CN214218311U - Black film methane tank and culture wastewater treatment system comprising same - Google Patents
Black film methane tank and culture wastewater treatment system comprising same Download PDFInfo
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- CN214218311U CN214218311U CN202022710523.9U CN202022710523U CN214218311U CN 214218311 U CN214218311 U CN 214218311U CN 202022710523 U CN202022710523 U CN 202022710523U CN 214218311 U CN214218311 U CN 214218311U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The utility model provides a black film methane tank and a culture wastewater treatment system comprising the same, wherein the black film methane tank comprises a pit foundation, geotextile, a lower layer black film, an upper layer black film, an air guide channel, an air guide pipe and a blind pipe; wherein, the lower layer black film is laid on the geotextile; the upper layer black film is laid on the lower layer black film, and a closed space is formed between the upper layer black film and the lower layer black film after the edges of the upper layer black film and the lower layer black film are fixed for accommodating fermented substances; the gas guide channel is suspended in the object to be fermented and used for supporting and diffusing the methane to the gas guide tube; the air guide pipes are arranged on the periphery of the upper edge of the pit foundation; one end of the blind pipe is arranged at the bottom of the pit foundation and is positioned below the geotextile, and the other end of the blind pipe is led to the outside of the pit foundation along the pit foundation. The black film methane tank provided by the utility model has no concrete, and solves the problems of water seepage, water leakage, air leakage and the like caused by shrinkage and expansion crack of the concrete methane tank due to temperature change; the culture wastewater treatment system comprising the black film methane tank has the advantages of low energy consumption, large treatment capacity and high safety factor.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment environmental protection, in particular to a black film methane tank and a cultivation wastewater treatment system containing the black film methane tank.
Background
At present, the annual output of livestock and poultry manure in China is about 38 hundred million tons, so a large amount of cultivation wastewater is brought, but if the treatment is not good, serious negative effects are brought to the environment and the lives of residents. The water quality characteristics of the aquaculture wastewater are different according to different manure cleaning modes (namely water-washing manure, water-soaking manure and dry manure cleaning). Wherein the dry feces has ammonia Nitrogen (NH)4 +-N) high concentration and low carbon-nitrogen ratio (C/N), while the organic matter concentration of the waste water of flushing manure and bubble manure is higher, and part of the organic matter is generally removed by an anaerobic process, so that the formed flushing manure/bubble manure anaerobic digestion liquid also has the characteristics of high ammonia nitrogen and low C/N ratio. The excessively low C/N ratio brings great challenges to the treatment of the culture wastewater, and due to the shortage of organic carbon sources, the traditional nitrification and denitrification process is adopted to treat the culture wastewater, so that the economic and effective biological denitrification is difficult to realize. The engineering measures of adding the organic carbon source can meet the requirement of denitrification on the C/N value and ensure the biological denitrification, but the cost of sewage treatment is undoubtedly increased.
At present, common biogas digesters for treating aquaculture wastewater comprise concrete biogas digesters and steel structure equipment (UASB, CSTR, ABR and the like). Generally speaking, the conventional biogas digester can solve the treatment problem of the aquaculture wastewater, but has the defects of high operation cost, unstable operation, poor safety and the like. Wherein, the concrete methane tank can shrink and expand due to temperature change, thereby causing the problems of water seepage, water leakage, air leakage and the like. The ground steel structure treatment equipment has the problems of easy corrosion of steel plates, easy damage of equipment, high operation cost and the like.
