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

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...

AI Technical Summary

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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