CN104211231A - Oil field measure waste liquid treatment method - Google Patents
Oil field measure waste liquid treatment method Download PDFInfo
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- CN104211231A CN104211231A CN201310220153.2A CN201310220153A CN104211231A CN 104211231 A CN104211231 A CN 104211231A CN 201310220153 A CN201310220153 A CN 201310220153A CN 104211231 A CN104211231 A CN 104211231A
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Abstract
The invention relates to an oil field measure waste liquid treatment method. The method includes: letting wastewater enter an oil-water separator, conducting high-speed swirling to remove floating oil and part of emulsified oil therein; then making wastewater subjected to microelectrolysis oxidation enter an oxidation box, with the microelectrolysis material being Fe-based amorphous material and RE-Mg ductile cast iron waste scrap in a mass ratio of 1:15, and keeping the pH at 2-9 and the time at 15-30min; letting the wastewater enter the oxidation box, adding Ca(OH)2 to adjust the pH value at 9.0-11.0, introducing air for oxidation so as to oxidize divalent iron and remove part of pollutants at the same time; and adding a coagulant and a coagulant aid into the wastewater, carrying out solid-liquid separation in a CFM separator, taking the effluent for reinjection and using the sludge for landfill. The CFM separation is suspended membrane separation, the coagulant is activated bentonite accounting for 10% of the mass of the wastewater, and the coagulant aid is cationic polyacrylamide accounting for 3 per thousand of the mass of the wastewater. After treatment by the method, the water quality can meet the reinjection requirement, the COD removal rate reaches 82.6%, and the equipment floor space is small.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, especially a kind of oil field measure waste liquid treatment process.
Background technology
Along with the exploitation of Low permeable oil and gas reservoirs, the measure of pressure break reservoir reconstruction is generally used, containing guanidine glue, linking agent, clay stabilizer, sterilant, gel breaker, emulsifying agent etc. in fracturing fluid, waste component is complicated, intractability is very large, and the especially existence of polymer guanidine glue, makes the viscosity of waste water increase, a large amount of silt particle is suspended in water, and this also brings great difficulty for follow-up sludge dewatering.The extensive application of secondary oil recovery, tertiary oil recovery technology, also needs formation to inject a large amount of clear water while oil extraction waste water is produced in a large number simultaneously.Therefore, people wish to find one treatment process fast, can reach oil field reinjection water requirement by after measure liquid waste disposal, have both solved measure waste liquid and have arranged a difficult problem outward, again saved clear water resource.
At present, generally add biochemical method by materialization, make it to reach re-injection requirement.But the treatment time is tediously long, limit by place, also cannot meet the growing requirement in oil field, especially in remote mountain areas, huge treatment facility can not be built, remove to process sewage (the about 200m being dispersed in each well site and accumulating
3left and right).Therefore, also need one fast treatment technology and small-sized treatment system with the requirement of satisfied different occasion.
Along with the fast development of oilfield construction, carry out the requirement that oil field wastewater treatment is scientific development, especially in western China, water resources lacks relatively, more needs sewage disposal technology and equipment in special disposal oil well or station.
Summary of the invention
The object of the invention is to avoid prior art processes complicated, should not skid deficiency and a kind of oil field measure waste liquid treatment process is provided.
Oil field measure waste liquid treatment process technical scheme of the present invention is: its treatment step of oil field measure waste liquid treatment process is:
1) oily water separation: waste water enters water-and-oil separator, removes wherein oil slick and part oil in water emulsion through high-speed rotational;
2) light electrolysis: the waste water after oily water separation enters micro-electrolysis reaction tank, destroys macromolecular cpd in water by light electrolysis oxygenizement, breaks colloidal stability, then enter oxidation case;
3) be oxidized: the waste water after microelectrolysis processing enters oxidation case, adds Ca (OH)
2adjust ph, 9.0 ~ 11.0, passes into compressed air oxidation, and ferrous iron is oxidized and part pollutent is same is removed;
4) solid-liquid separation: add coagulating agent and coagulant aids after oxide treatment in waste water, enters CFM separator and carries out solid-liquid separation, and water outlet is used for re-injection, mud landfill after dehydration of generation.
Micro-electrolysis material used is Fe-based amorphous material and RE-Mg spheroidal graphite cast iron waste material bits, and the ratio of components of above bi-material is 1:15(w/w), reaction conditions pH is 2-9, and the time is 15-30min.
Described CFM is separated into the suspension film separation that flco self is formed, the cationic polyacrylamide that the acid bentonite (add sulfuric acid during acidifying and adjust pH3 ~ 4, stir 30 ~ 40min) that described coagulating agent is mass percent 10%, coagulant aids are mass percent 3 ‰.
