CN109231589B - Self-circulation negative pressure flotation sewage treatment system - Google Patents
Self-circulation negative pressure flotation sewage treatment system Download PDFInfo
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- CN109231589B CN109231589B CN201811395834.1A CN201811395834A CN109231589B CN 109231589 B CN109231589 B CN 109231589B CN 201811395834 A CN201811395834 A CN 201811395834A CN 109231589 B CN109231589 B CN 109231589B
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- sewage
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- tank
- pipe
- water
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- 239000010865 sewage Substances 0.000 title claims abstract description 80
- 238000005188 flotation Methods 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims description 18
- 238000007790 scraping Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 239000008213 purified water Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000013043 chemical agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 2
- 238000009300 dissolved air flotation Methods 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a self-circulation negative pressure flotation sewage treatment system, which comprises a sewage pretreatment component, a flotation tank, a water injector and a backflow water feed pump, wherein the flotation tank is arranged in the sewage pretreatment component; the sewage pretreatment component mixes sewage with chemical reagent and conveys the mixed sewage to a flotation tank, a sewage inlet pipe, a return dissolved air water inlet pipe and an air suction inlet are arranged on the flotation tank, and the water injector is provided with a jet inlet, a jet outlet, a negative pressure suction inlet and a supplementary air inlet; the outlet of the pretreatment component is connected with a sewage inlet pipe, the return pipe is connected with the inlet of a return water feed pump, the outlet of the return water feed pump is connected with an injection inlet, the injection outlet is connected with a return dissolved air water inlet pipe, and the air suction inlet is connected with a negative pressure suction inlet. The invention has simple structure and low energy consumption, and is beneficial to energy conservation and environmental protection.
Description
Technical Field
The invention relates to the field of industrial sewage treatment, in particular to a self-circulation negative pressure flotation sewage treatment system.
Background
The dissolved air flotation technology is to inject or produce tiny bubbles into the wastewater, then make the tiny bubbles collide with the flocs in the water and adhere to the flocs, so that the whole density is smaller than that of the water and floats upwards, and finally floats on the surface of the liquid and is discharged out of the system by the slag scraping device. Dissolved air flotation is classified into a pressurized dissolved air method and a vacuum dissolved air method according to the principle of generating bubbles. The pressurized dissolved air is dissolved into a large amount of air under the high pressure condition, and is released in the form of micro bubbles when the pressure suddenly drops to low pressure or normal pressure, so that the air floatation treatment of the wastewater is performed.
The air dissolving process of the pressurized air dissolving method in the prior art needs to be carried out under the condition of high pressure, has large energy consumption, and is not beneficial to energy conservation and environmental protection.
The vacuum gas dissolving process is carried out under normal pressure or low pressure, and the gas releasing process is carried out under negative pressure. Compared with the pressurized air dissolving method, the vacuum air dissolving method does not need strong pressurization, and the energy consumption is lower than that of pressurized air dissolving air floatation.
Disclosure of Invention
The invention aims to: the invention aims to overcome the defects of the prior art and provide a self-circulation negative pressure flotation sewage treatment system, which adopts a vacuum air dissolving method to dissolve air, wherein the air dissolving process can be carried out under normal pressure or low pressure, and the air release is carried out under micro negative pressure, so that the self-circulation negative pressure flotation sewage treatment system has low energy consumption and simple structure, and is beneficial to energy conservation and environmental protection.
The technical scheme is as follows: the invention relates to a self-circulation negative pressure flotation sewage treatment system, which comprises a sewage pretreatment component, a flotation tank, a water injector and a backflow water feed pump, wherein the flotation tank is arranged in the sewage pretreatment component; the sewage pretreatment component mixes sewage with chemical reagent and conveys the mixed sewage to a flotation tank, a sewage inlet pipe, a return dissolved air water inlet pipe and an air suction inlet are arranged on the flotation tank, and the water injector is provided with a jet inlet, a jet outlet, a negative pressure suction inlet and a supplementary air inlet; the outlet of the pretreatment component is connected with a sewage inlet pipe, the return pipe is connected with the inlet of a return water feed pump, the outlet of the return water feed pump is connected with an injection inlet, the injection outlet is connected with a return dissolved air water inlet pipe, and the air suction inlet is connected with a negative pressure suction inlet.
