Oily sludge advanced treatment technology

Abstract

The invention discloses an oily sludge advanced treatment technology which comprises the following contents: oily sludge in a raw material storage sludge-tank enters a sludge mixing tank; a demulsifier is added to carry out demulsification treatment; demulsified oily sludge enters screw-type sludge dewatering equipment to undergo solid-liquid separation so as to obtain a filtrate and sludge cake; the filtrate enters a two-phase cyclone to be separated; after two-phase separation, excess sludge at the lower layer flows back to the raw material storage sludge-tank, a mixed liquor at the upper layer is sent into a gas-liquid mixing tank to be mixed with the air and then enters a separation pond to carry out primary separation of sump oil and sewage; sump oil is recovered to a sump oil tank by the use of a sludge scraper; sewage enters a filter to separate suspended particles and residual sump oil in the sewage from water; sump oil separated from the top of the filter is recovered to a sump oil recovery tank; and sewage discharged from the filter is sent to a sewage treatment plant to undergo subsequent processing. By the technology, water content of the oily sludge can be reduced from 80-98% to about 50%, and most crude oil in the oily sludge can be recovered. Thus, sludge subsequent processing difficulty is greatly reduced. The technology provided by the invention has a wide range of application, is especially suitable for processing of oily sludge at the bottom of an oil-tank, dross and activated sludge as well as processing of various oily sludge generated from oil exploitation and storage transportation enterprises.

Description

technical field [0001] The invention relates to an advanced treatment process of oily sludge, in particular to a treatment process for sludge dehydration and crude oil recovery 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 collo...

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

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