CN103951139A - Oilfield wastewater treatment process - Google Patents

Oilfield wastewater treatment process Download PDF

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Publication number
CN103951139A
CN103951139A CN201410169147.3A CN201410169147A CN103951139A CN 103951139 A CN103951139 A CN 103951139A CN 201410169147 A CN201410169147 A CN 201410169147A CN 103951139 A CN103951139 A CN 103951139A
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China
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sewage
treatment
water
agent
oil field
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CN201410169147.3A
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Chinese (zh)
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文继庆
刘鹏
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文继庆
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Priority to CN201410169147.3A priority Critical patent/CN103951139A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The invention relates to an oilfield wastewater treatment process. The oilfield wastewater treatment process comprises the following steps of (a) carrying out an electrolytic treatment on sewage to be treated by an electrocoagulation device and removing moisture and impurities by flotation sewage drainage and sedimentation sewage drainage; (b) adding a treatment chemical agent into sewage treated by the electrocoagulation device by a chemical agent adding device and mixing fully in a mixing device; and (c) enabling the sewage which is added with the chemical agent and mixed to enter an efficient activated sludge water purifier and reacting to form activated sludge and further filtering. According to the oilfield wastewater treatment process, the oilfield wastewater is treated by electro-oxidation flocculation in combination with efficient activated sludge water purification process, so that the dosage of water treatment chemical agents is reduced and the eutrophication of the formation water quality is avoided.

