CN212050988U - Sewage treatment device - Google Patents
Sewage treatment device Download PDFInfo
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- CN212050988U CN212050988U CN202020221878.9U CN202020221878U CN212050988U CN 212050988 U CN212050988 U CN 212050988U CN 202020221878 U CN202020221878 U CN 202020221878U CN 212050988 U CN212050988 U CN 212050988U
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Abstract
The utility model provides a sewage treatment device, which comprises a box body, a plurality of partition walls and a plurality of baffle plates, wherein the box body is internally divided into a plurality of partition walls; the plurality of partitions sequentially comprise a regulating tank, a nitrogen treatment area and a membrane biological reaction tank, a water inlet of the membrane biological reaction tank is connected with a water outlet of the nitrogen treatment area, a water inlet of the nitrogen treatment area is connected with a water outlet of the regulating tank, and the regulating tank is used for regulating water quality and water quantity; and the nitrogen treatment zone comprises at least one reaction group which is sequentially arranged according to the water flow direction, and each reaction group comprises an anoxic tank for carrying out denitrification reaction and an aerobic tank for carrying out nitrification reaction. The utility model provides a sewage treatment plant can improve the clearance of sewage factory effluent total nitrogen and suspended solid.
Description
Technical Field
The utility model relates to a technical field of environmental protection equipment, concretely relates to sewage treatment plant.
Background
The national requirements for removing the total nitrogen from the sewage plants in cities and towns are gradually increased, particularly for sewage plants which discharge water for supplementing water to rivers and lakes or regenerating water sources. Meanwhile, the effluent Suspended Solids (SS) of the urban sewage plant are also strictly controlled based on the high requirement of the country on the effluent cleanliness.
At present, the equipment for rural sewage treatment is basically equipment adopting conventional processes, such as biochemistry, sedimentation, sand filtration and the like. The conventional biochemical process is always the mainstream process of sewage treatment because of the advantages of long-term operation and low cost of equipment in sewage treatment, and equipment adopting the biochemical process is also common sewage treatment equipment. However, because rural sewage has the characteristics of low carbon-nitrogen ratio of inlet water and uneven water inflow, the biochemical process has the defect of poor total nitrogen removal effect in the sewage treatment process, and the biochemical process can not treat suspended matters in the sewage.
Therefore, how to improve the removal rate of total nitrogen and suspended matters by improving the technical means on the basis of the conventional process equipment is a great test faced by the current environmental protection industry, and the research and development of a practical sewage treatment device with excellent treatment capacity is urgent.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a sewage treatment plant can improve the clearance of sewage factory effluent total nitrogen and suspended solid.
The sewage treatment device provided by the utility model comprises a box body which is divided into a plurality of partitions by partition plates;
the plurality of partitions sequentially comprise a regulating reservoir, a nitrogen treatment region and a membrane biological reaction reservoir, a water inlet of the membrane biological reaction reservoir is connected with a water outlet of the nitrogen treatment region, a water inlet of the nitrogen treatment region is connected with a water outlet of the regulating reservoir, and the regulating reservoir is used for regulating water quality and water quantity; and the number of the first and second groups,
the nitrogen treatment zone comprises at least one reaction group which is sequentially arranged according to the water flow direction, and each reaction group comprises an anoxic tank for carrying out denitrification reaction and an aerobic tank for carrying out nitrification reaction.
Optionally, the at least one reaction group is a reaction group comprising:
the water inlet of the first anoxic pond is connected with the water outlet of the regulating pond;
the water inlet of the first aerobic pool is connected with the water outlet of the first anoxic pool, and the backflow outlet of the first aerobic pool is connected with the backflow inlet of the first anoxic pool;
the water inlet of the second anoxic tank is connected with the water outlet of the first aerobic tank;
a water inlet of the second aerobic tank is connected with a water outlet of the second anoxic tank, and the water outlet is connected with a water inlet of the membrane biological reaction tank;
and the backflow outlet of the membrane biological reaction tank is connected with the backflow inlet of the first aerobic tank.
