CN111875047A - Wastewater treatment system and wastewater treatment process - Google Patents
Wastewater treatment system and wastewater treatment process Download PDFInfo
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- CN111875047A CN111875047A CN202010700533.6A CN202010700533A CN111875047A CN 111875047 A CN111875047 A CN 111875047A CN 202010700533 A CN202010700533 A CN 202010700533A CN 111875047 A CN111875047 A CN 111875047A
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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
- C02F3/2866—Particular arrangements for anaerobic reactors
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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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Abstract
The invention discloses a wastewater treatment system and a wastewater treatment process, wherein the wastewater treatment system comprises: an anaerobic reactor for containing anaerobic microorganisms; a membrane separator; the marsh gas circulation pipeline, marsh gas circulation pipeline includes: the device comprises a main pipeline, a first stirring branch, a second stirring branch and a circulating branch; one end of the main pipeline is communicated with a methane outlet of the anaerobic reactor, and the other end of the main pipeline is respectively communicated with inlets of the first stirring branch and the second stirring branch; the outlet of the first stirring branch is communicated with a first biogas inlet of the anaerobic reactor, and the outlet of the second stirring branch is communicated with a biogas inlet of the membrane separator; and two ends of the circulating branch are respectively communicated with a methane outlet of the membrane separator and a second methane inlet of the anaerobic reactor. The invention can utilize the methane circulation as the power for mixing the muddy water, thereby ensuring that the muddy water in the anaerobic reactor is fully mixed and contacted.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system and a wastewater treatment process.
Background
The combination of anaerobic and membrane processes is a new trend in the development of wastewater treatment processes in recent years. Because the solid-liquid separation is the basis of existence of the high-efficiency anaerobic bioreactor, the solid-liquid separation effect of the system can be obviously improved by adopting the membrane biological treatment process. The combination mode exerts the advantages of the two processes to the maximum extent. The anaerobic process is combined with the membrane technology to be an ideal method, the anaerobic process can generate energy to a certain extent and can meet the requirement of the treatment process on temperature, and the generated sludge amount is small; the membrane separation technology can enable methane bacteria with longer generation time to survive in the anaerobic reaction, thereby effectively degrading pollutants in the organic wastewater and improving the treatment efficiency. How to effectively maintain the anaerobic activated sludge with excellent performance in the reactor, and make the sludge fully mixed and contacted with a water inlet substrate, and furthest utilize the treatment capacity of microorganisms is the direction for developing the anaerobic reactor.
For high concentration organic matter, anaerobic biological treatment technology is preferred as the main means for removing organic matter, but effluent COD tends to be higher if only anaerobic biological treatment technology is used.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a wastewater treatment system and a wastewater treatment process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an embodiment of the present invention provides a wastewater treatment system, including:
an anaerobic reactor for containing anaerobic microorganisms;
a membrane separator; and
the marsh gas circulation pipeline, marsh gas circulation pipeline includes: the device comprises a main pipeline, a first stirring branch, a second stirring branch and a circulating branch;
one end of the main pipeline is communicated with a methane outlet of the anaerobic reactor, and the other end of the main pipeline is respectively communicated with inlets of the first stirring branch and the second stirring branch;
the outlet of the first stirring branch is communicated with a first biogas inlet of the anaerobic reactor, and the outlet of the second stirring branch is communicated with a biogas inlet of the membrane separator;
and two ends of the circulating branch are respectively communicated with a methane outlet of the membrane separator and a second methane inlet of the anaerobic reactor.
Further, the wastewater treatment system further comprises: and one end of the water return pipeline is communicated with the membrane separator, and the other end of the water return pipeline is communicated with the water inlet of the anaerobic reactor.
Further, the wastewater treatment system further comprises: and two ends of the mud-water mixing pipeline are respectively communicated with the anaerobic processor and the membrane separator.
Further, the wastewater treatment system further comprises: and the fan is arranged on the main pipeline.
Further, the membrane separator includes:
a housing; and
a membrane assembly located within the housing.
Further, the wastewater treatment system further comprises:
and the water inlet pipeline is communicated with the membrane separator or communicated with the water return pipeline.
Further, the wastewater treatment system further comprises: a drain line in communication with the membrane separator.
Further, the drainage pipeline is a negative pressure drainage pipeline.
Further, the wastewater treatment system further comprises: an exhaust line in communication with the circulation branch.
Further, the wastewater treatment system further comprises: and the air supplementing valve is arranged on the methane circulating pipeline.