Micro-electrolysis material of the present invention is Fe-based amorphous material and RE-Mg spheroidal graphite cast iron waste material bits.Reaction mechanism is: 1. non-crystalline material is formed under chilling condition, and Siliciumatom does not wherein have enough time to sort and is just fixed up, and when ambient conditions allows, generation is reset or displacement by Siliciumatom (comprising other atom).To reset or in displacement, its outer and time outer field electronics running orbit also changes thereupon, with waste water in participate in binding reaction, pollutent is decomposed.Move along with atom and reset, a large amount of silicon wafers becomes the negative electrode of galvanic cell, and matrix is anode, forms galvanic cell truly; 2. in RE-Mg ductile cast iron material, matrix is containing ten hundreds of graphite, and these graphite are mostly in spherical distribution.Because ductile iron material has certain toughness, a large amount of graphite can be remained in processing.In material, the quantity of graphite is more, and the quantity of galvanic cell is also more, and the energy of generation is larger, and treatment effect is more remarkable.In addition, due to the existence of rare earth element, in material crystalline process, suppress growth of graphite on the one hand, assemble at graphite edge on the other hand.So just form bimetal anode galvanic cell, the stronger (Fe of its effect
0-2e ,-0.44ev; La-3e, 2.37ev).
Described suspension film isolation technique is that the suspended substance utilizing flco to be formed carries out self filtering technique.Sewage, through previous reaction, enters tank body by bottom suspension film separating device, and under hydraulic action, the sewage entering tank body completes immediately by the transformation of colloid to flco, and under mutually colliding, flco is constantly assembled and grown up.Because device bottom water inlet area is less, relative up-flow speed, flco is floating with eddy flow, does not decline.When the water surface rises to more than mud collection bucket, current area increases, and up-flow speed is slack-off suddenly, and flco then starts to decline.Because flco surface is with electric charge, attracts each other, thus form certain thickness suspended layer (about 600mm).This suspended layer has good Adsorption Filtration Properties, is greater than 0.45 μm of solid particulate namely by filtering, so effluent quality SS≤3mg/L, after suspended layer reaches certain thickness, enters mud collection bucket immediately, then drop to mud storage chamber.
Described sludge dewatering technology: owing to containing guanidine glue or polyacrylamide macromolecular compound in waste water, the sewage sludge viscosity of generation is large, mixes with silt, does not also have a kind of method preferably to dewater at present.The present invention, except decomposing except macromolecular cpd wherein with light electrolysis, also utilizes the measures such as oxidation, flocculation, makes the mud of generation lose viscosity, ensure that the carrying out of dehydration.In order to reduce cost and not produce secondary pollution, the present invention's coagulating agent used is cheap bentonite, and not only price is low, and source is wide.The main component of mud is SiO
2, Al
2o
3with the mixture of CaO, close with mud composition, can suction pit or landfill be incorporated to, not produce secondary pollution.
Compared with prior art, advantage of the present invention is: 1. have employed Fe-based amorphous (Fe78Si9B13) and RE-Mg spheroidal graphite cast iron novel micro-electrolysis material during light electrolysis, its effect is more remarkable; Adopt CFM isolation technique when being 2. separated, separating effect is more thorough, overcomes device blocking and filtrate pollution problem simultaneously; 3. owing to adopting the series of measures such as light electrolysis, oxidation, flocculation, the mud (containing guanidine glue waste water) of generation no longer includes viscosity, solves a sludge dewatering difficult problem; 4. by optimum combination, treatment unit miniaturization is also removable, meets the multiple occasion processing requirements in oil field.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
First waste water enter oily water separation module, and the feature according to profit different densities removes wherein oil slick and part oil in water emulsion through high-speed rotational effect; Isolated oil flows out through its upper side and reclaims, waste water after oily water separation enters micro-electrolysis reaction tank, and micro-electrolysis material is Fe-based amorphous and RE-Mg spheroidal graphite cast iron waste material bits, and the mass ratio of above bi-material is 1:15, reaction conditions pH is 2-9, and the time is 15-30min; Destroy macromolecular cpd in water by light electrolysis oxygenizement, break colloidal stability; After light electrolysis oxidation, Organic substance in water is degraded, and water quality viscosity significantly reduces, and the water after microelectrolysis processing enters oxidation case, in oxidation case, add Ca (OH)
2adjust ph, 9.0 ~ 11.0, passes into compressed air oxidation, and while ferrous iron is oxidized, part pollutent is with oxidized and removal; After oxide treatment in water dosing coagulant and coagulant aids, after line-blending, enter CFM separator carry out solid-liquid separation, CFM is separated into suspension film and is separated, described coagulating agent is that the acid bentonite of wastewater quality 10% (adds sulfuric acid and adjusts pH3 ~ 4 during acidifying, stir 30 ~ 40min), coagulant aids is the cationic polyacrylamide of wastewater quality 3 ‰, water outlet can reach reinjection standard for field produces re-injection; The mud being deposited on bottom in CFM tripping device pumps into plate-and-frame filter press, can landfill through plate-and-frame filter press dewatered solids, and the water deviate from returns CFM tripping device or directly enters clean water tank.
Embodiment 1:
For the happy 3 petroleum transferring station oil field wastewater treatment of Long-dong oilfield, introduce the disposition at website, before process, water-quality COD 6887mg/L, SS are 268mg/L, petroleum-type is 154mg/L, turbidity 672, suspended solids particle diameter 13.7 μm.
