CN108423897A - A kind of oiliness sewage treatment equipment and technique - Google Patents
A kind of oiliness sewage treatment equipment and technique Download PDFInfo
- Publication number
- CN108423897A CN108423897A CN201810229936.XA CN201810229936A CN108423897A CN 108423897 A CN108423897 A CN 108423897A CN 201810229936 A CN201810229936 A CN 201810229936A CN 108423897 A CN108423897 A CN 108423897A
- Authority
- CN
- China
- Prior art keywords
- demulsification
- waste water
- tank
- oily
- sewage treatment
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
Abstract
The invention discloses a kind of oiliness sewage treatment equipment and techniques.The oiliness sewage treatment equipment includes demulsification processing unit and oily-water seperating equipment, the demulsification processing unit includes demulsification tank, the demulsification tank is internally connected with ultrasonic generator and/or microwave generating apparatus, the demulsification tank connects the oily-water seperating equipment by high-pressure pump, and the waste water in the demulsification tank is pumped into the oily-water seperating equipment by the high-pressure pump.The process for treating oil-containing waste water includes the following steps：Demulsification processing is carried out to oily waste water by ultrasonic wave and/or microwave；Liquid after demulsification is subjected to water-oil separating.The present invention is demulsified to oily waste water by ultrasonic wave and/or microwave, and oil removal rate is enabled to improve.Two kinds of demulsification modes are physics demulsification, can be to avoid the use of chemical reagent, and to the secondary pollution for avoiding chemical reagent from generating, and the floor space of be demulsified tank, microwave generating apparatus and Bi-Cone Type Hydrocyclone is small, compared to traditional oil removing cost reduction.
Description
Technical field
The present invention relates to out of phase separation technology field more particularly to a kind of oiliness sewage treatment equipment and technique.
Background technology
Oily waste water mainly include the waste water in oil field, the waste water of oil plant, petrochemical plant waste water, oil truck cleaning
The water ballast of water and oil tanker, tank washings, engine room water etc..If oily waste water is not recycled, water resource can be caused
Waste, and if being discharged into river, lake or bay, meeting polluted-water influences aquatile existence, if filled for agricultural
It irrigates, oily substance can then block interstices of soil, interfere crop growth.Therefore, the processing of oily waste water should consider to recycle first
Oily substance.
Currently, oily waste water oil removing is mainly by oil separator and floation tank, i.e., the method for traditional " one is floating every two " into
Row oil removing, however the waste-oil scavenger of traditional " one is floating every two " takes up a large area, efficiency is low, with duration and of high cost and right
Oil emulsion in waste water is difficult to remove, and the waste water after de-oiling still contains certain oil emulsion.
Based on problem above, there is an urgent need for a kind of oiliness sewage treatment equipment and techniques, to solve oil removal efficiency in the prior art
Low, waste-oil scavenger takes up a large area, oil removing problem of high cost.
Invention content
It is low to solve oil removal efficiency in the prior art it is an object of the invention to propose a kind of oiliness sewage treatment equipment,
Waste-oil scavenger takes up a large area, oil removing problem of high cost.
It is another object of the present invention to propose a kind of process for treating oil-containing waste water, to improve oil removal efficiency.
For this purpose, the present invention uses following technical scheme：
A kind of oiliness sewage treatment equipment, including demulsification processing unit and oily-water seperating equipment, the demulsification processing unit
Including the tank that is demulsified, the demulsification tank is internally connected with ultrasonic generator and/or microwave generating apparatus, and the demulsification tank passes through height
Press pump connects the oily-water seperating equipment, and the waste water in the demulsification tank is pumped into the oily-water seperating equipment by the high-pressure pump.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, the ultrasonic generator includes being connected with each other
Ultrasonic transducer and supersonic generator, the ultrasonic transducer are arranged in the demulsification tank.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, the microwave generating apparatus includes waveguide and magnetic
Keyholed back plate, the waveguide stretch into the demulsification tank.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, first is provided on the oral siphon of the demulsification tank
Control valve and first flowmeter.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, the high-pressure pump and the oily-water seperating equipment it
Between along the flow direction of waste water be disposed with the second control valve, second flowmeter and pressure gauge.
Further include control unit as a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, described control unit connects
Connect the ultrasonic generator and/or the microwave generating apparatus.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, described control unit connects first control valve
With second control valve.
Further include the display for being connected with described control unit as a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment
Device, for the technological parameter during display processing.