The embodiment of the present invention further provides a wastewater treatment process of the wastewater treatment system according to any one of the above embodiments, including:
after the biogas in the anaerobic reactor is introduced into the main pipeline, the biogas enters the membrane separator from the first stirring branch to be stirred; and the biogas is also introduced into the anaerobic reactor from the second stirring branch for stirring the biogas;
and introducing the biogas in the membrane separator into at least the anaerobic reactor through the circulating branch.
The embodiment of the invention provides a wastewater treatment system and a wastewater treatment process, which can combine an anaerobic process with a membrane technology and improve the treatment effect on wastewater. The biogas circulation is used as the power for mixing the muddy water, thereby ensuring that the muddy water in the anaerobic reactor is fully mixed and contacted. The large bubbles generated by biogas aeration promote the biogas bubbles generated by anaerobic microorganisms to be driven and coalesced, so that the biogas is convenient to separate from mud and water. Moreover, the turbulent flow condition formed by aeration of the methane ensures good mixing of mud and water on one hand, and also shears the sludge to finely disperse the sludge on the other hand, thereby increasing the specific surface area of the sludge, accelerating the mass transfer rate and laying a foundation for improving the load and shortening the retention time.
Drawings
FIG. 1 is a schematic diagram of an alternative wastewater treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative wastewater treatment system according to an embodiment of the present invention.
Reference numerals:
an anaerobic reactor 10; a membrane separator 20; a housing 21; a membrane module 22; a liquid seal device 30; a container 31; a liquid 32; an outlet pipe 33; a first stirring branch 42; a second stirring branch 43; a fan 50; a main line 50; a water inlet line 61; a return line 62; a collection tank 63; a circulation branch 71; an exhaust line 72; a muddy water mixing line 80; a drain line 90; a clean water tank 91.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, belong to the scope of protection of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, if any, are used in an orientation or positional relationship based on that shown in fig. 1 and 2, only for the convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Generally, the research of anaerobic membrane biological reaction technology has three main forms:
the integrated anaerobic membrane bioreactor of the UASB and the EGSB + membrane component continues the sludge granulation technology of the UASB and the EGSB, utilizes granular sludge to improve solid-liquid separation efficiency, maintain high-concentration biomass in the reactor, and increase the effectiveness of solid-liquid-gas three-phase separation, and the effluent of the membrane component creates conditions for further improving solid-liquid separation efficiency and maintaining high-concentration anaerobic sludge. However, the aggregation of granular sludge or sludge in a sludge bed is good, which has an adverse effect on the mass transfer process, and may cause the sewage treatment to require a long retention time and a low reaction rate. The removal rate of COD is increased along with the extension of the hydraulic retention time, and the stability of the treatment effect is improved by the good interception effect of the membrane; methane production increases linearly with increasing volumetric load; the specific flux of the membrane is attenuated quickly, and the membrane is cleaned frequently by water power; the membrane cleaning time interval decreases linearly with small hydraulic residence time.
And the other is an integral anaerobic membrane bioreactor adopting methane stirring, which adopts a completely mixed anaerobic reactor mode of stirring by methane, and arranges the membrane component in the anaerobic reactor, although the membrane component has good mixed contact condition and improves the sludge dispersion degree, because the membrane component is arranged in the anaerobic reactor, the cleaning of the membrane component becomes difficult or the anaerobic condition of the anaerobic reactor is destroyed during cleaning.
Thirdly, the existing split aerobic membrane bioreactor is adopted, the form of water outlet of the anaerobic reactor and the positive pressure membrane module is adopted, and the structural form of the anaerobic reactor still mainly takes UASB, EGSB, AF and the like.
Comprehensively considering, the anaerobic biological treatment has good treatment effect on the high-concentration organic wastewater, not only has high efficiency and low energy consumption, but also can recover a large amount of biological energy, so the anaerobic biological treatment technology is preferentially adopted for the high-concentration organic wastewater. Membrane bioreactors have been developed based on the combination of traditional biological treatment processes and membrane separation technologies, with many advantages not comparable to other biological treatment technologies alone.
As shown in fig. 1 and 2, wherein the direction of the arrows in fig. 1 and 2 represent the flow direction of the respective media in the respective pipes. The medium includes a gas, a liquid, a solid-liquid mixture, or the like.
An embodiment of the present invention provides a wastewater treatment system, including: anaerobic reactor 10, membrane separator 20 and biogas circulation line. Wherein, anaerobic reactor 10 is used for holding anaerobic microorganism, and marsh gas circulation line includes: main line 50, first stirring branch 42, second stirring branch 43 and circulation branch 71.