Therefore, it is necessary to provide a cultivation wastewater treatment system with high efficiency and low cost.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide a black film methane tank and a culture wastewater treatment system comprising the black film methane tank, wherein the methane tank can efficiently treat culture wastewater and has low cost; the cultivation wastewater treatment system has the advantages of low energy consumption, large treatment capacity, capability of producing liquid fertilizer which can be used as agricultural base fertilizer and top dressing, and high safety factor.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a black film methane tank comprises a pit foundation, geotextile, a lower black film, an upper black film, an air guide channel, an air guide pipe and a blind pipe; wherein the content of the first and second substances,
the geotextile is laid on the bottom surface and the wall of the pit foundation;
the lower layer black film is laid on the geotextile;
the upper layer black film is laid on the lower layer black film, the edges of the upper layer black film and the lower layer black film are fixed together, and a closed space is formed between the upper layer black film and the lower layer black film and is used for accommodating a substance to be fermented;
the gas guide channel is suspended in the object to be fermented, is used for supporting and diffusing the methane generated in the methane tank to the gas guide tube through the surrounding space; the air guide channels are multiple, and the distance between every two adjacent air guide channels is 20-30 m;
the gas guide pipe is arranged on the periphery of the pit foundation and is positioned in the closed space and used for outwards discharging methane generated in the methane tank;
one end of the blind pipe is arranged at the bottom of the pit foundation and is positioned below the geotextile, and the other end of the blind pipe is led to the outside of the pit foundation along the pit foundation and is used for eliminating the influence of underground water on the lower-layer black film;
the edges of the upper layer black film and the lower layer black film are fixed together by an anchoring groove arranged on the periphery of the pit foundation.
In the above black film methane tank, as a preferred embodiment, the gas guide channel is mainly formed by a plurality of pieces of light materials; the plurality of pieces of lightweight material are foam material.
In the above black film methane tank, as a preferred embodiment, the air guide channel comprises a foam material and a sleeve made of a film material, wherein the sleeve is filled with the foam material.
In the black film methane tank, as a preferred embodiment, the gas guide pipe is a PVC pipe, and holes with the diameter of 10-30 mm are arranged at intervals of 3 meters.
In the above-mentioned black film methane tank, as a preferred embodiment, the anchoring groove is a concave anchoring groove.
In the above black film methane tank, as a preferred embodiment, the black film is made of HDPE material; the thickness of the black film is 1.5 mm-2 mm.
The utility model also provides a breed effluent disposal system, this breed effluent disposal system, the liquid fertilizer that the energy consumption is low, the handling capacity is big, produce can do agricultural base fertilizer and additional fertilizer, factor of safety is high.
A aquaculture wastewater treatment system comprising: a solid-liquid separation unit and an anaerobic reaction unit; wherein the anaerobic reaction unit comprises the black film methane tank;
the solid-liquid separation unit is used for carrying out solid-liquid separation on the breeding excrement to obtain solid-phase pollutants and liquid-phase wastewater; the anaerobic reaction unit is connected with a liquid-phase wastewater outlet of the solid-liquid separation unit and is used for carrying out anaerobic fermentation on the liquid-phase wastewater obtained in the solid-liquid separation unit to obtain the liquid fertilizer.
Compared with the prior art, the utility model has the advantages that:
(1) the utility model discloses well black film methane-generating pit does not have the concrete, has solved the concrete methane-generating pit and has produced infiltration, the water leakage that the spalling arouses because of the temperature variation, gas leakage scheduling problem.
(2) Compared with the ground steel structure treatment equipment, the utility model discloses well black membrane methane-generating pit does not adopt ground steel structure treatment equipment, has solved the steel sheet and has perishable, equipment fragile and the high scheduling problem of working costs.
(3) The utility model designs the air guide channel in the black film methane tank, avoids the local aggregation of the methane generated by the anaerobic reaction, causes the bubbling phenomenon and avoids the explosion.
(4) The utility model designs a blind pipe for water drainage in the black film methane tank, and eliminates the influence of underground water on the film tank.
(5) The utility model provides a breed liquid manure that effluent disposal system energy consumption is low, the handling capacity is big, the production can be done agricultural base fertilizer and additional fertilizer, factor of safety is high.
(6) Adopt the utility model discloses a breed effluent disposal system, the average clearance of breed waste water COD after handling is 90.0%, NH4 +The average removal rate of-N was 92.0% and the average removal rate of TN was 85.0%.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only references to some embodiments in the present invention document, and for those skilled in the art, other drawings can be obtained according to these drawings without creative work, and some of them can be used after being adjusted.
