CN203079767U - Oil-water separator with strong effect - Google Patents
Oil-water separator with strong effect Download PDFInfo
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- CN203079767U CN203079767U CN 201320102840 CN201320102840U CN203079767U CN 203079767 U CN203079767 U CN 203079767U CN 201320102840 CN201320102840 CN 201320102840 CN 201320102840 U CN201320102840 U CN 201320102840U CN 203079767 U CN203079767 U CN 203079767U
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- phase separation
- oil
- storehouse
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- bin
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Abstract
The utility model discloses an oil-water separator with a strong effect. The oil-water separator comprises a solid phase separation bin (1), a liquid phase separation bin (2) and a settling bin (3), wherein the liquid phase separation bin (2) is internally provided with a liquid phase separation device; the liquid phase separation device comprises corrugated plates (4) which are placed horizontally and arranged at intervals; the cross section of the liquid phase separation bin (2) is completely covered by the corrugated plates (4); the cross section of each corrugated plate (4) is in the shape of a sine curve; and a through hole is formed in each corrugated plate (4). The oil-water separator has the following beneficial effects that the flat and straight sine corrugated plates are adopted for liquid phase separation, so that the oil-water separation speed is accelerated and the separation effect is good; the solid phase separation bin, the liquid phase separation bin and the settling bin are communicated, and a liquid circulates through pressure without other power, so that the cost is lowered greatly; and a sterilizing-deodorizing bin is added in the oil-water separator, so that waste water can be sterilized and deodorized firstly before being discharged reasonably and therefore, the pollution to environment is reduced.
Description
Technical field
The utility model relates to a kind of water-and-oil separator, particularly relates to a kind of potent water-and-oil separator.
Background technology
Along with development of times; environmental protection consciousness strengthens gradually; country forbids that clearly oily(waste)water directly enters river course and urban pipe network, and oily(waste)water is meant the waste water that contains fat (lipid acid, soap excrement, fat, wax etc.) and various oils (mineral oil, vegetable and animals oils).The existence form of oil in water: suspension oil, dispersed oil, oil in water emulsion.The characteristics of oily(waste)water are COD, BOD height, and certain smell and colourity, inflammable, easy oxygenolysis are arranged, and are generally light than water, be insoluble in water.Oily(waste)water is large in number and widely distributed and harm is serious; in processes such as oil production, refining of petroleum, petrochemical complex, storage and shipping of oil products, oil tanker accident, steamer shipping, vehicle cleaning, machinofacture, food-processing, all can produce oily(waste)water, very harmful to HUMAN HEALTH, environment protection and the eubiosis.The pollution of oily(waste)water shows that mainly the following aspects (1) worsens water quality, harm aquatic resources; (2) be detrimental to health; (3) atmosphere pollution (4) influences farm crop production; (5) influence natural landscape: the clean natural water source of (6) influence.
Water-and-oil separator is exactly the equipment that oily and water sepn are come, and principle mainly is the density difference according to water and oil, utilizes sedimentation theory to remove the separator of impurity and moisture content, and the shortcoming of existing water-and-oil separator has: (1) oily water separation speed is slow; (2) oil-water separation is poor, and oleaginousness is also too high in the last discharge water.
The utility model content
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, and a kind of potent water-and-oil separator is provided, and velocity of separation is slow at work to overcome existing water-and-oil separator, and the oil-water separation defect of bad.
The purpose of this utility model is achieved through the following technical solutions: potent water-and-oil separator, comprise solid phase separation bin, liquid phase separation storehouse and settling banker, described liquid phase separation is provided with the liquid phase separation device in the storehouse, described liquid phase separation device comprises horizontal positioned and the equidistant at interval waved plate of arranging, the be separated cross section in storehouse of the complete covering liquid of described waved plate, the cross section of waved plate is sinusoidal shape, all is provided with through hole on each waved plate.Oily(waste)water carries out earlier solid phase in the solid phase separation bin separates, promptly remove the solid particulate in the oily(waste)water, enter the liquid phase separation storehouse then and carry out liquid phase separation, oil droplet and water are separated as far as possible, in the liquid phase separation storehouse, the liquid phase separation device is spaced straight sinusoid waved plate, according to shallow pond precipitation law, stokes lentor (Stocks) law, and the variation of current streamline water-carrying section is diffusion, contraction schedule alternately flows, produced the movement locus of sinuous pulsation current, ripple is made sinusoidal wave form, the collision probability is increased greatly, impel tiny oil droplets to aggregate into larger oil droplet mutually, vertically float by the through hole on the waved plate, realize oily water separation, this separation method is compared with existing separation method fast, the effective advantage that has speed.And the oleophilic hydrophil balance value on waved plate surface (BHL) if big or especially little especially, i.e. oleophyllie hydrophobic or hydrophilic and oleophobic, the polymerization that all helps fine droplet becomes big, realizes the profit high efficiency separation.Last oily(waste)water enters settling banker, carries out further oily water separation, then can sucking-off waste oil, discharge waste water again.
