation exchange membrane and the region between the adjacent anion exchange membrane between the adjacent anion/anode district. As a preferable scheme, the nitrogen and phosphorus recovery area is provided with anion and cation exchange membranes (at least two groups) which are alternately stacked. The cathode separation region and the nitrogen and phosphorus recovery region are anion exchange membranes 610, the anode separation region and the nitrogen and phosphorus recovery region are cation exchange membranes 620, and the rest anion exchange membranes are alternately distributed. The anion-cation exchange membranes which are alternately distributed separate nitrogen and phosphorus recovery into a dense chamber and a dilute chamber, wherein 1, 3 and 5 are dense chambers, and 2 and 4 are dilute chambers. The concentration chamber is connected with a recovery bottle through a pipeline, and the internal solution is continuously circulated and periodically recovered; the membrane effluent is discharged after passing through the fresh chamber. The system utilizes an electric field of a microbial electrochemical system to drive ammonium ions and phosphate ions to respectively migrate from membrane effluent water solutions of an anode region (anaerobic region), a cathode region (aerobic region) and a dilute chamber and enter a concentrated chamber of a nitrogen and phosphorus recovery region.
In the embodiment of the invention, the nitrogen and phosphorus recovery area is coupled with the microbial electrochemical device, and an electric field formed by potential difference between a cathode and an anode of the microbial electrochemical device can effectively push anions and cations to directionally move, wherein cations (such as ammonium ions) directionally move from the anode area to the cathode area, enter the nitrogen and phosphorus recovery area through a cation exchange membrane, and are blocked by the anion exchange membrane to be retained in the nitrogen and phosphorus recovery area; the anions (such as phosphate ions) move from the cathode region to the anode region in a directional manner, enter the nitrogen and phosphorus recovery region through the anion exchange membrane, and are blocked and retained in the nitrogen and phosphorus recovery region by the cation exchange membrane; ammonium ions and phosphate ions are concentrated and enriched in the concentration chamber of the nitrogen and phosphorus recovery area, the nitrogen and phosphorus removal capacity of the system is improved, and meanwhile, the phosphate and ammonium ions enriched in the concentration chamber can be further recovered in the form of magnesium ammonium phosphate. Meanwhile, forward voltage is applied to the cathode and the anode through the external circuit and the control unit, so that the potential between the electrodes can be effectively improved, an electric field is strengthened, the migration rate of ammonium ions and phosphate ions is further improved, and the removal capacity of the device for nitrogen and phosphorus is further improved.
The microbial electrochemical coupling membrane bioreactor system provided by the embodiment of the invention has at least one of the following advantages: (1) the coupling device provided by the embodiment of the invention has the characteristics and functions of an airlift loop type membrane bioreactor system and a microbial electrochemical system, has the advantages of strong sewage treatment capacity, no sludge backflow energy consumption, good solid-liquid separation, high quality and stability of effluent and the like, further improves the organic matter and nitrogen and phosphorus removal capacity of the system, and can recover part of nitrogen and phosphorus resources. (2) The electrode of the microbial electrochemical system can be used as a carrier, so that the biomass of the membrane bioreactor system is effectively improved, and the organic matter removal capacity is improved; and simultaneously, the cathode and the anode generate an electric field to provide a driving electric field for recovering nitrogen and phosphorus. (3) Compared with the conventional microbial electrochemical system, the cathode can directly utilize the oxygen in the aeration zone of the membrane bioreactor system, and does not need to additionally consume oxidant or additionally supply oxygen, thereby saving energy consumption. (4) Under the condition of external voltage, the coupling system combines the characteristics of the alternate distribution of anoxic, anaerobic and aerobic areas of the air-lift loop membrane bioreactor, and can strengthen an electric field and improve the nitrogen and phosphorus recovery capability.
In a second aspect of the present invention, the present invention provides a method for sewage treatment by using the above-mentioned membrane bioreactor system with microbial electrochemical coupling, the method comprises introducing sewage into a reactor from an anoxic zone, repeatedly treating the sewage by a plurality of anoxic, anaerobic and aerobic treatment units, and finally collecting the treated water from a membrane module and flowing out, wherein the specific process comprises:
s1: introducing newly-fed sewage and the mixed liquor treated in the last aerobic zone into the anoxic zone, mixing, and carrying out partial denitrification process in the anoxic zone.
In the step, the specific reaction is as follows, sewage is mixed and enters the anoxic zone 100, and denitrifying bacteria perform a denitrifying process by using nitrate and organic matters, so that the aims of partial decarburization and denitrification are fulfilled.
