Offshore platform sewage treatment method

Abstract

The invention discloses an offshore platform sewage treatment method, which organically couples a mechanical steam recompression concentration technique, a supercritical water oxidization technique and a reverse osmosis filter technique. The method comprises the following steps that (A) offshore platform sewage is subjected to oil removal by an oil removal groove and is concentrated by a mechanical steam recompression evaporation device; (B) after being mixed, concentrated water and oil contents enter a supercritical water oxidization device for efficient treatment; (C) condensed water condensed by a concentration device and outlet water after treatment of the supercritical water oxidization device are mixed and then generate reuse purified water after being filtered by active carbon and a reverse osmosis device; (D) heat generated by the supercritical water oxidization device is respectively used for evaporation concentration and production life; (E) purified water generated by the reverse osmosis device is used for steam and production life reuse; (F) adsorption saturation active carbon is regenerated after being treated by the supercritical water oxidization device. The method has the advantages that efficient organic pollutant treatment and disposition are integrated; meanwhile, the efficient degradation and resource utilization of the offshore platform sewage are realized.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating sewage on an offshore platform. Background technique [0002] Offshore platform sewage treatment includes production sewage and domestic sewage, among which production sewage is oily sewage, which comes from formation associated water produced during oil and gas production. Separation of associated water and oil and gas, from which qualified oil and gas products can be obtained, resulting in a certain amount of crude oil and other impurities in the separated associated water, which is oily sewage. The oily sewage contains dispersed oil, emulsified oil, dissolved oil and bacteria, which can pollute the marine environment and lead to the death of marine organisms. At present, the treatment methods for this kind of production wastewater are mainly inclined plate oil removal, air flotation and filter. Filtration will cause secondary pollution and the treatme...

AI Technical Summary

Problems solved by technology

At present, the treatment methods for this kind of production wastewater are mainly inclined plate oil removal, air flotation and filter. Filtration will cause secondary pollution and the treatment effect is unstable.

[0003] The domestic sewage on the platform mainly includes two types, one is the drainage from toilets, urinals and infirmaries, which is called "black water". Due to the flushing of sea water and the regular addition of toilet cleaners, black water contains a large amount of chloride ions, Disinfectants, etc., are difficult to deal with; one is daily bathing sewage, ground flushing water, and drainage from kitchens and laundry rooms, which is called "grey water". Gray water contains a lot of chemical substances such as surfactants and detergents, which also increases Handling Difficulty

The treatment methods of domestic sewage include biological method and electrolysis method, but they all have the disadvantages of poor resistance to hydraulic load and easy to produce secondary pollution.

[0004] In short, the current sewage treatment on offshore platforms has limitations, and the treated COD is difficult to meet the requirements of the first-level standard limit value of "Pollutant Discharge Concentration Limits for Offshore Oil Exploration and Development" (GB4919-2008)

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