CN111204953A - Cavitation air flotation equipment for sludge concentration and treatment process - Google Patents
Cavitation air flotation equipment for sludge concentration and treatment process Download PDFInfo
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- CN111204953A CN111204953A CN201910256629.5A CN201910256629A CN111204953A CN 111204953 A CN111204953 A CN 111204953A CN 201910256629 A CN201910256629 A CN 201910256629A CN 111204953 A CN111204953 A CN 111204953A
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- air flotation
- tank
- cavitation air
- cavitation
- sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 73
- 238000005188 flotation Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005345 coagulation Methods 0.000 claims abstract description 36
- 230000015271 coagulation Effects 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000005273 aeration Methods 0.000 claims abstract description 30
- 239000002893 slag Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000005276 aerator Methods 0.000 claims abstract description 18
- 239000004088 foaming agent Substances 0.000 claims abstract description 17
- 238000007790 scraping Methods 0.000 claims abstract description 15
- 238000010992 reflux Methods 0.000 claims abstract description 11
- 239000008394 flocculating agent Substances 0.000 claims abstract description 8
- 239000003344 environmental pollutant Substances 0.000 claims description 13
- 231100000719 pollutant Toxicity 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 10
- 239000010865 sewage Substances 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 5
- 230000001112 coagulating effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 206010013496 Disturbance in attention Diseases 0.000 description 1
- -1 at the moment Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
Abstract
A cavitation air flotation device and a treatment process for sludge concentration comprise: the device comprises a coagulation reaction tank and a cavitation air flotation tank, wherein the coagulation reaction tank is provided with a foaming agent feeding port and a stirrer, an outlet of the coagulation reaction tank is connected with an inlet of the cavitation air flotation tank through a pipeline, an aeration chamber is arranged at the front end of the cavitation air flotation tank, a flocculating agent feeding port is arranged on the pipeline entering an inlet of the aeration chamber, a cavitation aerator is arranged in the aeration chamber, a reflux device, a slag scraping device, a mud discharging hopper, a scum collecting tank, a spiral slag discharging device, a discharging port and an adjustable overflow weir plate and a water outlet are arranged in the cavitation air flotation tank, and the process comprises coagulation treatment and cavitation air flotation, slag scraping, slag discharging, clear liquid and external discharge. The invention has the advantages of simple process flow, strong process adaptability, high treatment efficiency, small occupied area, stable operation, safety, reliability, low energy consumption, high automation degree, continuous operation, no odor overflow and the like in the sludge concentration process.
Description
Technical Field
The invention relates to environment-friendly equipment and a treatment process, in particular to cavitation air flotation equipment for sludge concentration and a treatment process.
Background
Sludge concentration is the primary process of sludge treatment, the prior commonly used sludge concentration adopts gravity concentration and mechanical concentration, the gravity concentration has the advantages of low maintenance management and power cost, large occupied area, poor sanitary condition and poor concentration effect, can not effectively remove water in the sludge, and because the sludge stays in a gravity concentration tank for a long time, an anaerobic environment is formed in the concentration tank, the phosphorus-rich sludge releases phosphorus in the concentration, so that the phosphorus removal effect of the whole system is poor, the use is limited, and the sludge is gradually replaced in a sewage treatment plant. The centrifugal equipment is one of mechanical concentration, has a series of advantages of simple process flow, strong process adaptability, high automation degree, continuous operation, strong process adjustability and the like when being used for sludge concentration, but has the defects of high investment cost, high operation cost and the like when being used for sludge pretreatment, and is not widely accepted.