FIG. 1 is a schematic structural view of a black film methane tank according to an embodiment of the present invention. Wherein, 1 is the pit foundation, 2 is geotechnological cloth, 3 is lower floor's black membrane, 4 is upper black membrane, 5 is the air guide passageway, 6 is the air duct, 7 is the blind pipe.
Fig. 2 is a schematic structural view of an air guide channel according to an embodiment of the present invention. Wherein 8 is a sleeve, and 9 is a foam material.
FIG. 3 is a schematic view of the installation and fixation of the upper and lower black films in the black film methane tank according to the embodiment of the present invention. Wherein, 10 is a black film methane tank, and 11 is an anchoring ditch.
FIG. 4 is a plan view of a wastewater treatment system for cultivation in accordance with an embodiment of the present invention. Wherein, 12 is a water inlet, 13 is a drain pipe, 14 is a drain pump, 15 is a vacuum pump, 16 is a sludge discharge pipe, 17 is a sludge discharge pump, and 18 is a pipeline going to the biogas purification system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto, and the described examples are only some examples, but not all examples of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "upper", "lower", "top", "bottom", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, which is only for convenience of description of the present invention and does not require the present invention to be constructed and operated in a specific position, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Referring to fig. 1, the specific embodiment of the present invention provides a black film methane tank 10, which comprises a pit foundation 1, a geotextile 2, a lower black film 3, an upper black film 4, an air guide channel 5, an air guide tube 6 and a blind tube 7; wherein, the geotextile 2 is laid on the bottom surface of the pit foundation 1 and the wall of the pit foundation 1; the lower layer black film 3 is laid on the geotextile 2; the upper layer black film 4 is laid on the lower layer black film 3, the edges of the upper layer black film 4 and the lower layer black film 3 are fixed together, and a closed space is formed between the upper layer black film 4 and the lower layer black film 3 and is used for accommodating a to-be-fermented substance; the gas guide channels 5 are suspended in the to-be-fermented materials and used for supporting, and the biogas generated in the biogas pool is diffused to the gas guide tubes 6 through the surrounding space, the number of the gas guide channels 5 is multiple, the distance between every two adjacent gas guide channels 5 is 20-30 meters, so that the local concentration of the biogas in the membrane is avoided, and the explosion risk in the production process is reduced; the gas guide pipe 6 is arranged on the periphery of the upper edge of the pit foundation 1 and is positioned in the closed space and used for outwards discharging methane generated in the methane tank; one end of the blind pipe 7 is arranged at the bottom of the pit foundation 1 and is positioned below the geotextile 2, and the other end of the blind pipe is led to the outside of the pit foundation 1 along the pit foundation 1 and is used for eliminating the influence of underground water on the lower-layer black film 3; the edges of the upper black film 4 and the lower black film 3 are fixed together by an anchoring groove 11 provided at the periphery of the pit foundation 1.
In the utility model, the geotextile 2 is laid between the lower layer black film 3 and the pit foundation 1 of the methane tank, which is used for preventing sharp objects such as gravel from damaging the black film.
As a preferred embodiment, the air guide channel 5 is formed by a plurality of pieces of air-permeable material; the material of the air guide channel 5 is a foam material.
As a preferred embodiment, the material of the air guide channel 5 may also be chosen from lightweight plastics.
As a preferred embodiment, the air guide channel 5 comprises a foam material 9 and a sleeve 8 made of a film material, wherein the sleeve 8 is filled with the foam material 9 and the film material is an air-impermeable material. Fig. 2 shows the structure of the air guide channel 5 in the embodiment of the present invention.
As shown in fig. 2, the gas guide channel 5 is surrounded by HDPE film, which is a gas impermeable material, so that gas cannot pass through the material of which the gas guide channel 5 is made. In the utility model, the air guide channel 5 plays a supporting role to form a certain space, and the gas can diffuse to the exhaust pipeline through the surrounding space of the air guide channel 5, thereby ensuring that the local gathering of the methane can not occur in the membrane; the arrangement of the air guide channel 5 avoids the bubbling phenomenon caused by the local accumulation of the methane generated in the early anaerobic stage, thereby avoiding the explosion.