Wherein, one end of the main pipeline 50 is communicated with the biogas outlet of the anaerobic reactor 10, and the other end is respectively communicated with the inlets of the first stirring branch 42 and the second stirring branch 43; the outlet of the first stirring branch 42 is communicated with the first biogas inlet of the anaerobic reactor 10, and the outlet of the second stirring branch 43 is communicated with the biogas inlet of the membrane separator 20; two ends of the circulating branch 71 are respectively communicated with a methane outlet of the membrane separator 20 and a second methane inlet of the anaerobic reactor 10.
The embodiment of the invention is a split anaerobic membrane biological treatment process developed on the basis of an aerobic membrane bioreactor, the solid-liquid separation effect of the system can be obviously improved by adopting a membrane filtration process, and the mixing effect of anaerobic sludge and sewage can be improved by circularly stirring gas by using anaerobic generated gas.
In particular, the anaerobic process can be combined with the membrane technology to improve the treatment effect on the wastewater. The marsh gas generated by the whole system can be circulated through a marsh gas circulating pipeline. The biogas circulation is used as the power for mixing the muddy water, so that the muddy water in the anaerobic reactor 10 is fully mixed and contacted. The large bubbles generated by biogas aeration promote the biogas bubbles generated by anaerobic microorganisms to be driven and coalesced, so that the biogas is convenient to separate from mud and water. Moreover, the turbulent flow condition formed by aeration of the methane ensures good mixing of mud and water on one hand, and also shears the sludge to finely disperse the sludge on the other hand, thereby increasing the specific surface area of the sludge, accelerating the mass transfer rate and laying a foundation for improving the load and shortening the retention time.
The anaerobic reactor 10 and the membrane separator 20 are both in the form of fully mixed closed reactors. The closed reactor can well maintain the anaerobic environment; the membrane separator 20 can realize solid-liquid separation, and the methane stirring can improve the solid-liquid separation performance of the membrane separator 20, and the good solid-liquid separation performance creates conditions for maintaining high sludge concentration in the anaerobic reactor 10.
In some embodiments of the invention, the wastewater treatment system further comprises: and a water return pipeline 62, wherein one end of the water return pipeline 62 is communicated with the membrane separator 20, and the other end is communicated with the water inlet of the anaerobic reactor 10.
The return pipe 62 can return the mixed liquid portion in the membrane separator 20 to the anaerobic reactor 10 to maintain a higher sludge concentration in the anaerobic reactor 10, so as to ensure the concentration of anaerobic microorganisms in the anaerobic reactor 10 and ensure the treatment effect of the anaerobic reactor 10 on raw water.
Further, the water return line 62, in combination with the above-described muddy water mixing line 80, realizes circulation of the liquid in the anaerobic reactor 10 and the membrane separator 20.
Typically, the mixed liquor in the membrane separator 20 is pumped back to the anaerobic reactor 10 by a lift pump.
The return pipe 62 combines the biogas circulation pipe to realize the power of mixing the muddy water by the backflow of the mixed liquid and the biogas circulation. Further ensuring that the muddy water in the anaerobic reactor 10 is fully mixed and contacted. Wherein, the mud-water mixed liquid automatically flows into the membrane separator 20, and the inside of the membrane separator 20 adopts the methane for circular aeration to form higher cross flow velocity, thus slowing down the pollution of the membrane separator 20 and promoting the mud-water separation. The turbulent condition formed by the mixed liquid reflux and the biogas aeration circulation further improves the good mixing of the mud and water, further improves the shearing of the sludge, finely disperses the sludge, increases the specific surface area of the sludge, accelerates the mass transfer rate, and lays a foundation for improving the load and shortening the retention time.
In the embodiment of the invention, the combination of biogas stirring and mixed liquid reflux is adopted, so that good mixing conditions and high turbulence degree are formed in the anaerobic reactor 10, sludge is fully dispersed, the mass transfer rate is improved, and the treatment process can be accelerated. Moreover, the turbulence formed by the aeration of the biogas can enable the gases generated by the anaerobic microorganisms to be mutually combined, the separation efficiency of mud water and gas in the anaerobic reactor 10 can be improved, and the membrane module 22 can well separate the mud water, so that the problem of gas-liquid-solid three-phase separation of the system is solved.