Disclosure of Invention
The invention aims to provide cavitation air flotation equipment for sludge concentration and a treatment process aiming at the defects in the prior art and the requirements of energy conservation and environmental protection of users. The apparatus of the present invention comprises: the device comprises a coagulation reaction tank and a cavitation air floating tank, and is characterized in that the coagulation reaction tank and the cavitation air floating tank are normal-pressure containers, and are made of carbon steel or stainless steel or concrete subjected to anti-corrosion treatment. The feed inlet of the coagulation reaction tank is connected with a lift pump, the residual sludge at the bottom of the secondary sedimentation tank of the previous procedure is lifted by the lift pump to enter the feed inlet of the coagulation reaction tank, the coagulation reaction tank is provided with a foaming agent adding port, and a stirrer is arranged in the coagulation reaction tank. Adding the foaming agent through an adding port of the foaming agent. And (3) coagulating the small-particle sludge in the feeding material to form larger-particle sludge under the action of a stirrer in the coagulation reaction tank. The outlet of the coagulation reaction tank is connected with the inlet of the cavitation air floating tank through a pipeline. The front end of the cavitation air-floating groove is provided with an aeration chamber, and a pipeline entering the inlet of the aeration chamber is provided with a flocculating agent feeding port. A vortex concave aerator is arranged in the aeration chamber. In the operation process, the hollow impeller at the bottom of the vortex concave aerator rotates fast to form a vacuum area in water, at the moment, air above the vacuum area is pumped to the bottom of the aeration chamber through the hollow pipeline, the impeller at the bottom of the vortex concave aerator rotates fast to generate three strands of shearing force to crush the air into micro bubbles, and the micro bubbles are organically combined with solid pollutants in feed sludge and rise to the liquid level. The aeration chamber bottom is equipped with the reflux unit who comprises several back flows, because the high-speed rotation of cavitation aeration machine forms the vacuum zone in the aeration chamber and produces little negative pressure, and cavitation air supporting groove bottom rivers receive the negative pressure effect, and the waste water that will still not fully react inhales the aeration chamber from the back flow of cavitation air supporting groove bottom, realizes that the secondary cycle of the pollutant that sinks gets rid of. The top of the cavitation air flotation tank is provided with a slag scraping device driven by a motor, and the lower part of the slag scraping device is provided with a scum collecting tank, a spiral slag discharging device and a discharging port. The slag scraping device is made of stainless steel, rubber, high polymer and other materials. The concentrated sludge entering the spiral slag discharging device is conveyed to a subsequent process by the spiral slag discharging device for dehydration, and a sludge discharge hopper is arranged at the bottom of the cavitation air flotation tank and used for depositing sludge with higher density and discharging the sludge periodically. The back end of the cavitation air flotation groove is provided with an adjustable overflow weir plate and a water outlet, and clear liquid separated by solid-liquid moves forwards by gravity and flows to the adjustable overflow weir plate at the back end from the cavitation air flotation groove to be discharged. The water outlet is connected with an adjusting tank of the sewage treatment system through a pipeline.
The cavitation aerator is vertically arranged in the aeration chamber, and a hollow impeller is arranged at the bottom of the cavitation aerator.
The adjustable overflow weir plate is adjusted by a hand wheel or automatically adjusted. The liquid level height of the overflow weir plate can be adjusted by adjusting the concentration and the amount of the treated sludge.
And waste gas overflowing from the sludge during the operation of the coagulation reaction tank and the cavitation air flotation tank is connected to a next treatment system through a pipeline.
The invention also provides a treatment process of the cavitation air flotation equipment for sludge concentration, which comprises the following steps:
A. conveying the residual sludge at the bottom of a secondary sedimentation tank of the sewage treatment system to a coagulation reaction tank, adding a foaming agent into the coagulation reaction tank, and stirring and coagulating the foaming agent and the residual sludge;
B. the coagulated sludge flows to a cavitation air floating tank by virtue of gravity, and bubbles float solid pollutants in the residual sludge to be treated to the liquid level by virtue of a large amount of micro-air generated by cavitation air floating;
C. the reflux device inputs the waste water which is not fully reacted at the bottom of the cavitation air flotation tank into the aeration chamber again;
D. discharging solid pollutants on the liquid surface to a subsequent dehydration system through a slag scraping device;
E. clear water is discharged through the middle adjustable overflow weir plate and flows back to the adjusting tank of the sewage treatment system;
F. the sludge is discharged through a sludge discharge hopper at the bottom of the cavitation air flotation tank.
The foaming agent and the flocculating agent added in the process are screened according to the properties of different types of sludge, the foaming agent acts as bridging and bubbles, the adding amount is 20mg/L, the flocculating agent adopts cationic polyacrylamide, and the adding amount is 8 mg/L. After the treatment by the process, the water content of the excess sludge is reduced to less than 95 percent from the original 99 percent, and the volume is reduced to the original 1/5 percent. The occupation is 1/3 of gravity sludge concentration.
