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Oily sludge advanced treatment technology

A kind of advanced treatment and process technology, applied in water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, water/sewage multi-stage treatment, etc. Complex, unfavorable practical application and other problems, to achieve the effect of good demulsification effect, wide application range and easy industrial application

Active Publication Date: 2015-05-27
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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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

Method used

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Embodiment 1

[0034] The concrete embodiment of the present invention is illustrated by taking the oil sludge at the bottom of a refinery as an example. The analysis of the oily sludge content of the feed is shown in Table 1. The weight percentage of each component of the demulsifier is: disodium fatty alcohol polyoxyethylene ether sulfosuccinate monoester (R=C 18 ) 18wt%, potassium lauryl ether phosphate (chemical formula: RO(CH 2 CH 2 O) n -PO(OK) 2 , R=C 14 , n=9) 15wt%, styrene 1wt%, oxalic acid 0.6wt%, water 65.4wt%. The dosage of demulsifier is 3% of the sludge weight. The mixing time of the demulsifier in the sludge mixing tank is 30 minutes, and the temperature of the mixing tank is controlled at about 65°C. Using the process of the present invention to treat oily sludge, the water content of the discharged mud cake is reduced to 50.3%-53.8%, and the oil content is 17.0%-21.4%, as shown in Table 2. Through material balance calculation, the volume of sludge after dehydration t...

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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...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F9/02C02F1/40C10G1/00
CPCC02F1/40C02F9/00C02F11/12C02F11/14C02F2101/32C02F2303/06C10G1/00C10G2300/1003
Inventor 杨飞飞回军李宝忠吴巍
Owner CHINA PETROLEUM & CHEM CORP
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