CN102040311B - Oil field polymer flooding produced water treatment method - Google Patents
Oil field polymer flooding produced water treatment method Download PDFInfo
- Publication number
- CN102040311B CN102040311B CN2009102361501A CN200910236150A CN102040311B CN 102040311 B CN102040311 B CN 102040311B CN 2009102361501 A CN2009102361501 A CN 2009102361501A CN 200910236150 A CN200910236150 A CN 200910236150A CN 102040311 B CN102040311 B CN 102040311B
- Authority
- CN
- China
- Prior art keywords
- sewage
- oil
- water
- oil field
- polymer
- Prior art date
- 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.)
- Active
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an oil field polymer flooding produced water treatment method. The oil field polymer flooding produced water treatment method comprises the following steps of: a, removing floating oil and dispersed oil; b, removing emulsified oil and suspended matters; c, separating the suspended matters and solid particulate impurities; d, reducing viscosity of sewage; e, degrading polymer and petroleum in the sewage by using microorganisms which are from the nature, wherein a bacillus strain separated from a water sample of oil field sewage is used for degrading the polymer in sewage and a bacillus strain separated from a soil sample of oil field soil is used for degrading petroleum in the sewage; f, removing bacteria, viruses and suspended matters from the sewage; and g, removing inorganic ions from the sewage. The oil field polymer flooding produced water treatment method has the advantages of achieving a good treatment effect and particularly effectively degrading the polymer in the sewage, so that the treated water can meet the requirements on water used for preparing polymer solution.
Description
Technical field
The present invention relates to the oilfield polymer flooding oil-extraction wastewater treatment technology, belong to oil-containing, contain and gather the disposing polluted water in oil field.
Background technology
SEPIGEL 305 (PAM) be methacrylamide homopolymer or with other monomer copolymerization the general designation of polymkeric substance, be one of most widely used kind in the water-soluble polymer.In TOR, adopt polymer flooding can improve oil recovery factor.Contain a large amount of SEPIGEL 305s in the polymer flooding water, such sewage is when adopting conventional Sewage treatment systems to handle, and the subject matter of appearance is following:
(1) chemical flocculation difficulty adopts original flocculation agent, surplus promptly usage quantity increases by ten times, still is difficult to abundant flocculation;
(2) slurry tank top scum silica frost is built up seriously, and device space utilization ratio reduces significantly, and the effect of settling extreme difference has increased the weight of the filtering system burden;
(3) filter leaching material hardens seriously, the backwash difficulty, and it is seriously uneven to cross water, and the filtrate replacement cycle is only about two months.
Discover the reason following points that cause above phenomenon:
(1) contains polymkeric substance in the recovered water, the viscosity of oily(waste)water is multiplied (increasing more than 2～4 times usually).The viscosity of water drive recovered water is generally 0.6mPas in the time of 45 ℃, and the viscosity of polymer flooding water increases with the increase of polymer content, is generally 1～3mPas; The increase of viscosity can increase water-borne glue body particulate stability, and the existence of polymkeric substance simultaneously also makes oil-water emulsion degree and intensity improve, and oily water separation speed slows down, and the result is that polymer-bearing waste-water is handled required static balance time growth.
(2) oil droplet of recovered water diminishes.Oil bead diameter is more than 90% less than the oil droplet quantity of 10 μ m in the polymer produced water of particle diameter test discovery, and the oil bead diameter intermediate value is 3～5 μ m.The microcosmic test result shows that polymkeric substance increases water-oil interface moisture film intensity, and interfacial charge strengthens, and causes the medium and small oil droplet of recovered water stably to be present in the milk sap water body of O/W.Thereby increased intractability, make in the sewage after the processing oil-contg higher.
(3) owing to the existence of anionic polymer, seriously disturbed the result of use of flocculation agent, make the throwing out variation, increased the consumption of medicament greatly.Simultaneously, the water quality after the processing does not reach original water quality standard, oil-contg and suspended solids content severe overweight.Sewage contain gather after, the general effect variation of oily water treatment.
