Treatment process for oily sludge

Abstract

The invention discloses a treatment process for oily sludge. The treatment process comprises the following steps: putting the oily sludge in a raw material storage sludge basin into a sludge mixing tank, adding an emulsion breaker for emulsion breaking, putting the oily sludge subjected to emulsion breaking into a stacked type sludge dewatering machine for solid-liquid separation to obtain filtrate and mud cakes, putting the filtrate into a settling tank for settling separation, recycling waste oil discharged from the top of the settling tank, conveying the sludge at the bottom of the settling tank into the raw material storage sludge basin, feeding middle-layer mixed liquid into an air-liquid mixing tank for mixing with air to obtain a mixture, enabling the mixture to enter a separation basin for oil-water separation, recycling separated waste oil, putting sewage into a biochemical device for treatment, and discharging the sewage after the sewage meets the standard. According to the process, three-phase separation and treatment on oil, water and sludge of the oily sludge can be effectively realized, and most raw oil in the oily sludge can be further recycled; after being treated, the sewage meeting the standard can be discharged.

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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