CN110451717A - Oily wastewater outlet treatment process and device - Google Patents
Oily wastewater outlet treatment process and device Download PDFInfo
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- CN110451717A CN110451717A CN201910671125.XA CN201910671125A CN110451717A CN 110451717 A CN110451717 A CN 110451717A CN 201910671125 A CN201910671125 A CN 201910671125A CN 110451717 A CN110451717 A CN 110451717A
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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
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
- C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
- C12N11/08—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a synthetic polymer
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/782—Ozone generators
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/341—Consortia of bacteria
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Abstract
The present invention relates to oily wastewater outlet processing technique up to standard more particularly to a kind of oily wastewater outlet treatment process and devices.Its process flow is after water enters conditioning tank even regulation, it is lifted into ultrasound-enhanced ozone reaction tower by design discharge, strengthen ozone mass transfer using the mechanical concussion that sound wave is formed, strengthen OH using ultrasonic cavitation to generate, the degradation for realizing macromolecular oil in sewage is aoxidized using OH, improves biochemical sewage；Sewage enters A/O biochemical processing process after pretreatment, A sections, adds carrier filler, converts small molecular organic acid for larger molecular organics using anaerobic bacteria, further increases Biodegradability of Wastewater simultaneously reducing organic concentration；O sections, fixed oil degradation bacteria filler is added, converts CO for Petroleum concentration substance in water using oil degradation bacteria2And H2O, after processing sewage enter secondary settling tank separation of solid and liquid, wherein flowable sludge reflux arrive anoxic pond, excess sludge transport outward, supernatant standard discharge.
Description
Technical field
The present invention relates to oily wastewater outlet processing technique up to standard more particularly to a kind of oily wastewater outlet treatment process
And device.
Background technique
Treatment Techniques of Extracted Water from Crude Oil Production is to keep crude oil stable high yield, all various aspects such as preserve the ecological environment to play important
Effect.In large scale, system has been built up in order to meet oil-contaminated water of oil field processing and the requirement of waterflooding extraction, oilfield surface engineering
Complicated sewage disposal system.It is divided by recovered water source difference: water drive sewage, polymer-flooding sewage, high concentration polymer-flooding sewage, ternary
Drive sewage.Enter the middle and later periods with oil field development, Produced Liquid moisture content gradually increases, and oily wastewater yield is caused to be incremented by.Re-injection
Sewage problem of outlet can not be solved, advanced treating outlet is the following developing direction.
Current existing outlet processing method has physical method and chemical method, and the deficiency of both methods is: technique stream
Journey is complicated, treatment effeciency is low, energy consumption is high, investment is big；Sewage treatment is restrict to send out to more efficient, more energy efficient, more inexpensive direction
Exhibition.
Summary of the invention
In order to realize that oil-contaminated water of oil field standard discharge is handled, it is complicated to solve existing process flow at present, treatment effeciency is low,
The deficiency that energy consumption is high, investment is big, the present invention provide a kind of oily wastewater outlet treatment process and device.Technology utilization ultrasound is strong
Change ozone oxidation degradation of organic substances improved effect water quality biodegradability, utilizes screening oil degradation bacteria, carrier filler and immobilization
Technology improves biocompatibility, guarantees oily wastewater processing up to standard.
Present invention provide the technical scheme that a kind of oily wastewater outlet treatment process, comprises the following steps that:
Step 1: oilfield sewage through sedimentation and filtration treatment after, flow into conditioning tank, in conditioning tank to water quality, water,
Even water temperature is adjusted；
Step 2: being lifted into ultrasound-enhanced ozone reaction tower by design discharge by pumping through step 1 treated sewage,
Mechanical concussion effect is formed using high-frequency sound wave in tower and strengthens ozone mass transfer, is strengthened OH using ultrasonic cavitation and is generated,
Using adduction, substitution, electronics transfer, the scission of link etc. between OH and organic compound, keep macromolecular difficult to degrade in sewage organic
Object oxidative degradation becomes low toxicity or nontoxic small-molecule substance, improves biochemical sewage；
Step 3: through step 2, treated that sewage enters A/O biochemical processing process；A sections, sewage enters anaerobic pond, to
Immobilization anaerobic bacteria carrier is put into anaerobic pond, is come into full contact with the organic matter in sewage with the anaerobic bacteria on carrier and is reacted, it will
Larger molecular organics are converted into small molecular organic acid, further increase the biodegradability of sewage simultaneously in reduction organic concentration；O
Section, A section treated that sewage enters aerobic tank, and into aerobic tank, investment immobilization oil degradation bacteria carrier, makes petroleum in sewage
Pollutant comes into full contact with the oil degradation bacteria on carrier to react, and converts CO for petroleum hydrocarbons2And H2O；Treated
High nitrogen-containing wastewater flows back into anaerobic pond；
Step 4: through step 3 treated low ammonia-nitrogen sewage enters secondary settling tank, sewage is solid after the sedimentation of secondary settling tank waterpower
Liquid separation, wherein the preferable sludge reflux of upper layer mobility to anaerobic pond, remaining base sludge outward transport, supernatant reach level-one A
The direct outlet of standard.