(4) because the polymkeric substance adsorptivity is stronger, the quantity of sand and mud that carries is bigger, has shortened backwashing period greatly, has increased the workload of back flushing.Because quantity of sand and mud increases, requiring to handle each process procedure spoil disposal facility must be proper, need increase the sludge treatment link in case of necessity simultaneously.By inquiry, the investigator finds to adopt early stage and later stage institute's exposed problems basically identical of enforcement at polymer flooding three, and just with the increase of polymer content, problem is outstanding more, sharp-pointed.
Chinese invention patent 02121095.0 (publication number CN 1381410A) discloses a kind of polymer-bearing waste-water advanced treatment and reuse technology; Solved the high problem of polymer-bearing waste-water salinity; It is characterized in that: carry out dosing according to following steps: in the sewage equalizing tank that polymer-bearing waste-water gets into, add sterilant; Absorption: the mass percent that dams is 20%～30% suspended substance and bacterium; The one-level membrane filtration: it is suspended substance and the bacterium more than 99% and to filter out mass percent be 80% Ca that the degree of depth is removed mass percent
2+, Mg
2+Ion, water rate mass percent are 90%～95%, and mass percent is that 5%～10% liquid concentrator returns and continues to filter; Secondary membrane filtration: filter out mass percent and be 90% Ca
2+, Mg
2+, K
+, Na
+Ion, water outlet yield mass percent is 80%～85%, mass percent is that 15%～20% liquid concentrator returns and continues to filter, until going out water salinity below 1000mg/L; Reuse: get into the clear water tank stores through the water outlet behind the secondary membrane filtration, the total recovery mass percent is 72%～81%, squeezes into polymkeric substance injection allocation station and carries out prepared polymer solution.
Chinese invention patent 03123565.4 discloses a kind of oilfield polymer flooding extraction sink drainage treatment process; Mainly solved the problem that existing oilfield polymer flooding extraction sewage treatment process processing efficiency is low, investment is big; It is characterized in that: the oily(waste)water that the mouth of a river is come at oil station gets into strainer, outer defeated jar successively through oil eliminator, and output pump will fail the water of jar outward and import water-injection plant; The purifying waste water lifting that backwashing pump will be failed outward in the jar gets into strainer successively, input concentration tank before the strainer back flushing draining, input recovery pond after the back flushing draining; The settlement separate mud that goes out in oil eliminator bottom is entered the mud concentration tank, and mud is through after concentrating, and the supernatant of mud concentration tank enters and reclaims the pond; The sewage lifting entering oil eliminator that the recovery pump will reclaim in the pond is handled again; Sump pump will pump into the oil station from the sump oil that oil eliminator is gone into the slop oil tank.
Though more than two patents all relate to polymer flooding extraction WWT, the method for polymer degradation all is not provided.And experiment is found, if polymkeric substance is not carried out visbreaking and degraded, Sewage treatment systems is difficult to run well.
Summary of the invention
The objective of the invention is to solve the problems of the prior art, a kind of treatment process of polymer flooding water of oil field is provided, dispose of sewage with this method, can carry out visbreaking and degraded to polymkeric substance, water outlet can reach joins the requirement that gathers water.
Technical scheme of the present invention is: a kind of polymer flooding water of oil field treatment process is characterized in that may further comprise the steps:
A, remove oil slick and dispersed oil in the decontaminated water;
B, remove oil in water emulsion and suspended substance in the decontaminated water;
Suspended substance and solid particle polluter in c, the separation sewage;
The viscosity of d, reduction sewage is below 0.4mPas;
Polymkeric substance and oil in e, the microbiological deterioration sewage, described microbial strains obtain through artificial screening and domestication from the Nature, and wherein the artificial screening of the mikrobe of polymkeric substance is following with the domestication step in the degradation of sewage:
Get the sewage water sample 250mL that the oil field contains polymkeric substance, the polymkeric substance that the oil field displacement of reservoir oil of interpolation 1000mg/L is used, shaking table are cultivated and domestication; Tame after 3 months, carry out bacterial classification purifying, separation, isolate 1 bacillus and belong to bacterial strain (bacillus sp.); This bacterial strain is preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center; Preserving number: CGMCC No.3345, October 19 2009 preservation day, the polymkeric substance in the strain degradation sewage;
The artificial screening of the mikrobe of degradation of sewage PetroChina Company Limited. is following with the domestication step:
Get oil field oil-containing sandy soil soil sample, get 1g and pour in the Erlenmeyer flask that 500mg/L oil and 100mL zero(ppm) water are housed, shaking table is cultivated and domestication; Tame after 1 month, carry out bacterial classification purifying, separation, isolate 1 bacillus and belong to bacterial strain (bacillus sp.); This bacterial strain is preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center; Preserving number: CGMCC No.3344, October 19 2009 preservation day, the oil in the strain degradation sewage;
F, ultrafiltration membrance filter remove bacterium, virus and suspended substance in the decontaminated water;
G, reverse osmosis membrane filtration filter mineral ion.
