CN211688687U - Phosphorus nitrogen treatment device in waste water of lake silt - Google Patents
Phosphorus nitrogen treatment device in waste water of lake silt Download PDFInfo
- Publication number
- CN211688687U CN211688687U CN201921496181.6U CN201921496181U CN211688687U CN 211688687 U CN211688687 U CN 211688687U CN 201921496181 U CN201921496181 U CN 201921496181U CN 211688687 U CN211688687 U CN 211688687U
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- Prior art keywords
- sedimentation tank
- tank
- reaction tank
- reaction
- sedimentation
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Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 43
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 97
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 238000005086 pumping Methods 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 239000011574 phosphorus Substances 0.000 claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003818 cinder Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 27
- 238000004065 wastewater treatment Methods 0.000 abstract description 9
- 230000001580 bacterial effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 206010021143 Hypoxia Diseases 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 239000013049 sediment Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000000645 desinfectant Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 240000007817 Olea europaea Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000002897 organic nitrogen compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- -1 phosphorus compound Chemical class 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model discloses a phosphorus nitrogen treatment device in waste water of lake silt, including first sedimentation tank, the left surface of first sedimentation tank is provided with the reaction tank, the left surface of reaction tank is provided with the second sedimentation tank, the left surface of second sedimentation tank is provided with the disinfection pond, first sedimentation tank and reaction tank, reaction tank and second sedimentation tank, all be provided with conveying mechanism between second sedimentation tank and the disinfection pond, conveying mechanism comprises material pump and material pipe, all be provided with rabbling mechanism on reaction tank and the second sedimentation tank, rabbling mechanism is by a motor, a pivot and a plurality of stirring fan blade are constituteed. The utility model discloses a set up vacuum pump and air-blower and can form oxygen deficiency or good oxygen environment in the reaction tank inside to provide corresponding environment for the reaction of waste water treatment bacterial, and can make waste water and handle bacterial and reagent misce bene through setting up motor, pivot and stirring fan blade, thereby improve the treatment effect of phosphorus nitrogen.
Description
Technical Field
The utility model relates to a phosphorus nitrogen treatment device specifically is a phosphorus nitrogen treatment device in the waste water of lake silt.
Background
Lake sludge is sludge formed by the combination of lake sediments, is a composition body containing inorganic substances and organic substance particles, is usually in a brown color with different shades from gray, black, olive and black, contains a large amount of phosphate and organic nitrogen compounds in waste water of the lake sludge, and if the substances are not treated, the substances can not only cause excessive growth of algae in the lake, but also consume oxygen in the water, thereby influencing the growth of fishes in the lake and even leading to the death of fishes and some microorganisms. Therefore, we improve the method and provide a device for treating phosphorus and nitrogen in the wastewater of lake sludge.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a following technical scheme:
the utility model relates to a treatment device for phosphorus and nitrogen in wastewater of lake sludge, which comprises a first sedimentation tank, wherein a reaction tank is arranged on the left side surface of the first sedimentation tank, a second sedimentation tank is arranged on the left side surface of the reaction tank, a disinfection tank is arranged on the left side surface of the second sedimentation tank, conveying mechanisms are arranged among the first sedimentation tank, the reaction tank, the second sedimentation tank, the disinfection tank, the conveying mechanisms are composed of a material pumping pump and a material pumping pipe, stirring mechanisms are arranged on the reaction tank and the second sedimentation tank, each stirring mechanism is composed of a motor, a rotating shaft and a plurality of stirring blades, a vacuum pump and an air blower positioned on the right side of the vacuum pump are arranged at the top of the reaction tank, a slag discharging mechanism is arranged on one side of the first sedimentation tank and one side of the second sedimentation tank, and consists of a slag discharging pipe and a baffle plate, one side at reaction tank, second sedimentation tank and disinfection pond top all is provided with the filling tube, and is three the filling tube is provided with the valve respectively with the junction in reaction tank, second sedimentation tank and disinfection pond.
As an optimal technical scheme of the utility model, the one end of drawing material pipe and the fixed intercommunication of outlet pipe of drawing material pump, it is three the inlet tube of drawing material pump communicates with first sedimentation tank, reaction tank and second sedimentation tank are fixed respectively, and is three the one end that the drawing material pipe kept away from the drawing material pump communicates with disinfection pond, second sedimentation tank and reaction tank are fixed respectively, and is three the middle part of drawing material pipe all is provided with the valve.
As a preferred technical scheme of the utility model, two the bottom of motor respectively with reaction tank and second sedimentation tank fixed connection, two the output shaft of motor extend to the inside of reaction tank and second sedimentation tank respectively and respectively with two pivot fixed connection, a plurality of stirring fan blade all sets up the surface in the pivot.
