Treatment process for oily sludge

A technology for treating sludge, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Unfavorable practical application and other problems, to achieve the effect of good demulsification characteristics, high surface activity, easy industrial application

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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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

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  • Treatment process for oily sludge
  • Treatment process for oily sludge
  • Treatment process for oily sludge

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Example Embodiment

[0035] Example 1

[0036] The specific embodiment of the present invention is illustrated by taking the sludge at the bottom of a tank in a refinery as an example. The oily sludge content analysis of the feed is shown in Table 1. The weight percentage of each component of the demulsifier is: polyoxyethylene rosin acid (n=5) 7wt%, disodium cocoic acid monoethanolamide sulfosuccinate ( R=C 12 ) 16wt%, formic acid 0.2wt%, water 76.8wt%. The dosage of demulsifier is 3% of the weight of sludge. Using the process of the present invention to treat oily sludge, the water content of the discharged sludge cake is reduced to 50.2%-52.3%, and the oil content is 18.2%-21.6%, as shown in Table 2. Through material balance, the volume of the sludge after dehydration treatment is reduced by at least 10 times, which greatly reduces the difficulty of subsequent sludge treatment. The chemical oxygen demand (COD) and suspended solids (SS) content in the filtrate are shown in Table 3. This reduce...

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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...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14
Inventor 杨飞飞回军李宝忠赵景霞
Owner CHINA PETROLEUM & CHEM CORP
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