The invention has the advantages of simple process flow, strong process adaptability, high treatment efficiency, small occupied area, stable operation, safety, reliability, low energy consumption, high automation degree, continuous operation, no odor overflow and the like in the sludge concentration process. The cavitation air flotation process is used for effectively removing the interstitial water in the residual sludge, so that the volume of the sludge is reduced, the re-release of phosphorus enriched in the sludge is prevented due to short retention time, the running cost and running risk of a system are reduced, the treatment efficiency is improved, and the deep phosphorus removal process in a wastewater process section is reduced. The method has objective influence on post-stage sludge treatment equipment, type selection of pipelines and reduction of the dosage of medicaments.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
In the figure: 1 feed inlet, 2 foaming agent dosing ports, 3 coagulation reaction tank, 4 flocculating agent dosing ports, 5 cavitation aerator, 6 aeration chamber, 7 sludge discharge hopper, 8 reflux unit, 9 slag scraping unit, 10 spiral slag discharging unit and discharge port, 11 adjustable overflow weir plate, 12 cavitation air flotation tank, 13 water outlet
Detailed Description
Example one
Embodiments of the invention are further described below with reference to the accompanying drawings:
referring to fig. 1, the working principle of the present embodiment is as follows: the sludge-water mixture after adding the drugs enters an aeration zone provided with a cavitation aerator, the cavitation aerator 5 forms a vacuum zone in the water through the rapid rotation of a hollow impeller at the bottom, at the moment, the air at the upper part is pumped into the bottom of the box body through a hollow pipeline, and the air is crushed into micro-bubbles under three shearing forces generated by the rapid rotation of the impeller at the bottom, and the micro-bubbles are organically combined with solid pollutants in the sludge and rise to the liquid level. After reaching the liquid level, the solid pollutants are supported by the micro bubbles and float on the water surface, the sludge after concentration is scraped into the spiral sludge discharge groove through the slag scraping device 9, and the clear liquid after solid-liquid separation is discharged from the water outlet 13 through the adjustable overflow weir plate 11. A small amount of solid pollutants which have larger specific gravity and cannot float upwards are periodically discharged through a mud discharge hopper 7 at the bottom of the cavitation air flotation tank.
The embodiment comprises a coagulation reaction tank 3 and a cavitation air flotation tank 12. The coagulation reaction tank 3 and the cavitation air flotation tank 12 are normal pressure containers, and the coagulation reaction tank 3 and the cavitation air flotation tank 12 are made of carbon steel or stainless steel or concrete and are subjected to anticorrosion treatment. The feed inlet 1 of the coagulation reaction tank 3 is connected with a lift pump, the residual sludge at the bottom of the secondary sedimentation tank of the previous procedure is lifted by the lift pump to enter the feed inlet 1 of the coagulation reaction tank 3, the coagulation reaction tank 3 is provided with a foaming agent feeding port 2, and a stirrer is arranged in the coagulation reaction tank 3. The foaming agent is added through a foaming agent adding port 2. Under the action of a stirrer in the coagulation reaction tank 3, the small-particle sludge in the feeding materials is coagulated to form larger-particle sludge, and the surface tension of the sludge is increased. The outlet of the coagulation reaction tank 3 is connected with the inlet of the cavitation air flotation tank 12 through a pipeline. The front end of the cavitation air flotation tank 12 is provided with an aeration chamber 6, and a pipeline entering the inlet of the aeration chamber 6 is provided with a flocculating agent dosing port 4. A volute aerator 5 is arranged in the aeration chamber 6. The cavitation aerator 5 is vertically arranged in the aeration chamber 6, and the bottom of the cavitation aerator 5 is provided with a hollow impeller. In the operation process, the cavitation aerator 5 forms a vacuum area in water through the rapid rotation of the hollow impeller at the bottom, at the moment, the air above is pumped to the bottom of the aeration chamber 6 through the hollow pipeline, the air is crushed into micro-bubbles under three shearing forces generated by the rapid rotation of the impeller at the bottom of the cavitation aerator 5, and the micro-bubbles are organically combined with solid pollutants in the fed sludge and rise to the liquid level. The bottom of the aeration chamber 6 is provided with a reflux device 8 