Description

A kind for the treatment of process for sewage in oil field
Technical field
The present invention relates to a kind of sewage treatment process, specifically refer to a kind for the treatment of process for sewage in oil field flow process.
Background technology
Current disposing polluted water in oil is conventional two kinds of methods: a kind of is the treatment process of taking traditional gravity floatation+coagulant precipitation+filtering under pressure+corrosion-mitigation scale-inhibition adding of agent, this technique is by gravity natural subsidence and aeration flotation, preliminary larger suspended substance and the free oil of proportion of removing, then add coagulated agent, make suspended substance in conjunction with the difference in specific gravity that forms larger flocs unit increase suspended substance and water, reach and accelerate the suspended particle object separated with sewage, finally, by cascade filtration technology, further reduce suspended substance and oil-contg in water outlet.And for corrosion and scaling and the problem of bacteria of injected water, by adding a certain amount of inhibiter, scale inhibitor and sterilant, solve.
The treatment process of this traditional gravity floatation+coagulant precipitation+filtering under pressure+corrosion-mitigation scale-inhibition adding of agent need to be controlled water quality by adding in a large number expensive chemical agent, production cost is high, and add chemical agent general only in the early stage effect relatively good, As time goes on, bacterium in water produces resistance, the treatment effect of medicament reduces greatly, add for a long time simultaneously and in chemical agent, generally contain the nutritive elements such as organophosphorus, cause the eutrophication of bottom water quality, make bacterium amount reproduction, the fouling of waterflood system, the problems such as corrosion will come out again, need constantly again to screen the chemical agent of compatibility, this technique is also poor for sulfur-bearing, water quality adaptability that iron content is higher, can not educate these harmful ions of removal of effect, has aggravated the corrosion of waterflood system pipe-line equipment.
Another is water quality modification technology, with white lime Ca (OH) 2for mainly adding medicament, sewage PH is promoted to 8.5 left and right, remove the CO in sewage 3 2-, HCO 3 -, iron ion, S 2-and prevent from the object of corrosion being aided with polymeric flocculant and water quality stabilizer, remove mechanical impurity and oil, play and purify and the object of stable effluent quality. simultaneously
Water quality modification technology, owing to having promoted the pH value of sewage, has solved the etching problem of waterflood system substantially, but owing to having added a large amount of Ca (OH) 2the Ca of supersaturation concentration in water 2+very easily fouling, causes the obstructions such as waterflood system pipeline, and can cause immediate vicinity of wellbore reservoir choke after injecting stratum, and reservoir permeability is reduced day by day, and the water-retaining capacity of water injection well declines, and directly has influence on production of hydrocarbons.And Ca (OH) 2add in a large number, in feedwater, brought a large amount of insoluble solids, simultaneously, increasing substantially of system pH value, form precipitation also to part high valence ion condition is provided, formed a large amount of mud, not only to environmental protection, bring immense pressure, surrounding enviroment are caused to certain injury, and produce high sludge treatment expense.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind for the treatment of process for sewage in oil field, it adopts the technique of electrooxidation one flocculation+high-efficiency activated mud water purification to process oil field waste, not only reduce the dosage of chemistry in water treatment medicament, and avoided local water Water Eutrophication.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind for the treatment of process for sewage in oil field, it is characterized in that, and mainly comprise the following steps:
(a) pending sewage is carried out to electrolysis treatment by electric flocculation plant, and, removal with precipitation blowdown, impurity is separated with water by flotation blowdown;
(b) sewage after electric flocculation plant processing adds treatment agent by chemicals dosing plant and fully mixes in mixing device;
(c) adding medicament mixed sewage enters high-efficiency activated mud water purifier and react and form active sludge, further filtration treatment.
In described step (a), sewage being carried out in electric flocculation plant to electrolysis treatment further comprises:
(a.1) at described electric flocculation plant, be provided with electrolyzer, in described electrolyzer, equidistant parallel is arranged iron and graphite electrode plate, sewage through lift pump from storage tank by sewage transport in the electrolyzer of electric flocculation plant, through electrolyzer, carry out electrolytic oxidation, electrolytic reduction, electrofloatation and electrolytic flocculation and process;
(a.2) floating matter of gained after electrolysis treatment and throw out are disposed to respectively to waste oil collecting groove and sludge thickener by flotation blowdown, precipitation drainage.
After electric flocculation plant being processed in described step (b), sewage dosing combination treatment further comprises:
(b.1) adopt the sewage after middle water pump is processed step (a.1) to be delivered to chemical-dosing mixer from intermediate water tank;