The utility model discloses an it forms air guide channel 5 to fill foam material in the sleeve that the membrane material welded into, and its reason lies in, and the weight of air guide channel 5 that directly fills foam material formation in the membrane material is lighter relatively, and rivers have certain influence to produce air guide channel 5's position, and waste water has certain corrosivity, can influence air guide channel 5's life.
In the utility model, the upper black film 4 and the air guide channel 5 can be discharged along with the object to be fermented and the fermentation of the object to be fermented gradually rises. At the initial stage of anaerobic reaction, when the amount of methane is small, the upper layer black film 4 is easy to adhere to the liquid surface, so that foam or light porous plastic is added between the upper layer black film 4 and the lower layer black film 3 to form an air guide channel 5, so that the methane can be discharged in time. The gas guide channel 5 floats freely in the methane tank, and the position of the gas guide channel 5 does not drift greatly due to relatively slow water flow. With the increase of the waste water amount entering the black film methane tank 10 or the increase of the methane generation amount, the volume of the black film methane tank 10 is also increased continuously, therefore, the methane storage amount of the black film methane tank 10 provided in the specific embodiment of the utility model is more than 10 times of that of the conventional methane tank.
In a preferred embodiment, the air duct 6 is a PVC pipe, and the air duct 6 has holes with the diameter of 10 mm-30 mm every 3 meters. In the utility model, the methane is diffused to the air duct 6 for external discharge treatment.
In a preferred embodiment, the anchor grooves 11 for fixing the upper black film 4 and the lower black film 3 are concave anchor grooves.
Fig. 3 shows a schematic view of the installation and fixation of the upper black film 4 and the lower black film 3 in the black film methane tank 10 according to the embodiment of the present invention.
As a preferred embodiment, in the specific embodiment of the present invention, the black film is made of HDPE material; the thickness of the black film is 1.5 mm-2 mm.
In practice, different thicknesses of HDPE film can be selected depending on the desired conditions in the field, due to the need for specialized welding. In the utility model, the black film is a hard material, and is different from common plastic films. The black film has a heat absorption function and can reduce the energy consumption of anaerobic reaction.
As a preferred embodiment, the black film methane tank 10 further comprises a water inlet 12, a sludge discharge pipeline 16 and a drainage pipeline 13.
As shown in fig. 4, the water inlet 12 is located above the tank wall for introducing the liquid after solid-liquid separation, and no additional tap water is required. The sludge discharge pipeline 16 is connected with a sludge discharge pump 17 and is used for discharging the sludge deposited in the black film methane tank 10 out of the methane tank through the sludge discharge pump 17. The drainage pipeline 13 is used for discharging the liquid fertilizer produced in the methane tank out of the methane tank through the drainage pump 14.
As a preferred embodiment, a vacuum tank 15 is respectively arranged in front of the drainage pump 14 and the sludge pump 17 for increasing the suction distance of drainage and sludge discharge, saving investment and improving operation effect.
The utility model discloses in, when the construction, upper black membrane 4 and lower floor's black membrane 3 are hugged closely, and there is water inlet 12 in the centre, along with waiting the row of zymotic object, upper black membrane 4 risees along with the liquid level gradually, along with going on of anaerobic reaction, marsh gas volume increases gradually, and upper black membrane 4 finally is the yurt shape.
The utility model discloses the embodiment mode still provides a breed effluent disposal system, and this breed effluent disposal system, the liquid fertilizer that the energy consumption is low, the handling capacity is big, the production can be done agricultural base fertilizer and additional fertilizer, factor of safety is high.