Optionally, the first anoxic tank and/or the second anoxic tank are provided with:
the stirrer is used for stirring the denitrification sludge in the anoxic tank; and/or the presence of a gas in the gas,
the biological rope filler is used for adsorbing planktonic denitrifying bacteria.
Optionally, the first aerobic tank and/or the second aerobic tank are provided with: the system comprises a micropore aeration device and a high-pressure fan, wherein the micropore aeration device aerates the aerobic tank through the high-pressure fan;
and a reflux pump is arranged in the first aerobic tank to reflux the nitrified liquid to the first anoxic tank, and a reflux pump is arranged in the membrane biological reaction tank to reflux the intercepted activated sludge to the first aerobic tank.
Optionally, at least one of the following devices is installed in the regulating reservoir:
the stainless steel fine grid is arranged between the water inlet and the water outlet of the regulating tank;
the sewage submersible pump is arranged in the regulating tank to crush sewage impurities in the regulating tank;
the liquid level meter is used for monitoring the liquid level in the regulating reservoir;
and the flowmeter is used for monitoring the water flow of the inlet water of the regulating reservoir.
Optionally, the membrane biological reaction tank comprises a membrane module and a perforated aeration pipe arranged at the interception side of the membrane module, wherein,
macromolecular organic matters and sludge suspended matters are intercepted on the intercepting side of the membrane component;
and the perforated aeration pipe performs aeration to the interception side of the membrane component through a high-pressure fan.
Optionally, the plurality of partitions further comprises:
the clean water tank is connected with the membrane biological reaction tank and is used for cleaning the membrane component of the membrane biological reaction tank through clean water or receiving the effluent of the membrane biological reaction tank and discharging the effluent after sodium chlorate disinfection;
and the sludge storage tank is connected with the membrane biological reaction tank to receive the sludge discharged by the membrane biological reaction tank.
Optionally, the outer part of the box body is coated with a carbon steel anticorrosive material.
Optionally, the sewage treatment device further comprises a grid channel connected with the box body, and the grid channel receives sewage to be treated and conveys the received sewage into the box body.
Optionally, a coarse grid grate is installed in the grid ditch to filter suspended matters in the sewage after the sewage to be treated passes through the coarse grid grate.
The utility model has the advantages of it is following or beneficial effect:
the sewage treatment device comprises a box body, wherein the interior of the box body is divided into a plurality of partitions by partition plates; the plurality of partitions sequentially comprise an adjusting tank, a nitrogen treatment area and a membrane biological reaction tank, wherein the adjusting tank adjusts the water quality and the water quantity, the nitrogen treatment area removes nitrogen through an anoxic tank for performing denitrification reaction and an aerobic tank for performing nitrification reaction, and then the membrane biological reaction tank performs further deep purification and suspended matter filtration on sewage, so that the removal rate of total nitrogen and suspended matters in the effluent of a sewage plant is improved, and the performance is more reliable; in addition, the treatment device is an integrated box body, so the device is suitable for various environments, the operation is simpler, and the sewage treatment is easier to implement.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing embodiments of the present invention with reference to the following drawings, in which:
FIG. 1 is a schematic structural view of a sewage treatment apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another sewage treatment device according to the embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention. The figures are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the sewage treatment device provided by the present invention. Referring to fig. 1, the sewage treatment apparatus includes a tank 100 partitioned into a plurality of partitions by partitions 110; the plurality of partitions sequentially comprise an adjusting tank 120, a nitrogen treatment area 130 and a Membrane biological-Reactor (MBR) tank 140, wherein a water inlet of the Membrane biological-Reactor 140 is connected with a water outlet of the nitrogen treatment area 130, a water inlet of the nitrogen treatment area 130 is connected with a water outlet of the adjusting tank 120, and the adjusting tank 120 is used for adjusting water quality and water quantity; and, the nitrogen treatment zone 130 includes at least one reaction group arranged in sequence in the water flow direction, and each reaction group includes an anoxic tank for performing denitrification reaction and an aerobic tank for performing nitrification reaction.