(b.2) adopt dosing pump to add the medicament preparing in sewage, and medicament and sewage are fully mixed in mixing tank, to adding treatment agent to comprise in sewage, adopt respectively dosing pump from medicament preparing tank, PH conditioning agent, water purification agent and flocculation agent thereof to be added mixing tank; Described PH conditioning agent is formulated by the mass ratio of 9: 1 by slaked lime and NaOH, and sewage PH value is adjusted to 7.0-7.5; Described water purification agent adopts wilkinite composite water purifying agent, dosage 30-50mg/L; Described flocculation agent adopts anionic and molecular weight at more than 1,000 ten thousand high polymer polyacrylamides, and dosage is 5mg/L.
In described step (c), by high-efficiency activated mud water purifier, carrying out filtration treatment further comprises:
(c.1) sewage transport after processing in step (b.2) to efficient active sludge water purifier is filtered;
(c.2) mud discharging of sedimentation and filtration joint being held back is to sludge thickener;
(c.3) will process rear qualified water by the re-injection of re-injection water pump.
For can circular treatment to the mud of discharge, to described, through step (a.2) and step (c.2), be disposed to mud in sludge thickener after sedimentation, with fresh water pump, supernatant liquor is returned in sewage storage tank, and repeating step (a), step (b) and step (C) successively.
To being disposed to mud in sludge thickener after sedimentation, adopting sludge pump that bottom mud is extracted out and carry out drying and other treatment.
To sum up, the invention has the beneficial effects as follows: adopt electrooxidation one flocculation+high-efficiency activated mud water purification technology to process oilfield sewage, method by physics realizes the effect that purifies water, controls burn into inhibition fouling, kill bacteria, reduce the dosage of chemistry in water treatment medicament, avoid local water Water Eutrophication, the problems such as the resistance of bacterium, the compatibleness of raising injected water and local water, reduces water treatment running cost; Remove the harmful ions such as removing ferro in water, sulphur, avoided the friendship of water quality in the injecting process, realize the stable of water quality simultaneously.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment the present invention adopts the technique of electrooxidation one flocculation+high-efficiency activated mud water purification to process oil field waste.
As shown in Figure 1, technical process of the present invention is as follows: wastewater storage tank water is first in lift pump is promoted to the built-in electrolyzer of electric flocculation apparatus, in electrolyzer, equidistant parallel is arranged iron and graphite electrode plate, unlike material battery lead plate ratio is determined according to parameters such as water quality sulphur and bacteria contents, sewage is electrolysis in electrolyzer, the oxygenizement that simultaneously can produce electrolysis, electrolytic reduction effect, electrofloatation effect, electrolytic flocculation effect.Thus, the positively charged ion in sewage is as H +at electrolyzer inner cathode annex, obtain electronics and be reduced into hydrogen.Other metal ions K in all the other water +, Na +owing to thering is its activity in water, still with ionic state, exist.And the negatively charged ion in sewage with electrolysis betatopic activity is as Cl -, OH -near electrolyzer inner anode, lose electronics and be oxidized to Cl 2, O 2, the Cl of generation 2extremely water-soluble formation ClO -, a large amount of ClO -sewage is had to powerful sterilization and disinfection effect, with this, reduce the bacterium of removing in water.The a large amount of H that generate in anode and cathode 2and O 2, its bubble is little, and dispersity is high, as carrier, adheres to lightweight oil in water and suspended substance and floats, and through overflow groove, arranges outward, reaches the effect of oil removing.Simultaneously because soluble metal electrolysis in electrolytic process produces a large amount of positively charged ions, with the OH in water -effect, forming metal hydroxides colloid flocculation agent by the pollution substance adsorption precipitation in waste water or forming larger particles provides favourable condition for subsequent disposal.
Through electrooxidation one flocculation, go to the waste water process after reason to add PH conditioning agent, PH is adjusted to after 7.0-7.5, described PH conditioning agent adopts slaked lime and NaOH to prepare in the ratio of 9: 1, and dosage is according to sewage PH dynamic adjustments, the Fe in water 2+s in ion and water 2-in conjunction with generating FeS, precipitate, add again a small amount of water purification agent and coagulant aids, described water purification agent adopts wilkinite composite water purifying agent, dosage 30-50mg/L, volume pump quantitatively adds, described coagulant aids adopts high polymer polyacrylamide, anionic, molecular weight is more than 1,000 ten thousand, dosage 5mg/L, volume pump quantitatively adds, after making waste water enter high-efficiency activated mud water purifier, flco rapid subsidence forms high-efficiency activated sludge filtering layer, this filtering layer is by surface physics absorption, net is caught the effect of effect and electrochemical properties and Van der Waals force, by suspensoid particle, flco, part bacterium thalline etc. impurity is all tackled on this high-efficiency activated sludge filtering layer, make effluent quality reach processing requirements.
The effluent quality index that this technique is processed oil field waste can reach the water filling proposed standard of China National Petroleum industry standard < < petroclastic rock reservoir water water-quality guideline and analytical procedure > > (SY/T5329-94):
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, the equivalent variations in every foundation technical spirit of the present invention, above embodiment done, within all falling into protection scope of the present invention.

