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Electro-catalysis efficient decoloration method and device for oil field waste liquid

An electrocatalytic and electrocatalytic oxidation technology, which is applied in chemical instruments and methods, mining wastewater treatment, oxidized water/sewage treatment, etc., can solve the problem of large amount of hazardous chemicals, harsh operating conditions, and excessive chromaticity of combined station water. problems, to achieve the effect of reducing the cost of comprehensive treatment, reducing the dosage of chemical agents, and stabilizing the removal rate of chroma

Active Publication Date: 2018-11-27
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Domestic oilfield companies usually adopt physical and chemical treatment processes based on coagulation and flocculation processes, which require a large amount of chemical agents to be added, resulting in a large amount of sludge and low chroma removal efficiency. Exceeding the standard and other issues
[0004] For the decolorization of highly chromatic sewage, some researchers have adopted chemical oxidation processes such as Fenton oxidation, photocatalytic oxidation, and sodium hypochlorite oxidation. and other problems, the application in oilfield enterprises is limited

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  • Electro-catalysis efficient decoloration method and device for oil field waste liquid

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Embodiment Construction

[0039] In order to have a clearer understanding of the technical features, purpose and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of the present invention.

[0040] This embodiment provides a method for electrocatalytic and efficient decolorization of oilfield waste liquid, comprising the following steps:

[0041] Step 1, acidifying and aerating the operation waste liquid:

[0042] The object of treatment is waste liquid from an oilfield operation, and the treatment scale is 1.5m 3 / h, the pH value of the oilfield waste liquid is 6.9-7.5, and the COD is 2800-3450mg / L. Sulfuric acid is used to adjust the pH value of the oilfield waste liquid to 3.4-3.6, and the acidification is followed by aeration for 0.5h.

[0043] Step 2, the oilfield waste liquid treated by acidification and aeration is subjected to electrocatalytic oxidation treatment:

[004...

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Abstract

The invention provides an electro-catalysis efficient decoloration method and device for oil field waste liquid. The method comprises the following steps: carrying out acidification aeration treatmenton the oil field waste liquid; carrying out electro-catalysis oxidation treatment on the oil field waste liquid after the acidification aeration treatment; and after the electro-catalysis oxidation treatment, carrying out delayed standing stirring settling, so as to finish the efficient decoloration of the oil field waste liquid. By utilizing an acidification aeration preoxidation-electrocatalytic oxidation-delayed reaction settling combined process, the addition of a chemical agent in the treatment process of operation waste liquid is effectively reduced, the sludge output is decreased to bebelow 20% of that of a conventional chemical mixed flocculation process, the chroma removing rate is stabilized over 85%, and the comprehensive treatment cost is lowered by over 20%.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to an electrocatalytic high-efficiency decolorization method and device for oilfield waste liquid. Background technique [0002] There are many types of oilfield operation waste liquid, which contains a considerable amount of petroleum, suspended particles, inorganic salts, heavy metal ions, soluble small molecular organic matter and high molecular polymers. For sewage with high pollution load, compared with conventional produced water, the treatment of operational waste liquid is more difficult. If this kind of sewage is directly discharged, it will have a serious impact on the surrounding environment; direct reinjection will block the soil pores of the water injection layer and reduce the water absorption rate of the oil layer. [0003] Existing waste liquid treatment technologies may include: coagulation (flocculation), catalytic oxidation, air flotation se...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/461C02F1/72C02F103/10
CPCC02F1/46109C02F1/4672C02F9/00C02F2103/10C02F2209/06C02F2201/46175C02F2201/46125C02F2201/4612C02F2301/08C02F2209/42C02F1/286C02F1/66C02F7/00C02F2001/46138C02F2001/007
Inventor 刘译阳张晓飞张华罗臻吴百春
Owner BC P INC CHINA NAT PETROLEUM CORP
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