As an optimal technical scheme of the utility model, the intake pipe of vacuum pump and the outlet duct of air-blower all with the fixed intercommunication of reaction tank, the intake pipe of vacuum pump and the outlet duct of air-blower all are provided with the valve with the junction of reaction tank.
As an optimal technical scheme of the utility model, two the scum pipe respectively with the fixed intercommunication in bottom of first sedimentation tank and second sedimentation tank one side, two the baffle alternates respectively to be connected at the middle part of two scum pipes.
As an optimal technical scheme of the utility model, material pump, motor, vacuum pump and air-blower are all external to have control switch, control switch and external power supply electric connection.
As an optimal technical scheme of the utility model, one side that the second sedimentation tank was kept away from in the disinfection pond is provided with the drain pipe, the middle part of drain pipe is provided with the valve, the bottom of first sedimentation tank, reaction tank and second sedimentation tank all is provided with the support frame.
The utility model has the advantages that: this kind of phosphorus nitrogen processing apparatus in lake silt's waste water, carry out preliminary sedimentation to waste water through first sedimentation tank, water after the sediment lets in the reaction tank under the effect of suction pump and suction pipe, add microbial srain in the reaction tank then carry out anaerobism and aerobic reaction to waste water, waste water after the reaction lets in the second sedimentation tank under the effect of suction pump and suction pipe, then add denitrogenation dephosphorization agent in the second sedimentation tank and make nitrogen, phosphorus compound in the waste water inside the second sedimentation tank form the flocculation thing and deposit, waste water inside the second sedimentation tank is let in the disinfection tank by suction pump and suction pipe at last, add disinfectant to the disinfection tank inside and discharge by the filling tube after disinfecting waste water, thereby realize the processing to phosphorus nitrogen in the waste water, the utility model discloses a set up vacuum pump and air-blower and can form oxygen deficiency or aerobic environment in the reaction tank, thereby provide corresponding environment for the reaction of waste water treatment bacterial, and through setting up motor, pivot and stirring fan blade can make waste water and handle bacterial and reagent misce bene to improve the treatment effect of phosphorus nitrogen.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a device for treating phosphorus and nitrogen in wastewater of lake sludge according to the present invention;
FIG. 2 is a schematic structural view of a reaction tank of a device for treating phosphorus and nitrogen in wastewater of lake sludge according to the present invention;
FIG. 3 is a schematic structural diagram of a stirring mechanism of a device for treating phosphorus and nitrogen in wastewater of lake sludge.
In the figure: 1. a first sedimentation tank; 2. a reaction tank; 3. a second sedimentation tank; 4. a disinfection tank; 5. a material pumping pump; 6. a material pumping pipe; 7. a feed tube; 8. a motor; 9. a rotating shaft; 10. a stirring fan blade; 11. a vacuum pump; 12. a blower; 13. a slag discharge pipe; 14. a baffle plate; 15. a support frame; 16. and a water discharge pipe.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Example (b): as shown in figures 1, 2 and 3, the device for treating phosphorus and nitrogen in wastewater of lake sludge of the present invention comprises a first sedimentation tank 1, a reaction tank 2 is arranged on the left side of the first sedimentation tank 1, a second sedimentation tank 3 is arranged on the left side of the reaction tank 2, a disinfection tank 4 is arranged on the left side of the second sedimentation tank 3, a conveying mechanism is arranged between the first sedimentation tank 1 and the reaction tank 2, the reaction tank 2 and the second sedimentation tank 3, and between the second sedimentation tank 3 and the disinfection tank 4, the conveying mechanism is composed of a material pumping pump 5 and a material pumping pipe 6, a stirring mechanism is arranged on the reaction tank 2 and the second sedimentation tank 3, the stirring mechanism is composed of a motor 8, a rotating shaft 9 and a plurality of stirring fan blades 10, a vacuum pump 11 and a dust removing mechanism 12 positioned on the right side of the vacuum pump 11 are arranged on the top of the reaction tank 2, and one side of the first sedimentation tank 1 and the second sedimentation tank 3 are both provided with a dust removing mechanism, the slag discharging mechanism consists of a slag discharging pipe 13 and a baffle 14, one side of the top of each of the reaction tank 2, the second sedimentation tank 3 and the disinfection tank 4 is provided with a feeding pipe 7, and the joints of the three feeding pipes 7 with the reaction tank 2, the second sedimentation tank 3 and the disinfection tank 4 are respectively provided with a valve.
Wherein, the one end of drawing material pipe 6 and the fixed intercommunication of outlet pipe of drawing material pump 5, the inlet tube of three drawing material pump 5 respectively with first sedimentation tank 1, reaction tank 2 and the fixed intercommunication of second sedimentation tank 3, the one end that drawing material pump 5 was kept away from to three drawing material pipe 6 respectively with disinfection pond 4, the fixed intercommunication of second sedimentation tank 3 and reaction tank 2, the middle part of three drawing material pipe 6 all is provided with the valve, can realize first sedimentation tank 1 and reaction tank 2 through setting up drawing material pump 5 and drawing material pipe 6, reaction tank 2 and second sedimentation tank 3, the liquid transport between second sedimentation tank 3 and the disinfection pond 4.