consisting of a plurality of reflux pipes, in this embodiment three reflux pipes. Because the cavitation aerator 5 rotates at a high speed to form a vacuum area in the aeration chamber 6 to generate micro negative pressure, the water flow at the bottom of the cavitation air floating groove 12 is acted by the negative pressure, and the wastewater which is still not fully reacted is sucked into the aeration chamber 6 from a return pipe at the bottom of the cavitation air floating groove 12, so that the secondary circulation removal of sinking pollutants is realized. The top of the cavitation air flotation tank 12 is provided with a slag scraping device 9 driven by a motor, and the lower part of the slag scraping device 9 is provided with a scum collecting tank, a spiral slag discharging device and a discharging port 10. The slag scraping device 9 is made of stainless steel, rubber, high polymer and other materials. The concentrated sludge entering the spiral slag discharging device is conveyed to a subsequent process by the spiral slag discharging device for dehydration, and a sludge discharge hopper 7 is arranged at the bottom of the vortex concave air floating groove 12 and used for depositing sludge with higher density and discharging the sludge regularly. The rear end of the cavitation air flotation tank 12 is provided with an adjustable overflow weir plate 11 and a water outlet 13, and the adjustable overflow weir plate 11 is adjusted by a hand wheel or automatically adjusted. This embodiment is a hand wheel adjustment. The liquid level height of the overflow weir plate 11 can be adjusted by adjusting the concentration and the amount of the sludge to be treated. Clear liquid separated from solid and liquid moves forwards by gravity and flows to the adjustable overflow weir plate 11 at the rear end from the cavitation air flotation tank 12 to be discharged. The water outlet 13 is connected with an adjusting tank of the sewage treatment system through a pipeline. And waste gas overflowing from the sludge during the operation of the coagulation reaction tank 3 and the cavitation air flotation tank 12 is connected to a next treatment system through a pipeline.
The treatment process of the present embodiment includes the following steps:
A. conveying the residual sludge at the bottom of a secondary sedimentation tank of the sewage treatment system to a coagulation reaction tank 3, adding 20mg/L of foaming agent into the coagulation reaction tank 3, adding 8mg/L of cationic polyacrylamide serving as a flocculating agent, and stirring and coagulating the foaming agent and the residual sludge;
B. the coagulated sludge flows to a cavitation air flotation tank 12 by virtue of gravity, and a large amount of micro air generated by the cavitation air flotation tank 12 floats solid pollutants in the residual sludge to be treated on the liquid level;
C. the reflux device 8 inputs the waste water which is not fully reacted at the bottom of the cavitation air flotation tank 12 into the aeration chamber again;
D. the solid pollutants on the liquid surface are discharged to a subsequent dehydration system through a slag scraping device 9;
E. clear water is discharged through the middle adjustable overflow weir plate 11 and flows back to the adjusting tank of the sewage treatment system;
F. the sludge is discharged outside through a sludge discharge hopper 7 at the bottom of the cavitation air flotation tank 12.
Claims (5)
1. A cavitation air flotation device for sludge concentration comprises: the device is characterized in that the coagulation reaction tank and the cavitation air flotation tank are normal pressure containers, a feed inlet of the coagulation reaction tank is connected with a lift pump, the coagulation reaction tank is provided with a foaming agent feeding port, a stirrer is arranged in the coagulation reaction tank, an outlet of the coagulation reaction tank is connected with an inlet of the cavitation air flotation tank through a pipeline, an aeration chamber is arranged at the front end of the cavitation air flotation tank, a flocculating agent feeding port is arranged on the pipeline entering an inlet of the aeration chamber, a cavitation aerator is arranged in the aeration chamber, a reflux device consisting of a plurality of reflux pipes is arranged at the bottom of the aeration chamber, a slag scraping device driven by a motor is arranged at the top of the cavitation air flotation tank, the lower part of the slag scraping device is provided with a scum collecting tank, a spiral slag discharging device and a discharging port, the bottom of the cavitation air flotation tank is provided with a mud discharging hopper, the rear end of the cavitation air flotation tank is provided with an adjustable overflow weir plate and a water outlet, and the water outlet is connected with an adjusting tank of a sewage treatment system through a pipeline.
