CN111362401A - Utilizing micron Fe3O4Sewage treatment method for strengthening anaerobic dynamic membrane bioreactor - Google Patents
Utilizing micron Fe3O4Sewage treatment method for strengthening anaerobic dynamic membrane bioreactor Download PDFInfo
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- 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
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/2866—Particular arrangements for anaerobic reactors
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Abstract
The invention relates to the technical field of anaerobic dynamic membrane bioreactors, in particular to a method for utilizing micron Fe3O4A sewage treatment method for strengthening an anaerobic dynamic membrane bioreactor comprises the following steps: 1) firstly, micron Fe is added into a closed anaerobic dynamic membrane bioreactor without a membrane component3O4And inoculating sludge with the grain diameter of more than micron Fe3O4(ii) a Then stirring to obtain micron Fe3O4And the magnetic anaerobic sludge is fully and uniformly mixed with the anaerobic activated sludge to form the magnetic anaerobic sludge. 2) And (3) placing a membrane component in the reactor for forming the magnetic anaerobic sludge, then introducing sewage into the reactor and continuously stirring, and entering the next stage after the magnetic anaerobic dynamic membrane is formed. 3) And when the flux of the membrane module is reduced to a set value, taking out the membrane module for washing for circulation of the next period. The invention passes the micron Fe3O4The forming time of the anaerobic dynamic membrane is shortened, the formed anaerobic dynamic membrane is improved, the pollution of the membrane is effectively controlled, and the lifting position is improvedThe purpose of the physical effect.
Description
Technical Field
The invention relates to the technical field of anaerobic dynamic membrane bioreactors, in particular to a method for utilizing micron Fe3O4Strengthening the sewage treatment method of the anaerobic dynamic membrane bioreactor.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The anaerobic sewage treatment process has the advantages of low capital construction operating cost, low sludge yield, capability of recycling biogas energy, no need of aeration, low energy consumption and the like, and is widely concerned by the field of water environment. However, the problem of sludge loss has been a significant problem since the development of anaerobic technology. An Anaerobic membrane bioreactor (AnMBR) is a technology that applies membrane separation to traditional Anaerobic biological treatment processes. On the basis of the advantages of the anaerobic technology, the technology can realize complete biomass retention by utilizing the interception effect of the membrane (microfiltration/ultrafiltration membrane), solves the problem of sludge loss in the traditional anaerobic technology, and has the advantages of good effluent quality, strong impact resistance, small occupied area and the like. However, costly membrane modules add significantly to the investment and operating costs of anmbrs.
Anaerobic dynamic membrane bioreactor (AndBR) is an emerging technology that combines dynamic membrane with Anaerobic treatment and applies to activated sludge processes. Specifically, the technology which has the solid-liquid separation effect similar to that of an MF/UF membrane in AnMBR is realized by adopting a low-price large-aperture filter material to replace the traditional microfiltration/ultrafiltration membrane and utilizing an anaerobic dynamic membrane (sludge blanket) which is formed in situ or is formed again on the filter material at the initial stage of the filtering process as a separation medium. The coarse-pore filter material in the AnDMBR greatly saves the investment cost; the formed anaerobic dynamic membrane has smaller filtration resistance, and the cleaning mode is simple and easy, thereby obviously reducing the operation and maintenance cost of the sewage treatment process. AnDMBR adopting a large-aperture filter material with lower cost to replace a microfiltration/ultrafiltration membrane with high cost is more suitable for sewage treatment.
However, the inventor researches and discovers that: the AnDMBR still has the following defects: the formation of the anaerobic dynamic membrane is marked by two stages: the first stage is an anaerobic dynamic membrane forming stage, anaerobic activated sludge particles in the reactor are deposited on a large-aperture filter material to form a sludge layer, namely an anaerobic dynamic membrane, but the retention rate of particles and colloid in the anaerobic dynamic membrane forming stage is low, so that the AnDMBR has poor initial interception effect and low water yielding efficiency, and the accumulation rate of sludge floc is reported to be about 0-50g/(m & ltm & gt)2H) results in a longer dynamic film formation time, generally ranging from 30 minutes to several hours. And after the anaerobic dynamic membrane is formed, the anaerobic dynamic membrane enters a second stage, and finally, the anaerobic dynamic membrane is subjected to adsorption/deposition of anaerobic activated sludge particles and Extracellular Polymeric Substances (EPS) on the membrane component after continuously and stably running for a period of time, so that the thickness of the anaerobic dynamic membrane is increased, the pore diameter is reduced, the filtration resistance is increased, and membrane pores are blocked to cause membrane pollution. In addition, the anaerobic microorganisms have long generation period and slow proliferation speed, so that the sewage treatment efficiency of the AnDMBR is low.