A aquaculture wastewater treatment system comprising: a solid-liquid separation unit and an anaerobic reaction unit; wherein, the anaerobic reaction unit comprises the black film methane tank 10;
the solid-liquid separation unit is used for carrying out solid-liquid separation on the breeding excrement to obtain solid-phase pollutants and liquid-phase wastewater; the anaerobic reaction unit is connected with a liquid-phase wastewater outlet of the solid-liquid separation unit and is used for carrying out anaerobic fermentation on the liquid-phase wastewater obtained in the solid-liquid separation unit to obtain the liquid fertilizer.
Example 1
The embodiment provides a breed effluent disposal system, includes: a solid-liquid separation system, an aerobic composting system and an anaerobic reaction system. Wherein, the anaerobic reaction system comprises a black film methane tank. As shown in fig. 1, the black film methane tank 10 comprises a pit foundation 1, a geotextile 2, a lower black film 3, an upper black film 4, a blind pipe 7, an air guide channel 5 and an air guide pipe 6. Wherein, one end of the blind pipe 7 is arranged at the bottom of the pit foundation 1 and is positioned below the geotextile 2, and the other end of the blind pipe is led to the outside of the pit foundation 1 along the pit foundation 1 and is used for eliminating the influence of underground water on the lower black film 3 of the methane tank.
As shown in fig. 1, the pit bottom base size of the black film methane tank 10 is: 82m 116m 5m (width, length and height) and gradient of 1:2, laying a layer of geotextile 2 on a pit foundation 1, then laying a lower layer of black film 3 on the geotextile 2, filling foam material 9 with the size of 300mm 3000mm in a sleeve 8 which is sealed by HDPE film material in a long welding way to form air guide channels 5 with the length of 82 meters (as shown in figure 2), laying the air guide channels 5 on the lower layer of black film 3, and spacing every two air guide channels 5 by 20 meters; air ducts 6 are laid around the pit foundation 1; the upper layer black film 4 is laid above the air guide channel 5, and the upper layer black film 4 and the lower layer black film 3 are fixed by an anchoring groove 11 (shown in figure 3) at the periphery of the pit foundation 1 to form a closed anaerobic fermentation space. Wherein, the material of the black film is HDPE.
According to the production situation, as shown in fig. 4, the waste water is discharged into the black film methane tank 10 from the water inlet 12 through the pressure pipeline, because the upper black film 4 and the lower black film 3 are tightly attached to form a closed oxygen-free environment, the waste water is subjected to anaerobic fermentation by virtue of the solar heat absorbed by the black films to produce methane, the methane can be generated or combusted and discharged after being purified by the methane purification system 18, and the methane liquid can be discharged once in half a year or a year for agricultural irrigation according to the design.
The sewage is discharged into the sewage without any operation and automatically runs.
When the amount of the biogas is less at the initial stage of the anaerobic reaction, the upper layer black film 4 is easy to adhere to the liquid surface, and the gas guide channel 5 formed by the foam material or the light porous plastic added between the upper layer black film 4 and the lower layer black film 3 can discharge the biogas in time.
Along with the increase of the amount of wastewater entering the methane tank, the upper black film 4 gradually rises along with the liquid level, and along with the progress of anaerobic reaction, the amount of methane gradually increases, and the upper black film 4 finally takes the shape of a Mongolian yurt. Meanwhile, the gas guide channel 5 is suspended in the wastewater, so that the phenomenon of bubbling caused by local aggregation of methane generated by anaerobic reaction is avoided along with the proceeding of the anaerobic reaction, and explosion is avoided.
The volume of the black film methane tank 10 is also increased continuously due to the increase of the waste water amount entering the methane tank or the increase of the methane generation amount, so that the methane storage amount of the black film methane tank 10 can be more than 10 times of that of the conventional methane tank.
