CN113184942B - Three-phase separator - Google Patents

Three-phase separator Download PDF

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Publication number
CN113184942B
CN113184942B CN202110730910.5A CN202110730910A CN113184942B CN 113184942 B CN113184942 B CN 113184942B CN 202110730910 A CN202110730910 A CN 202110730910A CN 113184942 B CN113184942 B CN 113184942B
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shell
sludge
weir
water
sewage
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CN113184942A (en
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汤雨林
周健
丁健
赵媛
宗兆洋
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Suzhou Zhanqing Environment Technology Co ltd
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Suzhou Zhanqing Environment Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/20Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/127Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Sewage (AREA)

Abstract

The invention discloses a three-phase separator, which comprises a shell, a water falling weir, water falling baffles, a water outlet pipe and a sludge return pipe, wherein the shell is of a sharp-bottomed barrel structure with an opening at the upper end and a closed lower end, at least one water falling weir is fixed on the inner side wall of the opening part of the shell at intervals, at least one water falling baffle arranged in an inclined state is fixed on the inner side wall of the shell, the water falling baffles are positioned under the water falling weir, sewage entering the shell through the water falling weir falls to the surface of the water falling baffles and then is bent at a set angle and flows into the bottom of the inner side of the shell, the water outlet pipe and the sludge return pipe are fixed on the shell, the water inlet of the water outlet pipe is positioned below the water falling weir in a back direction, the water inlet of the water outlet pipe is not higher than the height of the water surface in the shell, and the sludge return pipe inlet is positioned at the tip of the bottom surface of the shell, the invention solves the problems of three-phase separation and sludge loss in a high-efficiency denitrification process, the problem of mutual interference of the sludge in the anaerobic section, the anoxic section and the aerobic section of the biochemical tank is avoided, and the sewage treatment efficiency is improved.