As a kind of preferred embodiment of above-mentioned oiliness sewage treatment equipment, the oily-water seperating equipment includes hydraulic cyclone
Device, wastewater disposal basin and slop tank, the wastewater disposal basin are connect with the underflow pipe of the hydrocyclone, the slop tank and the waterpower
The overflow pipe of cyclone connects, and the liquid inlet of the hydrocyclone is connect with the high-pressure pump.
A kind of technique handled using above-mentioned oiliness sewage treatment equipment, is included the following steps：
Demulsification processing is carried out to oily waste water by ultrasonic wave and/or microwave；
Liquid after demulsification is subjected to water-oil separating.
As a kind of preferred embodiment of above-mentioned process for treating oil-containing waste water, the temperature range when demulsification is handled is 30-
40℃。
As a kind of preferred embodiment of above-mentioned process for treating oil-containing waste water, when by the ultrasonic dehydration, ultrasonic power
For 1000-1200W.
As a kind of preferred embodiment of above-mentioned process for treating oil-containing waste water, when by the microwave demulsifying, microwave power is
1500-1800W。
As a kind of preferred embodiment of above-mentioned process for treating oil-containing waste water, the oily waste water enters the stream of the demulsification tank
Amount is identical with the flow for entering the oily-water seperating equipment, and range of flow is 3.0-3.5m3/h。
Beneficial effects of the present invention：
The present invention is demulsified to oily waste water by ultrasonic wave and/or microwave, oil removal rate can be made to improve.Ultrasonic wave is broken
Newborn method is that the mechanical oscillation having using ultrasonic wave itself and heat effect are demulsified, and microwave demulsifying be using its fuel factor and
Non-thermal effect is demulsified.Two kinds of demulsification modes are physics demulsification, it is possible to reduce demulsifier reaches with or without the use of demulsifier
Demulsification avoids the use of chemical reagent, to avoid secondary pollution of the chemical reagent to waste water.Physics is demulsified and bicone
Hydrocyclone combines can significant raising water-oil separating efficiency.
When being demulsified jointly by ultrasonic wave and/or microwave, the oil removal rate containing waste water has reached 90% or more, relative to biography
" one is floating every two " oil removal rate 75% that technique oil removing reaches of system, largely improves the oil removal rate containing waste water, and
The floor space of the processing equipment of demulsification tank, ultrasonic generator, microwave generating apparatus and Bi-Cone Type Hydrocyclone composition
It is small, compared to traditional oil removing cost reduction.
Description of the drawings
Fig. 1 is the oiliness sewage treatment equipment with ultrasonic generator that the embodiment of the present invention one provides；
Fig. 2 is the oiliness sewage treatment equipment provided by Embodiment 2 of the present invention with microwave generating apparatus；
Fig. 3 is the oiliness sewage treatment with ultrasonic generator and microwave generating apparatus that the embodiment of the present invention three provides
Equipment.
In figure：
1, be demulsified tank；2, ultrasonic generator；3, microwave generating apparatus；4, oily-water seperating equipment；5, control unit；6, it shows
Show device；
11, oral siphon；111, the first control valve；112, first flowmeter；
12, outlet pipe；121, high-pressure pump；122, the second control valve；123, second flowmeter；124, pressure gauge；
21, ultrasonic transducer；22, supersonic generator；23, holder；
31, waveguide；32, magnetron；
41, Bi-Cone Type Hydrocyclone；42, wastewater disposal basin；43, slop tank.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
The present embodiment proposes a kind of oiliness sewage treatment equipment, as shown in Figure 1, the oiliness sewage treatment equipment includes demulsification
Processing unit and oily-water seperating equipment 4, demulsification processing unit include demulsification tank 1, and demulsification tank 1 is internally connected with ultrasonic generator
2, demulsification tank 1 is also associated with oral siphon 11 and outlet pipe 12, and outlet pipe 12 is high for connecting demulsification tank 1 and oily-water seperating equipment 4
Press pump 121 is arranged on the outlet pipe 12 of demulsification tank 1, and the waste water being demulsified in tank 1 is pumped into oily-water seperating equipment 4 by high-pressure pump 121.
Oily-water seperating equipment 4 in the present embodiment includes Bi-Cone Type Hydrocyclone 41, the underflow pipe of the Bi-Cone Type Hydrocyclone 41
It is connect with wastewater disposal basin 42, the waste water of separation is discharged into wastewater disposal basin 42 by underflow pipe, overflow pipe is connect with slop tank 43, by separation
Sump oil is discharged into slop tank 43.
