Integral treatment process of oily sewage of oil field

Abstract

The invention relates to an integral treatment process of the oily sewage of an oil field. The process flow in the invention is as follows: settling sand, removing oil, breaking emulsion through air flotation, treating with a microwave-enhanced Fenton system, performing flocculation and air flotation, performing precision filtering, performing catalytic ozonation with an activated carbon fiber felt, and performing ultrafiltration to obtain clean water. By adopting the integral treatment process, the operations of oil removal, emulsion breaking, advanced oxidation, flocculation, catalytic ozonation and membrane separation can be continuously realized. The floor space of equipment in the invention is small; the treatment process is suitable for various oily sewage and has obvious treatment effect; the removal rate of the chemical oxygen demand (COD) of raw water is more than 96%, and the oil content and the removal rate of suspended matters are 100%; and the turbidity of the obtained water is 4-6 NTU. The main indexes of the process provided by the invention such as the COD, oil content, suspended matters, turbidity and the like are better than those of the current oily sewage treatment process in oily sewage treatment; and the quality of the treated water can meet the related rules of the Integrated Wastewater Discharge Standard (GB8978-1996) and the Environmental Quality Standards for Surface Water (GB3838-2002).

Description

technical field [0001] The patent of the present invention relates to sewage treatment technology, more precisely, it belongs to the integrated treatment process of oily sewage in oil fields. Background technique [0002] my country's oil fields are widely distributed throughout the northeast, north, south-central, southwest, central China and southeast coastal areas. At present, most oil fields have entered the middle and late stages of oil exploitation, and the water content of the produced crude oil has reached 70-80%, and some oil fields even reach 90%. After oil-water separation, a large amount of oily sewage will be produced. Direct discharge will not only cause soil and water pollution, but sometimes even cause oil fire accidents, threatening people's lives, causing national economic losses, and also endangering the interests of the oil field itself. [0003] On the whole, oily wastewater from oil fields has the following common characteristics: (a) complex organic c...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an integrated treatment process for oily sewage in oilfields. According to the characteristics of oily sewage in oilfields, the treatment process integrates flotation, coagulation and flocculation, advanced oxidation technology, filtration and screening, catalytic ozonation technology and membrane filtration. technology, the integrated process embodies the synergistic effect of each treatment unit, and thoroughly solves a series of problems such as the complex water quality of oily sewage in oil fields and the difficulty in meeting the discharge standards.

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