Disclosure of Invention
Aiming at the problems, the invention provides a method for utilizing micron Fe3O4Strengthening the sewage treatment method of the anaerobic dynamic membrane bioreactor. The invention passes the micron Fe3O4The forming time of the anaerobic dynamic membrane is shortened, the formed anaerobic dynamic membrane is improved, and the aims of effectively controlling membrane pollution and improving the treatment effect are finally achieved. In order to achieve the purpose, the invention adopts the following technical means:
utilizing micron Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor comprises the following steps:
(1) magnetic anaerobic sludge formation stage: first do not comprise a filmMicron Fe is added into a closed anaerobic dynamic membrane bioreactor of the component3O4And anaerobic activated sludge with the grain diameter larger than micron Fe3O4(ii) a Then stirring to obtain micron Fe3O4And the magnetic anaerobic sludge is fully and uniformly mixed with the anaerobic activated sludge to form the magnetic anaerobic sludge.
(2) Magnetic anaerobic dynamic membrane formation stage (biofilm formation stage): and (3) placing a membrane component in the reactor for forming the magnetic anaerobic sludge, then introducing sewage into the reactor and continuously stirring, and entering the next stage after the magnetic anaerobic dynamic membrane is formed.
(3) Stable operation stage of the magnetic anaerobic dynamic membrane: and when the flux of the membrane module is reduced to a set value, finishing one operation period, taking out the membrane module for washing, and using the membrane module for circulation of the next period.
Further, the anaerobic dynamic membrane bioreactor comprises: the bioreactor is a double-layer structure consisting of an inner shell and an outer shell, a water bath area is formed between the inner shell and the outer shell, and the water bath area is in circulating connection with a constant-temperature medium supply device through a suction pump. The reaction zone formed by the inner shell is connected with a peristaltic pump for water inflow, and the reaction zone is provided with a stirrer to control the stirring speed of the anaerobic sludge mixed liquor in the reactor. The membrane module consists of a supporting structure and a filtering medium coated on the surface of the supporting structure. The water outlet pipe is connected with the membrane component, and a flowmeter is arranged on the water outlet pipe to determine the water outlet flux.
Optionally, the filter medium comprises any one of a non-woven fabric, a polyester mesh, a nylon mesh, a stainless steel mesh, and the like, preferably a polyester non-woven fabric. The support structure is cylindrical, and the material of the support structure can be PVC.
Optionally, the constant temperature medium supply device is a constant temperature water bath tank heated by an electric heating rod, and hot water is circularly added into the water bath area through a suction pump so as to control the temperature in the reactor to be constant. Optionally, between 20-30 deg.C.
Optionally, the bioreactor is made of plexiglass, forming a transparent shell to facilitate observation of the micro-Fe in the reactor3O4Mixing with anaerobic activated sludge, treating sewage, etc.
Further, the device also comprises a liquid level controller, wherein the detection end of the liquid level controller is positioned in the reaction zone, and the liquid level controller is connected with the peristaltic pump so as to control water inflow according to the change of the liquid level in the reactor.
Further, in the step (1), the micron Fe3O4The concentration of (A) is 0.2-0.8 g/L. Preferably 0.8g/L, and the COD and turbidity as detection indicators, under the concentration to the sewage treatment effect is better.
Further, in the step (1), the micron Fe3O4Fe having an average particle diameter of 2.70. + -. 0.01. mu.m, and a particle diameter in the micrometer range3O4The proportion of the Fe accounts for more than 98 percent of the total content, and the Fe is micron3O4Specific nano Fe3O4Is more stable.
Further, in the step (2), the turbidity of the effluent is less than 2NTU as a mark for forming the magnetic anaerobic dynamic membrane.
Further, in the step (2), constant-pressure gravity self-flowing water is adopted, and the water head difference is set to be 2.5-6.5cm, so that the pressure difference between two sides of the dynamic membrane is increased, and the membrane hanging time is shortened.
Further, in the step (3), the water head difference is adjusted to 2.5-3.0cm to prolong the stable operation period.
