CN106430746A - Process for pretreating natural gas produced water with electric flocculation - Google Patents

Process for pretreating natural gas produced water with electric flocculation Download PDF

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Publication number
CN106430746A
CN106430746A CN201610751637.3A CN201610751637A CN106430746A CN 106430746 A CN106430746 A CN 106430746A CN 201610751637 A CN201610751637 A CN 201610751637A CN 106430746 A CN106430746 A CN 106430746A
Authority
CN
China
Prior art keywords
electric flocculation
water outlet
gas exploitation
technique
natural gas
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.)
Pending
Application number
CN201610751637.3A
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Chinese (zh)
Inventor
张涛
蒲毅智
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Xing'ao Environmental Technology Service Co Ltd
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Sichuan Xing'ao Environmental Technology Service Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sichuan Xing'ao Environmental Technology Service Co Ltd filed Critical Sichuan Xing'ao Environmental Technology Service Co Ltd
Priority to CN201610751637.3A priority Critical patent/CN106430746A/en
Publication of CN106430746A publication Critical patent/CN106430746A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities

Abstract

The invention relates to a process for treating natural gas produced water, in particular to a process for pretreating natural gas produced water with electric flocculation. The process comprises the following steps: a, adjusting the pH value of natural gas produced water to 7-8; b, performing electric flocculation on the natural gas produced water after adjusting the pH value through electric flocculation equipment; c, filtering the natural gas produced water after electric flocculation, to remove flocculation sediments. For the natural gas produced water containing complex components and more colloidal suspended substances, the treatment process of the pretreatment method can remove the vast majority of colloidal and suspended substances, is simple in process operation, unnecessary to add any chemical agent, high in treatment efficiency, good in effect, low in cost, small in equipment size, easy to achieve automated management, and small in amount of mud produced during reaction.