Further, described solid phase separation bin, liquid phase separation storehouse and settling banker are positioned at same housing, the three separates by dividing plate, be communicated with by the filter opening of arranging on the dividing plate between solid phase separation bin and the liquid phase separation storehouse, the runner of offering by the dividing plate bottom between settling banker and the liquid phase separation storehouse is communicated with, and three storehouses directly are communicated with, and liquid circulates voluntarily by pressure, saved a large amount of manually, the overall operation of device is also very smooth.When level exceeded the liquid phase separation storehouse in the solid phase separation bin, liquid flowed to the liquid phase separation storehouse from the solid phase separation bin automatically, flow into settling banker then, and liquid had promptly carried out oily water separation when flowing through waved plate.Be communicated with by the filter opening on the dividing plate between solid phase separation bin and the liquid phase separation storehouse, liquid promptly further filters out solid particulate on filter opening when circulation.
Further, above-mentioned liquid phase separation storehouse sidewall upper is provided with oil outlet, the settling banker sidewall upper is provided with water port and oil discharge outlet, described water port is communicated to the bottom of settling banker by pipeline, oil discharge outlet exceeds oil discharge outlet and oil outlet by the position of water port, and oil discharge outlet and oil outlet place all are provided with valve, when the liquid level in the settling banker exceeds water port, water port is automatic draining, can be communicated to outside wastewater disposal basin by pipeline; When the level attitude of oil reservoir in the settling banker was lower than oil discharge outlet, the staff can open valve and carry out oil extraction; When the level attitude of oil reservoir in the liquid phase separation storehouse was higher than oil outlet, the staff can open valve and carry out oil extraction.Above-mentioned oil discharge outlet is than the low 3～10CM of water port, and oil outlet also than the low 3～10CM of water port, so that realize that the collection of oil reservoir is thick, reaches high-level efficiency oily water separation.
Further, the valve at above-mentioned oil discharge outlet and oil outlet place is a magnetic valve, the inherent position near oil discharge outlet of settling banker is provided with the oil reservoir sensors A, inherent position near oil outlet, liquid phase separation storehouse is provided with oil reservoir transmitter B, the signal output of described oil reservoir sensors A is connected on the oil discharge outlet place valve control end, the signal output of oil reservoir transmitter B is connected on the oil outlet place valve control end, when the level attitude of oil reservoir is low to moderate oil reservoir sensors A or oil reservoir transmitter B, after oil reservoir sensors A or oil reservoir transmitter B sense oil reservoir, promptly can transmit a signal to corresponding magnetic valve, magnetic valve is opened automatically, carry out oil extraction, realize automatic oil draining like this, saved the labour.
Further, the utility model also comprises a deodorization and sterilization storehouse, this deodorization and sterilization storehouse is used for oily(waste)water is carried out germicidal treatment, the external ozone generating apparatus in deodorization and sterilization storehouse, this device is specifically to use ozone to carry out sterilization, ozone is a kind of high-effective broad-spectrum fungicide, to bacterium, virus, mould, gemma, fungi and microorganism etc. all have extremely strong killing power, the sterilizing ability of ozone is higher by 20% than ultraviolet ray, and diffusion voluntarily in water in air, sterilization does not have the dead angle, fast 600 times than chlorine of the sterilization speeds in water, and because ozone finally is reduced to oxygen, so it to human body and environment without any side effect.