A sections of the A/O biochemical processing process, wherein the carrier filler of anaerobic bacteria is polyurethane foam；
The process for fixation of O sections of the A/O biochemical processing process, the immobilization oil degradation bacteria carrier is: will be dense
1:1 is mixed polyvinyl alcohol (PVA) aqueous solution that degree is 16% at 25 DEG C by volume with bacterium solution；By carrier clean drying after with
It after mixed liquor is mixed evenly by the volume ratio of 1:4, adsorbs 40 minutes at room temperature, with saturation boric acid crosslinking after the completion of absorption
48 hours, it during which need to periodically be stirred and respectively be washed three times with physiological saline and tap water, finally be shaped into fixed fossil
Oily degradation bacteria carrier；
The oil degradation bacteria is that the preferred oil degradation strain for spreading cultivation out is screened from oily wastewater, comprising small
Bacillus (Exiguobacterium) and acinetobacter (Acinetobacter) belong to exclusive oil degradation bacteria.
Processing unit used in a kind of oily wastewater outlet treatment process, including conditioning tank, ultrasound-enhanced ozone reaction tower,
Anaerobic pond, aerobic tank and secondary settling tank, five pass sequentially through piping connection and are controlled by valve, the ultrasound-enhanced ozone reaction
The water inlet of tower is located at top, and water outlet is located at bottom end, and the sewage in conditioning tank is by pumping from ultrasound-enhanced ozone reaction tower
Water inlet is squeezed into, and is equipped with water distributor below water inlet, is equipped with ultrasound in the ultrasound-enhanced ozone reaction tower below water distributor
Wave producer forms ultrasonic field, and the jet aerator is fixedly mounted below the ultrasonic field, and the ozone occurs
Device is arranged outside ultrasound-enhanced ozone reaction tower, and ozone generator is connected by pipeline with jet aerator, ultrasound-enhanced
Ozone reaction tower upper end bypass has offgas outlet pipe, is serially connected with exhaust gas processing device on the offgas outlet pipe；Described is aerobic
Aerator is installed in pond.
There are two the supersonic generators, and orthogonal thereto installation forms orthogonal ultrasonic field.
The invention has the benefit that
(1) ozone mass transfer is strengthened in the mechanical concussion effect that the present invention is formed using sound wave, strong using ultrasonic cavitation
Change OH to generate, the free radical OH with extremely strong oxidability is turned by adduction, substitution, the electronics between organic compound
Shifting, scission of link etc. make larger molecular organics oxidative degradation difficult to degrade in sewage become low toxicity or nontoxic small molecular organic acid,
It can significantly improve the biodegradability of sewage.
(2) present invention use biologic treating technique, using microorganism vital movement in sewage be in solubilised state or colloid
The organic pollutant degradation of state acts on, so that waste water be made to be purified, the advantages of biologic treating technique be consume less, efficiency
It is high, at low cost, technological operation is convenient for management reliable and without secondary pollution.
(3) A sections of A/O biochemical processing process in the present invention, the carrier filler of anaerobic bacteria is polyurethane foam, carrier filler table
Area is big, solubization is good, complete fluidisation, biofilm is rapid, bioactivation is had excellent performance, mass transfer effect is good, treatment effeciency is high, can be big
Amplitude improve participate in reaction microorganism concn, and then in lifting sewage organic matter degradation effect.
(4) O sections of A/O biochemical processing process in the present invention, polyvinyl alcohol immobilized technology can further improve microorganism
Quantity and vigor are separated by solid-liquid separation and are easy, and secondary pollution is few, realize the maximization of biomass, bioactivity and mass-transfer efficiency, high
Petroleum hydrocarbons in effect processing sewage.
Detailed description of the invention
Fig. 1 is oil-containing sewage treatment technique flow chart of the present invention.
Fig. 2 is the structural schematic diagram of ultrasound-enhanced ozone reaction tower in the present invention.