2. The cavitation air flotation device for sludge concentration according to claim 1, wherein the cavitation aerator is vertically installed in the aeration chamber, and a hollow impeller is provided at the bottom of the cavitation aerator.
3. The cavitation air flotation device for sludge concentration according to claim 1, characterized in that the adjustable overflow weir plate is hand wheel adjustment or automatic adjustment.
4. The cavitation air flotation device for sludge concentration according to claim 1, wherein the waste gas overflowing from the sludge during the operation of the coagulation reaction tank and the cavitation air flotation tank is connected to a next treatment system through a pipeline.
5. A treatment process of cavitation air flotation equipment for sludge concentration comprises the following steps:
A. conveying the residual sludge at the bottom of a secondary sedimentation tank of the sewage treatment system to a coagulation reaction tank, adding a foaming agent into the coagulation reaction tank, and stirring and coagulating the foaming agent and the residual sludge;
B. the coagulated sludge flows to a cavitation air floating tank by virtue of gravity, and bubbles float solid pollutants in the residual sludge to be treated to the liquid level by virtue of a large amount of micro-air generated by cavitation air floating;
C. the reflux device inputs the waste water which is not fully reacted at the bottom of the cavitation air flotation tank into the aeration chamber again;
D. discharging solid pollutants on the liquid surface to a subsequent dehydration system through a slag scraping device;
E. clear water is discharged through the middle adjustable overflow weir plate and flows back to the adjusting tank of the sewage treatment system;
F. the sludge is discharged through a sludge discharge hopper at the bottom of the cavitation air flotation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256629.5A CN111204953A (en) | 2019-04-01 | 2019-04-01 | Cavitation air flotation equipment for sludge concentration and treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256629.5A CN111204953A (en) | 2019-04-01 | 2019-04-01 | Cavitation air flotation equipment for sludge concentration and treatment process |
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|---|---|
| CN111204953A true CN111204953A (en) | 2020-05-29 |
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| CN201910256629.5A Pending CN111204953A (en) | 2019-04-01 | 2019-04-01 | Cavitation air flotation equipment for sludge concentration and treatment process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2677364Y (en) * | 2003-12-16 | 2005-02-09 | 石洪军 | Cavitation air floating continuous sewage discharge precipitation machine |
| WO2013048010A1 (en) * | 2011-09-28 | 2013-04-04 | Kim Seong Jong | Advanced water treatment system for membrane separation using removal of phosphors and membrane fouling materials of sidestream |
| CN203048629U (en) * | 2012-10-15 | 2013-07-10 | 杨志江 | Cavitation air floatation device |
| CN104341068A (en) * | 2013-07-30 | 2015-02-11 | 麦王环境技术股份有限公司 | Combined cavitation air flotation apparatus and technology thereof |
| CN108178492A (en) * | 2018-01-15 | 2018-06-19 | 煤科集团杭州环保研究院有限公司 | A kind of municipal administration domestic sludge floatation thickening processing equipment and method |
| CN209974593U (en) * | 2019-04-01 | 2020-01-21 | 麦王环境技术股份有限公司 | Cavitation air flotation equipment for sludge concentration |
-
2019
- 2019-04-01 CN CN201910256629.5A patent/CN111204953A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2677364Y (en) * | 2003-12-16 | 2005-02-09 | 石洪军 | Cavitation air floating continuous sewage discharge precipitation machine |
| WO2013048010A1 (en) * | 2011-09-28 | 2013-04-04 | Kim Seong Jong | Advanced water treatment system for membrane separation using removal of phosphors and membrane fouling materials of sidestream |
| CN203048629U (en) * | 2012-10-15 | 2013-07-10 | 杨志江 | Cavitation air floatation device |
| CN104341068A (en) * | 2013-07-30 | 2015-02-11 | 麦王环境技术股份有限公司 | Combined cavitation air flotation apparatus and technology thereof |
| CN108178492A (en) * | 2018-01-15 | 2018-06-19 | 煤科集团杭州环保研究院有限公司 | A kind of municipal administration domestic sludge floatation thickening processing equipment and method |
| CN209974593U (en) * | 2019-04-01 | 2020-01-21 | 麦王环境技术股份有限公司 | Cavitation air flotation equipment for sludge concentration |
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Application publication date: 20200529 |
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