Method for innocent treatment of bottom oil sludge, scruff and active sludge in petro-chemical industry

Abstract

The invention discloses a method of harmless treatment to residual activated sludge produced by bottom sludge, scum and biochemical treatment units in the petrochemical industry, which comprises: emulsion breaking to the bottom sludge and scum; separation of oil, water and mud of products after emulsion breaking; and recovery of dirty oil at the upper part and sedimentation of mud-water mixture at the lower part, recovery of clear liquor at the upper part, and treatment of coagulation conditioning, flocculation conditioning, sludge concentration, sludge dewatering, sludge drying and sludge incineration to mud-water mixture at the bottom part and the residual activated sludge sequentially. The method can effectively recycle useful oil substances and aluminum-containing compounds in the bottom sludge and scum, purify possibly released malodorous gases in mud produced in the process of storage and disposal, and carry out the treatment such as sludge conditioning, dewatering and drying sequentially to the residual mass hazardous wastes after the recycling treatment, then utilize the current boilers in enterprises to implement the direct incineration treatment. The method has advantages of simple operation and running, safety and reliability, complete resource recovery, controllable water removal, and maximally reducing the environmental pollution.

Description

technical field [0001] The present invention relates to a method for harmless treatment of industrial hazardous waste, in particular to a method for harmless treatment of three hazardous wastes in the petrochemical industry (i.e. "three muds": bottom sludge, scum and biochemical treatment unit produced The method of residual activated sludge) belongs to the field of environmental engineering. Background technique [0002] The so-called "three muds" refer to the oil sludge at the bottom of the pool or tank (hereinafter referred to as "bottom oil sludge") produced by the adjustment of the sewage treatment system in the petrochemical industry and the oil separation unit (hereinafter referred to as "bottom oil sludge"), as well as the scum and biochemical treatment produced by the flotation unit. The remaining activated sludge produced by the unit. Since the "three muds" in the petrochemical industry have been listed as hazardous waste by the state, they should be treated in a ...

AI Technical Summary

Problems solved by technology

[0007] At present, the treatment of the three sludges is still in the traditional stage of simple sedimentation and concentration and centrifugation with unsatisfactory effects.

Because the water content and oil content of the solid phase discharged by centrifugation are high, it is a viscous colloid, so it is inconvenient to transport, inconvenient to incinerate directly (the water content is high, resulting in high energy consumption), and it is also inconvenient to carry out drying treatment. (The oil content is high, so there are flammable and explosive safety hazards)

It can be seen that there is still a lack of effective resource recovery of useful substances in the three muds, separation or drying of residual water in the three muds, and harmless disposal of pollutants in the three muds. Methods

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