Wherein, two motors 8's bottom respectively with reaction tank 2 and 3 fixed connection of second sedimentation tank, two motors 8's output shaft extend to reaction tank 2 and 3 inside of second sedimentation tank respectively and respectively with two pivot 9 fixed connection, a plurality of stirring fan blade 10 all sets up at the surface of pivot 9, can make waste water and processing bacterial and reagent misce bene through setting up motor 8, pivot 9 and stirring fan blade 10 to improve the treatment effect of phosphorus nitrogen.
Wherein, the intake pipe of vacuum pump 11 and the outlet duct of air-blower 12 all with the fixed intercommunication of reaction tank 2, the intake pipe of vacuum pump 11 and the outlet duct of air-blower 12 all are provided with the valve with the junction of reaction tank 2, can form oxygen deficiency or aerobic environment in reaction tank 2 inside through setting up vacuum pump 11 and air-blower 12 to reaction for the waste water treatment bacterial provides corresponding environment.
Wherein, two row's sediment pipes 13 respectively with the fixed intercommunication in bottom of first sedimentation tank 1 and 3 one sides of second sedimentation tank, two baffles 14 alternate respectively and connect and can play the shutoff effect to row's sediment pipe 13 through setting up baffle 14 at the middle part of two row's sediment pipes 13, upwards promote baffle 14 after the processing is accomplished and can make the precipitate discharge by row's sediment pipe 13.
Wherein, the material pump 5, motor 8, vacuum pump 11 and blower 12 all are external to have control switch, control switch and external power supply electric connection, and the applicable signal of material pump 5 is 100ZW100-30 type material pump, and the applicable model of motor 8 is Y0100L2-4 type motor, and the applicable model of vacuum pump 11 is 2XZ-4 type vacuum pump, and the applicable model of blower 12 is TB-125 type blower.
Wherein, the one side that second sedimentation tank 3 was kept away from to disinfection pond 4 is provided with drain pipe 16, and the middle part of drain pipe 16 is provided with the valve, and the bottom of first sedimentation tank 1, reaction tank 2 and second sedimentation tank 3 all is provided with support frame 15, can play the supporting role to first sedimentation tank 1, reaction tank 2 and second sedimentation tank 3 through setting up support frame 15.
When the anaerobic type wastewater treatment device works, firstly, wastewater is introduced into the first sedimentation tank 1, substances in the wastewater are precipitated in the first sedimentation tank 1, the precipitated wastewater is introduced into the reaction tank 2 through the pumping pump 5 and the pumping pipe 6 between the first sedimentation tank 1 and the reaction tank 2, then anaerobic type wastewater treatment strains are added into the reaction tank 2 through the feeding pipe 7 on the reaction tank 2, then the pumping pipe 6, the air blower 12 and valves on the feeding pipe 7 are closed, the rotating shaft 9 and the stirring fan blades 10 are driven by the motor 8 to stir the interior of the reaction tank 2, the anaerobic type wastewater treatment strains and the wastewater are uniformly mixed, air in the reaction tank 2 is discharged through the vacuum pump 11, the valve at the joint of the vacuum pump 11 and the reaction tank 2 is closed after the discharge is finished, the valves on the pumping pipe 6, the air blower 12, the feeding pipe 7 and the vacuum pump 11 are opened after the anaerobic type wastewater treatment strains treat the wastewater, and aerobic type wastewater is added into the reaction tank 2 through the feeding pipe 7 Treating strains, blowing air into the reaction tank 2 by an air blower 12, increasing the air circulation speed in the reaction tank 2 so as to ensure the oxygen content in the reaction tank 2, driving a rotating shaft 9 and stirring blades 10 by a motor 8 to stir the interior of the reaction tank 2 and uniformly mix aerobic wastewater treatment strains with wastewater, introducing the wastewater in the reaction tank 2 into a second sedimentation tank 3 by a pumping pump 5 and a pumping pipe 6 after the wastewater is treated by the aerobic wastewater treatment strains, adding a nitrogen and phosphorus removal agent into the second sedimentation tank 3 by a feeding pipe 7 on the second sedimentation tank 3, driving the rotating shaft 9 and the stirring blades 10 by the motor 8 to stir the interior of the second sedimentation tank 3 and uniformly mix the nitrogen and phosphorus removal agent with the wastewater, and enabling nitrogen and phosphorus compounds in the wastewater in the second sedimentation tank 3 to form flocs and precipitate the flocs by the nitrogen and phosphorus removal agent, then through material pumping pump 5 and pump-out pipe 6 with the inside waste water after deposiing of second sedimentation tank 3 let in disinfection pond 4 in, disinfect waste water to disinfection pond 4 inside addition disinfectant through filling tube 7 on the disinfection pond 4, the waste water after the disinfection is discharged by drain pipe 16, at last upwards lift pull baffle 14 make first sedimentation tank 1 and the inside precipitate of second sedimentation tank 3 discharge by row sediment pipe 13 can.