Claims (7)

1. a treatment process for sewage in oil field, is characterized in that, mainly comprises the following steps:
(a) pending sewage is carried out to electrolysis treatment by electric flocculation plant, and, removal with precipitation blowdown, impurity is separated with water by flotation blowdown;
(b) sewage after electric flocculation plant processing adds treatment agent by chemicals dosing plant and fully mixes in mixing device:
(c) adding medicament mixed sewage enters high-efficiency activated mud water purifier and react and form active sludge, further filtration treatment.
2. a kind for the treatment of process for sewage in oil field according to claim 1, is characterized in that, in described step (a), sewage is carried out in electric flocculation plant to electrolysis treatment and further comprises:
(a.1) at described electric flocculation plant, be provided with electrolyzer, sewage through lift pump from storage tank by sewage transport in the electrolyzer of electric flocculation plant, through electrolyzer, carry out electrolytic oxidation, electrolytic reduction, electrofloatation and electrolytic flocculation and process;
(a.2) floating matter of gained after electrolysis treatment and throw out are disposed to respectively to waste oil collecting groove and sludge thickener by flotation blowdown, precipitation drainage.
3. a kind for the treatment of process for sewage in oil field according to claim 2, is characterized in that, in described step (a.1), in described electrolyzer, equidistant parallel is arranged iron and graphite electrode plate.
4. according to a kind for the treatment of process for sewage in oil field described in claim 2 or 3, it is characterized in that, after in described step (b), electric flocculation plant being processed, sewage dosing combination treatment further comprises:
(b.1) adopting middle water pump that step (a.1) is processed to rear sunlight sewage is delivered to chemical-dosing mixer from intermediate water tank;
(b.2) adopt dosing pump to add the medicament preparing in sewage, and medicament and sewage are fully mixed in mixing tank.
5. a kind for the treatment of process for sewage in oil field according to claim 4, it is characterized in that, in described step (b.2), to adding treatment agent to comprise in sewage, adopt respectively dosing pump from medicament preparing tank, PH conditioning agent, water purification agent and flocculation agent thereof to be added mixing tank.
6. a kind for the treatment of process for sewage in oil field according to claim 5, is characterized in that, described PH conditioning agent is formulated by the mass ratio of 9: 1 by slaked lime and NaOH, and sewage PH value is adjusted to 7.0-7.5; Described water purification agent adopts wilkinite composite water purifying agent, dosage 30-50mg/L; Described flocculation agent adopts anionic and molecular weight at more than 1,000 ten thousand high polymer polyacrylamides, and dosage is 5mg/L.
7. a kind for the treatment of process for sewage in oil field according to claim 6, is characterized in that, carries out filtration treatment further comprise in described step (c) by high-efficiency activated mud water purifier:
(c.1) sewage transport after processing in step (b.2) to efficient active sludge water purifier is filtered;
(c.2) mud discharging of sedimentation and filtration joint being held back is to sludge thickener;
(c.3) will process rear qualified water by the re-injection of re-injection water pump.
CN201410169147.3A 2014-04-16 2014-04-16 Oilfield wastewater treatment process Pending CN103951139A (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104609613A (en) * 2014-12-26 2015-05-13 北京京润新技术发展有限责任公司 Treatment device and treatment method for catalyst wastewater
CN104609612A (en) * 2014-12-12 2015-05-13 叶舒帆 Landfill leachate electrochemical treatment method
CN105888613A (en) * 2014-12-23 2016-08-24 桂淑华 Deep-well injection process of drilling cuttings
CN109354134A (en) * 2018-10-24 2019-02-19 东莞市三人行环境科技有限公司 A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent
CN110482050A (en) * 2019-07-25 2019-11-22 广东石油化工学院 A kind of control system and method for the anticorrosion process of refined oil storage tank

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104609612A (en) * 2014-12-12 2015-05-13 叶舒帆 Landfill leachate electrochemical treatment method
CN105888613A (en) * 2014-12-23 2016-08-24 桂淑华 Deep-well injection process of drilling cuttings
CN104609613A (en) * 2014-12-26 2015-05-13 北京京润新技术发展有限责任公司 Treatment device and treatment method for catalyst wastewater
CN109354134A (en) * 2018-10-24 2019-02-19 东莞市三人行环境科技有限公司 A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent
CN109354134B (en) * 2018-10-24 2021-10-08 东莞市三人行环境科技有限公司 Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation
CN110482050A (en) * 2019-07-25 2019-11-22 广东石油化工学院 A kind of control system and method for the anticorrosion process of refined oil storage tank
CN110482050B (en) * 2019-07-25 2021-03-23 广东石油化工学院 Control system and method for anticorrosion process of finished oil storage tank

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Application publication date: 20140730