Micron Fe3O4The function in the sewage treatment of the invention is mainly three aspects: (1) micron Fe3O4And the inoculated sludge with larger grain diameter can form a magnetic anaerobic dynamic membrane with loose structure and uniform grains, so that the membrane has better filtering performance and low filtering resistance, thereby remarkably enhancing the stable operation time of the magnetic anaerobic dynamic membrane. (2) Adding micron Fe3O4Can reduce the content of Extracellular Polymeric Substance (EPS) in the activated sludge mixed liquor and reduce the filtration resistance of the membrane, thereby slowing down the membrane pollution of the anaerobic dynamic membrane. (3) In the anaerobic dynamic film formation stage, due to micron Fe3O4The flocculation can increase the particle size of anaerobic activated sludge flocs, improve the aggregation and shorten the anaerobic dynamic membraneThe formation time of (c). (4) Due to micron Fe3O4The anaerobic microorganism metabolism can be promoted, and the biodegradation function of the sludge layer on the anaerobic dynamic membrane is improved to a certain extent.
Compared with the prior art, the invention has the following beneficial effects:
(1) micron Fe3O4The flocculation effect of the method can improve the flocculation capacity of the anaerobic activated sludge, increase the particle size of sludge flocs and shorten the formation time of a magnetic anaerobic dynamic membrane by 10 min.
(2) Adding micron Fe3O4The membrane pollution of the anaerobic dynamic membrane layer is slowed down, the microorganisms in the anaerobic activated sludge mixed liquor are effectively inhibited from secreting less EPS, the filtration resistance of the anaerobic dynamic membrane is reduced, the flux is improved, and the filtration resistance increase rate of the formed magnetic anaerobic dynamic membrane is reduced by one order of magnitude.
(3) Adding micron Fe3O4Can promote metabolism of anaerobic microorganisms, and improve pollutant removal efficiency, and Fe3O4The average COD removal rate of the reinforced anaerobic dynamic membrane bioreactor is improved by 15 percent.
(4) Adding micron Fe3O4The biodegradation function of the anaerobic dynamic membrane can be enhanced, and the average COD removal rate of the magnetic anaerobic dynamic membrane is remarkably improved to 22 percent from 9 percent.
(5) Compared with the prior method of adopting Fe in AnMBR3O4The invention relates to a technology for modifying an ultrafiltration microfiltration membrane by using nano particles (for example, a patent document with the publication number of CN 108479429A), and Fe is adopted in the invention3O4Accelerating the formation of anaerobic dynamic membranes in AndBR is a completely different technique. Because AnMBR is greatly different from AnDMBR, the ultrafiltration microfiltration membrane of AnMBR can be deposited and attached with some sludge layers passively in the filtration process, but the formation process of the sludge layers is not desirable, and the sludge layers can block the microfiltration ultrafiltration membrane to cause the membrane pollution problem, so that Fe is adopted3O4Used as an adsorbent to slow down membrane fouling. However, since the AnDMBR is in the formation stage of anaerobic dynamic membrane (AnMBR does not have the process), anaerobic activity is realizedThe sexual sludge is gathered together and attached to the coarse-pore filter material to form a sludge layer, the sexual sludge can play a role of filtering similar to a microfiltration ultrafiltration membrane, pollutants in water are fully contacted with microorganisms in the sludge layer in the mass transfer process, the effective microorganism amount actually participating in pollutant degradation is far larger than that of the microfiltration ultrafiltration membrane, the formation process of the sludge layer is expected to happen, and the micron Fe is utilized in the invention3O4The flocculation shortens the formation time of the anaerobic dynamic membrane and accelerates the formation of the sludge layer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an anaerobic dynamic membrane bioreactor in an embodiment of the present invention.
The designations in the above figures represent respectively: 1-bioreactor, 2-membrane component, 3-inner shell, 4-outer shell, 5-water bath zone, 6-suction pump, 7-constant temperature medium supply device, 8-reaction zone, 9-peristaltic pump, 10-stirrer, 11-water outlet pipe, 12-flowmeter, 13-electric heating rod, 14-water inlet pipe, 15-liquid level controller, 16-micron Fe3O4H-head difference.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described above, some conventional AnDMBR still have the disadvantages of long anaerobic dynamic membrane formation time, short stable operation time, increased anaerobic dynamic membrane thickness in the later operation period, small pore diameter, increased filtration resistance, membrane pore blockage, membrane pollution and the like. Therefore, the invention provides a method for utilizing micron Fe3O4Strengthening the sewage treatment method of the anaerobic dynamic membrane bioreactor; the invention will now be further described with reference to the drawings and detailed description.
First embodiment
An anaerobic dynamic membrane bioreactor as shown in figure 1, comprising: bioreactor 1, membrane module 2. The bioreactor is a double-layer structure consisting of an inner shell 3 and an outer shell 4 made of organic glass materials, a water bath area 5 is formed between the inner shell and the outer shell, the water bath area 5 is in circulating connection with a constant temperature medium supply device 7 through a suction pump 6, the constant temperature medium supply device 7 is a constant temperature water bath box heated by an electric heating rod 13, and hot water is circularly added to the water bath area 5 through the suction pump 6 so as to control the temperature in the reactor to be constant at 25 +/-2 ℃.
A closed reaction area 8 formed by the inner shell is connected with a peristaltic pump 9 for water inflow through a water inlet pipe 14, a stirrer 10 is arranged in the reaction area 8, a rotating shaft of the stirrer 10 penetrates through the cylindrical membrane component to reach the bottom of the reactor, the stirring speed of anaerobic sludge mixed liquid in the reactor can be controlled through the stirrer 10, and the effective volume of the reaction area 8 is 3.8L.
The membrane component 2 is composed of a cylindrical support structure made of PVC material and polyester non-woven fabric coated on the surface of the cylindrical support structure, and the specification of the membrane component is 200g/m2Effective filtration area of 0.11m2. The upper part of the membrane component is provided with a water outlet which is connected with a water outlet pipe 11, a flowmeter 12 is arranged on the water outlet pipe, and the change of the water outlet flux is determined by measuring the change of the water outlet flow through the flowmeter. The detection end of the liquid level controller 15 is positioned in the reaction zone 8, and the liquid level controller 15 is connected with the peristaltic pump 9 so as to control water inflow according to the change of the liquid level in the reactor.
Second embodiment
Utilizing micron Fe3O4A sewage treatment method for strengthening anaerobic dynamic membrane bioreactor includes such steps as pre-testing to determine Fe micron3O4The optimal adding amount of the method comprises the following steps:
800mL of activated sludge mixed liquor (inoculated sludge is anaerobic activated sludge obtained from Qingdao municipal wastewater treatment plants, and MLSS is 4g/L) is added into each anaerobic bottle by adopting 4 identical anaerobic bottles. Then adding micron Fe with different mass into each anaerobic bottle3O4Making 4 anaerobic bottles contain Fe3O4Respectively setting the concentration of 0.2g/L, 0.4g/L, 0.6g/L and 0.8g/L, placing the anaerobic bottle in a shaking incubator for uniformly mixing, shaking for 20min at a shaking frequency of 120rpm, standing for precipitation for 30min, measuring COD and turbidity of the supernatant, and determining micron Fe3O4The optimum dosage of (2) is 0.8 g/L.
Third embodiment
Utilizing micron Fe3O4A method for treating sewage by using the anaerobic dynamic membrane bioreactor is disclosedThe bioreactor serves as a treatment site and the reaction temperature of the reactor is maintained between 25 + -2 deg.C throughout the treatment and through the water bath zone, specifically, comprising the steps of:
(1) magnetic anaerobic sludge formation stage: inoculating sludge (anaerobic activated sludge obtained from Qingdao municipal wastewater treatment plants, MLSS sludge is 4g/L) is added into a reaction zone of the reactor; then micron Fe is added into the reaction zone3O416 (average grain diameter is 2.70 +/-0.01 mu m, and the grain diameter is Fe in micron scale3O4Greater than 98% of the total content), micron Fe3O4The adding concentration is 0.8 g/L. The stirrer was adjusted to produce micron Fe at a rate of 150rpm3O4And the magnetic anaerobic sludge is fully and uniformly mixed with the anaerobic activated sludge to finally form the magnetic anaerobic sludge.
(2) Magnetic anaerobic dynamic membrane formation stage (biofilm formation stage): placing a membrane component 2 in a reactor for forming magnetic anaerobic sludge, starting the peristaltic pump, introducing simulated synthetic sewage into the reactor through a water inlet peristaltic pump, and feeding water C: n: p is 100: 5: 1, controlling the COD of inlet water to be about 300mg/L and the pH to be 6.8-7.2; the peristaltic pump of intaking is opened to the biggest (150rpm), adjusts the agitator and makes magnetism anaerobism mud be in suspension stirring state with 120rpm speed, adopts constant voltage gravity to flow out water automatically, and the head difference sets up to 6.0cm to increase the pressure differential of dynamic membrane both sides, shorten the biofilm formation time, and the sign that goes out the water turbidity and is less than 2NTU as magnetism anaerobism dynamic membrane formation. In the stage, except for sampling, in order to ensure the proliferation and growth of the anaerobic microorganisms with long generation period, no sludge is discharged in the whole stage, and the sludge age is nearly infinite.
(3) Stable operation stage of the magnetic anaerobic dynamic membrane: after the magnetic anaerobic dynamic membrane is formed, entering a stable operation stage, adjusting a water inlet peristaltic pump to 20rpm, adjusting a water head difference h to 2.5cm so as to prolong a stable operation period, controlling water inlet through a liquid level controller, enabling the magnetic anaerobic sludge to be in a suspension stirring state by a stirrer at a speed of 60rpm, keeping the effluent flux and turbidity to be relatively stable, keeping the pH of the sewage at 6.8-7.2, and when the flux is reduced to 10L/m2Below h, one run cycle ends.
Fourth embodiment
For comparison of the third example, an anaerobic dynamic membrane bioreactor was used as the treatment site and the reaction temperature of the reactor was maintained between 25. + -. 2 ℃ throughout the treatment and through the water bath zone, with the difference that no micron Fe was added to the reactor3O4. Specifically, the method comprises the following steps:
(1) anaerobic dynamic membrane formation stage (biofilm formation stage): inoculating sludge is added into a reactor, a water inlet peristaltic pump is started, then simulated synthetic sewage (C: N: P is 100: 5: 1, COD is controlled to be about 300mg/L, pH is 6.8-7.2) is introduced into the reactor through the water inlet peristaltic pump, the water inlet peristaltic pump is started to 150rpm, a magnetic stirrer is adjusted to enable anaerobic activated sludge to be in a suspension stirring state at the speed of 120rpm, constant-pressure gravity self-flow water is adopted, the water head difference is set to be 6.0cm, the pressure difference between two sides of a dynamic membrane is increased, the membrane hanging time is shortened, and the anaerobic dynamic membrane is completed on a membrane component when the effluent turbidity is less than 2 NTU.
(2) And (3) stable operation stage of the anaerobic dynamic membrane: after the anaerobic dynamic membrane is formed, entering a stable operation stage, adjusting a water inlet peristaltic pump to 20rpm, adjusting the water head difference to 2.5cm so as to prolong the stable operation period, controlling water inlet through a liquid level controller, enabling anaerobic sludge to be in a suspension stirring state by a stirrer at the speed of 60rpm, enabling the water outlet flux and turbidity to be relatively stable, and when the flux is reduced to 10L/m2Below h, one run cycle ends. Except for sampling, in order to ensure the proliferation and growth of the anaerobic microorganisms with long generation period, no sludge is discharged in the whole period, and the sludge age is close to infinite.
Effect testing
For the fourth example, the formation time of the anaerobic dynamic membrane in the biofilm formation stage was 20 min. the increase rate of the filtration resistance of the anaerobic dynamic membrane during 10d of the steady operation period was 2.16 × 108m-1h-1. The stable running time of the anaerobic dynamic membrane is 10 days, and the flux is maintained at 10-20L/m2H or so. The average grain diameter of the anaerobic activated sludge is 50.7 mu m, and the average grain diameter of the anaerobic dynamic membrane layer is 63.1 mu m. The treated effluent performance indexes are as follows: the COD effluent concentration is 60.6 +/-3.8 mg/L, the average COD removal efficiency is 79.8 percent, and the supernatant liquid is concentrated in CODThe degree is 87.6 +/-4.2 mg/L, and the average COD removal efficiency of the anaerobic dynamic membrane is 9 percent. In addition, the content of soluble microbial metabolites (SMP) of the anaerobic activated sludge mixed liquor is 45.5mg/g MLSS, and the content of Extracellular Polymeric Substances (EPS) is 61.6mg/g MLSS.
For the third embodiment: in the film forming stage, the formation time of the magnetic anaerobic dynamic film is 10min, and micron Fe is not added3O410min is shortened, the filtration resistance increase rate of the magnetic anaerobic dynamic membrane in 10d during the stable operation is 7.6 × 107m-1h-1I.e., the filtration resistance increase rate is reduced by an order of magnitude from before, indicating that the filtration resistance increase is significantly slowed. The stable running time of the anaerobic dynamic membrane is 15 days, and the flux is maintained at 20-35L/m2H or so. The average grain diameter of the magnetic anaerobic activated sludge is 60.6 mu m, and the average grain diameter of the magnetic anaerobic dynamic film layer is 68.5 mu m. The effluent performance indexes after treatment are as follows: the COD outlet water concentration is 13.8 +/-2.7 mg/L, the average COD removal efficiency is 95.4 percent, the supernatant COD concentration is 79.8 +/-2.4 mg/L, and the average COD removal efficiency of the anaerobic dynamic membrane is 22 percent. It can be seen that: micron Fe3O4The addition of the magnetic anaerobic dynamic membrane improves the sewage treatment performance of the AnDMBR and increases the pollutant treatment capacity of the magnetic anaerobic dynamic membrane. In addition, the content of soluble microorganism metabolite (SMP) of the anaerobic activated sludge mixed liquor is 38.5mg/g MLSS, the content of Extracellular Polymer (EPS) is 53.3mg/g MLSS, and micron Fe is added3O4The addition of (2) reduces the content of SMP and EPS and slows down the membrane pollution of the anaerobic dynamic membrane.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Utilizing micron Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized by comprising the following steps:
(1) magnetic anaerobic sludge formation stage: firstly, micron Fe is added into a closed anaerobic dynamic membrane bioreactor without a membrane component3O4And anaerobic activated sludge with the grain diameter larger than micron Fe3O4(ii) a Then stirring to obtain micron Fe3O4Fully and uniformly mixing the magnetic anaerobic sludge with the anaerobic activated sludge to form magnetic anaerobic sludge;
(2) magnetic anaerobic dynamic membrane forming stage: placing a membrane component in a reactor for forming the magnetic anaerobic sludge, then introducing sewage into the reactor and continuously stirring, and entering the next stage after the magnetic anaerobic dynamic membrane is formed;
(3) stable operation stage of the magnetic anaerobic dynamic membrane: and when the flux of the membrane module is reduced to a set value, finishing one operation period.
2. The method of claim 1 utilizing micro-Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that in the step (1), the micron Fe is treated3O4The concentration of (A) is 0.2-0.8 g/L; preferably 0.8 g/L.
3. The method of claim 1 utilizing micro-Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that in the step (1), the micron Fe is treated3O4Has an average particle diameter of 2.70 +/-0.01 mu m and Fe in a micron scale3O4The proportion of the total content is more than 98 percent.
4. The method of claim 1 utilizing micro-Fe3O4The sewage treatment method of the enhanced anaerobic dynamic membrane bioreactor is characterized in that in the step (2), the effluent turbidity less than 2NTU is used as a mark for forming the magnetic anaerobic dynamic membrane.
5. The method of claim 1 utilizing micro-Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that in the step (2), constant-pressure gravity self-flow water is adopted, and the water head difference is set to be 2.5-6.5 cm.
6. The method of claim 1 utilizing micro-Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that in the step (3), the water head difference is adjusted to be 2.5-3.0 cm.
7. The method of any one of claims 1-6 utilizing micro-Fe3O4A method for treating sewage by using an enhanced anaerobic dynamic membrane bioreactor, comprising: the bioreactor is a double-layer structure consisting of an inner shell and an outer shell, a water bath area is formed between the inner shell and the outer shell, and the water bath area is in circulating connection with a constant-temperature medium supply device through a suction pump; a reaction zone formed by the inner shell is connected with a peristaltic pump for water inlet, and the reaction zone is provided with a stirrer; the membrane component consists of a supporting structure and a filtering medium coated on the surface of the supporting structure; the water outlet pipe is connected with the membrane component, and a flowmeter is arranged on the water outlet pipe.
8. The method of claim 7 utilizing micron Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that the filter medium comprises any one of non-woven fabrics, polyester nets, nylon nets and stainless steel nets, and polyester non-woven fabrics are preferred;
or; the supporting structure is cylindrical, and the material of the supporting structure can be PVC;
alternatively, the bioreactor is made of plexiglass.
9. The method of claim 7 utilizing micron Fe3O4The sewage treatment method of the reinforced anaerobic dynamic membrane bioreactor is characterized in that the constant temperature medium supply device is a constant temperature water bath box heated by an electric heating rod.
10. The method of claim 7 utilizing micron Fe3O4Reinforced anaerobic dynamic membrane bioreactorThe sewage treatment method is characterized by further comprising a liquid level controller, wherein the detection end of the liquid level controller is positioned in the reaction zone, and the liquid level controller is connected with the peristaltic pump.
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| CN114262053A (en) * | 2022-01-17 | 2022-04-01 | 西安建筑科技大学 | Efficiency enhanced regulation and control method for anaerobic dynamic membrane fermentation system |
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