Further, be provided with the solid phase tripping device in the above-mentioned solid phase separation bin, described solid phase tripping device comprises filter screen, this device carries out solid phase by filter screen to be separated, described filter screen is divided into feed liquor storehouse and fluid storehouse with the solid phase separation bin, and described feed liquor storehouse is communicated with fluid inlet, and the fluid storehouse is communicated to the liquid phase separation storehouse, practical filter screen carries out solid phase to be separated, and makes that the working process of this device is more smooth and easy.
Further, the bottom of above-mentioned solid phase separation bin, deodorization and sterilization storehouse, liquid phase separation storehouse and settling banker all is provided with exhaust-valve, is used for that emptying is carried out in three storehouses and handles, and needs emptying during as cleaning.
The beneficial effects of the utility model are:
(1) this device adopts straight sinusoidal wave card to carry out liquid phase separation, and oily(waste)water is when mobile, and the collision probability increases greatly between the oil droplet, make oily water separation speed up, and separating effect is better;
(2) be communicated with between solid phase separation bin, liquid phase separation storehouse and the settling banker three in this device, liquid circulates by pressure, need not other power, greatly reduces cost;
(3) added a deodorization and sterilization storehouse in this device, can be earlier to rationally discharging after the waste water germicidal treatment, and can reduce the emission of bad smell of oily(waste)water, reduced pollution to environment.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of waved plate;
Fig. 3 is the structural representation of embodiment 2;
Fig. 4 is the structural representation of the dividing plate between solid phase separation bin and the liquid phase separation storehouse
Fig. 5 is the structural representation of embodiment 3;
Fig. 6 is the structural representation of embodiment 4;
Fig. 7 be among Fig. 6 A to sectional view;
Fig. 8 is the structural representation of embodiment 5;
Fig. 9 be among Fig. 8 A to sectional view;
Figure 10 is the structural representation of embodiment 6;
Figure 11 is the structural representation of embodiment 7;
Figure 12 is the structural representation of embodiment 8;
Among the figure, 1-solid phase separation bin, 2-liquid phase separation storehouse, 3-settling banker, the 4-waved plate, 5-through hole, 6-filter screen, the 7-water port, 8-oil discharge outlet, 9-oil outlet, 10-oil reservoir sensors A, 11-deodorization and sterilization storehouse, 12-ozone generating-device, 13-feed liquor storehouse, 14-fluid storehouse, 15-fluid inlet, the 16-housing, 17-oil reservoir transmitter B, 18-filter opening.
Embodiment
The utility model is described in further detail below in conjunction with embodiment, but structure of the present utility model is not limited only to following examples:
[embodiment 1]
As shown in Figure 1 and Figure 2, potent water-and-oil separator, comprise solid phase separation bin 1, liquid phase separation storehouse 2 and settling banker 3, be provided with the liquid phase separation device in the described liquid phase separation storehouse 2, described liquid phase separation device comprises horizontal positioned and spaced waved plate 4, the be separated cross section in storehouse 2 of described waved plate 4 complete covering liquid, the cross section of waved plate 4 is sinusoidal shape, all is provided with through hole 5 on each waved plate 4.As for the running between above-mentioned three storehouses, in the present embodiment, liquid after handling in the solid phase separation bin 1 can be by in the pump suction liquid phase separation storehouse 2, liquid after handling in the liquid phase separation storehouse 2 also can be by in the pump suction settling banker 3, oil reservoir in the settling banker 3 and water layer also can be extracted out by pump, can extract out earlier in the settling banker 3 and swim in the upper end oil reservoir, then can relieved extraction water layer.As long as above-mentioned operation can realize three liquid communication between the warehouse by any method.
[embodiment 2]
As Fig. 3, Fig. 4, the structure basically identical of the structure of present embodiment and embodiment 1, difference is that described solid phase separation bin 1, liquid phase separation storehouse 2 and settling banker 3 are positioned at same housing 16, the three separates by dividing plate, be communicated with by the filter opening of arranging on the dividing plate 18 between solid phase separation bin 1 and the liquid phase separation storehouse 2, the runner of offering by the dividing plate bottom between settling banker 3 and the liquid phase separation storehouse 2 is communicated with.Liquid between solid phase separation bin 1, liquid phase separation storehouse 2 and the settling banker 3 is by the pressure automatic circulation, solid phase separation bin 1, liquid phase separation storehouse 2, settling banker 3 threes pump each other among the embodiment 1 have been saved, provide cost savings, and the running between three warehouses also becomes very convenient.