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a phosphorus nitrogen processing apparatus in waste water of lake silt, includes first sedimentation tank (1), its characterized in that, the left surface of first sedimentation tank (1) is provided with reaction tank (2), the left surface of reaction tank (2) is provided with second sedimentation tank (3), the left surface of second sedimentation tank (3) is provided with disinfection pond (4), all be provided with conveying mechanism between first sedimentation tank (1) and reaction tank (2), reaction tank (2) and second sedimentation tank (3), second sedimentation tank (3) and disinfection pond (4), conveying mechanism comprises pump (5) and pumping pipe (6), all be provided with rabbling mechanism on reaction tank (2) and second sedimentation tank (3), rabbling mechanism comprises a motor (8), a pivot (9) and a plurality of stirring fan blade (10), the top of reaction tank (2) is provided with vacuum pump (11) and is located the air-blower on vacuum pump (11) right side (12) The utility model discloses a disinfection device, one side of first sedimentation tank (1) and second sedimentation tank (3) all is provided with slag extractor constructs, slag extractor constructs by row's cinder pipe (13) and baffle (14) are constituteed, one side at reaction tank (2), second sedimentation tank (3) and disinfection pond (4) top all is provided with filling tube (7), and is three filling tube (7) are provided with the valve respectively with the junction of reaction tank (2), second sedimentation tank (3) and disinfection pond (4).
2. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein one end of the pumping pipe (6) is fixedly communicated with a water outlet pipe of a pumping pump (5), water inlet pipes of three pumping pumps (5) are respectively and fixedly communicated with a first sedimentation tank (1), a reaction tank (2) and a second sedimentation tank (3), one ends of the three pumping pipes (6) far away from the pumping pump (5) are respectively and fixedly communicated with a disinfection tank (4), the second sedimentation tank (3) and the reaction tank (2), and valves are arranged in the middle parts of the three pumping pipes (6).
3. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein the bottoms of the two motors (8) are respectively and fixedly connected with the reaction tank (2) and the second sedimentation tank (3), the output shafts of the two motors (8) respectively extend into the reaction tank (2) and the second sedimentation tank (3) and are respectively and fixedly connected with the two rotating shafts (9), and the stirring blades (10) are arranged on the outer surfaces of the rotating shafts (9).
4. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein the air inlet pipe of the vacuum pump (11) and the air outlet pipe of the blower (12) are both fixedly communicated with the reaction tank (2), and valves are arranged at the joints of the air inlet pipe of the vacuum pump (11) and the air outlet pipe of the blower (12) and the reaction tank (2).
5. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein the two slag discharge pipes (13) are respectively and fixedly communicated with the bottoms of one sides of the first sedimentation tank (1) and the second sedimentation tank (3), and the two baffles (14) are respectively and alternately connected to the middle parts of the two slag discharge pipes (13).
6. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein the pump (5), the motor (8), the vacuum pump (11) and the blower (12) are all externally connected with control switches, and the control switches are electrically connected with an external power supply.
7. The device for treating phosphorus and nitrogen in wastewater of lake sludge according to claim 1, wherein a drain pipe (16) is arranged on one side of the disinfection tank (4) far away from the second sedimentation tank (3), a valve is arranged in the middle of the drain pipe (16), and support frames (15) are arranged at the bottoms of the first sedimentation tank (1), the reaction tank (2) and the second sedimentation tank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921496181.6U CN211688687U (en) | 2019-09-10 | 2019-09-10 | Phosphorus nitrogen treatment device in waste water of lake silt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921496181.6U CN211688687U (en) | 2019-09-10 | 2019-09-10 | Phosphorus nitrogen treatment device in waste water of lake silt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211688687U true CN211688687U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921496181.6U Expired - Fee Related CN211688687U (en) | 2019-09-10 | 2019-09-10 | Phosphorus nitrogen treatment device in waste water of lake silt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211688687U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716755A (en) * | 2021-09-17 | 2021-11-30 | 苏州翔展环保工程有限公司 | Multistage wastewater treatment device |
-
2019
- 2019-09-10 CN CN201921496181.6U patent/CN211688687U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716755A (en) * | 2021-09-17 | 2021-11-30 | 苏州翔展环保工程有限公司 | Multistage wastewater treatment device |
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