Specifically, the exterior of the box 100 may be coated with a carbon steel anticorrosive material, so that the box 100 may maintain a long service life in various environments, for example, the box 100 may be buried underground, which is beneficial to achieve unattended operation. When the box buries in the underground, correspond the overground part and can set up and enclose fender and plant flowers and plants all around to can avoid noise and stink and disturb the problem production of people.
The water inlet of the membrane biological reaction tank 140 and the water outlet of the nitrogen treatment zone 130 can be communicated through a pipe inserted in the intermediate partition plate 110, and similarly, the water inlet of the membrane biological reaction tank 140 and the water outlet of the nitrogen treatment zone 130 can be connected through a pipe inserted in the intermediate partition plate 110.
It should be noted that, the adjusting tank 120 is set to have a preset time (for example, 9 hours) for the sewage staying in the tank, that is, after the sewage treatment starts, the water outlet of the adjusting tank 120 is opened after the adjusting tank 120 receives the sewage for the preset time, so that the water in the adjusting tank 120 is drained while the water is fed, the water in the adjusting tank 120 can be fully mixed, the uniformity of the water quality is ensured, and the nitrogen treatment area 130 is facilitated to achieve a better nitrogen treatment effect. The nitrification reaction in the nitrogen treatment zone 130 is to convert ammonia nitrogen into nitrate nitrogen and nitrite nitrogen, the denitrification reaction is to convert nitrate nitrogen and nitrite nitrogen into nitrogen, and the total nitrogen in the sewage is eliminated when the nitrogen is discharged to the outside of the water.
In the embodiment of the present invention, the multiple partitions of the box 100 sequentially include the regulating reservoir 120, the nitrogen treatment area 130 and the membrane biological reaction tank 140, wherein the regulating reservoir 120 regulates the water quality and the water quantity, the nitrogen treatment area 130 removes nitrogen through the anoxic tank for performing denitrification reaction and the aerobic tank for performing nitrification reaction, and then the membrane biological reaction tank 140 performs further deep purification and filtration of suspended solids on sewage, so as to improve the removal rate of total nitrogen and suspended solids in the effluent of the sewage plant, and the performance is relatively reliable; moreover, the treatment device is an integrated box body 100, so that the box body 100 only needs to be arranged at a required place when in use, and the sewage treatment device capable of removing the total nitrogen and suspended matters is suitable for various environments, is simpler to operate and is easier to implement sewage treatment.
The specific structure of the sewage treatment apparatus will be described in detail below.
Referring to fig. 1, in an alternative embodiment, the sewage treatment apparatus further includes a grid channel 200 connected to the tank 100, the grid channel 200 receiving sewage to be treated and transferring the received sewage into the tank 100. Specifically, the coarse grid grates may be installed in the grid channels 200, so that suspended substances in the sewage after the sewage to be treated passes through the coarse grid grates are conveniently filtered.
In another alternative embodiment, the conditioning tank 120 is equipped with at least one of the following:
a stainless steel fine grid arranged at the water inlet and the water outlet B of the adjusting tank 1200Thereby preventing suspended impurities in the sewage from entering the nitrogen treatment zone 130 and the membrane biological reaction tank 140, and the fine grid can be a basket-type fine grid, so that the fine grid can be lifted out of the adjusting tank 120 for convenient cleaning after being fully wound with suspended matters in the sewage;
the submersible sewage pump is arranged in the regulating reservoir 120 to crush sewage impurities (such as long fibers, bags, belts, grass, cloth strips and the like) in the regulating reservoir 120, and can be arranged into two sets of equipment with one set for one use and one set for standby, namely, the first set is used for crushing the impurities, and the second set is used as the standby equipment to be put into use in time under the condition that the first set breaks down;
the liquid level meter is used for monitoring the liquid level in the regulating reservoir, so that the water quantity can be conveniently regulated by controlling the water inflow of the regulating reservoir 120 in real time;
and the flowmeter is used for monitoring the water inflow rate of the regulating reservoir, so that the water inflow rate of the regulating reservoir 120 can be conveniently controlled, and too much or too little water in the regulating reservoir 120 is avoided.