In some embodiments of the invention, the wastewater treatment system further comprises: and the two ends of the mud-water mixing pipeline 80 are respectively communicated with the anaerobic reactor 10 and the membrane separator 20.
As shown in fig. 1 and 2, the muddy water mixed solution in the anaerobic reactor 10 flows into the membrane separator 20 through the muddy water mixing line 80. The mixed liquor flowing into the membrane separator 20 is further purified.
In some embodiments of the invention, the wastewater treatment system further comprises: and a fan 50 disposed on the main duct 50.
As shown in fig. 1, the blower 50 is an explosion-proof biogas blower 50, and the blower 50 pressurizes biogas from the anaerobic reactor 10 and divides the pressurized biogas into two paths, which enter the anaerobic reactor 10 and the membrane separator 20 respectively for biogas stirring. It is to be understood that the biogas from the anaerobic reactor 10 is not limited to the biogas produced in the anaerobic reactor 10, and may be biogas produced by the entire reaction system.
In some embodiments of the invention, the membrane separator 20 comprises: a housing 21 and a membrane module 22, the membrane module 22 being located within the housing 21.
As shown in fig. 1 and 2, the membrane separator 20 and the anaerobic reactor 10 according to the embodiment of the present invention are separated, and this structure can reduce the contamination of the membrane separator 20 and improve the solid-liquid separation effect.
The membrane module 22 is a microfiltration membrane module 22, and is located in the housing 21, and the sludge-water mixed liquid entering the membrane separator 20 is filtered by the microfiltration membrane module 22 to obtain treated clean water.
In some embodiments of the invention, the wastewater treatment system further comprises: and the water inlet pipeline 61 is communicated with the membrane separator 20 or communicated with the water return pipeline 62.
The water inlet line 61 may be directly connected to the water return line 62, or may be connected to the water return line 62 via the membrane separator 20. So that the raw water and the mixed liquid refluxed in the membrane separator 20 enter the anaerobic reactor 10 together.
Raw water to be treated enters a wastewater treatment system through a water inlet pipeline 61 for purification treatment.
Further, the wastewater treatment system further comprises: and the collecting tank 63 is used for collecting raw water in the collecting tank 63, and the water inlet pipeline 61 is communicated with the collecting tank 63.
In some embodiments of the invention, the wastewater treatment system further comprises: a drain line 90, the drain line 90 communicating with the membrane separator 20.
As shown in fig. 1 and 2, after being separated and filtered by the membrane separator 20, clean water meeting the requirements is formed, and the clean water is discharged out of the membrane separator 20 through a water discharge pipeline 90.
Further, the wastewater treatment system further comprises: the clean water tank 91, and the water outlet of the drainage pipeline 90 is communicated with the clean water tank 91.
In some embodiments of the invention, drain line 90 is a negative pressure drain line.
The membrane separator 20 adopts a negative pressure water outlet mode, and at least can improve the drainage efficiency.
In some embodiments of the invention, the wastewater treatment system further comprises: the exhaust line 72 communicates with the circulation branch 71.
As shown in fig. 1 and 2, the exhaust line 72 is used to remove excess biogas from the wastewater treatment system. Thus, the exhaust line 72 can be in direct communication with the anaerobic reactor 10 in addition to the circulation branch 71.
Further, the wastewater treatment system further comprises: liquid seal device 30, liquid seal device 30 includes: the container 31, the air outlet pipe 33 and the liquid 32 such as water in the container 31, wherein the outlet of the air outlet pipe 33 faces the outside of the container 31, and the inlet is positioned in the container 31 and above the liquid level of the liquid 32. The exhaust line outlet is inserted into the liquid 32.
Generally, the gas is located above, and for easier venting, the inlet of the exhaust line is located above. As shown in fig. 1 and 2, the separated gaseous components enter the top north of the anaerobic reactor 10 to be collected as a gas source for stirring the biogas, and the excess biogas is discharged after being sealed by water.
In some embodiments of the invention, the wastewater treatment system further comprises: the aeration valve is arranged on the methane circulating pipeline.
Because the whole wastewater treatment system is a closed system and the mixing measure mainly adopts the methane stirring measure, the stirring lacks a gas source because no methane is generated in the starting stage of the anaerobic reactor 10. And intermittently supplying air to the wastewater treatment system by arranging an air supply valve on the methane pipeline to maintain mud-water mixing. The source, mode and duration of the aeration may affect the anaerobic reactor 10.