Fig. 3 is the process for fixation of immobilization oil degradation bacteria carrier in the present invention.
In figure: 1.-water inlet；2. water outlet；3. ozone generator；4. supersonic generator；5. jet aerator；
6. water distributor；7. offgas outlet pipe；8. exhaust gas processing device.
Specific embodiment
The present invention is described further below in conjunction with attached drawing:
In conjunction with attached drawing 1, a kind of oily wastewater outlet treatment process the following steps are included:
Step 1: oilfield sewage through sedimentation and filtration treatment after, flow into conditioning tank, in conditioning tank to water quality, water,
Even water temperature is adjusted；Water quality, the even regulation of water temperature are conducive to the more uniform of next step sewage purification.
Step 2: treated that sewage is lifted into ultrasound-enhanced ozone reaction tower by design discharge by pumping for step 1, benefit
Mechanical concussion effect is formed with high-frequency sound wave in tower and strengthens ozone mass transfer, is strengthened OH using ultrasonic cavitation and is generated, benefit
With adduction, substitution, electronics transfer, the scission of link etc. between OH and organic compound, make larger molecular organics difficult to degrade in sewage
Oxidative degradation becomes low toxicity or nontoxic small-molecule substance, improves biochemical sewage.
Step 3: the sewage of step 2 processing enters A/O biochemical processing process；A sections, sewage enters anaerobic pond, controls DO
(dissolved oxygen)≤0.5mg/L, microorganism are in anaerobic condition, and immobilization anaerobic bacteria carrier is put into anaerobic pond, is made in sewage
Organic matter come into full contact with and react with the anaerobic bacteria on carrier, wherein the carrier filler of anaerobic bacteria is polyurethane foam, surface area
Greatly, solubization it is good, it is complete fluidisation, biofilm it is rapid, the biomembrane of 2~3mm thickness can be quickly formed on surface layer, macromolecular is organic
Object is converted into small molecular organic acid, further increases the biodegradability of sewage simultaneously in reduction organic concentration；O sections, A sections of processing
Sewage afterwards enters aerobic tank, and organic concentration has declined to a great extent at this time, by aeration guarantee DO (dissolved oxygen) value stablize 2~
4mg/L, microorganism are in aerobic state, and immobilization oil degradation bacteria carrier is put into aerobic tank, keep petroleum-type in sewage dirty
Dye object comes into full contact with the oil degradation bacteria on carrier to react, and converts CO for petroleum hydrocarbons2And H2O；Treated, and height contains
Ammonia nitrogen waste water flows back into anaerobic pond.
Step 4: the low nitrogen-containing wastewater stream that step 3 obtains enters secondary settling tank, and mixed liquor is after the sedimentation of secondary settling tank waterpower
It is separated by solid-liquid separation, wherein mobility preferable sludge in upper layer flows back into anaerobic pond, remaining base sludge outward transport again, and supernatant reaches
The direct outlet of level-one A standard.
Referring to attached drawing 3, O sections of A/O biochemical processing process, the process for fixation of the immobilization oil degradation bacteria carrier
Be: 1:1 is mixed polyvinyl alcohol (PVA) aqueous solution for being 16% by concentration at 25 DEG C by volume with bacterium solution；Carrier is cleaned
It after being mixed evenly with mixed liquor by the volume ratio of 1:4 after drying, adsorbs 40 minutes at room temperature, with saturation after the completion of absorption
Boric acid is crosslinked 48 hours, during which need to be periodically stirred and respectively be washed three times with physiological saline and tap water, is finally shaped into
Immobilization oil degradation bacteria carrier.The immobilization technology can further improve the quantity and vigor of microorganism, is separated by solid-liquid separation and is easy,
Secondary pollution is few, realizes the maximization of biomass, bioactivity and mass-transfer efficiency, Petroleum concentration in efficient sewerage processing
Object.
The oil degradation bacteria is that the preferred oil degradation strain for spreading cultivation out is screened from oily wastewater, comprising small
Bacillus (Exiguobacterium) and acinetobacter (Acinetobacter), belong to exclusive oil degradation bacteria, to petroleum
Degradation capability is strong, degradation rate is fast, petroliferous waste water can be effectively treated.