Said step a is: in sewage, adding mass percent is 0.3%～3% emulsion splitter.
Said step b is: the coagulating agent that in sewage, adds 50mg/L～150mg/L flocculation agent and 50mg/L～200mg/L.
Said step c is: the molten gas of 0.4～0.6MPa is discharged in the flotation cell; Dissolve the gas instant decompression to normal pressure; Along with the reduction of pressure, be dissolved in gas in the sewage and be drawn out of to separate out and form microbubble and upwards float, in floating process, constantly adsorb the suspended particle in the sewage; And take them to the water surface, cast aside then.
Said steps d is: be electrode with iron, adopt the sacrificial electrode method, add voltage of alternating current and make anodizing and discharge metals ion, the outside simultaneously O that provides
2Capture the electronics that external electric field provides, form oxyradical ion O
2-, the oxyradical ion induces H
2O
2The back generates hydroxyl radical free radical ion OH; Hydroxyl radical free radical ion OH has high oxidisability, can the molecular chain of polymkeric substance be interrupted, and becomes numerous small molecules after the high polymer chain rupture; The sewage viscosity that contains polymkeric substance is reduced greatly, and viscosity drops to below the 0.4mPas.
The bacterial classification kind liquid of the bacterial classification kind liquid of the degradation polymer among the said step e and degraded oil mixed by 1: 1, was added in the sewage degradation treatment of it being carried out polymkeric substance and oil.
Said step f does, adopts tubular ultra-filtration membrane, and its diameter is 8mm, and membrane pore size is 30nm, and flow rate of water flow is 4.1m/s.
The invention has the beneficial effects as follows: treatment effect is good, the polymkeric substance in the sewage of particularly having degraded effectively, and the water after the processing can satisfy the requirement of prepared polymer solution water.
Embodiment
A kind of polymer flooding water of oil field treatment process of the present invention may further comprise the steps:
A, remove oil slick and dispersed oil in the decontaminated water.Gather oily(waste)water and carry out oil removal and handle containing; Concrete operation method is: in sewage, adding mass percent is 0.3%～3% emulsion splitter; Emulsion splitter can be ZC-3086 or TP series special efficacy emulsion splitter or XD-80 series petroleum demulsifier etc.; Stir, remove oil slick and dispersed oil in the decontaminated water;
B, remove oil in water emulsion and suspended substance in the decontaminated water.The coagulating agent that in sewage, adds 50mg/L～150mg/L flocculation agent and 50mg/L～200mg/L, flocculation agent can be JO-1 inorganic flocculating agent or ZX-I organic floculant etc.; Coagulating agent can be CAX coagulating agent or Poly aluminum Chloride (PAC) (PAC) coagulating agent etc.;
Suspended substance and solid particle polluter in c, the separation sewage.Handle through air-dissolving air-float: the molten gas of 0.4～0.6MPa is discharged in the flotation cell; Dissolve the gas instant decompression to normal pressure,, be dissolved in gas in the sewage and be drawn out of to separate out and form microbubble and upwards float along with the reduction of pressure; In floating process, constantly adsorb the suspended particle in the sewage; And take them to the water surface, and cast aside then, reach the purpose of separating suspended substance in the sewage and solid particle polluter;
The viscosity of d, reduction sewage is below 0.4mPas.Adopt the catalytic oxidation method: with iron is electrode, adopts expendable electrode method, adds voltage of alternating current and makes anodizing and discharge metals ion, the outside simultaneously O that provides
2Capture the electronics that external electric field provides, form oxyradical ion O
2-, the oxyradical ion induces H
2O
2The back generates hydroxyl radical free radical ion OH; Hydroxyl radical free radical ion OH has high oxidisability; Can the molecular chain of polymkeric substance be interrupted, become numerous small molecules after the high polymer chain rupture, the sewage viscosity that contains polymkeric substance is reduced greatly; Viscosity drops to below the 0.4mPas, and drainage flow property improves;