The invention further preferably adopts the technical scheme that the flotation tank comprises an overflow clean water tank arranged at the upper part of the tank body and a scum collecting box for collecting scum; the overflow clean water tank is a tank body with a circle of arranged along the outer circumference of the tank body, the overflow clean water tank is provided with a purified water outlet pipe and a return pipe, the overflow clean water tank is adjacent to and is also provided with an overflow baffle along the inner circle of the tank body, the scum collecting box is arranged in the tank body, and the scum collecting box is provided with a scum outlet pipe for discharging scum.
Preferably, a stirring device is arranged at the center of the tank body of the flotation tank; the upper end of the stirring device is connected with a stirring motor, a slag scraping machine is arranged on the upper portion of the stirring device, the slag scraping machine is positioned at an upper port of the scum collecting box, a mud scraping rake is arranged on the lower portion of the stirring device, and the mud scraping rake is positioned at the bottom of the tank body of the flotation tank.
Preferably, a central feeding cylinder is arranged in the center of the tank body of the flotation tank, and the central feeding cylinder is connected with a collecting pipe; the inner end of the collecting pipe is connected with a central feeding cylinder, and the outer end of the collecting pipe extends out of the flotation tank body; the outer end of the collecting pipe is connected with a sewage inlet pipe and a backflow dissolved air water inlet pipe; the sewage inlet pipe is connected with the sewage feed pump outlet.
Preferably, the top of the tank body of the flotation tank is respectively provided with a pressure meter, a blow-down pipe and an air suction inlet; the air suction inlet is connected with the negative pressure suction inlet of the water ejector, and a drain pipe for draining sewage is arranged at the bottom of the tank body of the flotation tank.
Preferably, the pretreatment assembly comprises a mixer, a dosing adjustment tank and a sewage feed pump; adding sewage and chemical reagent into a mixer for mixing, wherein the outlet of the mixer is connected with the inlet of a dosing adjusting tank, the outlet of the dosing adjusting tank is connected with the inlet of a sewage feed pump, and the outlet of the sewage feed pump is connected with a sewage inlet pipe of a flotation tank.
The working principle of the invention is as follows:
Adding chemical agents and sewage to be treated into a mixer through a chemical dosing system, wherein the chemical agents are preferably ferric trichloride, coagulant aids, magnesium sulfate and sodium hydroxide, so that the chemical agents and the sewage to be treated are mixed in the mixer, and after the mixed sewage is treated through a dosing adjusting tank, the sewage is conveyed to a flotation tank through a sewage inlet pipe by a sewage feeding pump; part of the reflux purified water in the flotation tank flows back to a reflux water feeding pump through a reflux pipe, and the reflux water feeding pump sprays the reflux purified water into a water sprayer through a spray inlet; the water ejector generates air and external air sucked into the flotation tank in a micro vacuum area due to the jet effect of water, the flotation tank generates micro negative pressure due to the suction effect of the water ejector, the air sucked by the water ejector is dissolved in the reflux purified water to be mixed with sewage to be treated and then reentered into the flotation tank, under the negative pressure condition of the flotation tank, the dissolved air releases air to generate micro bubbles, and the micro bubbles collide with the floccules and the floating oil in the water to be adhered and float upwards, finally float on the surface of the sewage, are cleaned by the slag scraper to enter a scum collecting box, and are discharged out of the system through a scum outlet pipe.