Description

Three-phase separator
Technical Field
The invention relates to the technical field of water treatment, in particular to a three-phase separator.
Background
The efficient denitrification process mainly comprises a denitrification high tower and a denitrification filter tank, nitrogen generated by denitrification sludge in the denitrification process is easy to be tightly combined with sludge, the phenomenon of air bubbles wrapped by sludge often occurs, denitrification sludge is separated from a reaction zone after gas generated by the denitrification sludge floats upwards, the sludge concentration in the reaction zone is reduced, the nitrate nitrogen removal capacity of the process is influenced, the sludge concentration floating in effluent is increased, the effluent water quality is influenced, the three-phase separation technology of the anaerobic process hardly enables the denitrification process to complete three-phase separation of sludge, nitrogen and sewage, and the denitrification processes such as the denitrification high tower and the upflow denitrification filter tank face the problem of three-phase separation.
The most common method for treating activated sludge by water is an anaerobic-anoxic-aerobic (AAO) process, the difference of the microbial compositions of the sludge required by an anaerobic section, an anoxic section and an aerobic section is large, and the sludge age and the reaction conditions of the sludge are also obviously different. However, the sludge in the anaerobic section, the anoxic section and the aerobic section are mixed together and circulate in the whole process section because the sludge in the anaerobic-anoxic-aerobic three process sections are communicated and the sludge in the aerobic tank and the sedimentation tank directly flows back to the anoxic tank and the anaerobic tank. In the anaerobic-anoxic-aerobic (AAO) process, a large amount of aerobic sludge appears in the anaerobic section and the anoxic section due to unreasonable sludge water backflow, and meanwhile, the anaerobic sludge flows to the aerobic section and the anoxic section, sludge with various functions does not respectively reside in the aerobic section and is difficult to independently play roles, and the efficiency of the whole anaerobic-anoxic-aerobic process is greatly reduced. Meanwhile, the mixing of three sections of sludge in the anaerobic section, the anoxic section and the aerobic section also causes that the sludge discharge period cannot be designed differently due to different biological compositions of each section, and the sludge in the anaerobic section, the anoxic section and the aerobic section cannot reach the optimal sludge age.
Disclosure of Invention
In order to make up for the defects, the invention provides the three-phase separator which is simple in structure and high in water-gas separation efficiency and can avoid mutual interference of sludge in the anaerobic section, the anoxic section and the aerobic section of the common biochemical tank.
The technical scheme adopted by the invention for solving the technical problem is as follows: a three-phase separator comprises a shell, a water falling weir, a water falling baffle plate, a water outlet pipe and a sludge return pipe, the shell is of a barrel structure with an upper end open and a lower end closed, the bottom surface of the shell is of a sharp bottom structure with a cross section gradually shrinking, at least one drop weir is fixedly arranged on the inner side wall of the opening part of the shell, at least one drop baffle is fixedly arranged on the inner side wall of the shell and is arranged in an inclined state, each drop baffle is positioned under the drop weir, sewage entering the shell through each drop weir falls to the surface of the drop baffle and then is bent at a set angle and flows into the bottom of the inner side of the shell, a water outlet pipe and a sludge return pipe are fixedly arranged on the shell, a water inlet of the water outlet pipe is positioned below the back of the drop baffle back to the direction of the drop weir, the height of the water inlet of the water outlet pipe is not higher than the height of the water surface in the shell, and a sludge inlet of the sludge return pipe is positioned at the sharp bottom end of the shell.
As a further improvement of the invention, the sludge return pipe is inserted into one section of the shell and penetrates through the shell along the width direction of the shell, and at least one sludge inlet is arranged on the circumferential outer side wall of the sludge return pipe at intervals along the axial direction of the sludge return pipe.
As a further improvement of the invention, the sludge inlet is positioned on the lower side surface of the sludge return pipe.
As a further improvement of the invention, the bottom surface of the shell comprises a first bottom plate and a second bottom plate, the lower ends of the first bottom plate and the second bottom plate are crossed and fixedly connected to form a V-shaped structure, and the inclination angle of the first bottom plate is smaller than that of the second bottom plate.
As a further improvement of the invention, a sludge deposition stop block in a convex state is fixedly arranged on the side wall of the lower end of the first bottom plate, a sludge deposition area is formed between the sludge deposition stop block and the second bottom plate, and the sludge return pipe is positioned in the sludge deposition area.
As a further improvement of the invention, the upper end of the sludge deposition block forms a plane which is jointed with the first bottom plate.