Preparation facilities used in a kind of oily wastewater outlet treatment process, including conditioning tank, ultrasound-enhanced ozone reaction tower,
Anaerobic pond, aerobic tank and secondary settling tank, five pass sequentially through piping connection and are controlled by valve.Fig. 2 is that ultrasound-enhanced ozone is anti-
The structural schematic diagram of tower is answered, the water inlet 1 of the ultrasound-enhanced ozone reaction tower is located at top, and water outlet 2 is located at bottom end, adjusts
Sewage in pond is squeezed by pump from the water inlet 1 of ultrasound-enhanced ozone reaction tower, and water distributor 6 is equipped with below water inlet 1, is made
Sewage is uniformly distributed in tank, is from top to bottom flowed, and is equipped with ultrasonic wave in the ultrasound-enhanced ozone reaction tower of 6 lower section of water distributor
Generator 4, there are two the supersonic generators 4, orthogonal thereto installation, forms orthogonal ultrasonic field, the jet aerator 5
It being fixedly mounted below the orthogonal ultrasonic field, the ozone generator 3 is arranged outside ultrasound-enhanced ozone reaction tower,
Ozone generator 3 is connected by pipeline with jet aerator 5, passes through jet aerator 5 by the ozone that ozone generator 3 generates
40um ozone bubble is formed afterwards to be uniformly distributed in tank, is generated OH, is flowed from the bottom to top, sufficiently connects with the sewage by flowing under upper
Oxidation reaction occurs after touch, using adduction, substitution, electronics transfer, the scission of link etc. between OH and organic compound, it is difficult in sewage to make
The larger molecular organics oxidative degradation of degradation becomes low toxicity or nontoxic small-molecule substance.Quadrature arrangement ultrasonic transmitter, benefit
It is respectively that 24,40kHz is ultrasonically formed crossed field with frequency, makes sewage that ultrasonic cavitation, mechanical concussion effect occur, improve ozone and pass
Matter and OH yield, the biodegradability ultrasound-enhanced ozone reaction tower upper end bypass for further increasing sewage have offgas outlet pipe 7,
It is serially connected with exhaust gas processing device on the offgas outlet pipe 7, the sewage outflow after ultrasonic ozone acts on enters lower one of technique
Program, ozone tail gas are discharged by offgas outlet pipe 7, by using manganese dioxide be matrix and filler as at the tail gas of catalyst
Device 8 is managed, outlet after catalytic decomposition processing is carried out to ozone tail gas.Aerator is installed in the aerobic tank, passes through exposure
Gas guarantees that DO value is stablized in 2~4mg/L.
The present invention handles oily wastewater plus microbial process using ozone pre-oxidation, uses during ozone pre-oxidation
Jet aerator 5 cooperates ultrasonic vibration, greatly improves the degradation efficiency of dirty Organic substance in water, makes sewage at microbial process
Good biodegradability is had been provided with before reason；In microbial process processing, spread cultivation out further through selecting to screen from oily wastewater
The preferred oil degradation strain come, targetedly degrades to petroleum hydrocarbons, reaches degradation effect most preferably, simultaneously
The surface area for carrying microbial immobilization carrier is big, solubization is good, complete fluidisation, biofilm are rapid, can further be promoted micro-
The efficiency of biological method processing sewage.In conclusion mixed processing mode is more preferable to the clean-up effect of sewage, and microbial process
It is less energy consumption, at low cost, it is more suitable for promoting the use of.
Claims (6)
1. a kind of oily wastewater outlet treatment process, it is characterised in that: comprise the following steps that:
Step 1: oilfield sewage flows into conditioning tank, to water quality, water, water temperature in conditioning tank by settling with after filtration treatment
Even regulation；
Step 2: it is lifted into ultrasound-enhanced ozone reaction tower, is utilized by pumping by design discharge through step 1 treated sewage
High-frequency sound wave forms mechanical concussion effect and strengthens ozone mass transfer in tower, strengthens OH using ultrasonic cavitation and generates, benefit
With adduction, substitution, electronics transfer, the scission of link etc. between OH and organic compound, make larger molecular organics difficult to degrade in sewage
Oxidative degradation becomes low toxicity or nontoxic small-molecule substance, improves biochemical sewage；
Step 3: through step 2, treated that sewage enters A/O biochemical processing process；A sections, sewage enters anaerobic pond, to anaerobism
Immobilization anaerobic bacteria carrier is put into pond, is come into full contact with the organic matter in sewage with the anaerobic bacteria on carrier and is reacted, will divide greatly
Sub- organic matter is converted into small molecular organic acid, further increases the biodegradability of sewage simultaneously in reduction organic concentration；O sections, A
Treated that sewage enters aerobic tank for section, and immobilization oil degradation bacteria carrier is put into aerobic tank, keeps petroleum-type in sewage dirty
Dye object comes into full contact with the oil degradation bacteria on carrier to react, and converts CO for petroleum hydrocarbons2And H2O；Treated, and height contains
Ammonia nitrogen waste water flows back into anaerobic pond；
Step 4: through step 3 treated low ammonia-nitrogen sewage enters secondary settling tank, sewage solid-liquid point after the sedimentation of secondary settling tank waterpower
From wherein the preferable sludge reflux of upper layer mobility to anaerobic pond, remaining base sludge outward transport, supernatant reach level-one A standard
Direct outlet.