Referring to fig. 2, in another alternative embodiment, the at least one reaction group includes two reaction groups, the two reaction groups including:
a first anoxic tank 131 and a water inlet A1And a water outlet B of the regulating reservoir 1200Connecting;
a first aerobic tank 132 and a water inlet A2And a water outlet B of the first anoxic tank 1311Is connected, and the return outlet C2 is connected with the return inlet A1 of the first anoxic tank 131 so as to make the nitrified liquid return to the first anoxic tank 131;
the water inlet A3 of the second anoxic tank 133 is connected with the water outlet B2 of the first aerobic tank 132;
the water inlet A4 of the second aerobic pool 134 is connected with the water outlet B3 of the second anoxic pool 133, and the water outlet B3 is connected with the water inlet A5 of the membrane biological reaction pool 140;
and the return outlet C5 of the membrane biological reaction tank 140 is connected with the return inlet D2 of the first aerobic tank 132 so that the intercepted activated sludge returns to the first aerobic tank 132.
Specifically, after the sewage treatment is started, the first anoxic tank 131 first controls the dissolved oxygen to be 0.5mg/L and the pH value to be 7-8 to wait for the mass propagation of the denitrifying bacteria. In the adjusting stage, alkali generated by the anoxic tank in each reaction group can not be supplied to the aerobic tank for the requirement, and the alkali can be properly added into the aerobic tank to maintain the alkalinity required by nitrification in the aerobic tank.
The denitrifying bacteria are facultative heterotrophic bacteria, the influent carbon source of the first anoxic pond 131 is used as a nutrient for self growth at the beginning, and the generation cycle of the denitrifying bacteria is as long as about 15 days, so that the carbon source is added to supplement the nutrient required by the denitrifying bacteria when necessary.
After the regulation stage is finished, the aeration rate of the first anoxic tank 131 and the second anoxic tank 133 is designed according to the gas-water ratio of 1:8, and the dissolved oxygen is controlled to be 2-3 mg/L.
The activated sludge concentration in the two reaction groups presents gradient distribution, which is respectively as follows: the concentration of the activated sludge in the first anoxic tank 131 is 4000mg/L, the concentration of the activated sludge in the first aerobic tank 132 is 3500mg/L, the concentration of the activated sludge in the second anoxic tank 133 is 3000mg/L, the concentration of the activated sludge in the second aerobic tank 134 is 2000mg/L, and the activated sludge concentration in the membrane biological reaction tank 140 is 6000mg/L, and each reaction tank needs to be periodically beaten to maintain the sludge of the system to be constant.
It should be noted that the first aerobic tank 132 is not only connected to the second anoxic tank 133, but also connected to the first anoxic tank 131 through the backflow outlet C2, if nitrate nitrogen and nitrite nitrogen exist in the sewage flowing into the second anoxic tank 133 in the first aerobic tank 132, the second anoxic tank 133 further nitrites the nitrate nitrogen and nitrite nitrogen in the sewage, the second aerobic tank 134 plays a role in reacting residual organic matters and ammonia nitrogen in the sewage, and the effluent from the second aerobic tank 134 enters the membrane biological reaction tank 140 for further removing organic matters and intercepting sludge suspended matters.
In the embodiment of the invention, the anoxic tanks in each reaction group are arranged in front of the aerobic tanks according to the water flow direction, and the water outlet is connected with the water inlet of the aerobic tank, so that alkali generated by the previous anoxic tank can be supplied to the next adjacent aerobic tank, the addition of alkali in the aerobic tanks is reduced, and the cost is saved.
Further, the first anoxic tank 131 and/or the second anoxic tank 133 are provided with: the stirrer is used for stirring the denitrification sludge in the anoxic tank, so that the denitrification sludge in the anoxic tank is in a suspended state, and the inlet water of the anoxic tank is fully mixed with the denitrification sludge; and/or the biological rope filler is used for adsorbing planktonic denitrifying bacteria, specifically, the biological rope filler can be arranged in a three-dimensional grid form in the anoxic tank, and the contact area of the denitrifying bacteria and sewage is increased by the biological rope filler, so that the effect of fully mixing the inlet water of the anoxic tank with the denitrifying sludge is also achieved.
