CN102107998A - Method for treating low-permeability oilfield reinjection water - Google Patents
Method for treating low-permeability oilfield reinjection water Download PDFInfo
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- CN102107998A CN102107998A CN 201110007653 CN201110007653A CN102107998A CN 102107998 A CN102107998 A CN 102107998A CN 201110007653 CN201110007653 CN 201110007653 CN 201110007653 A CN201110007653 A CN 201110007653A CN 102107998 A CN102107998 A CN 102107998A
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Abstract
The invention relates to a method for treating low-permeability oilfield reinjection water, which comprises steps as follows: (1) oil extraction sewage enters an oil separator, floating oil and sediment are removed by inclined-plate oil removal, and the hydraulic power stays for 3 hours; (2) effluent water of the oil separator is condensed in a floatation tank under de-electrifying condition, thereby removing polymers and emulsified oil; (3) the water quantity and water quality of the sewage are conditioned in a conditioning tank to prevent rapid changes of the activated sludge load when the water quality of the sewage greatly fluctuates, and the hydraulic power stays for 10 hours; and (4) a membrane module of a membrane bioreactor is additionally arranged in an aerobic tank, so that all the activated sludge is entrapped in the reactor. The invention has the following advantages: good quality of effluent water, which can meet the water-quality index (A1 standard) for low-permeability oilfield reinjection water; and high resistance to pollution: the sewage is pretreated by oil separation and electrocoagulation floatation before being treated by the MBR (membrane bioreactor), so as to remove most oil and other pollutants which can greatly damage the membrane element, thereby well protecting the membrane element and ensuring that the membrane equipment can stably operate for a long time.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, specifically a kind of low permeability oil field re-injection water treatment method.
Background technology
The common oleaginousness of oilfield produced water is higher, BOD
5/ COD belongs to difficult for biological degradation sewage 0.12～0.125, generally contains sulphate reducing bacteria (SRB), saprophytic microorganism (TGB) and iron bacteria etc., easily causes bacterium to grow in a large number; The supersalinity of oil extraction-generated waste water or chemical corrosion and the fouling that high salinity easily causes line equipment simultaneously.
At present for low permeability oil field, sewage reached the particularly water quality requirement of ultra-low penetration oil reservoir re-injection water of low permeability pay after domestic each oilfield produced water treatment station also was difficult to stably make and handles, most of low permeability oil field re-injection water treatment process generally is to add technology of fine filtering after processed conventionally secondary or tertiary treatment, and each low permeability oil field is that the treatment scheme of re-injection water mainly contains following two kinds with the oil extraction-generated waste water:
Wherein fine filtering is a gordian technique, and technology such as the preconditioning technique of front such as sedimentation oil removing, air supporting, conventional filtration are the guarantees that fine filtering is given full play to its function.For the treatment system of oil extraction-generated waste water, if pre-treatment does not reach requirement, fine filter and film filter will be difficult to bring into play its due effect, even the example of fine filter even conventional filtration device paralysis occur causing because of pretreating effect is bad.Because China's low-permeability oil deposit reserves account for 60%～70%, be the main basis of producing in the increasing the storage in the suitable from now on period, and the main mode of development of low-permeability oil reservoir technology is water filling, therefore the research to low permeability pay re-injection water treatment seems particularly important.Also there are not effective ways at present.
Summary of the invention
The object of the invention is exactly the defective at prior art, provides a kind of low permeability oil field re-injection water treatment method, to remedy the deficiencies in the prior art.
Technical scheme of the present invention may further comprise the steps:
(1), oil extraction-generated waste water enters oil trap, adopts the swash plate oil removing to remove floating oil and sediment, hydraulic detention time 3 hours;
(2), the oil trap water outlet removes the electrocoagulation air flotation pool, the electrocoagulation air flotation pool contains electrocoagulation and two parts of electrofloatation; The electrocoagulation district adopts the aluminium sheet electrode of some amount, is placed on position on the lower side in the pond at a certain angle; Electrolytic gas floating region anode adopts Graphite Electrodes, and negative electrode adopts the stainless steel metal electrode, is placed in parallel in bottom, electrolytic gas floating region.Utilize the characteristics of the high salt of oil extraction-generated waste water, can effectively cut down the consumption of energy; The electricity throwing out can effectively be removed polymkeric substance and oil in water emulsion; The microbubble that electrolysis produces is dispersed oil, the dissolving oil in the flotation oil extraction waste water effectively.
(3), in equalizing tank to the water yield of sewage and water quality is carried out all and, activated sludge loading takes place when big fluctuation occurring and sharply changes hydraulic detention time 10 hours in the water quality that prevents sewage;
(4), in Aerobic Pond the membrane module of buildup film bio-reactor, all be trapped in whole active sludge in the reactor; Membrane module adopts single-ended fixedly bunching type membrane module, it comprises header, be communicated with web member on the header, vertically be inserted with aeration spray head and hollow-fibre membrane silk in the web member, the bottom of web member is communicated with aeration tube, one end of hollow-fibre membrane silk is bonded on the web member, and the film silk the other end is a free end, leaves passage between the hollow-fibre membrane silk.Membrane bioreactor of the present invention (MBR) treatment process is on the basis of former A/O internal recycle biological denitrification process, adopt external tubular type MBR membrane module, because the efficient crown_interception of membrane module, all be trapped in whole active sludge in the reactor, make the sludge concentration in the reactor can reach higher level, can reach 20～30g/L usually.Like this, just greatly reduce the sludge loading in the bio-reactor, improved the MBR system organic removal efficient; Simultaneously because the centrifugation of membrane module, make that hydraulic detention time (HRT) and sludge retention time (SRT) in the bio-reactor are distinct, the microorganism (as nitrobacteria) of length also can survive in reactor so just can to make poor growth, generation time, guarantee the MBR system except that having the organic effect of efficient degradation, also had good nitrification.
It is good that the present invention produces water water quality, and suspended substance, bacterium, median particle size etc. can well satisfy low permeability oil field re-injection water water-quality guideline (A1 standard); Antifouling property is good, does pre-treatment with oil removal and electrocoagulation air supporting before the MBR, has removed most of wet goods to the bigger pollutent of membrane element injury, and membrane element has been played the better protecting effect, guarantees that film device can long-time steady operation.
The present invention adopt the electrocoagulation air flotation technology have pollution-free, can react at normal temperatures and pressures, and need not to add advantages such as other chemical, floor space are little, flexible operation; MBR system volume load is high, and excess sludge production is few, can reduce the investment aspect the excess sludge processing; The total system floor space is little, the flow process compactness, and modular construction makes things convenient for operational management etc.Adopt electrocoagulation air supporting and external tubular membrane bio-reactor (MBR) technology in the oil extraction-generated waste water re-injection process field of low permeability oil field, have that treatment effect is good, flow process is simple, easy to operate, floor space is little, reduced investment, low power consumption and other advantages.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Fig. 2 is the structural representation of the single-ended fixedly bunching type of the present invention membrane module
Fig. 3 is the structural representation of hollow-fibre membrane silk of the present invention
Fig. 4 is that the A-A of Fig. 3 is to view
Embodiment
Below in conjunction with accompanying drawing the present invention is described further:
As shown in Figure 1, the present invention includes following steps:
Technical scheme of the present invention may further comprise the steps:
(1), oil extraction-generated waste water enters oil trap, adopts the swash plate oil removing to remove floating oil and sediment, hydraulic detention time 3 hours;
(2), the oil trap water outlet removes the electrocoagulation air flotation pool, the electrocoagulation air flotation pool contains electrocoagulation and two parts of electrofloatation; The electrocoagulation district adopts the aluminium sheet electrode of some amount, is placed on position on the lower side in the pond at a certain angle; Electrolytic gas floating region anode adopts Graphite Electrodes, and negative electrode adopts the stainless steel metal electrode, is placed in parallel in bottom, electrolytic gas floating region.Utilize the characteristics of the high salt of oil extraction-generated waste water, can effectively cut down the consumption of energy; The electricity throwing out can effectively be removed polymkeric substance and oil in water emulsion; The microbubble that electrolysis produces is dispersed oil, the dissolving oil in the flotation oil extraction waste water effectively.
(3), in equalizing tank to the water yield of sewage and water quality is carried out all and, activated sludge loading takes place when big fluctuation occurring and sharply changes hydraulic detention time 10 hours in the water quality that prevents sewage;
(4), in Aerobic Pond the membrane module of buildup film bio-reactor, all be trapped in whole active sludge in the reactor; As Fig. 2, Fig. 3 and shown in Figure 4, membrane module adopts single-ended fixedly bunching type membrane module, it comprises header 5, be communicated with web member 4 on the header 5, vertically be inserted with aeration spray head 3 and hollow-fibre membrane silk 1 in the web member 4, the bottom of web member is communicated with aeration tube 2, and an end of hollow-fibre membrane silk 1 is bonded on the web member 4, the film silk the other end is a free end, leaves passage between the hollow-fibre membrane silk.Membrane bioreactor of the present invention (MBR) treatment process is on the basis of former A/O internal recycle biological denitrification process, adopt external tubular type MBR membrane module, because the efficient crown_interception of membrane module, all be trapped in whole active sludge in the reactor, make the sludge concentration in the reactor can reach higher level, can reach 20～30g/L usually.Like this, just greatly reduce the sludge loading in the bio-reactor, improved the MBR system organic removal efficient; Simultaneously because the centrifugation of membrane module, make that hydraulic detention time (HRT) and sludge retention time (SRT) in the bio-reactor are distinct, the microorganism (as nitrobacteria) of length also can survive in reactor so just can to make poor growth, generation time, guarantee the MBR system except that having the organic effect of efficient degradation, also had good nitrification.
Claims (2)
1. low permeability oil field re-injection water treatment method may further comprise the steps:
(1), the employing swash plate is removed oil and the sediment in the waste water, hydraulic detention time 3 hours in oil trap;
(2), the sewage after oil removal enters air flotation pool, by adding brokenly floating agent, coagulating agent, removes dispersed oil and suspended substance, and removes portion C OD;
(3), in equalizing tank to the water yield of sewage and water quality is carried out all and, the biological sludge that the water quality that prevents sewage takes place when big fluctuation occurring is poisoned hydraulic detention time 10 hours;
(4), in the micro-electrolysis reaction pond, load cast iron filing and gac, be respectively the anode and the negative electrode of micro-electrolysis reaction.Iron filings, activated carbon grain and serve as electrolytical waste water and form countless galvanic cells, produce the character that electrode reaction changes pollutent in the sewage, remove nitric nitrogen and reach more than 70%, degraded COD, reduce organic content and improve the biodegradability of sewage, thereby reach the purpose of handling waste water;
(5), in Aerobic Pond the membrane module of buildup film bio-reactor, all be trapped in whole active sludge in the reactor; Membrane module adopts single-ended fixedly bunching type membrane module, it comprises header, be communicated with web member on the header, vertically be inserted with aeration spray head and hollow-fibre membrane silk in the web member, the bottom of web member is communicated with aeration tube, one end of hollow-fibre membrane silk is bonded on the web member, and the film silk the other end is a free end, leaves passage between the hollow-fibre membrane silk.
2. the method for the metallurgical coking chemical waste water of little electrolysis according to claim 1-Membrane Bioreactor for Wastewater Treatment, it is characterized in that: described membrane module adopts single-ended fixedly bunching type membrane module, it comprises header, be communicated with web member on the header, vertically be inserted with aeration spray head and hollow-fibre membrane silk in the web member, the bottom of web member is communicated with aeration tube, and an end of hollow-fibre membrane silk is bonded on the web member, the film silk the other end is a free end, leaves passage between the hollow-fibre membrane silk.
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| CN 201110007653 CN102107998A (en) | 2011-01-14 | 2011-01-14 | Method for treating low-permeability oilfield reinjection water |
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| CN 201110007653 CN102107998A (en) | 2011-01-14 | 2011-01-14 | Method for treating low-permeability oilfield reinjection water |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214147A (en) * | 2013-04-16 | 2013-07-24 | 北京航空航天大学 | Oil-refining wastewater treatment method and device |
| CN103466895A (en) * | 2013-09-25 | 2013-12-25 | 天津亿利科能源科技发展股份有限公司 | Advanced treatment system of polymer oilfield wastewater |
| CN105174657A (en) * | 2015-10-20 | 2015-12-23 | 波鹰(厦门)科技有限公司 | Treatment device and method for oil extraction wastewater |
| CN107473527A (en) * | 2017-09-29 | 2017-12-15 | 华北水利水电大学 | A kind of method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation |
| CN108164095A (en) * | 2018-01-16 | 2018-06-15 | 中冶华天南京工程技术有限公司 | A kind of technique and device for handling condensed oil sewage |
| CN108275844A (en) * | 2018-03-02 | 2018-07-13 | 安徽建筑大学 | A kind of light electrolysis-bioreactor of dynamic membrane device and waste water treatment process |
| CN108996839A (en) * | 2018-08-27 | 2018-12-14 | 深圳市凯宏膜环保科技有限公司 | A kind of refuse transfer station waste water treatment process and equipment |
| CN109052753A (en) * | 2018-08-31 | 2018-12-21 | 青岛双瑞海洋环境工程股份有限公司 | Re-injection water treatment system and re-injection method for treating water |
| CN110498569A (en) * | 2019-08-30 | 2019-11-26 | 四川达兴能源股份有限公司 | A kind of advanced treatment system and processing method of coking wastewater |
| CN111924933A (en) * | 2020-07-09 | 2020-11-13 | 腾泽科技(无锡)有限公司 | Water body ecological restoration technology |
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| CN101786772A (en) * | 2010-03-24 | 2010-07-28 | 哈尔滨工业大学 | Efficient biological treatment method for polymer-containing sewage in oil field |
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| CN2608491Y (en) * | 2003-04-06 | 2004-03-31 | 浙江欧美环境工程有限公司 | Immersion type hollow fiber membrane bioreactor assembly parts |
| CN1973969A (en) * | 2006-11-10 | 2007-06-06 | 天津膜天膜科技有限公司 | External pressed film assembly with double water outlet end |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214147A (en) * | 2013-04-16 | 2013-07-24 | 北京航空航天大学 | Oil-refining wastewater treatment method and device |
| CN103466895A (en) * | 2013-09-25 | 2013-12-25 | 天津亿利科能源科技发展股份有限公司 | Advanced treatment system of polymer oilfield wastewater |
| CN103466895B (en) * | 2013-09-25 | 2014-10-22 | 天津亿利科能源科技发展股份有限公司 | Advanced treatment system of polymer oilfield wastewater |
| CN105174657A (en) * | 2015-10-20 | 2015-12-23 | 波鹰(厦门)科技有限公司 | Treatment device and method for oil extraction wastewater |
| CN105174657B (en) * | 2015-10-20 | 2017-05-31 | 波鹰(厦门)科技有限公司 | The processing unit and method of a kind of oil extraction waste water |
| CN107473527A (en) * | 2017-09-29 | 2017-12-15 | 华北水利水电大学 | A kind of method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation |
| CN108164095A (en) * | 2018-01-16 | 2018-06-15 | 中冶华天南京工程技术有限公司 | A kind of technique and device for handling condensed oil sewage |
| CN108164095B (en) * | 2018-01-16 | 2021-04-09 | 中冶华天南京工程技术有限公司 | Process and device for treating thick oil sewage |
| CN108275844A (en) * | 2018-03-02 | 2018-07-13 | 安徽建筑大学 | A kind of light electrolysis-bioreactor of dynamic membrane device and waste water treatment process |
| CN108996839A (en) * | 2018-08-27 | 2018-12-14 | 深圳市凯宏膜环保科技有限公司 | A kind of refuse transfer station waste water treatment process and equipment |
| CN109052753A (en) * | 2018-08-31 | 2018-12-21 | 青岛双瑞海洋环境工程股份有限公司 | Re-injection water treatment system and re-injection method for treating water |
| CN109052753B (en) * | 2018-08-31 | 2022-05-06 | 青岛双瑞海洋环境工程股份有限公司 | Reinjection water treatment system and reinjection water treatment method |
| CN110498569A (en) * | 2019-08-30 | 2019-11-26 | 四川达兴能源股份有限公司 | A kind of advanced treatment system and processing method of coking wastewater |
| CN111924933A (en) * | 2020-07-09 | 2020-11-13 | 腾泽科技(无锡)有限公司 | Water body ecological restoration technology |
| CN111924933B (en) * | 2020-07-09 | 2022-11-22 | 腾泽科技(无锡)有限公司 | Device for water body ecological restoration and using method thereof |
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Application publication date: 20110629 |