2. a kind of oily wastewater outlet treatment process according to claim 1, it is characterised in that: the A/O biochemical treatment
A sections of technique, wherein the carrier filler of anaerobic bacteria is polyurethane foam.
3. a kind of oily wastewater outlet treatment process according to claim 1, it is characterised in that: the A/O biochemical treatment
O sections of technique, the process for fixation of the immobilization oil degradation bacteria carrier is: the polyvinyl alcohol (PVA) for being 16% by concentration
1:1 is mixed aqueous solution at 25 DEG C by volume with bacterium solution；Carrier is cleaned and is mixed with mixed liquor by the volume ratio of 1:4 after drying
After mixing evenly, it adsorbs 40 minutes at room temperature, is crosslinked 48 hours after the completion of absorption with saturation boric acid, during which need to periodically be stirred
It mixes and is respectively washed three times with physiological saline and tap water, be finally shaped into immobilization oil degradation bacteria carrier.
4. a kind of oily wastewater outlet treatment process according to claim 1 or 3, it is characterised in that: the petroleum drop
Solution bacterium is that the preferred oil degradation strain for spreading cultivation out is screened from oily wastewater, includes Exiguobacterium sp category
(Exiguobacterium) and acinetobacter (Acinetobacter), belong to exclusive oil degradation bacteria.
5. processing unit used in a kind of oily wastewater outlet treatment process according to claim 1, it is characterised in that: packet
Conditioning tank, ultrasound-enhanced ozone reaction tower, anaerobic pond, aerobic tank and secondary settling tank are included, five pass sequentially through piping connection and pass through
Valve control, the water inlet (1) of the ultrasound-enhanced ozone reaction tower are located at top, and water outlet (2) is located at bottom end, in conditioning tank
Sewage squeezed by pump from the water inlet (1) of ultrasound-enhanced ozone reaction tower, water distributor (6) are installed below water inlet (1),
It is equipped with supersonic generator (4) in ultrasound-enhanced ozone reaction tower below water distributor (6), forms ultrasonic field, described penetrates
Stream aerator (5) is fixedly mounted below the ultrasonic field, and the ozone generator (3) setting is anti-in ultrasound-enhanced ozone
It answers outside tower, ozone generator (3) is connected by pipeline with jet aerator (5), by ultrasound-enhanced ozone reaction tower upper end
It is connected with offgas outlet pipe (7), is serially connected with exhaust gas processing device (8) on the offgas outlet pipe (7)；Installation in the aerobic tank
There is aerator.
6. processing unit used in a kind of oily wastewater outlet treatment process according to claim 5, which is characterized in that institute
There are two the supersonic generators (4) stated, and orthogonal thereto installation forms orthogonal ultrasonic field.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910671125.XA CN110451717A (en) | 2019-07-24 | 2019-07-24 | Oily wastewater outlet treatment process and device |
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| CN201910671125.XA CN110451717A (en) | 2019-07-24 | 2019-07-24 | Oily wastewater outlet treatment process and device |
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| CN110451717A true CN110451717A (en) | 2019-11-15 |
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| CN201910671125.XA Pending CN110451717A (en) | 2019-07-24 | 2019-07-24 | Oily wastewater outlet treatment process and device |
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Cited By (2)
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| CN111138026A (en) * | 2019-12-13 | 2020-05-12 | 陕西速源节能科技有限公司 | Oil field wastewater treatment method based on environmental protection |
| CN113105063A (en) * | 2020-01-13 | 2021-07-13 | 中国石油天然气股份有限公司 | Oil extraction sewage treatment process |
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| CN111138026A (en) * | 2019-12-13 | 2020-05-12 | 陕西速源节能科技有限公司 | Oil field wastewater treatment method based on environmental protection |
| CN113105063A (en) * | 2020-01-13 | 2021-07-13 | 中国石油天然气股份有限公司 | Oil extraction sewage treatment process |
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Application publication date: 20191115 |