Ultrasonic dehydration is that the mechanical oscillation having using ultrasonic wave itself and heat effect are demulsified, and utilizes the energy of sound wave
Amount destroys the interfacial film of grease, so that hydrone is broken through surface tension of oil membrane, freely moves up and down, magnetic is hit, is coalesced to reach grease
Separation can reach demulsification in the case where reduction demulsifier is with or without the use of demulsifier.
The oily substance in oily waste water after demulsification exists in the form of oil slick, and Bi-Cone Type Hydrocyclone 41 utilizes grease
The density of two-phase is different, and suffered centrifugal force difference comes oil-water separation mixture, physics demulsification and 41 knot of Bi-Cone Type Hydrocyclone
It closes and uses, can significantly improve water-oil separating efficiency.By ultrasonic dehydration, the oil removal rate containing waste water reached 91% with
On, relative to traditional " one is floating every two " oil removal rate 75% that technique oil removing reaches, largely improve containing waste water
Oil removal rate, and the floor space of be demulsified tank 1, ultrasonic generator 2 and Bi-Cone Type Hydrocyclone 41 is small, is removed compared to tradition
Oily cost reduction.
Specifically, ultrasonic generator 2 includes the ultrasonic transducer 21 being connected with each other and supersonic generator 22, ultrasound
The setting of wave transducer 21 is being demulsified in tank 1, and is supported by holder 23.
The oil-containing waste water treating device includes control unit 5, and control unit 5 is connect with supersonic generator 22, and control is super
Whether sonic generator 22 works, to control the working condition of ultrasonic transducer 21 by supersonic generator 22.
11 upper edge of oral siphon of demulsification tank 1 enters water direction and is disposed with the first control valve 111 and first flowmeter 112,
The flow direction of 12 upper edge waste water of outlet pipe between high-pressure pump 121 and Bi-Cone Type Hydrocyclone 41 is disposed with the second control
Valve 122, second flowmeter 123 and pressure gauge 124 processed.Control unit 5 connects the first control valve 111 and the second control valve 122.Control
Unit 5 processed is used to control the aperture of the first control valve 111 and the second control valve 122, to control waste water enter be demulsified tank 1 and
Flow when into Bi-Cone Type Hydrocyclone 41.
First flowmeter 112, second flowmeter 123 and pressure gauge 124 are respectively used to display oily waste water and enter demulsification tank
1 flow, into oily-water seperating equipment 4 flow and demulsification tank 1 and Bi-Cone Type Hydrocyclone 41 between pipeline on
Pressure value.So that operating personnel can intuitively obtain the specific numerical value of corresponding parameter.
Further include display 6 in the equipment, connect control unit 5, control unit 5 controls the display of display 6 for showing
The flow value of first control valve 111 and the second control valve 122, moreover it is possible to show the parameters such as time, temperature.
The present embodiment also proposes a kind of technique handled using oiliness sewage treatment equipment, includes the following steps：
Control demulsification tank 1 in temperature be maintained at 30-40 DEG C, be specifically as follows 31 DEG C, 32 DEG C, 33 DEG C, 34 DEG C, 35 DEG C,
36 DEG C, 37 DEG C, 38 DEG C or 39 DEG C；
Control ultrasonic transducer 21 sends out ultrasonic wave and carries out demulsification processing, ultrasonic work(to the oily waste water in demulsification tank 1
Rate is 1000-1200W, is specifically as follows 1100W；
Bi-Cone Type Hydrocyclone 41 will be pumped by high-pressure pump 121 after demulsification, it is right by Bi-Cone Type Hydrocyclone 41
Oily waste water after demulsification carries out water-oil separating.