Further, the first aerobic tank 132 and/or the second aerobic tank 134 are provided with: the micro-pore aeration device aerates the aerobic tank through the high-pressure fan so as to fully degrade organic matters in the tank; and a return pump is arranged in the first aerobic tank 132 to return the nitrified liquid to the first anoxic tank 131, and a return pump is arranged in the membrane biological reaction tank 140 to return the intercepted activated sludge to the first aerobic tank 132. Furthermore, a biological rope packing can be disposed in the first aerobic tank 132 and/or the second aerobic tank 134 to increase the contact area between the nitrifying bacteria and the sewage through the biological rope packing.
In another alternative embodiment, the membrane bioreactor 140 comprises a membrane module and a perforated aeration pipe arranged on the interception side of the membrane module, wherein the membrane module can adopt a flat membrane with large flux, pollution resistance and easy cleaning, and the membrane module enables the interception side of the membrane module to intercept macromolecular organic matters and sludge suspended matters by selecting the permeability characteristics; the perforated aeration pipe carries out aeration to the interception side of the membrane component through the high-pressure fan, the membrane component membrane is not easy to be adhered with sludge due to continuous scouring of the membrane component membrane caused by the aeration, and the aerobic environment enables sewage to continue to degrade through dissolved oxygen in the aeration membrane biological reaction tank 140 reaching 5-6mg/L, so that the water outlet index is kept.
Referring to fig. 2, in another alternative embodiment, the plurality of partitions further comprises:
the clean water tank 150 is connected with the membrane biological reaction tank 140, the clean water tank 150 is used for cleaning the membrane components of the membrane biological reaction tank 150 on line through clean water so as to ensure the continuous use of the membrane biological reaction tank 140, or the clean water tank 150 is used for receiving the effluent of the membrane biological reaction tank 140 and discharging the effluent after sodium chlorate disinfection, so that the obtained water can be directly reused;
the sludge storage tank 160 is connected with the membrane biological reaction tank 140 to receive the sludge discharged from the membrane biological reaction tank 140.
Specifically, the clean water tank 150 may be connected to the membrane bioreactor 140 via two different pipes, referring to FIG. 2, the drain B of the membrane bioreactor 1405And the water inlet A of the clean water tank 1506Connected by a first pipe, the water outlet B of the clean water tank 1506And a water inlet E of the membrane biological reaction tank 1405Connected by a second conduit. Moreover, a self-priming pump of the membrane biological reaction tank 140 can be arranged on the first pipeline, so that the membrane biological reaction tank 140 can suck clean water in the clean water tank 150; the second pipe may be provided with a backwash pump of the membrane biological reaction tank 140 so that the water treated in the membrane biological reaction tank 140 is sucked back to the clean water tank 150.
The sludge storage tank 160 may be provided with an overflow outlet F7 The adjusting tank 120 may be provided with an overflow inlet F0And an overflow outlet F7And an overflow inlet F0An overflow pipe is connected between the sludge storage tank 160 and the adjusting tank 120, so that the supernatant separated out from the sludge storage tank is returned to the adjusting tank through the overflow pipe, and is discharged as a usable clean water source after being treated again. The sludge in the membrane biological reaction tank 140 can be discharged to the sludge storage tank 160 periodically, and the duration is determined according to the inactivation period of fungi in the sludge; the sludge in the sludge storage tank 160 can be transported out once after a preset interval period, wherein the preset interval period is longer than the sludge discharge interval duration of the membrane biological reaction tank 140.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A sewage treatment device is characterized in that,
the sewage treatment device comprises a box body which is partitioned into a plurality of partitions by partition plates;
the plurality of partitions sequentially comprise a regulating reservoir, a nitrogen treatment region and a membrane biological reaction reservoir, a water inlet of the membrane biological reaction reservoir is connected with a water outlet of the nitrogen treatment region, a water inlet of the nitrogen treatment region is connected with a water outlet of the regulating reservoir, and the regulating reservoir is used for regulating water quality and water quantity; and the number of the first and second groups,
the nitrogen treatment zone comprises at least one reaction group which is sequentially arranged according to the water flow direction, and each reaction group comprises an anoxic tank for carrying out denitrification reaction and an aerobic tank for carrying out nitrification reaction.