As a further improvement of the invention, the water falling weir is a triangular weir, a rectangular weir, a trapezoidal weir or a flat weir.
As a further improvement of the invention, the water-saving device is also provided with a water inlet groove, the water inlet groove is fixedly arranged on the inner side wall of the shell, the water inlet groove can be communicated with a reaction tank outside the shell, sewage in the reaction tank can enter the water inlet groove, and the water falling weir forms the side wall of the water outlet side of the water inlet groove.
As a further improvement of the invention, the side wall of the water inlet groove, which is far away from one side of the water falling weir, extends downwards from the bottom of the groove and is finally fixedly connected with the upper end of the water falling baffle plate to form an integral structure.
As a further improvement of the invention, the included angle between the water drop baffle and the horizontal plane is 15-75 degrees, the distance between the lower edge of the water drop baffle and the liquid level in the shell is not more than 10 centimeters, and the distance between the upper edge of the water drop baffle and the liquid level of the water drop weir is not less than 15 centimeters.
The beneficial technical effects of the invention are as follows: the invention utilizes the gravitational potential energy of the sewage to push the separation of the sludge, the water and the gas, and has simple structure and easy maintenance; the sludge quickly slides down to the top end of the bottom of the shell when impacting the wall of the shell in the cyclone area, and the effective backflow of the sludge is realized through the sludge backflow pipe, so that the problems of three-phase separation and sludge loss in the high-efficiency denitrification process are effectively solved; the invention can be used for a common activated sludge method, and the three-phase separator of the invention is respectively arranged in different areas in a biochemical tank, so that the problem of mutual interference of sludge in an anaerobic section, an anoxic section and an aerobic section of the common biochemical tank is avoided, the sludge discharge contradiction caused by different sludge age requirements of each process section can also be avoided, and the three-phase separator of the invention can realize independent sludge-water separation and sludge backflow of each process section without a sedimentation tank; the method has high sewage treatment efficiency, the single-stage 1m wide drop weir crest can treat the sewage more than 100m in a single day, and the single-stage 3m wide 6 parallel drop weir crest can treat the sewage more than 1800m in a single day.
Drawings
FIG. 1 is a schematic side sectional view of a single-stage drop weir according to the present invention;
FIG. 2 is a schematic diagram of a side-sectional structure of a multi-stage hydraulic weir according to the present invention;
FIG. 3 is a schematic view of the forward-cut structure of the multi-stage water-drop weir of the present invention;
fig. 4 is a schematic diagram of the three-phase separation principle of the invention using a multi-stage water-dropping weir.
Detailed Description
Example (b): a three-phase separator comprises a shell 1, a drop weir 2, drop baffles 3, a water outlet pipe 4 and a sludge return pipe 5, wherein the shell 1 is of a barrel structure with an upper end open and a lower end closed, the bottom surface of the shell 1 forms a pointed bottom structure with a gradually contracted cross section, at least one drop weir 2 is fixedly arranged on the inner side wall of the opening part of the shell 1, at least one drop baffle 3 is fixedly arranged on the inner side wall of the shell 1, the drop baffles 3 are arranged in an inclined state, each drop baffle 3 is positioned under the drop weir 2, sewage 6 entering the shell 1 through each drop weir 2 falls to the surface of the drop baffle 3 and then turns over a set angle and flows into the bottom of the inner side of the shell 1, the water outlet pipe 4 and the sludge return pipe 5 are fixedly arranged on the shell 1, the water inlet of the water outlet pipe is positioned under the back of the drop baffle 3 in the direction opposite to the drop weir 2, the water inlet of the water outlet pipe 4 is not higher than the water surface height in the shell 1, the sludge inlet 10 of the sludge return pipe 5 is positioned at the tip of the bottom surface of the shell 1.
When in use, the three-phase separator is placed in a filter tank, sewage 6 in the filter tank enters through a weir port of the water falling weir 2, the sewage 6 impacts the water falling baffle 3 at a certain speed by the gravitational potential energy flowing down from the port of the water falling weir 2, the sewage 6 is deflected to generate strong oscillation due to impact at the moment of impacting the water falling baffle 3, gas in the sewage 6 is separated from sludge and then separated from the sewage 6, the kinetic energy converted from the gravitational potential energy of the sewage 6 is not completely lost after the gas is separated from the sewage 6, the sewage enters the bottom of the shell 1 after being drained by the inclined water falling baffle 3, a cyclone area 7 is formed at the bottom of the shell 1, the sewage 6 generates cyclone flow around a horizontal axis in the cyclone area, the sludge 8 is slightly greater than the density of the water and is thrown to the wall of the shell 1 by centrifugal force, and then slowly slides to the lowest position at the top of the bottom of the shell 1 due to form a sludge deposition area 9, and finally, the sludge is pumped out by a sludge return pipe 5 to complete sludge-water separation.