S2: and (S1) the mixed liquid in the anoxic zone enters an anaerobic zone, and the processes of decarburization and ammonium ion recovery are carried out in the anaerobic zone. In the step, after the mixed liquid in the anoxic zone 100 enters the anaerobic zone 200, (1) the electrogenic bacteria attached to the anode 410/420 decompose the organic matters under anaerobic conditions, released electrons are transferred to the cathode by an external circuit to generate an electric field, ammonium ions in the mixed liquid directionally migrate under the action of the electric field and enter the nitrogen and phosphorus recovery zone through a cation exchange membrane, and the purposes of improving the degradation of the organic matters in the anode and recovering the ammonium ions are achieved in the whole process; (2) the phosphorus accumulating bacteria utilize ATP to absorb organic matters to form carbon source energy storage substances, and a small amount of phosphorus-containing ADP is generated and released in the process.
S3: the mixed liquid in the anaerobic zone in the step S2 enters an aerobic zone, and under the pushing of the aeration device, the whole water flow is driven to rise, so as to provide a driving force for the operation of the whole air-lift circulation type MBR, meanwhile, the membrane module 330 is concentrated in the aerobic upflow zone 310, the water is filtered out by the membrane module through the air-lift effect, and the water flow rises to form the cross flow filtration of the membrane while the water is separated, so that the cleanness of the membrane surface is ensured, and the stable operation of the membrane separation is maintained. The sewage and sludge which are not separated by the membrane module 330 are pushed into the aerobic down-flow zone 320. The aerobic downflow section 320 is provided with a cathode carbon brush 510 and a cathode carbon cloth 520, in which the processes of decarburization, dephosphorization, ammonia nitrogen removal and phosphate ion recovery occur, and the remaining sewage mixed liquid flows into the anoxic zone of the next reaction unit.
The specific reaction in the step is as follows, the mixed solution enters an aerobic condition of an aerobic zone (1) the cathode receives electrons transferred by an external circuit, the dissolved oxygen is reduced to generate an electric field, phosphate ions in the mixed solution are directionally migrated under the action of the electric field and enter a nitrogen and phosphorus recovery zone through an anion exchange membrane, and the purposes of improving organic matter degradation and recovering phosphate are achieved in the whole process; (2) the aerobic bacteria on the mixed solution and the carrier consume a large amount of dissolved oxygen to remove organic matters; (3) nitrifying bacteria in the mixed solution and the carrier carry out a nitrification process of ammonium ions to remove part of ammonia nitrogen; (4) the phosphorus accumulating bacteria in the mixed solution is subjected to a sufficient aerobic metabolic process, and the process absorbs most of phosphate in the sewage to achieve the aim of removing phosphorus.
In the step (1), phosphate ions migrate directionally under the promotion of an electric field, enter the nitrogen and phosphorus recovery region 600 through the anion exchange membrane 610, are intercepted by the cation exchange membrane 620, and stay in the nitrogen and phosphorus recovery region 600. Ammonium ions and phosphate ions are concentrated and enriched in a concentration chamber of a nitrogen and phosphorus recovery area, and can be further recovered in the form of magnesium ammonium phosphate, so that the purpose of recovering nitrogen and phosphorus in sewage is achieved, and meanwhile, the migration resistance of ions is reduced after the precipitates are formed, and the continuous occurrence of ion migration is facilitated.
S4: step S3, enabling the membrane effluent of the aerobic zone to enter a diluting chamber of a nitrogen and phosphorus recovery zone, and enabling residual phosphate ions and ammonium ions in the membrane effluent to respectively enter a concentrating chamber through an anion/cation exchange membrane under the action of an anion and cation electrode electric field so as to further remove nitrogen and phosphorus gathered in the effluent; the nitrogen and phosphorus elements are continuously enriched in the concentration chamber and are connected with an external circulating bottle through a pipeline, and the nitrogen and phosphorus elements are periodically recovered.
According to the method for treating the sewage, provided by the embodiment of the invention, the sewage is subjected to three treatment processes of anoxic treatment, anaerobic treatment and aerobic treatment, and meanwhile, a bioelectrochemical system is utilized, so that the integral nitrogen and phosphorus removal capability is further enhanced, the effluent quality is further improved, and the aim of recovering nitrogen and phosphorus can be achieved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A microbial-electrochemical coupling membrane bioreactor system, comprising:
the air-lift circulation type membrane bioreactor comprises a plurality of air-lift circulation type membrane bioreactor units, all the air-lift circulation type membrane bioreactor units are communicated with each other, and each air-lift circulation type membrane bioreactor unit comprises an anoxic zone, an anaerobic zone and an aerobic zone; the aerobic zone comprises an aerobic upflow zone and an aerobic downflow zone; the airlift loop type membrane bioreactor unit also comprises a membrane component arranged in the aerobic upflow zone;
the microbial electrochemical device comprises an anode electrode arranged in the anaerobic zone, a cathode electrode arranged in the aerobic zone and an external circuit connected with the anode and the cathode;
the nitrogen and phosphorus recovery area comprises an anion exchange membrane, a cation exchange membrane and an area between the adjacent anion exchange membranes, which are arranged between the adjacent anion/anode areas.
