Treatment recycle method of sewage from oil refinery

Abstract

The invention relates to a treatment recycle method of sewage from an oil refinery. The method comprises the following steps of 1, carrying out wet oxidation treatment on waste water containing basic residues, mixing the treated waste water containing basic residues and blow-off water of recirculated cooling water, and treating the mixed waste water orderly through a bological aerated filter and a high-grade oxidation and bological aerated filter, wherein the treated mixed waste water is used as fire-fighting water and miscellaneous water, 2, mixing waste water having low salt content, treating the mixed waste water orderly by oil removal, air floatation, biochemistry and bological aerated filters, carrying out sterilization and filtration, and feeding back the treated mixed waste water to a recirculated cooling water system, and 3, directly discharging acidic and alkaline waste water. The treatment recycle method of sewage from oil refinery can improve a recycle rate of sewage, realize zero discharge of sewage, and has the characteristics of simple operation, reliable technology and low investment and operation costs.

Description

technical field [0001] The invention relates to a treatment and reuse method for oil refinery sewage. Background technique [0002] my country is a country with a shortage of water resources. The per capita water resources are about 2,200 cubic meters, which is only a quarter of the world average. At the same time, due to the growth of our country's population, the water demand has approached the amount of water resources that can be developed and utilized. [0003] At present, the water intake and sewage for processing one ton of crude oil in my country are about 1.0 tons and 0.7 tons respectively, far higher than the international advanced level of 0.5 tons and 0.2 tons. A large amount of water intake and sewage discharge not only restricts the development of my country's oil refining industry, but also greatly consumes my country's available water resources. Recycling oil refining wastewater after treatment can not only solve the environmental pollution problem of waste...

AI Technical Summary

Problems solved by technology

② Newly developed water saving and emission reduction technologies are not practical

Since the end of the 1990s, oil refining companies have intensified research and development of water-saving and emission-reduction technologies, and proposed some new water-saving and emission-reduction technologies, but these technologies are not reliable and cannot be used well by enterprises; The economy is unreasonable, and enterprises cannot afford it (such as membrane separation technology)

③Water saving and emission reduction technologies do not match

The oil refining process is complicated, and the supporting water system involves water supply, water use, drainage and other systems. Not only the water volume is different, but also the water quality requirements are also different, which is complicated and huge

Although the newly developed unit water saving and emission reduction technology can solve some local problems, the overall effect is not obvious because the technology is not matched.

[0005] Some oil refining enterprises have adopted the measures of "cleaning and diverting sewage, separating and treating sewage", so that high and low concentration wastewater can be treated separately. The overall treatment effect is good, but the sewage reuse rate is still low

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