A treatment process for oily sludge

Abstract

The invention discloses a process for treating oily sludge, which includes the following contents: the oily sludge in a raw material storage sludge tank is put into a sludge mixing tank, and a demulsifier is added for demulsification treatment, and the oily sludge after demulsification Enter the screw-stacked sludge dewatering machine for solid-liquid separation to obtain filtrate and mud cake. The filtrate enters the settling tank for sedimentation and separation, recovers the dirty oil from the top of the settling tank, and sends the sludge at the bottom of the settling tank back to the raw material storage sludge tank , the mixed liquid in the middle layer is passed into the gas-liquid mixing tank to mix with air, the mixture enters the separation tank for oil-water separation, the separated dirty oil is recovered, and the sewage enters the biochemical device for treatment and then discharges up to the standard. This process can not only effectively realize the oil-cement three-phase separation and treatment of oily sludge, but also recover most of the crude oil in the oily sludge, and the treated sewage can be discharged up to the standard.

Description

technical field [0001] The invention relates to a process for treating oily sludge, in particular to a process for reducing, recycling and harmless treatment of oily sludge. Background technique [0002] A large amount of black solid and semi-solid waste containing oil will be produced in the process of oil exploitation, gathering and transportation, refining and oily sewage treatment, which is called oil sludge, and its main components are crude oil, mud and water. The size of solid particles in oil sludge can range from less than microns to several inches, most of which are between 1 and 100 microns. The composition of oil depends on the type of crude oil, refinery structure and operating conditions. The composition of sludge may change over time. According to statistics, China's annual output of oil sludge is nearly 3 million tons, which contains about 600,000 tons of crude oil resources. In addition to a large amount of aged crude oil, waxy, and colloidal substances, th...

AI Technical Summary

Problems solved by technology

The process is relatively complicated, and the oil recovery rate needs to be improved

CN102092907A discloses a method for resourceful treatment of oily sludge. First, the emulsified water rich in sludge is removed by electrochemical methods, so that the sewage can meet the requirements of reinjection. After the treatment by this method, the water content of the oily sludge is reduced to less than 1% , in recovering a large amount of aged crude oil from the oily sludge, the aged oil contained in the oily sludge is reduced to less than 1% after being treated by this method, and finally the oily sludge is organically treated, and the oily sludge is organically treated by microbial fermentation , to achieve harmless discharge, and the final waste oil content is less than 3%, but the process is complicated to operate and high in cost, which is not conducive to practical application

CN102041038A discloses a treatment method for heavy oil aging oil, which solves the problem of demulsification and dehydration of heavy oil aging oil in the oilfield by using a demulsifier combined with centrifugation to treat the aging oil, but the three-phase decanter centrifuge used in the invention The cost of the machine is high, and the treatment effect on impurities lighter than water such as foam in sewage is relatively poor, which is not conducive to the treatment of sludge with high oil content

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