The three-phase separation structure promotes the separation of sludge, water and gas by the gravitational potential energy of the sewage 6, has simple structure and easy maintenance, can be applied to the tail end of each section of the anaerobic section, the anoxic section and the aerobic section in the common activated sludge method, independently collects and reflows the sludge of each section, avoids the mutual interference of the sludge of the anaerobic section, the anoxic section and the aerobic section, can realize the independent sludge-water separation and sludge reflow of each process section without a sedimentation tank, and has high sewage treatment efficiency of 6.
The shell 1, the water falling weir 2 and the water falling baffle 3 can be made of one or more of stainless steel, carbon steel, PP, PVC, UPVC, acrylic and other materials, and can also be made of other materials.
Drop weir 2 of this three-phase separator can be single-stage weir, also can be that multistage weir is parallelly connected, and single-stage weir is used for little water yield, and multistage weir is parallelly connected and is used for big water yield, and single-stage 1m wide drop weir 2 single day can handle sewage more than the year 100m, and 3m wide 6 parallelly connected drop weir 2 single day can handle sewage more than the year 1800 m.
The sludge return pipe 5 is inserted into one section of the shell 1 and penetrates through the shell 1 along the width direction of the shell 1, and at least one sludge inlet 10 is axially arranged on the outer circumferential side wall of the sludge return pipe 5 at intervals along the sludge return pipe 5. The structure can realize uniform and quick extraction of the sludge and avoid sludge accumulation.
The sludge inlet 10 is positioned on the lower side surface of the sludge return pipe 5, which is beneficial to thoroughly emptying the sludge at the bottom of the shell 1.
The bottom surface of the shell 1 comprises a first bottom plate 11 and a second bottom plate 12, the lower ends of the first bottom plate 11 and the second bottom plate 12 are crossed and fixedly connected to form a V-shaped structure, and the inclination angle of the first bottom plate 11 is smaller than that of the second bottom plate 12.
A cyclone area is formed above the first bottom plate 11, and the first bottom plate 11 and the second bottom plate 12 jointly form a pointed bottom for gathering sludge.
A sludge deposition stop block 13 in a convex state is fixedly arranged on the side wall of the lower end of the first bottom plate 11, a sludge deposition area is formed between the sludge deposition stop block 13 and the second bottom plate 12, and the sludge return pipe 5 is positioned in the sludge deposition area. The sludge slides down rapidly along the first bottom plate 11, reaches the position of the sludge deposition stop block 13, is stopped by the sludge deposition stop block 13 to be decelerated, and finally is gathered at the tip of the lower end of the bottom plate of the shell 1.
Sludge deposit dog 13 upper end forms the plane that links up with first bottom plate 11, and there is certain contained angle in this plane best and level, forms the state of slope down slightly, and above-mentioned structure is convenient for when mud slows down, can not block mud, and sludge deposit dog 13 forms vertical face of longitudinal extension towards second bottom plate 12 one side for mud falls fast behind sludge deposit dog 13, is convenient for carry out even gathering at the bottom plate point.
The water falling weir 2 is a triangular weir, a rectangular weir, a trapezoidal weir or a flat weir.
Still be equipped with intake antrum 14, intake antrum 14 fixed mounting is on the 1 inside wall of shell, and intake antrum 14 can communicate with the outside reaction tank of shell 1, and in sewage 6 can get into intake antrum 14 in the reaction tank, fall weir 2 and form the lateral wall of the 14 play water sides of intake antrum. The water inlet groove 14 is used for the condition that the multistage weirs are connected in parallel, sewage 6 on the side edge of the shell 1 of the three-phase separator in the filter tank directly enters through the water falling weir 2 on the edge, sewage 6 on other parts firstly enters the water inlet groove 14, and sewage 6 in the water inlet groove 14 enters the shell 1 through the water falling weir 2 on the water falling groove, so that the effect of synchronously separating water and air by the multistage weirs in parallel is achieved.
The side wall of the water inlet groove 14, which is far away from one side of the water falling weir 2, extends downwards from the groove bottom and is finally fixedly connected with the upper end of the water falling baffle 3 to form an integral structure. This structure is favorable to improving the installation intensity of drop baffle 3, and does benefit to drop baffle 3 just to setting up to drop weir 2 for the sewage 6 that drop weir 2 got into accurately falls on drop baffle 3.
The included angle between the water drop baffle 3 and the horizontal plane is 15-75 degrees, the distance between the lower edge of the water drop baffle 3 and the liquid level in the shell 1 is not more than 10 centimeters, and the distance between the upper edge of the water drop baffle 3 and the liquid level of the water drop weir 2 is not less than 15 centimeters.