Polymkeric substance and oil in e, the microbiological deterioration sewage, described microbial strains obtain through artificial screening and domestication from the Nature:
(1) artificial screening of the mikrobe of polymkeric substance is following with the domestication step in the degradation of sewage:
Get the sewage water sample 250mL that the oil field contains polymkeric substance, the polymkeric substance that the oil field displacement of reservoir oil of interpolation 1000mg/L is used, shaking table are cultivated and domestication; Tame after 3 months; Carry out bacterial classification purifying, separation, isolate 1 bacillus and belong to (Bacillus) bacterial strain, the polymkeric substance in the strain degradation sewage;
The artificial screening of the mikrobe of degradation of sewage PetroChina Company Limited. is following with the domestication step:
Get oil field oil-containing sandy soil soil sample, get 1g and pour in the Erlenmeyer flask that 500mg/L oil and 100mL zero(ppm) water are housed, shaking table is cultivated and domestication; Tame after 1 month; Carry out bacterial classification purifying, separation, isolate 1 bacillus and belong to bacterial strain, the oil in the strain degradation sewage;
Each oil field oil-containing sandy soil soil sample is formed may be slightly different, but carry out bacterial classification purifying, separation through aforesaid method, generally can obtain polymkeric substance and the bacterial classification of oil in the degradation of sewage.
The bacterial classification kind liquid of the bacterial classification kind liquid of degradation polymer in the above-mentioned degradation of sewage and degraded oil was mixed by 1: 1, be added in the sewage degradation treatment of it being carried out polymkeric substance and oil;
F, ultrafiltration membrance filter: adopt tubular ultra-filtration membrane, its diameter is 8mm, and membrane pore size is 30nm, and flow rate of water flow is 4.1m/s, and behind ultrafiltration membrance filter, the bacterium in the sewage, virus and suspended substance are removed;
G, reverse osmosis membrane filtration: the Ca in the water
2+, Mg
2+, Fe
3+, K
+, Na
+Filtered Deng mineral ion, reduced the salinity of sewage, thereby reached the requirement of prepared polymer solution water.
Use this art breading oilfield sewage station oil-containing, contain and gather waste water, experimental size is 5m
3/ h.Wherein:
Remove oil slick and dispersed oil in the decontaminated water: in sewage, adding mass percent is 1.5% emulsion splitter ZC-3086;
Remove oil in water emulsion and suspended substance in the decontaminated water: in sewage, add 100mg/L JO-1 inorganic flocculating agent, add 150mg/L CAX coagulating agent;
Separate suspended substance and solid particle polluter in the sewage: the molten gas of 0.5MPa is discharged in the flotation cell;
In 3 weeks of continuous operation, raw water quality that monitors and effluent quality contrast like following table:
Table 1
| Sequence number | Lab work | Raw water quality | Effluent quality | Join the polywater standard |
| 1 | Petroleum-type mg/L | 300～500 | ≤1 | ＜50 |
| 2 | Polymkeric substance mg/L | 100～500 | ≤1 | Do not require |
| 3 | Suspended substance mg/L | 100～200 | ≤1 | ＜10 |
| 4 | COD mg/L | 800～1200 | ≤60 | ＜500 |
| 5 | Ferrous ion content mg/L | 10～20 | 0 | 0 |
| 6 | Sulfidion content mg/L | 20 | 0 | 0 |
| 7 | Sulfate reduction bacterial content/mL | 10000 | 0 | 0 |
| 8 | Salinity mg/L | 11000 | ≤300 | ＜1000 |
| 9 | Calcium, mg ion sum mg/L | 1500 | ≤60 | ＜100 |
Experiment finds that polymkeric substance mainly is to degrade through catalytic oxidation and biochemical step; Drop to≤5mg/L by 100～500mg/L, make bio-chemical effluent water quality reach the into condition of film, moved for 3 weeks after; The stifled film phenomenon of pollutent does not all take place in ultra-filtration membrane and reverse osmosis membrane, does not carry out the film flushing yet.
