Electrocoagulation treatment method of wastewater from oil-field work

A treatment method and electro-flocculation technology, applied in flocculation/sedimentation water/sewage treatment, mining wastewater treatment, filtration treatment, etc., can solve the problems of complicated equipment maintenance, complicated manual operation, and high chemical operation cost

Inactive Publication Date: 2016-04-06
KARAMAY SANDA NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this method mainly include the following points: (1) The dosage of chemicals is large
(2) The operating cost of chemicals is high
(4) Manual operation is complex and cumbersome
(5) Complex equipment maintenance

Method used

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  • Electrocoagulation treatment method of wastewater from oil-field work
  • Electrocoagulation treatment method of wastewater from oil-field work
  • Electrocoagulation treatment method of wastewater from oil-field work

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Experimental program
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Embodiment 1

[0047] 1. Complete analysis of the water quality of waste liquid from an oilfield operation.

[0048] Table 1 Water Quality Full Analysis Data Table Unit: mg / l

[0049]

[0050] 2. After the above-mentioned sewage is treated, it must finally meet the following standards;

[0051] Table 2 Water quality compliance data table unit: mg / l

[0052] project

SS

Oil

Fe 2+

S 2-

Workover waste fluid

≤10

≤10

≤1.0

≤2.0

[0053] 3. Conventional processing method:

[0054] At this stage, the main process flow is: oilfield operation wastewater→gravity degreasing→coagulation sedimentation→filtration→reinjection.

[0055] Main steps: the first step, a kind of oilfield operation wastewater is separated from the floating oil in the degreasing device and waits until the mixed liquid. In the second step, the mixed liquid in the degreasing device enters the reaction tank through the lift pump for dosing reaction. The mixed solution is coag...

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Abstract

The invention belongs to the technical field of oil-field wastewater treatment and specifically relates to an electrocoagulation treatment method of wastewater from oil-field work. The method comprises the following steps: (1) carrying out oil separation and settlement treatment on wastewater from oil-field work by an oil removal device; (2) carrying out static settling, and pumping an intermediate-layer clear liquid in the wastewater through a lift pump into an electrocoagulation treatment device to react and carry out low-pressure pulse electrocoagulation treatment, wherein DC power control output current density is 1-50 mA / cm<2>, polar plate spacing is 0.5-4 cm, and electrolysis time is 1-15 min; (3) adjusting pH to 6-7 by adding NaOH, and entering a swirl-flow oil-water separator with three separator outlets for respectively outputting effluent, dross and sump oil; and (4) filtering the effluent by an active sand filter such that the effluent finally reaches the standard. The method is simple to operate and is economic and efficient.

Description

technical field [0001] The invention belongs to the technical field of oilfield sewage treatment, and in particular relates to an electric flocculation water treatment method for oilfield operation wastewater. Background technique [0002] The main sources of oil well operation wastewater are acidification waste liquid, fracturing waste liquid, cementing waste liquid, oil drilling waste liquid and well washing waste liquid. [0003] Among them, the characteristics of drilling waste fluid are: the composition of pollutants is complex, the solid particle size is fine, the gradation is poor, the appearance is viscous fluid or semi-fluid, the color is large, the water content is high and it is difficult to dehydrate (the water content is about 30%) -90%), high solid content, high viscosity, oily (some oil drilling wastewater has an oily content of more than 10%), etc. [0004] Among them, the acidizing waste liquid mainly refers to the residual acid liquid discharged from the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10
CPCC02F9/00C02F1/52C02F1/463C02F1/46109C02F1/001C02F1/40C02F1/38C02F2301/08C02F2001/46133C02F2103/10C02F2101/30C02F2101/32
Inventor 马超王澄滨王益军黄连华贾宝贵马兰
Owner KARAMAY SANDA NEW TECH
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