The beneficial effects are that: (1) According to the invention, the water ejector is arranged to spray and disperse the reflux purified water, negative pressure is formed in the ejector due to the spraying action of the water ejector, the air in the flotation tank and part of external air are sucked, and the sucked air can be efficiently dissolved in the reflux purified water and mixed with sewage to be treated to enter the flotation tank for re-flotation separation; meanwhile, the suction effect of the water ejector enables the flotation tank to form micro negative pressure; the reflux dissolved air water entering the flotation tank and the sewage to be treated release air under the negative pressure condition to generate micro bubbles, collide with flocs and floating oil in the water to adhere and float, finally float on the surface of the sewage, are cleaned by a slag scraper into a scum collecting box, and finally are discharged out of the system through a scum outlet pipe. The whole system of the invention has simple structure and low energy consumption, effectively reduces the sewage treatment cost and realizes the rapid separation of oil residues.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
figure 2 is a top view of a flotation tank according to the invention.
Wherein, 1, flotation tank, 101, back flow, 102, central feed cylinder, 103, mud scraping rake, 104, overflow clean water tank, 105, slag scraping machine, 106, purified water outlet pipe, 107, blow off pipe, 108, blow-down pipe, 109, agitating unit, 110, manometer, 111, scum collecting box, 112, overflow baffle, 113, oil residue outlet pipe, 114, sewage inlet pipe, 115, reflux dissolved air water inlet pipe, 116, agitator motor, 117, collecting pipe, 118, air suction inlet, 2, mixer, 3, dosing adjusting tank, 4, sewage feed pump, 5, reflux water feed pump, 6, water injector, 601, injection inlet, 602, injection outlet, 603, negative pressure suction inlet, 604, air inlet.
Detailed Description
The technical scheme of the invention is described in detail below through the drawings, but the protection scope of the invention is not limited to the embodiments.
Examples: a self-circulation negative pressure flotation sewage treatment system comprises a sewage pretreatment component, a flotation tank 1, a water injector 6 and a backflow water feed pump 5; the pretreatment component comprises a mixer 2, a dosing adjusting tank 3 and a sewage feeding pump 4, wherein a sewage inlet pipe 114, a return pipe 101, a return dissolved air water inlet pipe 115 and an air suction inlet 118 are arranged on the flotation tank 1, and a water injector 6 is provided with an injection inlet 601, an injection outlet 602, a negative pressure suction inlet 603 and a supplementary air inlet 604; adding sewage and chemical reagent into a mixer 2 for mixing, wherein the outlet of the mixer 2 is connected with the inlet of a dosing adjusting tank 3, the outlet of the dosing adjusting tank 3 is connected with the inlet of a sewage feeding pump 4, and the outlet of the sewage feeding pump 4 is connected with a sewage inlet pipe 114 of a flotation tank 1; the return pipe 101 is connected to an inlet of the return water feed pump 5, an outlet of the return water feed pump 5 is connected to the injection inlet 601, the injection outlet 602 is connected to the return dissolved air inlet pipe 115, and the air suction port 118 is connected to the negative pressure suction port 603.
The invention further preferably adopts the technical scheme that the flotation tank 1 comprises an overflow clean water tank 104 arranged at the upper part of the tank body and a scum collecting box 111 for collecting scum; the overflow clean water tank 104 is a tank body which is arranged along the outer circumference of the tank body, the overflow clean water tank 104 is provided with a purified water outlet pipe 106 and a return pipe 101, the overflow clean water tank 104 is also arranged adjacent to the inner circumference of the tank body and is provided with an overflow baffle 112, the scum collecting box 111 is arranged in the tank body, and the scum collecting box 111 is provided with a scum outlet pipe 113 for discharging scum;
The center of the tank body of the flotation tank 1 is provided with a center feeding cylinder 102, and the center feeding cylinder 102 is connected with a collecting pipe 117; the inner end of the collecting pipe 117 is connected with the central feeding cylinder 102, and the outer end extends out of the flotation tank 1; the outer end of the collecting pipe 117 is connected with a sewage inlet pipe 114 and a reflux dissolved air water inlet pipe 115; the sewage inlet pipe 114 is connected with the outlet of the sewage feed pump 4; the top of the flotation tank 1 is respectively provided with a pressure gauge 110, a blow-down pipe 108 and an air suction inlet 118; the air suction port 118 is connected to the negative pressure suction port 603 of the hydro jet 6;
a stirring device 109 is arranged at the center of the tank body of the flotation tank 1; the upper end of the stirring device 109 is connected with a stirring motor 116, the upper part of the stirring device is provided with a slag scraping machine 105, the slag scraping machine 105 is positioned at the upper port of the slag collecting box 111, floating slag is scraped into the slag collecting box 111, and the slag is discharged out of the tank body through a slag outlet pipe 113; the stirring device 109 is provided with a mud scraping rake 103 at the lower part, is positioned at the bottom of the tank body of the flotation tank 1, is provided with a drain pipe 107 for draining sewage at the bottom of the tank body of the flotation tank 1, and the mud scraping rake 103 discharges mud which is sunk into the bottom of the flotation tank 1 out of the tank body through the drain pipe 107.