2. The wastewater treatment plant of claim 1, wherein the at least one reaction group is a reaction group comprising:
the water inlet of the first anoxic pond is connected with the water outlet of the regulating pond;
the water inlet of the first aerobic pool is connected with the water outlet of the first anoxic pool, and the backflow outlet of the first aerobic pool is connected with the backflow inlet of the first anoxic pool;
the water inlet of the second anoxic tank is connected with the water outlet of the first aerobic tank;
a water inlet of the second aerobic tank is connected with a water outlet of the second anoxic tank, and the water outlet is connected with a water inlet of the membrane biological reaction tank;
and the backflow outlet of the membrane biological reaction tank is connected with the backflow inlet of the first aerobic tank.
3. The wastewater treatment apparatus according to claim 2, wherein the first anoxic tank and/or the second anoxic tank is provided with:
the stirrer is used for stirring the denitrification sludge in the anoxic tank; and/or the presence of a gas in the gas,
the biological rope filler is used for adsorbing planktonic denitrifying bacteria.
4. The sewage treatment apparatus according to claim 2,
the first aerobic tank and/or the second aerobic tank are internally provided with: the system comprises a micropore aeration device and a high-pressure fan, wherein the micropore aeration device aerates the aerobic tank through the high-pressure fan;
and a reflux pump is arranged in the first aerobic tank to reflux the nitrified liquid to the first anoxic tank, and a reflux pump is arranged in the membrane biological reaction tank to reflux the intercepted activated sludge to the first aerobic tank.
5. The wastewater treatment device according to claim 1, wherein at least one of the following devices is installed in the regulation tank:
the stainless steel fine grid is arranged between the water inlet and the water outlet of the regulating tank;
the sewage submersible pump is arranged in the regulating tank to crush sewage impurities in the regulating tank;
the liquid level meter is used for monitoring the liquid level in the regulating reservoir;
and the flowmeter is used for monitoring the water flow of the inlet water of the regulating reservoir.
6. The wastewater treatment apparatus according to claim 1, wherein the membrane biological reaction tank comprises a membrane module and a perforated aeration pipe disposed on a retentate side of the membrane module, wherein,
macromolecular organic matters and sludge suspended matters are intercepted on the intercepting side of the membrane component;
and the perforated aeration pipe performs aeration to the interception side of the membrane component through a high-pressure fan.
7. The wastewater treatment apparatus of claim 1, wherein the plurality of partitions further comprises:
the clean water tank is connected with the membrane biological reaction tank and is used for cleaning the membrane component of the membrane biological reaction tank through clean water or receiving the effluent of the membrane biological reaction tank and discharging the effluent after sodium chlorate disinfection;
and the sludge storage tank is connected with the membrane biological reaction tank to receive the sludge discharged by the membrane biological reaction tank.
8. The sewage treatment device of claim 1, wherein the tank is externally coated with a carbon steel corrosion-resistant material.
9. The wastewater treatment apparatus of claim 1, further comprising a grid channel connected to the tank, the grid channel receiving wastewater to be treated and conveying the received wastewater to the tank.
10. The sewage treatment device according to claim 9, wherein a coarse grid grate is installed in the grid ditch to filter suspended substances in sewage after the sewage to be treated passes through the coarse grid grate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020221878.9U CN212050988U (en) | 2020-02-27 | 2020-02-27 | Sewage treatment device |
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| CN202020221878.9U CN212050988U (en) | 2020-02-27 | 2020-02-27 | Sewage treatment device |
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| CN212050988U true CN212050988U (en) | 2020-12-01 |
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| CN202020221878.9U Active CN212050988U (en) | 2020-02-27 | 2020-02-27 | Sewage treatment device |
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