Oil extraction device and process for treatment of sick and dead animal wastewater by wet method

Abstract

The invention relates to an extraction device and an extraction process for wet-process treatment of waste water fat from animals dead of diseases. The device comprises a regulating tank, a solid-liquid separating system, a heating system and an oil-water separating system, wherein the solid-liquid separating system consists of a vibrating screen, a horizontal screw centrifuge, conveying pumps, a tank body for receiving screening liquid, a tank body for receiving screening residues, a tank body for receiving residues from the horizontal screw centrifuge and a tank body for receiving liquid from the horizontal screw centrifuge; the heating system consists of a steam distributing cylinder, a heating tank and a hot water tank; the oil-water separating system consists of a two-phase separator, a three-phase separator, an oil storage sump, a gear pump, an oil storage tank, a tank body for receiving water and residues from the three-phase separator, a tank body for receiving water and residues from the two-phase separator and a waste water collecting pool. According to the process provided by the invention, by using the screening of the vibrating screen, the treatment of the horizontal screw centrifuge, two-phase separation and the three-phase separation, solid residues, oil and water in the treatment waste water of the animals dead of diseases can be better separated; the extraction device and the extraction process can be applied to the field of animal harmless treatment.

Description

technical field [0001] The invention belongs to the technical field of separation and treatment of oil and water in sewage, and in particular relates to an extraction device and process for treating waste water by wet treatment of sick and dead animals and separating suspended matter in waste water. Background technique [0002] With the vigorous development of sewage treatment, the research on oil-water separation in sewage treatment is also being rationalized and refined more deeply. At present, there are many studies on the treatment of suspended solids in wastewater, mainly for the fields of catering, urban sewage, industrial sewage, etc. The treatment technology for the treatment of suspended solids in wastewater by the wet method of sick and dead animals is not yet clear and the water content in oil is required to be below 5%. , the oil content in water is below 1%, the difficulty of its treatment can be imagined. [0003] The oil-water separation methods at home and ...

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Problems solved by technology

[0003] The oil-water separation methods at home and abroad, such as coarse filtration, filtration and membrane separation, are easy to cause clogging, and the on-site operation is difficult; methods such as air flotation, adsorption and coagulation need to invest a large amount of chemicals; the cost of activated sludge, biological filter and ultrasonic is too high. High, only a small amount of oily water treatment is used; for the treatment of oily water in oil refining, coking, steel and other industries, because of its large processing capacity and high oil concentration, the old three sets of technological processes are generally used, namely gravity separation-flotation-biochemical Treatment and other multi-stage treatment processes, but the investment is huge, the land occupation is large, the operation flexibility is small, the oil resources are difficult to recover, and it is easy to cause secondary pollution

At present, the shortcomings of the treatment technology for the treatment of suspended solids in wastewater by wet treatment of sick and dead animals are: (1) the site space layout of the entire process flow is not beautiful; Small but heavy workload; (3) The coupling degree of each module in the process flow is high, and all of them are indispensable. If there is a failure, it is easy to cause the whole to fail to operate normally; (4) The cost is high, and it is difficult to popularize

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