The working principle of the invention is as follows:
adding chemical agent and sewage to be treated into the mixer 2 through a chemical dosing system, wherein the chemical agent is preferably ferric trichloride, coagulant aid, magnesium sulfate and sodium hydroxide, so that the chemical agent and the sewage to be treated are mixed in the mixer 2, and the mixed sewage is treated by a dosing adjusting tank 3 and then is conveyed to a flotation tank 1 through a sewage inlet pipe 114 by a sewage feeding pump 4; part of the reflux purified water in the flotation tank 1 is refluxed to the reflux water feeding pump 5 through the reflux pipe 101, and the reflux water feeding pump 5 sprays the reflux purified water into the water injector 6 through the injection inlet 601; the water ejector 6 generates air sucked into the flotation tank 1 and external air by a micro vacuum area due to the jet effect of water, the flotation tank 1 generates micro negative pressure due to the suction effect of the water ejector 6, the air sucked by the water ejector 6 is dissolved in the reflux purified water and mixed with sewage to be treated to enter the flotation tank 1 again, under the negative pressure condition of the flotation tank 1, the dissolved air releases air to generate micro bubbles, collides with water flocs and floating oil to adhere and float upwards, finally floats on the surface of the sewage, is cleaned by the slag scraper 105 and enters the slag collecting box 111, and is discharged out of the system through the slag outlet pipe 113.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A self-circulation negative pressure flotation sewage treatment system is characterized in that: comprises a sewage pretreatment component, a flotation tank, a water injector and a backflow water feed pump; the sewage pretreatment component mixes sewage with chemical reagent and conveys the mixed sewage to a flotation tank, a sewage inlet pipe, a return dissolved air water inlet pipe and an air suction inlet are arranged on the flotation tank, and the water injector is provided with an injection inlet, an injection outlet, a negative pressure suction inlet and a supplementary air inlet; the outlet of the pretreatment component is connected with a sewage inlet pipe, the return pipe is connected with the inlet of a return water feed pump, the outlet of the return water feed pump is connected with an injection inlet, the injection outlet is connected with a return dissolved air water inlet pipe, and the air suction inlet is connected with a negative pressure suction inlet;
A central feeding cylinder is arranged in the center of the tank body of the flotation tank, and is connected with a collecting pipe; the inner end of the collecting pipe is connected with a central feeding cylinder, and the outer end of the collecting pipe extends out of the flotation tank body; the outer end of the collecting pipe is connected with a sewage inlet pipe and a backflow dissolved air water inlet pipe; the sewage inlet pipe is connected with the sewage feed pump outlet;
The top of the tank body of the flotation tank is respectively provided with a pressure meter, a blow-down pipe and an air suction inlet; the air suction inlet is connected with the negative pressure suction inlet of the water ejector, and a drain pipe for draining sewage is arranged at the bottom of the tank body of the flotation tank.