Claims (9)

1. A three-phase separator, characterized by: the device comprises a shell (1), drop weirs (2), drop baffles (3), a water outlet pipe (4) and a sludge return pipe (5), wherein the shell (1) is of a barrel structure with an upper end open and a lower end closed, the bottom surface of the shell (1) forms a pointed bottom structure with a gradually contracted cross section, at least one drop weir (2) is fixedly arranged on the inner side wall of the opening part of the shell (1) at intervals, at least one drop baffle (3) is fixedly arranged on the inner side wall of the shell (1), the drop baffles (3) are arranged in an inclined state, the included angle between each drop baffle (3) and the horizontal plane is 15-75 degrees, each drop baffle (3) is positioned under the drop weir (2), the distance between the lower edge of each drop baffle (3) and the liquid level in the shell (1) is not more than 10 centimeters, the distance between the upper edge of each drop baffle (3) and the liquid level of the drop weir (2) is not less than 15 centimeters, when the sewage treatment device is used, the three-phase separator is placed in the filter tank, the sewage (6) in the filter tank enters through a weir port of the water falling weir (2), the sewage (6) flows down from the port of the water falling weir (2) to enable the sewage (6) to impact the water falling weir (3) at a certain speed by the gravity potential energy generated by the sewage (6) flowing down from the port of the water falling weir (2), and the sewage (6) impacts the water falling weir (3) at the moment of impacting the water falling weir (3) to generate strong vibration and turns direction, the sewage treatment device has the advantages that gas in the sewage (6) is enabled to be separated from the sewage (6) after being separated from the sewage (6), kinetic energy obtained by converting the sewage (6) from gravitational potential energy is not completely lost, the gas is drained by the inclined water dropping baffle (3) and enters the bottom of the shell (1), a cyclone area (7) is formed at the bottom of the shell (1), the sewage (6) generates cyclone around a horizontal axis in the cyclone area, the sludge (8) is thrown to the wall of the shell (1) by centrifugal force, and then slowly slides to the lowest position of the top end of the bottom of the shell (1) due to the inclination of the bottom of the shell (1), a sludge deposition area (9) is formed at the position, and the sludge is finally pumped out by the sludge backflow pipe (5) to complete sludge-water separation.
2. The three-phase separator according to claim 1, characterized in that: the sludge return pipe (5) is inserted into one section of the shell (1) and penetrates through the shell (1) along the width direction of the shell (1), and at least one sludge inlet (10) is axially arranged on the circumferential outer side wall of the sludge return pipe (5) at intervals along the sludge return pipe (5).
3. A three-phase separator according to claim 2, wherein: the sludge inlet (10) is positioned on the lower side surface of the sludge return pipe (5).
4. The three-phase separator according to claim 1, characterized in that: the bottom surface of the shell (1) comprises a first bottom plate (11) and a second bottom plate (12), the lower ends of the first bottom plate (11) and the second bottom plate (12) are crossed and fixedly connected to form a V-shaped structure, and the inclination angle of the first bottom plate (11) is smaller than that of the second bottom plate (12).
5. The three-phase separator according to claim 4, characterized in that: a sludge deposition stop block (13) in a convex state is fixedly installed on the side wall of the lower end of the first bottom plate (11), a sludge deposition area is formed between the sludge deposition stop block (13) and the second bottom plate (12), and the sludge return pipe (5) is located in the sludge deposition area.
6. The three-phase separator according to claim 5, characterized in that: the upper end of the sludge deposition baffle block (13) forms a plane which is jointed with the first bottom plate (11).
7. The three-phase separator according to claim 1, characterized in that: the water falling weir (2) is a triangular weir, a rectangular weir, a trapezoidal weir or a flat weir.
8. The three-phase separator according to claim 1, characterized in that: still be equipped with intake antrum (14), intake antrum (14) fixed mounting is on shell (1) inside wall, intake antrum (14) can with the outside filtering ponds intercommunication of shell (1), in sewage (6) can get into intake antrum (14) in the filtering ponds, fall weir (2) and form the lateral wall of intake antrum (14) play water side.
9. The three-phase separator according to claim 8, wherein: the side wall of one side of the water inlet groove (14) far away from the water falling weir (2) extends downwards from the groove bottom and is finally fixedly connected with the upper end of the water falling baffle (3) to form an integral structure.
CN202110730910.5A 2021-06-30 2021-06-30 Three-phase separator Active CN113184942B (en)