Description

A kind of technique of employing electric flocculation pretreatment Gas Exploitation water outlet
Technical field
The present invention relates to the handling process of Gas Exploitation water outlet is and in particular to a kind of adopt electric flocculation pretreatment Gas Exploitation The technique of water outlet.
Background technology
Gas Exploitation water outlet is to be extracted with natural gas, and after aqueous vapor separation and processed, abjection is useless Water.Gas Exploitation effluent quality complicated component, because gas field geographical position and exploitation, the difference of refining process and have larger difference Not.This kind of waste water mainly adopts deep-well re-injection after simple process at present, but still suffers from being limited by individual well re-injection amount, freight Height, descends gas-bearing formation exploitation to produce the factors such as impact over the ground.Oil gas field high slat-containing wastewater intractability is big, and oil and natural gas enterprise exists There is provided and while a large amount of clean energy resourcies and industrial chemicals, also create serious environmental pollution.How effectively to administer exploitation and use The environmental pollution causing during oil, it has also become the important topic that field of Environment Protection faces.Need to develop further and be applied to stone The handling process of oily Gas Industry high salt extracted waste water, improves reclamation rate after the process of Oil/gas Well recovered water, reduces existing place The environmental protection risk of reason mode and operating cost.
Content of the invention
For above the deficiencies in the prior art, the invention provides a kind of environmental protection, Gas Exploitation water outlet can be removed very well Colloidal suspended substance, the technique of the pretreatment Gas Exploitation water outlet of impurity such as Organic substance.
In order to achieve the above object, the invention provides a kind of technique of employing electric flocculation pretreatment Gas Exploitation water outlet, Comprise the following steps:
A, the pH value of Gas Exploitation water outlet is adjusted to 7~8;
B, electric flocculation equipment is passed through in Gas Exploitation water outlet after overregulating for the pH value, carry out electric flocculation;
C, the Gas Exploitation after electric flocculation is gone out water filtration, remove flocculating sedimentation thing.
Preferably, in described step a, the pH value of Gas Exploitation water outlet is adjusted to 7.2~7.6.
Preferably, in described step b, electric flocculation equipment is flow-type, and its battery lead plate is aluminium sheet or iron plate, effecting reaction face Amass as 100~300cm2.
Preferably, the distance between the minus plate of described electric flocculation and positive plate are 20~50mm, the connected mode of electrode For multipole connected mode, and the spaced multigroup distribution in electric flocculation equipment of yin, yang pole plate.
Preferably, current intensity during Gas Exploitation water outlet electric flocculation is 6~12A.
Preferably, current intensity during Gas Exploitation water outlet electric flocculation is 6~9A.
Preferably, the time in electric flocculation for the Gas Exploitation water outlet is 9~11min.
Preferably, in step c, by before the Gas Exploitation of electric flocculation goes out water filtration, first staticly settling 20~ 40min.
Preferably, after staticly settling, the suspension foam on liquid level is struck off, then carry out flocculating sedimentation again, then use plate Frame Filter Press, gained filtrate is the good waste water of pretreatment.
Beneficial effects of the present invention are:Technique scheme is that a kind of dependence additional power source energising is electrolysed to waste water The electrochemical treatments mode of reason, its reaction principle is with metal as anode, and in the presence of unidirectional current, anode is dissoluted, and produces Metal ion, through a series of hydrolysis, polymerization and oxidizing process, develops into various hydroxo complexes, multinuclear hydroxo complex So that hydroxide, make colloidal state impurity in waste water, suspended impurity coagulative precipitation and separation;Meanwhile, powered polluter Grain swimming in the electric field, its Partial charge is neutralized by electrode and promotes it to take off steady coagulation;And the bubble producing in negative electrode has air supporting , also there is redox reaction in electrolytic process in detached effect, can remove partial organic substances.
In technique scheme main reaction be flocculation sediment, dissolved air flotation, oxidoreduction these three, by electrochemistry, Chemical coagulation and three kinds of technology of electric floating are effectively combined;For complicated component, the more natural gas of colloidal suspended substance Recovered water, can remove most colloids and suspended material using technique scheme, and technological operation is simple, need not add and appoint What chemical agent, treatment effeciency is fast, and effect is good, low cost, and equipment volume is little, easily realizes automated management, and reaction sludge output is few.
Specific embodiment
For making those skilled in the art understand production technology and the technique effect of the present invention in detail, produced with specific below Example is being further described application and the technique effect of the present invention.
Embodiment 1
The pH value of Gas Exploitation water outlet is adjusted to 7, and installs a size of surface area in mobile electric flocculation equipment For 100mm2Aluminium sheet, plate spacing 20mm, the connected mode of electrode is multipole connected mode, and yin, yang pole plate is in a cell Spaced multigroup distribution.Waste water is squeezed in electric flocculation equipment by turn on pump, starting impulse power supply, and regulation current intensity is 6A, so After start electric flocculation reaction, the setting response time be 9min;After the completion of reaction, waste water staticly settles 20min, then adopts sheet frame Filter Press, filtrate is the good recovered water of pretreatment.
Embodiment 2
The pH value of Gas Exploitation water outlet is adjusted to 7.2, and installs a size of 274mm in mobile electric flocculation equipment × 72mm × 2mm, surface area are 170mm2Aluminium sheet, plate spacing 30mm, the connected mode of electrode is multipole connected mode, and The spaced multigroup distribution in a cell of yin, yang pole plate.Waste water is squeezed in electric flocculation equipment by turn on pump, starting impulse power supply, Regulation current intensity is 9A, then starts electric flocculation reaction, and the setting response time is 10min;After the completion of reaction, waste water standing is heavy Shallow lake 30min, then adopts filter press to filter, filtrate is the good recovered water of pretreatment.
Embodiment 3
The pH value of Gas Exploitation water outlet is adjusted to 7.6, and installs a size of surface in mobile electric flocculation equipment Amass as 200mm2Aluminium sheet, plate spacing 35mm, the connected mode of electrode is multipole connected mode, and yin, yang pole plate is in electrolysis bath In spaced multigroup distribution.Waste water is squeezed in electric flocculation equipment by turn on pump, starting impulse power supply, and regulation current intensity is 9A, Then start electric flocculation reaction, the setting response time is 10min;After the completion of reaction, waste water staticly settles 30min, then adopts Filter press filters, and filtrate is the good recovered water of pretreatment.
Embodiment 4
The pH value of Gas Exploitation water outlet is adjusted to 8, and installs a size of surface area in mobile electric flocculation equipment For 250mm2Aluminium sheet, plate spacing 40mm, the connected mode of electrode is multipole connected mode, and yin, yang pole plate is in a cell Spaced multigroup distribution.Waste water is squeezed in electric flocculation equipment by turn on pump, starting impulse power supply, and regulation current intensity is 12A, so After start electric flocculation reaction, the setting response time be 11min;After the completion of reaction, waste water staticly settles 40min, then adopts plate Frame Filter Press, filtrate is the good recovered water of pretreatment.
Embodiment 5
The pH value of Gas Exploitation water outlet is adjusted to 7.6, and installs a size of surface in mobile electric flocculation equipment Amass as 300mm2Aluminium sheet, plate spacing 50mm, the connected mode of electrode is multipole connected mode, and yin, yang pole plate is in electrolysis bath In spaced multigroup distribution.Waste water is squeezed in electric flocculation equipment by turn on pump, starting impulse power supply, and regulation current intensity is 12A, Then start electric flocculation reaction, the setting response time is 10min;After the completion of reaction, waste water staticly settles 40min, then adopts Filter press filters, and filtrate is the good recovered water of pretreatment.
Each sample in waste water after treatment from embodiment 1~5, be respectively designated as sample 1, sample 2, sample 3, Sample 4, sample 5, then carry out the detection of turbidity and colloidal content to the sample sampling and undressed Gas Exploitation water outlet Analysis, such as table 1 below.
Table 1
Sample Turbidity (NTU) Colloid (g/L) Turbidity removal rate (%) Colloid clearance (%)
Gas Exploitation water outlet 27.4 1.165 / /
Sample 1 5.0 0.136 81.75 88.33
Sample 2 2.9 0.0882 89.42 92.43
Sample 3 2.3 0.0676 91.61 94.20
Sample 4 1.6 0.0404 94.16 96.53
Sample 5 2.1 0.0569 92.34 95.12
By table 1, Gas Exploitation water outlet is processed using technical scheme provided by the present invention, Ke Yiyou Effect ground removes the colloid in Gas Exploitation water outlet and reduces its turbidity, and electric flocculation method pretreatment Gas Exploitation water outlet is also described simultaneously Anti- load-bearing capacity strong, it is fast to reach speed, efficiency high, the requirement of low cost.