2. A self-circulating negative pressure flotation wastewater treatment system according to claim 1, wherein: the flotation tank comprises an overflow clean water tank arranged at the upper part of the tank body and a scum collecting box for collecting scum; the overflow clean water tank is a tank body with a circle of arranged along the outer circumference of the tank body, the overflow clean water tank is provided with a purified water outlet pipe and a return pipe, the overflow clean water tank is adjacent to and is also provided with an overflow baffle along the inner circle of the tank body, the scum collecting box is arranged in the tank body, and the scum collecting box is provided with a scum outlet pipe for discharging scum.
3. A self-circulating negative pressure flotation wastewater treatment system according to claim 2, wherein: a stirring device is arranged at the center of the tank body of the flotation tank; the upper end of the stirring device is connected with a stirring motor, a slag scraping machine is arranged on the upper portion of the stirring device, the slag scraping machine is positioned at an upper port of the scum collecting box, a mud scraping rake is arranged on the lower portion of the stirring device, and the mud scraping rake is positioned at the bottom of the tank body of the flotation tank.
4. A self-circulating negative pressure flotation wastewater treatment system according to claim 1, wherein: the pretreatment component comprises a mixer, a dosing adjusting tank and a sewage feeding pump; adding sewage and chemical reagent into a mixer for mixing, wherein the outlet of the mixer is connected with the inlet of a dosing adjusting tank, the outlet of the dosing adjusting tank is connected with the inlet of a sewage feed pump, and the outlet of the sewage feed pump is connected with a sewage inlet pipe of a flotation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811395834.1A CN109231589B (en) | 2018-11-22 | 2018-11-22 | Self-circulation negative pressure flotation sewage treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811395834.1A CN109231589B (en) | 2018-11-22 | 2018-11-22 | Self-circulation negative pressure flotation sewage treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109231589A CN109231589A (en) | 2019-01-18 |
| CN109231589B true CN109231589B (en) | 2024-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811395834.1A Active CN109231589B (en) | 2018-11-22 | 2018-11-22 | Self-circulation negative pressure flotation sewage treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111498936B (en) * | 2020-05-29 | 2022-05-17 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Flotation cabinet device with multi-stage flow guide and overflow structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202152290U (en) * | 2011-07-08 | 2012-02-29 | 蓝星环境工程有限公司 | Pressurized dissolved-air floating system |
| CN102951714A (en) * | 2012-12-03 | 2013-03-06 | 杭州太一化工科技有限公司 | Gas dissolving floatation machine |
| CN209383545U (en) * | 2018-11-22 | 2019-09-13 | 中建安装集团有限公司 | A kind of self-loopa negative pressure flotation sewage disposal system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210092A (en) * | 1998-09-21 | 1999-03-10 | 孙光跃 | Water treatment process by jet gas soluted floatation |
| CN105855067B (en) * | 2016-05-30 | 2018-08-21 | 广东上典环境保护工程有限公司 | A kind of unpowered flotation device |
-
2018
- 2018-11-22 CN CN201811395834.1A patent/CN109231589B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202152290U (en) * | 2011-07-08 | 2012-02-29 | 蓝星环境工程有限公司 | Pressurized dissolved-air floating system |
| CN102951714A (en) * | 2012-12-03 | 2013-03-06 | 杭州太一化工科技有限公司 | Gas dissolving floatation machine |
| CN209383545U (en) * | 2018-11-22 | 2019-09-13 | 中建安装集团有限公司 | A kind of self-loopa negative pressure flotation sewage disposal system |
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| CN109231589A (en) | 2019-01-18 |
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Country or region after: China Address after: 210023 No. 6 Wenlan Road, Xianlin University City, Qixia District, Nanjing City, Jiangsu Province Applicant after: CHINA CONSTRUCTION INDUSTRIAL & ENERGY ENGINEERING GROUP Co.,Ltd. Address before: 210023 No. 6 Wenlan Road, Xianlin University City, Qixia District, Nanjing City, Jiangsu Province Applicant before: China Construction Installation Engineering Co.,Ltd. Country or region before: China |
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