In conclusion, the embodiment of the invention adopts the methane stirring and the hydraulic circulation to realize the effect of completely mixing the mud and the water, so that the sludge is more dispersed to improve the mass transfer efficiency, and further the load of the whole reactor is improved. In the process of negative pressure water outlet, the anaerobic reactor 10 adopts mixed liquid reflux and methane stirring to fully disperse sludge and accelerate mass transfer, the split type membrane component 22 also adopts methane aeration, an aeration valve is additionally arranged on a methane circulating pipeline, and circulating gas is supplemented into the system at the initial stage of starting to generate no gas so as to accelerate the starting of the anaerobic reactor 10.
Furthermore, the embodiment of the invention aims at the treatment load of the organic wastewater to reach 10kgCOD/m3D, the removal efficiency of COD reaches more than 95 percent; for the high-concentration organic wastewater which is easy to biodegrade, the COD concentration of the effluent is controlled below 500 mg/L. The mixed liquid improves the mixing effect and the gas-water separation effect through the methane stirring and the hydraulic circulation. The membrane module 22 can be operated more stably for a longer time under the optimal water outlet effect by controlling the water flow rate, the sludge concentration, the working pressure, the membrane cleaning aeration amount, the hydraulic cleaning, the chemical cleaning period and the dosage. By adjusting the operating control conditions andand a large amount of anaerobic digestion sludge is inoculated, so that the starting time of the reactor can be shortened.
The embodiment of the invention also provides a wastewater treatment process of the wastewater treatment system in any one of the embodiments, which comprises the following steps:
step S10, after the biogas in the anaerobic reactor 10 is introduced into the main pipeline 50, the biogas enters the membrane separator 20 from the first stirring branch 42, and is stirred; and the biogas is also introduced into the anaerobic reactor 10 from the second stirring branch 43 for stirring the biogas;
step S20, the biogas in the membrane separator 20 is at least introduced into the anaerobic reactor 10 through the circulation branch 71.
Since the wastewater treatment system has the above-described advantageous effects, the wastewater treatment process for the wastewater treatment system also has the above-described advantageous effects. For example: the combination of biogas stirring and mixed liquor backflow is adopted to form good mixing conditions and high turbulence degree in the anaerobic reactor 10, so that the sludge is fully dispersed, the mass transfer rate is improved, and the treatment process can be accelerated. Moreover, the turbulence formed by the aeration of the biogas can enable the gases generated by the anaerobic microorganisms to be mutually combined, the separation efficiency of mud water and gas in the anaerobic reactor 10 can be improved, and the membrane module 22 can well separate the mud water, so that the problem of gas-liquid-solid three-phase separation of the system is solved.
In some embodiments of the invention, the wastewater treatment process further comprises: the mixed liquid in the anaerobic reactor 10 is passed through the mud-water mixing pipeline 80 and is further treated in the membrane separator 20.
The membrane separator 20 further separates and purifies the mixed liquid.
In some embodiments of the invention, the wastewater treatment process further comprises: the mud-water mixed liquid in the membrane separator 20 is returned to the anaerobic treatment device 10 through the return line 62.
The return line 62, in combination with the above-described sludge-water mixing line 80, realizes circulation of the liquid 32 in the anaerobic reactor 10 and the membrane separator 20, and water circulation.
The returned muddy water mixed liquor has a stirring effect, promotes the muddy water in the anaerobic reactor 10 to be fully mixed and contacted, and also ensures the amount of sludge and anaerobic microorganisms in the anaerobic reactor 10.
Moreover, the condition of turbulent flow formed by the circulation of mixed liquid reflux and biogas aeration further improves the good mixing of mud and water, further improves the shearing of sludge, finely disperses the sludge, increases the specific surface area of the sludge, accelerates the mass transfer rate, and lays a foundation for improving the load and shortening the retention time.