By can finding out in the table 1, to handle to contain with the inventive method and gather oily(waste)water, the petroleum-type in the sewage drops to below the 1mg/L, and suspended substance drops to below the 1mg/L, and salinity drops to below the 300mg/L, satisfies prepared polymer solution water water quality requirement fully.
Claims (8)
1. a mikrobe is characterized in that it is Bacillus strain (Bacillus sp.), and this bacterial strain is preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center, preserving number: CGMCC No.3345.
2. polymer flooding water of oil field treatment process is characterized in that may further comprise the steps:
A, remove oil slick and dispersed oil in the decontaminated water;
B, remove oil in water emulsion and suspended substance in the decontaminated water;
Suspended substance and solid particle polluter in c, the separation sewage;
The viscosity of d, reduction sewage is below 0.4mPas;
Polymkeric substance and oil in e, the microbiological deterioration sewage, wherein the mikrobe of the polymkeric substance in the degradation of sewage is the described mikrobe of claim 1; The mikrobe of the oil in the degradation of sewage is a kind of Bacillus strain (Bacillus sp.), and this bacterial strain is preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center, preserving number: CGMCC No.3344;
F, ultrafiltration membrance filter remove bacterium, virus and suspended substance in the decontaminated water;
G, reverse osmosis membrane filtration filter mineral ion.
3. polymer flooding water of oil field treatment process according to claim 2 is characterized in that: said step a is: in sewage, adding massfraction is 0.3%～3% emulsion splitter.
4. polymer flooding water of oil field treatment process according to claim 2 is characterized in that: said step b is: the coagulating agent that in sewage, adds 50mg/L～150mg/L flocculation agent and 50mg/L～200mg/L.
5. polymer flooding water of oil field treatment process according to claim 2; It is characterized in that: said step c is: the molten gas of 0.4～0.6MPa is discharged in the flotation cell, dissolves the gas instant decompression to normal pressure, along with the reduction of pressure; Being dissolved in gas in the sewage is drawn out of to separate out and forms microbubble and upwards float; In floating process, constantly adsorb the suspended particle in the sewage, and take them to the water surface, cast aside then.
6. polymer flooding water of oil field treatment process according to claim 2 is characterized in that: said steps d is: be electrode with iron, adopt expendable electrode method, add voltage of alternating current and make anodizing and discharge metals ion, the outside simultaneously O that provides
2Capture the electronics that external electric field provides, form oxyradical ion O
2-, the oxyradical ion induces H
2O
2The back generates hydroxyl radical free radical ion OH; Hydroxyl radical free radical ion OH has high oxidisability, can the molecular chain of polymkeric substance be interrupted, and becomes numerous small molecules after the high polymer chain rupture; The sewage viscosity that contains polymkeric substance is reduced greatly, and viscosity drops to below the 0.4mPas.
7. polymer flooding water of oil field treatment process according to claim 2; It is characterized in that: the bacterial classification kind liquid of the bacterial classification kind liquid of the degradation polymer among the said step e and degraded oil mixed by 1: 1, was added in the sewage degradation treatment of it being carried out polymkeric substance and oil.