[embodiment 3]
As Fig. 5, the structure of present embodiment 1 and embodiment 1 basically identical, difference is, also be provided with a deodorization and sterilization storehouse 11 in the present embodiment, described deodorization and sterilization storehouse 11 is externally connected to an ozone generating-device 12, in operation, before any one link, can carry out sterilization, as long as guarantee before waste discharge, to have the deodorization and sterilization of carrying out to handle.
[embodiment 4]
As Fig. 6, Fig. 7, the structure basically identical of present embodiment and embodiment 2, difference is that liquid phase separation storehouse 2 sidewall upper are provided with oil outlet 9, settling banker 3 sidewall upper are provided with water port 7 and oil discharge outlet 8, described water port 7 is communicated to the bottom of settling banker 3 by pipeline, oil discharge outlet 8 exceeds oil discharge outlet 8 and oil outlet 9 by the position of water port 7, oil discharge outlet 8 and oil outlet 9 places all are provided with valve, when liquid level exceeds water port 7 in the settling banker 3, waste water is promptly discharged from water port 7 automatically, the staff opens the valve at oil discharge outlet 8 and oil outlet 9 places by observing oil level, thereby oil extraction, present embodiment comparative example 1 is different promptly is waste oil in the liquid phase separation storehouse, and the discharging of settling banker 3 interior liquid, saved the pump that is used to extract out liquid in the settling banker 3 among the embodiment 1, provide cost savings, and the running of present embodiment is convenient.Above-mentioned oil discharge outlet 8 is than water port 7 low 3～10CM, and oil outlet 9 also than water port 7 low 3～10CM, so that realize that the collection of oil reservoir is thick, reaches high-level efficiency oily water separation.
[embodiment 5]
As Fig. 8, Fig. 9, the structure basically identical of present embodiment 1 and embodiment 4, difference is that the valve at described oil discharge outlet 8 and oil outlet 9 places is a magnetic valve, settling banker 3 inherent positions near oil discharge outlet 8 are provided with oil reservoir sensors A 10,2 inherent positions near oil outlet 9, liquid phase separation storehouse are provided with oil reservoir transmitter B17, the signal output of described oil reservoir sensors A 10 is connected on oil discharge outlet 8 place's valve control ends, the signal output of oil reservoir transmitter B17 is connected on oil outlet 9 place's valve control ends, saved the step that the staff removes to check oil level like this, can automatic oil draining, saved manpower.
[embodiment 6]
As Figure 10, the structure of present embodiment is basic consistent with embodiment 2, be provided with the solid phase tripping device in the present embodiment in the solid phase separation bin 1, described solid phase tripping device comprises filter screen 6, described filter screen 6 is divided into feed liquor storehouse 13 and fluid storehouse 14 with solid phase separation bin 1, described feed liquor storehouse 13 is communicated with fluid inlet 15, fluid storehouse 14 is communicated to liquid phase separation storehouse 2, present embodiment has determined that use filter screen 6 carries out solid phase and separates, liquid flow filtering net 6 has promptly been realized the solid phase separation, makes among the embodiment 2 that running is more smooth and easy between three storehouses.
[embodiment 7]
As Figure 11, the structure of present embodiment and embodiment 1 basically identical, the bottom of difference solid phase separation bin 1, liquid phase separation storehouse 2 and settling banker 3 all is provided with exhaust-valve, has made things convenient for the cleaning in three storehouses.
[embodiment 8]
As Figure 12, present embodiment is a most preferred embodiment, potent water-and-oil separator, comprise solid phase separation bin 1, liquid phase separation storehouse 2 and settling banker 3, be provided with the liquid phase separation device in the described liquid phase separation storehouse 2, described liquid phase separation device comprises horizontal positioned and spaced waved plate 4, the be separated cross section in storehouse 2 of described waved plate 4 complete covering liquid, the cross section of waved plate 4 is sinusoidal shape, all is provided with through hole 5 on each waved plate 4.
Also be provided with a deodorization and sterilization storehouse 11 in the present embodiment, described deodorization and sterilization storehouse 11 is externally connected to an ozone generating-device 12, solid phase separation bin 1, deodorization and sterilization storehouse 11, liquid phase separation storehouse 2 and settling banker 3 are positioned at same housing 16, four separate by dividing plate, solid phase separation bin 1, deodorization and sterilization storehouse 11, liquid phase separation storehouse 2 and settling banker 3 are communicated with successively, be communicated with by the filter opening of arranging on the dividing plate 18 between solid phase separation bin 1 and the deodorization and sterilization storehouse 11, deodorization and sterilization storehouse 11 and liquid phase separation storehouse 2 also are communicated with by the runner on the dividing plate, and the runner of then offering by the dividing plate bottom between settling banker 3 and the liquid phase separation storehouse 2 is communicated with.
In the present embodiment, liquid phase separation storehouse 2 sidewall upper are provided with oil outlet 9, settling banker 3 sidewall upper are provided with water port 7 and oil discharge outlet 8, described water port 7 is communicated to the bottom of settling banker 3 by pipeline, oil discharge outlet 8 exceeds oil discharge outlet 8 and oil outlet 9 by the position of water port 7, oil discharge outlet 8 and oil outlet 9 places all are provided with valve, the valve at oil discharge outlet 8 and oil outlet 9 places is a magnetic valve, settling banker 3 inherent positions near oil discharge outlet 8 are provided with oil reservoir sensors A 10,2 inherent positions near oil outlet 9, liquid phase separation storehouse are provided with oil reservoir transmitter B17, the signal output of described oil reservoir sensors A 10 is connected on oil discharge outlet 8 place's valve control ends, and the output of the signal of oil reservoir transmitter B17 is connected on oil outlet 9 place's valve control ends.Above-mentioned oil discharge outlet 8 is than water port 7 low 3～10CM, and oil outlet 9 also than water port 7 low 3～10CM, so that realize that the collection of oil reservoir is thick, reaches high-level efficiency oily water separation.
The solid phase tripping device of solid phase separation bin 1 is a filter screen 6 in the present embodiment, and described filter screen 6 is divided into feed liquor storehouse 13 and fluid storehouse 14 with solid phase separation bin 1, and described feed liquor storehouse 13 is communicated with fluid inlet 15, and fluid storehouse 14 is communicated to deodorization and sterilization storehouse 11.
In the present embodiment, the bottom of solid phase separation bin 1, deodorization and sterilization storehouse 11, liquid phase separation storehouse 2 and settling banker 3 all is provided with exhaust-valve.
Claims (8)
1. potent water-and-oil separator, it is characterized in that, comprise solid phase separation bin (1), liquid phase separation storehouse (2) and settling banker (3), be provided with the liquid phase separation device in the described liquid phase separation storehouse (2), described liquid phase separation device comprises horizontal positioned and spaced waved plate (4), described waved plate (4) is the be separated cross section of storehouse (2) of covering liquid fully, and the cross section of waved plate (4) is sinusoidal shape, all is provided with through hole (5) on each waved plate (4).
2. separator according to claim 1, it is characterized in that, described solid phase separation bin (1), liquid phase separation storehouse (2) and settling banker (3) are positioned at same housing (16), the three separates by dividing plate, be communicated with by the filter opening of arranging on the dividing plate (18) between solid phase separation bin (1) and liquid phase separation storehouse (2), the runner of offering by the dividing plate bottom between settling banker (3) and liquid phase separation storehouse (2) is communicated with.
3. separator according to claim 2, it is characterized in that, described liquid phase separation storehouse (2) sidewall upper is provided with oil outlet (9), settling banker (3) sidewall upper is provided with water port (7) and oil discharge outlet (8), described water port (7) is communicated to the bottom of settling banker (3) by pipeline, oil discharge outlet (8) exceeds oil discharge outlet (8) and oil outlet (9) by the position of water port (7), and oil discharge outlet (8) and oil outlet (9) locate all to be provided with valve.