The flow that oily waste water enters demulsification tank 1 is identical with the flow for entering oily-water seperating equipment 4, and range of flow is
3.0-3.5m3/h.Flow in the range when, can ensure that oil-water separation is more preferable.Specific flow can be 3.1m3/h、
3.2m3/h、3.3m3/ h or 3.4m3/h。
Embodiment two
Oiliness sewage treatment equipment in the present embodiment with embodiment one the difference is that, as shown in Fig. 2, oily waste water
Ultrasonic generator in processing equipment is changed to microwave generating apparatus 3, and microwave generating apparatus 3 includes waveguide 31 and magnetic control
Pipe 32, waveguide 31 stretch into demulsification tank 1, and in the top of demulsification tank 1, and control unit 5 connects magnetron 32.Microwave demulsifying
It is to be demulsified using fuel factor and non-thermal effect, by destroying the interfacial film of grease, so that hydrone is broken through surface tension of oil membrane, certainly
By moving up and down, magnetic is hit, is coalesced to reach water-oil separating, microwave demulsifying can reduce demulsifier with or without the use of demulsifier
Reach demulsification.The oily substance in oily waste water after demulsification exists in the form of oil slick, 41 profit of Bi-Cone Type Hydrocyclone
Different with the density of water-oil phase, suffered centrifugal force difference comes oil-water separation mixture, physics demulsification and bicone hydraulic cyclone
Device 41 combines can significant raising water-oil separating efficiency.When passing through microwave demulsifying, the oil removal rate containing waste water reaches
92% or more, relative to the oil removal rate 75% that traditional " one is floating every two " technique oil removing reaches, largely improve containing
The oil removal rate of waste water, and the floor space of be demulsified tank 1, microwave generating apparatus 3 and Bi-Cone Type Hydrocyclone 41 is small, compares
Traditional oil removing cost reduction.
Correspondingly, process for treating oil-containing waste water and embodiment one the difference is that, sent out by controlling microwave generator
Microwave to demulsification tank 1 in oily waste water carry out demulsification processing, microwave power 1500-1800W is specifically as follows 1600W.
Embodiment three
Oiliness sewage treatment equipment in the present embodiment with embodiment one the difference is that, as shown in figure 3, oily waste water
Include simultaneously ultrasonic generator 2 and microwave generating apparatus 3 in processing equipment, while by ultrasonic wave and microwave to oily waste water
It is demulsified, oil removal rate is enabled to improve.Ultrasonic dehydration method is that the mechanical oscillation having using ultrasonic wave itself and heat are made
With being demulsified, and microwave demulsifying is demulsified using its fuel factor and non-thermal effect.Two kinds of demulsification modes are physics demulsification, can
Reach demulsification with or without the use of demulsifier with reduce demulsifier, the use of chemical reagent is avoided, to avoid chemistry
Secondary pollution of the reagent to waste water.Physics demulsification is used in combination with Bi-Cone Type Hydrocyclone 41, can significant raising oil
Water separative efficiency.When being demulsified jointly by ultrasonic wave and microwave, the oil removal rate containing waste water has reached 93% or more, relative to biography
" one is floating every two " oil removal rate 75% that technique oil removing reaches of system, largely improves the oil removal rate containing waste water, and
Tank 1, ultrasonic generator 2, the floor space of microwave generating apparatus 3 and Bi-Cone Type Hydrocyclone 41 of being demulsified are small, compared to passing
System oil removing cost reduction.
Table one is the oil removal rate that oil removing is carried out using different process.It is shown in table one through ultrasonic wave or microwave demulsifying
The technique that technique carry out after demulsification processing oil removing is improved compared to the oil removal rate of " one is floating every two " technique in traditional handicraft
Nearly 20%, therefore, the processing equipment and technique of the oily waste water in the present invention can significantly improve water-oil separating efficiency.And
And it is compared and ultrasonic emulsion breaking or microwave is used alone it is found that when ultrasonic emulsion breaking and microwave demulsifying are carried out at the same time demulsification by one result of table
Being demulsified, the oil removal rate made is high, and therefore, while by ultrasonic emulsion breaking and microwave demulsifying, water-oil separating is more thorough.
Table one
Note that above are only presently preferred embodiments of the present invention.It will be appreciated by those skilled in the art that the present invention is not limited to here
Specific embodiment, can carry out for a person skilled in the art it is various it is apparent variation, readjust and substitute without
It is detached from protection scope of the present invention.Therefore, although being described in further detail to the present invention by above example,
The present invention is not limited only to above example, can also include that more other are equivalent without departing from the inventive concept
Embodiment, and the scope of the present invention is determined by scope of the appended claims.
Claims (14)
1. a kind of oiliness sewage treatment equipment, which is characterized in that described including demulsification processing unit and oily-water seperating equipment (4)
The processing unit that is demulsified includes demulsification tank (1), and the demulsification tank (1) is internally connected with ultrasonic generator (2) and/or microwave occurs
Device (3), the demulsification tank (1) connect the oily-water seperating equipment (4) by high-pressure pump (121), and the high-pressure pump (121) will
Waste water in the demulsification tank (1) is pumped into the oily-water seperating equipment (4).