Waste liquid tank waste water processes through oily water separation-light electrolysis-oxidation-CFM membrane separation process, and removing suspended substance, flco, oil and partial organic substances, water outlet is used for re-injection, and the mud of generation is through press filtration, landfill.After process, water quality meets re-injection requirement, and COD clearance reaches 82.6%, and before and after process, water quality contrast is in table 1.
Contrast before and after the happy three turns of wastewater treatments of table 1
Embodiment 2:
To the west of 26-31 and the wastewater treatment of western 38-241 well be example, introduce the disposition at well site waste water, before process, water-quality COD 8421mg/L, SS are 446mg/L, petroleum-type is 263mg/L, turbidity 544, suspended solids particle diameter 15.3 μm.
Waste liquid pool waste water processes through oily water separation-light electrolysis-oxidation-CFM membrane separation process, removing suspended substance, flco, oil and partial organic substances, the mud of generation is through press filtration, landfill, and after process, water quality meets re-injection requirement, COD clearance reaches 81.7%, and before and after process, water quality contrast is in table 2.
Contrast before and after the wastewater treatment of table 2 well site
Claims (1)
1. an oil field measure waste liquid treatment process, is characterized in that:
1) oily water separation: waste water enters water-and-oil separator, removes wherein oil slick and part oil in water emulsion through high-speed rotational;
2) light electrolysis: the waste water after oily water separation enters micro-electrolysis reaction tank, destroys macromolecular cpd in water by light electrolysis oxygenizement, breaks colloidal stability, then enter oxidation case;
Micro-electrolysis material used is Fe-based amorphous material and RE-Mg spheroidal graphite cast iron waste material bits, and the mass ratio of above bi-material is 1:15, and reaction conditions pH is 2-9, and the time is 15-30min;
3) be oxidized: the waste water after microelectrolysis processing enters oxidation case, adds Ca (OH)
2adjust ph, 9.0 ~ 11.0, passes into atmospheric oxidation, while ferrous iron is oxidized part pollutent oxidized and remove;
4) solid-liquid separation: add coagulating agent and coagulant aids after oxide treatment in waste water, enters CFM separator and carries out solid-liquid separation, and water outlet is used for re-injection, mud landfill after dehydration of generation;
Described CFM is separated into the suspension film separation that flco self is formed,
Described coagulating agent is the activated bentonite of wastewater quality 10%,
Described coagulant aids is the cationic polyacrylamide of wastewater quality 3 ‰.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310220153.2A CN104211231A (en) | 2013-06-05 | 2013-06-05 | Oil field measure waste liquid treatment method |
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| CN201310220153.2A CN104211231A (en) | 2013-06-05 | 2013-06-05 | Oil field measure waste liquid treatment method |
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| CN104211231A true CN104211231A (en) | 2014-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759154A (en) * | 2015-03-18 | 2015-07-08 | 蚌埠德美过滤技术有限公司 | Composite filter material prepared by blending melt-blown polypropylene with modified organic bentonite and used for sewage treatment and preparation method thereof |
| CN106542624A (en) * | 2016-10-28 | 2017-03-29 | 中国石油天然气股份有限公司 | A kind of oil field measure waste liquid inorganic agent and its using method |
| CN114620870A (en) * | 2022-04-07 | 2022-06-14 | 中石化石油工程技术服务有限公司 | Oil field operation waste liquid treatment system and method |
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| CN101704565A (en) * | 2009-11-16 | 2010-05-12 | 同济大学 | Preparation method of iron-carbon micro-electrolytic filler |
| CN102557198A (en) * | 2012-01-15 | 2012-07-11 | 安徽中环环保科技有限公司 | Multi-dimensional electrocatalysis reactor |
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2013
- 2013-06-05 CN CN201310220153.2A patent/CN104211231A/en active Pending
Patent Citations (5)
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| CN1367146A (en) * | 2002-03-07 | 2002-09-04 | 吴振庭 | Method for controlling oil-bearing waste water |
| CN1789155A (en) * | 2004-12-15 | 2006-06-21 | 中国科学院生态环境研究中心 | Rotary drum type reaction apparatus for waste water treatment by micro-electrolysis |
| CN101704565A (en) * | 2009-11-16 | 2010-05-12 | 同济大学 | Preparation method of iron-carbon micro-electrolytic filler |
| CN102557198A (en) * | 2012-01-15 | 2012-07-11 | 安徽中环环保科技有限公司 | Multi-dimensional electrocatalysis reactor |
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| 冯永训主编: "《油田采出水处理设计手册》", 30 September 2005, 中国石化出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759154A (en) * | 2015-03-18 | 2015-07-08 | 蚌埠德美过滤技术有限公司 | Composite filter material prepared by blending melt-blown polypropylene with modified organic bentonite and used for sewage treatment and preparation method thereof |
| CN106542624A (en) * | 2016-10-28 | 2017-03-29 | 中国石油天然气股份有限公司 | A kind of oil field measure waste liquid inorganic agent and its using method |
| CN114620870A (en) * | 2022-04-07 | 2022-06-14 | 中石化石油工程技术服务有限公司 | Oil field operation waste liquid treatment system and method |
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Application publication date: 20141217 |
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