In a specific example, raw water is lifted by a pump and enters the anaerobic reactor 10 together with the reflux mixed liquid circulated by the membrane separator 20, the reactor is completely sealed, a strict anaerobic environment is kept, and the anti-explosion biogas fan 50 pressurizes biogas generated by the reaction system and divides the biogas into two paths, and the two paths of biogas enter the anaerobic reactor 10 and the membrane separator 20 respectively to be stirred. The sludge and water are fully mixed due to the action of the backflow mixed liquid and the methane stirring in the anaerobic reactor 10, anaerobic microorganisms degrade substrates in raw water under a proper environmental condition, generated carbon dioxide, hydrogen, methane, hydrogen sulfide and the like form micro bubbles, the micro bubbles collide with each other and are combined into large bubbles under the action of turbulence, the separation of the large bubbles from the sludge and water is facilitated, separated gaseous components enter the top north of the reactor and are collected into a methane stirring air source, and redundant methane is discharged after water sealing. The muddy water mixed liquid after gas separation automatically flows into the membrane separator 20, a microfiltration membrane component 22 is arranged in the membrane separator 20, and under the action of a vacuum pump, water in the mixed liquid passes through the microfiltration membrane and then enters the other side of the membrane component 22 to become effluent, and then enters the clean water tank 91. The membrane separator 20 still uses biogas agitation, and the main purpose is to form a high cross flow velocity on the surface of the microfiltration membrane component 22 to prevent the formation of a filter cake layer, thereby slowing down the generation of pollution of the membrane component 22, and the circulated biogas is also collected as a biogas source for biogas circulation. The mixed liquor in the membrane separator 20 is raised by the reflux pump and then returned to the anaerobic reactor 10 to maintain a higher sludge concentration in the anaerobic reactor 10. The anaerobic reactor 10 and the membrane module 22 are organically combined, so that the capacity of treating organic matters is outstanding.
In embodiments of the present invention, the various features of the wastewater treatment system may be combined with one another without conflict. Various features in the wastewater treatment process may be combined with one another. The various technical features of the wastewater treatment system and the wastewater treatment process may also be combined with each other.
Other structures and operations of the wastewater treatment system according to the embodiment of the present invention will be understood and readily implemented by those skilled in the art, and thus will not be described in detail.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A wastewater treatment system, comprising:
an anaerobic reactor for containing anaerobic microorganisms;
a membrane separator; and
the marsh gas circulation pipeline, marsh gas circulation pipeline includes: the device comprises a main pipeline, a first stirring branch, a second stirring branch and a circulating branch;
one end of the main pipeline is communicated with a methane outlet of the anaerobic reactor, and the other end of the main pipeline is respectively communicated with inlets of the first stirring branch and the second stirring branch;
the outlet of the first stirring branch is communicated with a first biogas inlet of the anaerobic reactor, and the outlet of the second stirring branch is communicated with a biogas inlet of the membrane separator;
and two ends of the circulating branch are respectively communicated with a methane outlet of the membrane separator and a second methane inlet of the anaerobic reactor.
2. The wastewater treatment system of claim 1, further comprising: and one end of the water return pipeline is communicated with the membrane separator, and the other end of the water return pipeline is communicated with the water inlet of the anaerobic reactor.
3. The wastewater treatment system of claim 1, further comprising: and two ends of the mud-water mixing pipeline are respectively communicated with the anaerobic processor and the membrane separator.
4. The wastewater treatment system of claim 1, further comprising: and the fan is arranged on the main pipeline.
5. The wastewater treatment system of claim 1, wherein the membrane separator comprises:
a housing; and
a membrane assembly located within the housing.
6. The wastewater treatment system of claim 2, further comprising:
and the water inlet pipeline is communicated with the membrane separator or communicated with the water return pipeline.
7. The wastewater treatment system of claim 1, further comprising: a drain line in communication with the membrane separator; and/or
The drainage pipeline is a negative pressure drainage pipeline.
8. The wastewater treatment system of claim 1, further comprising: an exhaust line in communication with the circulation branch.
9. The wastewater treatment system of claim 1, further comprising: and the air supplementing valve is arranged on the methane circulating pipeline.
10. A process for treating wastewater in a wastewater treatment system according to any of claims 1 to 9, comprising:
after the biogas in the anaerobic reactor is introduced into the main pipeline, the biogas enters the membrane separator from the first stirring branch to be stirred; and the biogas is also introduced into the anaerobic reactor from the second stirring branch for stirring the biogas;
and introducing the biogas in the membrane separator into at least the anaerobic reactor through the circulating branch.
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| CN106673190A (en) * | 2016-12-22 | 2017-05-17 | 常州大学 | Waste water efficient anaerobic treatment process and device |
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| JP2006007221A (en) * | 2005-09-16 | 2006-01-12 | Toshiba Corp | Anaerobic water treatment apparatus |
| CN103588297A (en) * | 2013-11-26 | 2014-02-19 | 苏州思源环保工程有限公司 | Waste water treatment method and anaerobic membrane bioreactor for realizing method |
| CN203602453U (en) * | 2013-11-26 | 2014-05-21 | 苏州思源环保工程有限公司 | Anaerobic meane biological reactor |
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Application publication date: 20201103 |
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