2. The microbial-electrochemically-coupled membrane bioreactor system according to claim 1, wherein the anode electrode comprises an anode carbon cloth and an anode carbon brush;
the cathode electrode includes a cathode carbon cloth and a cathode carbon brush.
3. The microbial-electrochemically-coupled membrane bioreactor system according to claim 1, wherein the microbial-electrochemical device further comprises a control unit disposed between the anode and the cathode.
4. The microbial electrochemically coupled membrane bioreactor system according to claim 1, wherein the nitrogen and phosphorus recovery zone comprises at least two sets of anion exchange membranes and cation exchange membranes, the anion exchange membranes and the cation exchange membranes being alternately distributed.
5. The membrane bioreactor system according to claim 1, wherein the cathode electrode is disposed in the aerobic down-flow zone.
6. The microbial electrochemical coupling membrane bioreactor system according to claim 1, wherein a first baffle plate is arranged between the anoxic zone and the anaerobic zone, a first reserved gap is arranged above the first baffle plate, and the anoxic zone and the anaerobic zone are communicated through the first reserved gap; a second baffle plate is arranged between the anaerobic zone and the aerobic upflow zone, a second reserved gap is arranged below the second baffle plate, and the anaerobic zone is communicated with the aerobic upflow zone through the second reserved gap; a third flow folding plate is arranged between the aerobic upflow zone and the aerobic downflow zone, a third reserved gap is arranged above the third flow folding plate, and the aerobic upflow zone is communicated with the aerobic downflow zone through the third reserved gap; a fourth baffle plate is arranged between the aerobic downflow zone and the anoxic zone, a fourth reserved gap is arranged below the fourth baffle plate, and the aerobic downflow zone is communicated with the anoxic zone through the fourth reserved gap.
7. The microbial electrochemically coupled membrane bioreactor system of claim 1, wherein the airlift loop membrane bioreactor unit further comprises: a first aeration device; the first aeration device is arranged below the membrane component, and water flow is pushed to circularly flow by the first aeration device;
optionally, the airlift loop membrane bioreactor unit further comprises: the second aeration device is arranged at the bottom of the aerobic downcast zone;
optionally, the second aeration device is a microporous aeration head, and the microporous aeration head is used for regulating aerobic reaction and promoting sludge suspension.
8. The microbial-electrochemical coupled membrane bioreactor system of claim 1, wherein the membrane module is a submerged membrane module; the membrane adopted by the immersed membrane component is an ultrafiltration membrane or a microfiltration membrane.
9. A method for sewage treatment using the microbial electrochemically coupled membrane bioreactor system of any one of claims 1 to 8, comprising:
(1) introducing newly-fed sewage and the mixed liquid treated in the last aerobic zone into the anoxic zone, mixing, and carrying out denitrification process by denitrifying bacteria;
(2) the mixed liquid in the anoxic zone enters an anaerobic zone, electrogenic bacteria attached to an anode electrode decompose organic matters, generated electrons are transferred to an external circuit to generate an electric field, ammonium ions in the mixed liquid are directionally migrated under the action of the electric field and enter a nitrogen and phosphorus recovery zone through a cation exchange membrane;
(3) the mixed liquid in the anaerobic zone enters an aerobic zone, the whole water flow is driven to rise under the pushing of aeration of an aeration pipe, the mixed liquid is filtered by a membrane component, and the mixed liquid which is not separated by the membrane component enters an aerobic down-flow section; the cathode electrode receives electrons transferred by an external circuit, oxygen is reduced, an electric field is generated, phosphate ions in the mixed solution are directionally migrated under the action of the electric field and enter a nitrogen and phosphorus recovery area through an anion exchange membrane; circularly flowing the residual sewage mixed liquid into an anoxic zone;
(4) the membrane effluent of the aerobic zone in the step (3) enters a diluting chamber of a nitrogen and phosphorus recovery zone, and residual phosphate radical ions and ammonium radical ions in the membrane effluent respectively enter a thickening chamber through an anion/cation exchange membrane under the action of an anion and cation electrode electric field, so that nitrogen and phosphorus in the effluent are further removed; the nitrogen and phosphorus elements are continuously enriched in the concentration chamber and are connected with an external circulating bottle through a pipeline, and the nitrogen and phosphorus elements are periodically recovered.
10. The method according to claim 9, wherein the directional migration of phosphate and ammonium ions in steps (2), (3) and (4) is enhanced by applying an external voltage across the cathode and anode.
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| CN113461142A (en) * | 2021-07-07 | 2021-10-01 | 清华大学 | Method for simultaneously removing organic matters in self-driven bottom mud and nitrate in underground water and application of method |
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