Closed oily sewage treatment system

Abstract

The invention relates to a closed oily sewage treatment system, which comprises a closed horizontal sewage lifting tank, a uniform adjustment oil removal tank, a sludge lifting tank, an air floatationtank and a dirty oil lifting tank, and the sewage lifting tank conveys collected sewage into the uniform adjustment oil removal tank; the treated sewage is sent into the air floatation tank by the uniform mixing oil removal tank, the collected dirty oil is sent into the dirty oil lifting tank, and the collected sludge is sent into the sludge lifting tank; sewage is pumped out from a water pumpingopening in the lower part of the uniform adjustment oil removal tank through a circulating pump and then is fed from a water inlet in the upper part to realize liquid level circulating water distribution. According to the invention, a set of complete and closed oily sewage lifting, homogenizing, adjusting and oil removing treatment solutions are adopted, so that air pollution is avoided, a continuous-stage oil gas release source is eradicated, and an explosion dangerous area is reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment in the petrochemical industry, in particular to a closed oily sewage treatment system. Background technique [0002] During the production, processing, storage and transportation of petrochemical enterprises, sewage containing oil, flammable, explosive and toxic media (hereinafter collectively referred to as oily sewage) widely exists. At present, the oily sewage collection, transmission, and oil removal treatment systems are mostly composed of sewage pools, lift pumps, homogenizing pools, regulating pools, grease traps, and air flotation. The cover plate is still not a closed system; the transmission process usually uses pump pressure transmission; the oil is removed by regulating tanks, grease traps and air flotation technology and equipment. This system is an open system, and a large number of pool facilities cannot be completely sealed, and oil and gas Hazardous environment such as pollution, ...

AI Technical Summary

Problems solved by technology

However, the existing grease traps have the following problems in sewage treatment: sludge deposits, easy to block, low-level sludge discharge requires a lower sludge tank, construction and discharge are difficult; The oil needs to be lower in the dirty oil pool, which is difficult to construct and discharge; the grease trap is a self-flowing fixed liquid level degreasing process, which is greatly affected by the fluctuation of water volume, its hydraulic state is unstable, and the degreasing effect is not good

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