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101613153A (en) * 2009-08-06 2009-12-30 上海天丰环保有限公司 A kind of vertical anaerobic process tank integrated triphase separator
CN102267751A (en) * 2010-10-26 2011-12-07 苏木清 Rapid precipitation and concentration tank for tailing sewage
CN103288229A (en) * 2013-05-30 2013-09-11 欧基(上海)环保科技有限公司 Precipitation device for three-phase sewage separation
CN203333327U (en) * 2013-06-17 2013-12-11 国家城市给水排水工程技术研究中心 Flat plate type returned sludge sewage-blocking grid and squeezing and dehydration integrated device
CN106492520A (en) * 2016-12-06 2017-03-15 沈阳农业大学 A kind of girt-water separation device and method
CN108328726A (en) * 2018-01-24 2018-07-27 同济大学 A kind of circulating EGSB reaction units and the sewage water treatment method based on the device
CN109160604A (en) * 2018-10-25 2019-01-08 青岛理工大学 A kind of composite three-phase separator
CN208632149U (en) * 2018-07-13 2019-03-22 苏州新工环境工程技术有限公司 Total travel scrapes slag air bearing all-in-one machine
CN209778604U (en) * 2019-02-25 2019-12-13 大连大开污水处理有限公司 Multifunctional sludge discharging device with constant sludge concentration and properties
CN110723865A (en) * 2019-09-03 2020-01-24 湖北沃特尔股份有限公司 Combined treatment process for landfill leachate combined system
CN210367143U (en) * 2019-08-09 2020-04-21 上海庞科环境技术有限公司 Double-channel three-phase separator, three-phase separation system and anaerobic reactor
CN212236337U (en) * 2020-04-14 2020-12-29 陕西耕禾节能环保技术有限公司 Domestic sewage treatment device convenient to dismantle clearance
CN112645442A (en) * 2019-10-12 2021-04-13 帕克环保技术(上海)有限公司 Three-phase separator

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101613153A (en) * 2009-08-06 2009-12-30 上海天丰环保有限公司 A kind of vertical anaerobic process tank integrated triphase separator
CN102267751A (en) * 2010-10-26 2011-12-07 苏木清 Rapid precipitation and concentration tank for tailing sewage
CN103288229A (en) * 2013-05-30 2013-09-11 欧基(上海)环保科技有限公司 Precipitation device for three-phase sewage separation
CN203333327U (en) * 2013-06-17 2013-12-11 国家城市给水排水工程技术研究中心 Flat plate type returned sludge sewage-blocking grid and squeezing and dehydration integrated device
CN106492520A (en) * 2016-12-06 2017-03-15 沈阳农业大学 A kind of girt-water separation device and method
CN108328726A (en) * 2018-01-24 2018-07-27 同济大学 A kind of circulating EGSB reaction units and the sewage water treatment method based on the device
CN208632149U (en) * 2018-07-13 2019-03-22 苏州新工环境工程技术有限公司 Total travel scrapes slag air bearing all-in-one machine
CN109160604A (en) * 2018-10-25 2019-01-08 青岛理工大学 A kind of composite three-phase separator
CN209778604U (en) * 2019-02-25 2019-12-13 大连大开污水处理有限公司 Multifunctional sludge discharging device with constant sludge concentration and properties
CN210367143U (en) * 2019-08-09 2020-04-21 上海庞科环境技术有限公司 Double-channel three-phase separator, three-phase separation system and anaerobic reactor
CN110723865A (en) * 2019-09-03 2020-01-24 湖北沃特尔股份有限公司 Combined treatment process for landfill leachate combined system
CN112645442A (en) * 2019-10-12 2021-04-13 帕克环保技术(上海)有限公司 Three-phase separator
CN212236337U (en) * 2020-04-14 2020-12-29 陕西耕禾节能环保技术有限公司 Domestic sewage treatment device convenient to dismantle clearance

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