2. oiliness sewage treatment equipment according to claim 1, which is characterized in that the ultrasonic generator (2) includes
The ultrasonic transducer (21) and supersonic generator (22) of interconnection, the ultrasonic transducer are arranged in the demulsification tank
(1) in.
3. oiliness sewage treatment equipment according to claim 1, which is characterized in that the microwave generating apparatus (3) includes
The waveguide (31) and magnetron (32) of interconnection, the waveguide (31) are stretched into the demulsification tank (1).
4. oiliness sewage treatment equipment according to claim 1, which is characterized in that the oral siphon of the demulsification tank (1)
(11) the first control valve (111) and first flowmeter (112) are provided on.
5. oiliness sewage treatment equipment according to claim 4, which is characterized in that the high-pressure pump (121) and the oil
Between water separation device (4) along the flow direction of waste water be disposed with the second control valve (122), second flowmeter (123) and
Pressure gauge (124).
6. oiliness sewage treatment equipment according to claim 5, which is characterized in that further include control unit (5), the control
Unit (5) processed connects the ultrasonic generator (2) and/or the microwave generating apparatus (3).
7. oiliness sewage treatment equipment according to claim 6, which is characterized in that described in described control unit (5) connection
First control valve (111) and second control valve (122).
8. oiliness sewage treatment equipment according to claim 6, which is characterized in that further include being connected with described control unit
(5) display (6), for the technological parameter during display processing.
9. oiliness sewage treatment equipment according to claim 1, which is characterized in that the oily-water seperating equipment includes waterpower
Cyclone, wastewater disposal basin (42) and slop tank (43), the wastewater disposal basin (42) connect with the underflow pipe of the hydrocyclone, described
Slop tank (43) is connect with the overflow pipe of the hydrocyclone, the liquid inlet of the hydrocyclone and the high-pressure pump
(121) it connects.
10. a kind of technique handled using claim 1-9 any one of them oiliness sewage treatment equipment, feature are existed
In including the following steps：
Demulsification processing is carried out to oily waste water by ultrasonic wave and/or microwave；
Liquid after demulsification is subjected to water-oil separating.
11. process for treating oil-containing waste water according to claim 10, which is characterized in that the temperature model when demulsification processing
Enclose is 30-40 DEG C.
12. process for treating oil-containing waste water according to claim 11, which is characterized in that when by the ultrasonic dehydration,
Ultrasonic power is 1000-1200W.
13. process for treating oil-containing waste water according to claim 11, which is characterized in that micro- when by the microwave demulsifying
Wave power is 1500-1800W.
14. process for treating oil-containing waste water according to claim 10, which is characterized in that the oily waste water enters described broken
The flow of newborn tank (1) is identical with the flow for entering the oily-water seperating equipment (4), and range of flow is 3.0-3.5m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229936.XA CN108423897A (en) | 2018-03-20 | 2018-03-20 | A kind of oiliness sewage treatment equipment and technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229936.XA CN108423897A (en) | 2018-03-20 | 2018-03-20 | A kind of oiliness sewage treatment equipment and technique |
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| Publication Number | Publication Date |
|---|---|
| CN108423897A true CN108423897A (en) | 2018-08-21 |
Family
ID=63158563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810229936.XA Pending CN108423897A (en) | 2018-03-20 | 2018-03-20 | A kind of oiliness sewage treatment equipment and technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436682A (en) * | 2019-07-06 | 2019-11-12 | 中海石油（中国）有限公司天津分公司 | A kind of offshore oilfield returns drain advanced treatment process |
| CN111252970A (en) * | 2020-02-13 | 2020-06-09 | 湛江远通高新技术有限公司 | Oil-water separation method for oily sewage of ship |
| CN114593431A (en) * | 2022-03-04 | 2022-06-07 | 山东环沃环保科技有限公司 | System and method for enhancing atomization effect of oily wastewater by using microwaves |
| CN114735868A (en) * | 2022-04-20 | 2022-07-12 | 武汉理工大学 | Comprehensive treatment device for petrochemical wastewater |
| WO2023071092A1 (en) * | 2021-10-25 | 2023-05-04 | 海南海嘉惠科技有限公司 | Process of treating ageing oil by electron beam irradiation |
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| CN110436682A (en) * | 2019-07-06 | 2019-11-12 | 中海石油（中国）有限公司天津分公司 | A kind of offshore oilfield returns drain advanced treatment process |
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Application publication date: 20180821 |
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