In the embodiment, the breeding wastewater treatment system is used for treating breeding manure from a pig farm, after solid-liquid separation of the breeding manure, solid phase is subjected to aerobic composting to produce organic fertilizer, and liquid phase enters a black film methane tank to be subjected to anaerobic fermentation. The average water quality of the liquid phase entering the black film is COD: 52800mg/L, NH4 +-N：4800mg/L。
Introducing the liquid-phase aquaculture wastewater obtained by solid-liquid separation at 20t/d into a black film methane tank 10, carrying out anaerobic reaction for 50 days at normal temperature, wherein the water quality of the treated aquaculture wastewater is COD 5280mg/L and NH4 +-N384 mg/L; the average COD removal rate of the treated aquaculture wastewater is 90.0 percent, and NH is4 +The average removal rate of-N was 92.0% and the average removal rate of TN was 85.0%. The treated aquaculture wastewater is directly irrigated by a pipe network as liquid fertilizer or used as base fertilizer or top dressing for agriculture.
According to analysis, the utility model designs the air guide channel on the black film methane tank, thereby avoiding local aggregation of methane generated by anaerobic reaction, causing bubbling phenomenon and avoiding explosion; the drainage blind pipe designed on the black film methane tank eliminates the influence of underground water on the film tank. The utility model provides a breed liquid manure that effluent disposal system energy consumption is low, the handling capacity is big, the production can be done agricultural base fertilizer and additional fertilizer, factor of safety is high.
Claims (7)
1. A black film methane tank is characterized in that the black film methane tank comprises a pit foundation, geotextiles, a lower black film, an upper black film, an air guide channel, an air guide pipe and a blind pipe; wherein the content of the first and second substances,
the geotextile is laid on the bottom surface and the wall of the pit foundation;
the lower layer black film is laid on the geotextile;
the upper layer black film is laid on the lower layer black film, the edges of the upper layer black film and the lower layer black film are fixed together, and a closed space is formed between the upper layer black film and the lower layer black film and is used for accommodating a substance to be fermented;
the gas guide channel is suspended in the object to be fermented, is used for supporting and diffusing the methane generated in the methane tank to the gas guide tube through the surrounding space; the air guide channels are multiple, and the distance between every two adjacent air guide channels is 20-30 m;
the gas guide pipe is arranged on the periphery of the pit foundation and is positioned in the closed space and used for outwards discharging methane generated in the methane tank;
one end of the blind pipe is arranged at the bottom of the pit foundation and is positioned below the geotextile, and the other end of the blind pipe is led to the outside of the pit foundation along the pit foundation and is used for eliminating the influence of underground water on the lower-layer black film;
the edges of the upper layer black film and the lower layer black film are fixed together by an anchoring groove arranged on the periphery of the pit foundation.
2. The black film biogas digester as claimed in claim 1, wherein the gas guide channel is mainly formed by a plurality of pieces of light material; the plurality of pieces of lightweight material are foam material.
3. The black film biogas digester according to claim 2, wherein the gas guide channel comprises a foam material and a sleeve made of a film material, wherein the sleeve is filled with the foam material.
4. The black film biogas digester according to claim 1, wherein the gas-guide tube is a PVC tube, and the gas-guide tube has holes of 10 mm-30 mm every 3 meters.
5. The black film biogas digester according to claim 1, wherein the anchoring groove is a concave anchoring groove.
6. The black film biogas digester according to claim 1, wherein the thickness of the black film is 1.5mm to 2 mm.
7. A aquaculture wastewater treatment system, said system comprising: a solid-liquid separation unit and an anaerobic reaction unit; wherein the anaerobic reaction unit comprises a black film biogas digester according to any one of claims 1 to 6;
the solid-liquid separation unit is used for carrying out solid-liquid separation on the breeding excrement to obtain solid-phase pollutants and liquid-phase wastewater;
the anaerobic reaction unit is connected with a liquid-phase wastewater outlet of the solid-liquid separation unit and is used for carrying out anaerobic fermentation on the liquid-phase wastewater obtained in the solid-liquid separation unit to obtain the liquid fertilizer.
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| CN202022710523.9U CN214218311U (en) | 2020-11-20 | 2020-11-20 | Black film methane tank and culture wastewater treatment system comprising same |
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| CN202022710523.9U CN214218311U (en) | 2020-11-20 | 2020-11-20 | Black film methane tank and culture wastewater treatment system comprising same |
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