4. separator according to claim 3, it is characterized in that, the valve that described oil discharge outlet (8) and oil outlet (9) are located is a magnetic valve, the inherent position near oil discharge outlet (8) of settling banker (3) is provided with oil reservoir sensors A (10), inherent position near oil outlet (9), liquid phase separation storehouse (2) is provided with oil reservoir transmitter B(17), the output of the signal of described oil reservoir sensors A (10) is connected to oil discharge outlet (8) and locates on the valve control end oil reservoir transmitter B(17) signal output be connected to oil outlet (9) and locate on the valve control end.
5. according to the arbitrary described separator of claim 1～4, it is characterized in that also comprise a deodorization and sterilization storehouse (11), described deodorization and sterilization storehouse (11) is externally connected to an ozone generating apparatus (12).
6. according to the arbitrary described separator of claim 2～4, it is characterized in that, be provided with the solid phase tripping device in the described solid phase separation bin (1), described solid phase tripping device comprises filter screen (6), described filter screen (6) is divided into feed liquor storehouse (13) and fluid storehouse (14) with solid phase separation bin (1), described feed liquor storehouse (13) is communicated with fluid inlet (15), and fluid storehouse (14) are communicated to liquid phase separation storehouse (2).
7. according to the arbitrary described separator of claim 1～4, it is characterized in that the bottom of described solid phase separation bin (1), liquid phase separation storehouse (2) and settling banker (3) all is provided with exhaust-valve.
8. separator according to claim 5 is characterized in that, the bottom in described deodorization and sterilization storehouse (11) is provided with exhaust-valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320102840 CN203079767U (en) | 2013-03-07 | 2013-03-07 | Oil-water separator with strong effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320102840 CN203079767U (en) | 2013-03-07 | 2013-03-07 | Oil-water separator with strong effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203079767U true CN203079767U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320102840 Expired - Fee Related CN203079767U (en) | 2013-03-07 | 2013-03-07 | Oil-water separator with strong effect |
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| CN (1) | CN203079767U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649446A (en) * | 2013-11-15 | 2015-05-27 | 江苏克莱斯克能源装备有限公司 | Liquid-solid separation method and device for MTO (methanol to olefins) quenching water and washing water |
| CN107775786A (en) * | 2017-12-04 | 2018-03-09 | 中国三冶集团有限公司 | A kind of automatic spray health promotion system and spraying method |
| CN109761406A (en) * | 2019-03-21 | 2019-05-17 | 西南石油大学 | A kind of integral type oil-contained waste water treatment device |
| CN110314416A (en) * | 2019-08-12 | 2019-10-11 | 上海绿晟环保科技有限公司 | A kind of equipment for water-oil separating |
| CN110984091A (en) * | 2019-11-15 | 2020-04-10 | 国家电网有限公司 | Water and sewage separation device for pumped storage power station gravity drainage hole |
| CN112777770A (en) * | 2021-01-13 | 2021-05-11 | 李国平 | Portable outdoor micro-filtration purifier for water purification |
-
2013
- 2013-03-07 CN CN 201320102840 patent/CN203079767U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649446A (en) * | 2013-11-15 | 2015-05-27 | 江苏克莱斯克能源装备有限公司 | Liquid-solid separation method and device for MTO (methanol to olefins) quenching water and washing water |
| CN107775786A (en) * | 2017-12-04 | 2018-03-09 | 中国三冶集团有限公司 | A kind of automatic spray health promotion system and spraying method |
| CN107775786B (en) * | 2017-12-04 | 2023-11-17 | 中国三冶集团有限公司 | Automatic spraying health preserving system and spraying method |
| CN109761406A (en) * | 2019-03-21 | 2019-05-17 | 西南石油大学 | A kind of integral type oil-contained waste water treatment device |
| CN110314416A (en) * | 2019-08-12 | 2019-10-11 | 上海绿晟环保科技有限公司 | A kind of equipment for water-oil separating |
| CN110984091A (en) * | 2019-11-15 | 2020-04-10 | 国家电网有限公司 | Water and sewage separation device for pumped storage power station gravity drainage hole |
| CN112777770A (en) * | 2021-01-13 | 2021-05-11 | 李国平 | Portable outdoor micro-filtration purifier for water purification |
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Granted publication date: 20130724 Termination date: 20190307 |