Claims (9)

1. a kind of technique using electric flocculation pretreatment Gas Exploitation water outlet is it is characterised in that comprise the following steps:
A, the pH value of Gas Exploitation water outlet is adjusted to 7~8;
B, electric flocculation equipment is passed through in Gas Exploitation water outlet after overregulating for the pH value, carry out electric flocculation;
C, the Gas Exploitation after electric flocculation is gone out water filtration, remove flocculating sedimentation thing.
2. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 1 technique it is characterised in that:Described step In rapid a, the pH value of Gas Exploitation water outlet is adjusted to 7.2~7.6.
3. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 1 technique it is characterised in that:Described step In rapid b, electric flocculation equipment is flow-type, and its battery lead plate is aluminium sheet or iron plate, and effective affecting acreage is 100~300cm2.
4. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 3 technique it is characterised in that:Described electricity The distance between the minus plate of flocculation and positive plate are 20~50mm, and the connected mode of electrode is multipole connected mode, and yin, yang Pole plate spaced multigroup distribution in electric flocculation equipment.
5. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 4 technique it is characterised in that:Natural gas Current intensity during recovered water electric flocculation is 6~12A.
6. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 5 technique it is characterised in that:Natural gas Current intensity during recovered water electric flocculation is 6~9A.
7. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 6 technique it is characterised in that:Natural gas The time in electric flocculation for the recovered water is 9~11min.
8. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 1 technique it is characterised in that:Step c In, by before the Gas Exploitation of electric flocculation goes out water filtration, first staticly settle 20~40min.
9. employing electric flocculation pretreatment Gas Exploitation water outlet according to claim 8 technique it is characterised in that:Standing is heavy Behind shallow lake, the suspension foam on liquid level is struck off, then carry out flocculating sedimentation again, then filtered with filter press, gained filtrate It is the good waste water of pretreatment.
CN201610751637.3A 2016-08-29 2016-08-29 Process for pretreating natural gas produced water with electric flocculation Pending CN106430746A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107311375A (en) * 2017-06-02 2017-11-03 四川兴澳环境技术服务有限公司 Low concentration Produced Water In Oil-gas Fields, Ngi Zero discharge treatment method
CN109133404A (en) * 2017-06-16 2019-01-04 江苏立业环境科技有限公司 A kind of gas drilling waste water treatment process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105329989A (en) * 2015-11-01 2016-02-17 华南理工大学 Electric flocculation method for pretreating high-concentration polluted wastewater of glyphosate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105329989A (en) * 2015-11-01 2016-02-17 华南理工大学 Electric flocculation method for pretreating high-concentration polluted wastewater of glyphosate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107311375A (en) * 2017-06-02 2017-11-03 四川兴澳环境技术服务有限公司 Low concentration Produced Water In Oil-gas Fields, Ngi Zero discharge treatment method
CN109133404A (en) * 2017-06-16 2019-01-04 江苏立业环境科技有限公司 A kind of gas drilling waste water treatment process

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Application publication date: 20170222