8. polymer flooding water of oil field treatment process according to claim 2 is characterized in that: said step f does, adopts tubular ultra-filtration membrane, and its diameter is 8mm, and membrane pore size is 30nm, and flow rate of water flow is 4.1m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102361501A CN102040311B (en) | 2009-10-20 | 2009-10-20 | Oil field polymer flooding produced water treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102361501A CN102040311B (en) | 2009-10-20 | 2009-10-20 | Oil field polymer flooding produced water treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102040311A CN102040311A (en) | 2011-05-04 |
| CN102040311B true CN102040311B (en) | 2012-08-22 |
Family
ID=43906901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102361501A Active CN102040311B (en) | 2009-10-20 | 2009-10-20 | Oil field polymer flooding produced water treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102040311B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104724849A (en) * | 2013-12-19 | 2015-06-24 | 中国科学院沈阳应用生态研究所 | Method for removal of polyacrylamide and hydrolysis product thereof from polymer flooding well washing water |
| CN106565029B (en) * | 2015-10-12 | 2021-11-16 | 中国石油化工股份有限公司 | Treatment device and method for fracturing flow-back fluid |
| CN105727599B (en) * | 2016-02-23 | 2017-11-07 | 同济大学 | The method that demulsifying bacteria is used to strengthen emulsion breakdown is modified using magnetic nano-particle |
| CN106746112B (en) * | 2016-12-09 | 2020-05-05 | 创智汇晶知识产权运营(苏州)有限公司吴中经济开发区分公司 | Treatment method of oily wastewater |
| CN106587541A (en) * | 2017-01-11 | 2017-04-26 | 江苏八达科技股份有限公司 | Method for efficiently treating oilfield wastewater |
| CN109133487A (en) * | 2017-06-16 | 2019-01-04 | 江苏立业环境科技有限公司 | A kind of petrochemical wastewater treatment process |
| CN108409025A (en) * | 2017-11-13 | 2018-08-17 | 南开大学 | A kind of ternary composite driving oil field recovered water materialization-biochemistry combined treatment process |
-
2009
- 2009-10-20 CN CN2009102361501A patent/CN102040311B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102040311A (en) | 2011-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102040311B (en) | Oil field polymer flooding produced water treatment method | |
| CN101851046B (en) | Device for deep treatment and complete recovery of coking wastewater and application method thereof | |
| CN102452760B (en) | Treatment method for recycle of oil field produced water | |
| CN103992013B (en) | Method and equipment for treating high-concentration refractory chemical wastewater | |
| CN201817357U (en) | Full-reuse treatment device for coking wastewater through Fenton oxidation and double-membrane process | |
| CN101337752B (en) | Advanced treatment process for paper-making waste water | |
| CN205740628U (en) | A kind of Novel water-purifying system | |
| CN102503005B (en) | Method for replacing bottom sludge of polluted water in site and sludge cleaning equipment | |
| CN101993177B (en) | Method for treating polymer-containing sewage of oil field | |
| CN210528679U (en) | Mine water resourceful treatment recycling system | |
| CN102531291A (en) | Standard discharge treatment system for rock debris wastewater | |
| CN104803555A (en) | Mobile skid-mounted equipment for efficient water treatment | |
| CN1209304C (en) | Garbage percolation liquid treatment process | |
| CN102329051B (en) | Rubbish percolate treatment device by taking advanced oxidation and comprehensive membrane treatment as cores | |
| CN204281479U (en) | A kind for the treatment of system of coating wastewater | |
| CN105923830B (en) | A kind of preprocess method of coal chemical industrial waste water two-stage enhanced coagulation oil removing | |
| CN102329021B (en) | High-eutrophication water advanced purification treatment method and device | |
| CN201901623U (en) | Device for advanced treatment and complete recycle of coking waste water | |
| CN108947137A (en) | A kind of kitchen garbage percolation liquid treatment method | |
| CN102040310B (en) | Sewage treatment method for reinjection of produced water from oil field to low-permeability oil field | |
| CN205382030U (en) | Mine effluent disposal system | |
| CN107365008A (en) | A kind of vehicular pressure break returns waste discharge and abandons liquid treating system | |
| CN113233660A (en) | Treatment method of salt-containing organic wastewater in oilfield sewage | |
| CN206437971U (en) | A kind of environment-friendly high-efficiency pickling waste waters processing system | |
| CN105174662B (en) | The treating method and apparatus of oil field difficult degradation oil extraction-generated waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |