CN102180566A - Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water - Google Patents
Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water Download PDFInfo
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- CN102180566A CN102180566A CN 201110066424 CN201110066424A CN102180566A CN 102180566 A CN102180566 A CN 102180566A CN 201110066424 CN201110066424 CN 201110066424 CN 201110066424 A CN201110066424 A CN 201110066424A CN 102180566 A CN102180566 A CN 102180566A
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Abstract
The invention discloses a process for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water. In the process, the oil-field produced water is treated in an oil removal tank unit, and then the treated oil-field produced water enters an electrocoagulation unit for physical-chemical treatment, enters an MBR (membrane bioreactor) unit for biochemical treatment and then is treated through an ultraviolet disinfection unit. The requirement on water quality of the reinjection water treated with the oil-field produced water is met. The treated reinjeciton water can steadily meet the technical requirements that SS is less than or equal to 1 mg/1, the particle size is equal to or smaller than 1 mum, and the oil content is equal to or lower than 1 mg/1; no coagulant is required to be added, thereby saving the cost of chemical preparations; the produced mud amount is only one half of that in the conventional process, so that the mud treatment cost is saved, and further the process is simple to maintain and saves daily maintenance cost; and the provided process not only can steadily meet the requirement on the water quality of the reinjection water treated with the oil-field produced water for a long time, has low treatment cost, but also prevents the environmental pollution from adding the coagulant.
Description
Technical field
The invention belongs to effluent sewage and handle and the reuse technology method, especially relate to materialization and biochemical treatment process combined method that a kind of oil field extracted water is used for re-injection.
Background technology
At present, oil field extracted water is used for the water quality of re-injection after treatment, and main water-quality guideline is oleaginousness and suspended substance, and comparatively Yan Ge requirement is that oleaginousness is no more than 1mg/l, SS is no more than 1mg/l, and grain diameter is no more than 1um.Now the oil field extracted water of Cai Yonging is used for the combination that the water treatment main technique of re-injection is settlement separate (or air supporting processing) and filtration treatment.Wherein, settlement separate (or air supporting processing) mainly contains settling methods, coagulation sedimentation, inclined plate sedimentation method, pressure settling process, gas flotation method and swirler method etc., also adopts the several method combination sometimes; Filtration treatment is mainly quartz sand filtration and walnut shell filter, and single layer filter, double medium filtration and bed filtration etc. are arranged.But the water technology that the existing oil field extracted water that adopts is used for re-injection has obvious defects: the one, and treat effluent can not reach re-injection water water quality requirement (oleaginousness≤1mg/l, SS≤1mg/l, grain diameter≤1um) steadily in the long term; The 2nd, processing costs is higher, and particularly coagulant precipitation or coagulation air-float need a large amount of chemical agents, and be with high costs; The 3rd, a large amount of mud environmental pollutions that coagulant precipitation or coagulation air-float produce are heavier, and particularly the interpolation because of coagulating agent (chemical agent) has produced new chemical pollution; The 4th, do not have COD, ammonia nitrogen and the disinfectant function of processing.
Summary of the invention
The problem that exists at the treatment Technology for Petroleum Water Flooding that is used for re-injection in the above-mentioned prior art, the invention provides a kind of can not only making after the oil field produced water treatment and can long-term stability reach re-injection water water quality requirement, and processing costs is low, and the oil field extracted water that does not produce environmental pollution because of the interpolation of coagulating agent is used for the materialization and the biochemical treatment process combined method of re-injection again.
The technical scheme that the technical problem to be solved in the present invention is taked is: can not only satisfy re-injection water water quality requirement after making oil field produced water treatment, and processing costs is low, do not produce environmental pollution again because of the interpolation of coagulating agent, materialization and biochemical treatment process combined method that described oil field extracted water is used for re-injection are: oil field extracted water is handled in the grease removal tank unit earlier, enter the single nothing of electricity flocculation again and carry out the materialization processing, enter the MBR unit again and carry out biochemical treatment, reach re-injection water water quality requirement after making oil field produced water treatment.
In order to remove the bacterium in the treat effluent after the oil field produced water treatment, described oil field extracted water is after reaching the requirement of re-injection water through grease removal tank unit, electricity flocculation unit and MBR cell processing, pass through the uv sterilisation cell processing again, thereby with the microorganism killing in the treat effluent.
For preventing that treat effluent exceeds standard under emergency case, when carrying out biochemical treatment, drop into a small amount of Powdered Activated Carbon simultaneously in the MBR unit, make treat effluent long-term stability reach re-injection water water quality requirement fully.
The present invention is made up of grease removal tank, electricity flocculation, MBR units in series, preferably carries out the uv sterilisation cell processing certainly after the MBR cell processing again, wherein said electricity flocculation unit, and its electricity flocculation pole plate material is a metallic aluminium, distance between plates is 1.5-2.5 centimetre; Strength of current is 5-10A, and can be by regulating impressed voltage change strength of current between pole plate.Wherein said MBR unit, the hydraulic detention time of waste water in MBR is 8-16 hour, and can regulate according to the water quality difference; The MBR unit adopts microfiltration membrane, and membrane pore size 0.1-0.8 micron can be selected according to concrete water quality situation.The MBR unit has emergency schedule: when the treat effluent oil-contg exceeds standard under special circumstances, can drop into a small amount of Powdered Activated Carbon, the dosage of gac is about 1mg/l.
The dominant mechanism of this processing method is:
1, oil field extracted water is at first by the floatable oily substance of grease removal tank cell processing and the most of density particulate matter greater than water, can very economical treating part effectively oil, suspended substance and organism, reduce the unitary processing load of subsequent disposal.
2,, enter the electricity flocculation unit in this technology again through the oil field extracted water after the grease removal tank preliminary treatment.The unitary main effect of electricity flocculation is oil and a suspended substance of handling the overwhelming majority, promotes BOD/COD value in the water outlet simultaneously.The unitary dominant mechanism of electricity flocculation is by the materialization effect, under impressed voltage, on the metallic aluminium pole plate, form the oxyhydroxide of aluminium, and generation microbubble, make that the colloid thing takes off surely in the waste water, collision forms flco mutually, flco under the drive of microbubble, on float to water surface, and then play the effect of removing most of oil and most suspended substances, promote BOD/COD value in the water outlet simultaneously, helped follow-up biochemical treatment.
3, through the oil field extracted water after the electricity flocculation cell processing, enter the MBR unit in this technology again.The unitary main effect of MBR is to handle most remaining suspended substances and oil, and a large amount of organism and ammonia nitrogen in the waste water.Its mechanism is, the filteration (aperture of MBR microfiltration membrane is the 0.1-0.8 micron) of effect, particularly microfiltration membrane by activated sludge absorption and microfiltration membrane in the MBR unit is guaranteed SS≤1mg/l and particle water particle diameter≤1um; Utilize mud can adsorb the characteristic of micro oil, handle organism and ammonia nitrogen by MBR and make that biological sludge is constantly bred, and regular discharging mud, thereby remaining most micro oils are taken out of outside the process system, reached water outlet oil≤1mg/l by mud discharging.
4, through the treat effluent after the MBR cell processing, its water-quality guideline has reached oleaginousness≤1mg/l, SS≤1mg/l, the re-injection water water quality requirement of grain diameter≤1um, enter the uv sterilisation unit in this technology again, be the mechanism of utilizing ultraviolet radiation for sterilizing and disinfecting, thereby with the microorganism killing in the treat effluent.
5, for preventing the situation that exceeding standard appears in treat effluent under sudden situation, this processing method has been considered emergency schedule simultaneously: can drop into a small amount of Powdered Activated Carbon (dosage of gac is about 1mg/L) in the MBR unit, can guarantee fully that treat effluent water quality is up to standard fully.
The present invention compared with prior art, the advantage that has is:
1, adopt this processing method treat effluent can reach re-injection water water quality requirement (oleaginousness≤1mg/l, SS≤1mg/l, grain diameter≤1um) steadily in the long term.The oil and the suspended substance of the overwhelming majority in the oil field extracted water can be removed in grease removal tank unit and electricity flocculation unit, and its treat effluent only contains oil and a spot of suspended substance of trace; Microfiltration membrane among the MBR can make treat effluent SS≤1mg/l, grain diameter≤1um; Among the MBR mud can planar water in remaining micro oil, make oil-contg≤1mg/l; Under special circumstances, can also be emergent by in MBR, adding small amount of activated, guarantee that treat effluent water quality reaches re-injection water water quality requirement steadily in the long term.
2, adopt this processing method can effectively reduce processing costs.Need not to add any coagulating agent under this technology normal circumstances, the expense of having saved chemical agent; The sludge quantity that this technology produces (comprising the sludge quantity of electricity flocculation generation and the sludge quantity that MBR produces) only for 1/2 of existing common process, has been saved the sludge treatment expense; This process maintenance is simple, has saved the routine maintenance expense.The electricity flocculation unit and the uv sterilisation unit of this process using, its power consumption is very low, and the expense of generation is far below existing common process (as air supporting); The MBR unit of this process using only needs limited aeration, so its current consumption is also very low.
3, this technology has significantly been improved environmental pollution.A large amount of mud environmental pollutions that existing process using coagulant precipitation or coagulation air-float produce are heavier, and particularly the interpolation because of coagulating agent (chemical agent) has produced new chemical pollution, and this technology does not adopt any chemical agent, can not form new chemical pollution.
4, the MBR unit of this technology has the COD that handles in the oil field extracted water, the function of ammonia nitrogen, and the uv sterilisation unit has the disinfectant function.
Description of drawings
Fig. 1 is materialization and the biochemical treatment process combined method flow synoptic diagram that oil field extracted water of the present invention is used for re-injection,
Fig. 2 is an electricity flocculation modular construction synoptic diagram of the present invention.
Grease removal tank unit 2, electricity flocculation unit 3, MBR unit 4, gac 5, uv sterilisation unit 6, oil field extracted water 7, treat effluent 8, pole plate in the drawings, 1.
Embodiment
Be example below with the oil field extracted water, in conjunction with the accompanying drawings 1, accompanying drawing 2 is specifically described:
Oil field extracted water 6 is at first by grease removal tank unit 1, and floatable oily substance and most of density obtain removing at this element greater than the particulate matter of water.Entering electricity flocculation unit 2 afterwards handles, by the materialization effect, under impressed voltage, on the pole plate 8 that metallic aluminium is made, form the oxyhydroxide of aluminium, and the generation microbubble, making that the colloid thing takes off surely in the waste water, collision forms flco mutually, flco is under the drive of microbubble, on float to water surface, and then remove most of oil and most suspended substances, and the water outlet oil-contg is lower than 5mg/l, and suspended substance (SS) is lower than 40mg/l; Electricity flocculation monomer pole plate material is a metallic aluminium, and distance between plates is 1.5-2.5 centimetre; Strength of current is controlled at 5-10A and can regulates, and purpose is according to concrete water quality difference, and impressed voltage changes strength of current between the pole plate 8 by regulating, and reaches the purpose of optimizing electric flocculation treatment effect.Enter MBR unit 3 afterwards and handle, the oil field extracted water through after the electricity flocculation cell processing enters the MBR unit in this technology again.Growth has microorganism among the MBR, but under the condition of aeration, in the microbiological deterioration water can biochemical organism and ammonia nitrogen, constantly breeding, micro oil in the planar water by regularly discharge active sludge (microorganism) from MBR, is discharged the oil of microorganism absorption outside the MBR simultaneously, reach the effect of oil removing, handled pollutents such as COD in the water and ammonia nitrogen simultaneously; Be provided with microfiltration membrane among the MBR, the aperture of microfiltration membrane is the 0.1-0.8 micron, and the water after the processing is discharged outside the MBR by microfiltration membrane, and active sludge and most particle diameter are tackled within MBR by microfiltration membrane greater than the suspended substance of 1um.Enter uv sterilisation unit 5 afterwards and handle, utilize ultraviolet radiation for sterilizing and disinfecting, the microorganism killing in the treat effluent 7.In addition, be the situation that prevents that exceeding standard appears in treat effluent water quality under sudden situation, can drop into a small amount of Powdered Activated Carbon in the MBR unit, the dosage of gac 4 is about 1mg/L.
Claims (5)
1. oil field extracted water is used for the materialization and the biochemical treatment process combined method of re-injection, it is characterized in that: described processing method is: oil field extracted water is handled in grease removal tank unit (1) earlier, enter electricity flocculation unit (2) again and carry out the materialization processing, enter MBR unit (3) again and carry out biochemical treatment, make treat effluent (7) reach re-injection water water quality requirement.
2. oil field extracted water according to claim 1 is used for the materialization and the biochemical treatment process combined method of re-injection, it is characterized in that: described oil field extracted water passes through uv sterilisation unit (5) again and handles after reaching re-injection water water quality requirement through grease removal tank unit, electricity flocculation unit and MBR cell processing.
3. oil field extracted water according to claim 1 is used for the materialization and the biochemical treatment process combined method of re-injection, it is characterized in that: when carrying out biochemical treatment in the MBR unit, drop into Powdered Activated Carbon (4) in the MBR unit.
4. oil field extracted water according to claim 1 and 2 is used for the materialization and the biochemical treatment process combined method of re-injection, it is characterized in that: described electricity flocculation pole plate (8) material is a metallic aluminium, and distance between plates is 1.5-2.5 centimetre; Strength of current is 5-10A, and impressed voltage changes strength of current between pole plate by regulating.
5. oil field extracted water materialization and the biochemical treatment process combined method that is used for re-injection according to claim 1 and 2, it is characterized in that: the hydraulic detention time in the described MBR unit is 8-16 hour, the microfiltration membrane aperture is the 0.1-0.8 micron in the MBR unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110066424 CN102180566A (en) | 2011-03-19 | 2011-03-19 | Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water |
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| CN 201110066424 CN102180566A (en) | 2011-03-19 | 2011-03-19 | Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193041A (en) * | 2014-09-24 | 2014-12-10 | 厦门福润源环保科技有限公司 | Treatment method of processing wastewater of jade |
| CN104556454A (en) * | 2015-01-09 | 2015-04-29 | 上海安赐机械设备有限公司 | Treatment device and treatment process of oilfield produced water as reinjection water |
| CN108640440A (en) * | 2018-06-07 | 2018-10-12 | 南京工程学院 | A kind of processing method of food and drink waste water |
| CN108773974A (en) * | 2018-06-07 | 2018-11-09 | 南京工程学院 | A kind of processing method of oil extraction waste water |
| CN113620517A (en) * | 2021-08-07 | 2021-11-09 | 金孚环保科技张家口有限公司 | Electrochemical-bulk sewage treatment device and method |
| CN115636478A (en) * | 2021-07-19 | 2023-01-24 | 中国石油天然气股份有限公司 | Sewage treatment method and device |
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| CN1510000A (en) * | 2002-12-23 | 2004-07-07 | 詹伯君 | High-concentrated emulsified oil waste water treating method |
| CN101050040A (en) * | 2007-05-14 | 2007-10-10 | 北京科技大学 | Apparatus for treating sewage containing oil, and processing technique |
| CN101708935A (en) * | 2009-11-30 | 2010-05-19 | 天津市塘沽区鑫宇环保科技有限公司 | Method for treating container washing wastewater |
| CN101786769A (en) * | 2010-03-10 | 2010-07-28 | 中国石油青海油田钻采工艺研究院 | Treatment process for sewage in oil field |
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Patent Citations (4)
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| CN1510000A (en) * | 2002-12-23 | 2004-07-07 | 詹伯君 | High-concentrated emulsified oil waste water treating method |
| CN101050040A (en) * | 2007-05-14 | 2007-10-10 | 北京科技大学 | Apparatus for treating sewage containing oil, and processing technique |
| CN101708935A (en) * | 2009-11-30 | 2010-05-19 | 天津市塘沽区鑫宇环保科技有限公司 | Method for treating container washing wastewater |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193041A (en) * | 2014-09-24 | 2014-12-10 | 厦门福润源环保科技有限公司 | Treatment method of processing wastewater of jade |
| CN104193041B (en) * | 2014-09-24 | 2016-02-03 | 厦门福润源环保科技有限公司 | A kind for the treatment of process of jade processing waste water |
| CN104556454A (en) * | 2015-01-09 | 2015-04-29 | 上海安赐机械设备有限公司 | Treatment device and treatment process of oilfield produced water as reinjection water |
| CN108640440A (en) * | 2018-06-07 | 2018-10-12 | 南京工程学院 | A kind of processing method of food and drink waste water |
| CN108773974A (en) * | 2018-06-07 | 2018-11-09 | 南京工程学院 | A kind of processing method of oil extraction waste water |
| CN115636478A (en) * | 2021-07-19 | 2023-01-24 | 中国石油天然气股份有限公司 | Sewage treatment method and device |
| CN113620517A (en) * | 2021-08-07 | 2021-11-09 | 金孚环保科技张家口有限公司 | Electrochemical-bulk sewage treatment device and method |
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Application publication date: 20110914 |