Method for oil refinery sewage classification control and grading treatment

Abstract

The invention relates to a method for oil refinery sewage classification control and grading treatment. The method divides oil refinery sewage into seven types of oil-containing sewage, sulfur-containing sewage, electro-desalting sewage, mixed alkaline residue sewage, low-concentration clean waste water, polluted rainwater in a plant area, and domestic sewage. The method comprises a source control process, a high-density sewage pretreatment process, a reclaimed water reuse or cascade use process, and a centralized separation treatment process on sewage in a sewage treatment plant. The method realizes high-proportion utilization of stripping purified water, complete recycle of oil-containing sewage, high-proportion recycle of low-concentration clean waste water, and stabilization and standardization treatment on high-concentration salt-containing sewage. The method realizes the purposes of water saving and emission reduction in oil refinery sewage treatment.

Description

technical field [0001] The invention relates to a method for classifying, controlling and grading treatment of oil refinery sewage, which is suitable for sewage treatment of newly-built or rebuilt or expanded oil refineries of refinery enterprises. Background technique [0002] Oil refinery sewage is the sewage produced in the process of crude oil refining, processing and oil washing. It is a multi-phase system integrating suspended oil, emulsified oil, dissolved organic matter and inorganic salt. It is mainly composed of petroleum, COD, Pollutants such as BOD, sulfide, volatile phenol, suspended solids, and ammonia nitrogen. At present, oil refining sewage is mainly treated by centralized mixed treatment, that is, the oily sewage discharged from each production unit, the sulfur-containing sewage, the purified water after pretreatment by steam stripping, and domestic wastewater are mixed and then separated through oil separation-flotation to biochemical "old three". Set of ...

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Problems solved by technology

However, the inventive method only adds appropriate pretreatment facilities to ultra-high concentration sewage on the basis of the existing sewage treatment process, without considering the reduction of pollution load and water quality control from the source of the device, and does not mention reclaimed water reuse or Cascading use methods, fundamentally speaking, still have not escaped from the framework of terminal sewage treatment

This method only makes a simple distinction from the concentration of organic pollutants, without considering the differential treatment of other pollutants

In addition, for the low-concentration saline wastewater with large discharge from the refinery, such as circulating water field sewage, boiler sewage, chemical water station drainage, and plant rainwater, etc., are not included in the treatment system, which makes the method of the invention have relatively large deficiencies.

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