Method for gradient extraction treatment of oily sludge

An oil sludge and extraction technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of unspecified oil content and high oil content of oil sludge, and achieve high cost-effective disposal costs. , good effect, high efficiency effect

Pending Publication Date: 2022-05-06
JIANGSU DDBS ENVIRONMENT REMEDIATION
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  • Description
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Problems solved by technology

[0005] Although the technology in the above two patent documents can carry out harmless treatment of oil sludge, shorten the extraction time, and increase the extraction rate, the oil content in the oil sludge after the treatment of the first patent document is still high, and further harmless treatment is required. Chemical disposal; the second patent document does not specify the oil content of sludge after supercritical extraction, whether it meets the requirements for mineral oil content in sludge in the "Agricultural Sludge Pollutant Control Standard" (GB4284-2018)

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  • Method for gradient extraction treatment of oily sludge
  • Method for gradient extraction treatment of oily sludge
  • Method for gradient extraction treatment of oily sludge

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specific Embodiment 1

[0037] The specific embodiment of the present invention is described by taking the oil sludge of a refinery as an example. Oil sludge contains 12.3% oil, 38% water, and the rest is solid matter.

[0038]Weigh 4-5kg of water and 0.5kg of sludge separating agent, put them in a blender, heat to 80°C, stir until the sludge separating agent is completely dissolved, weigh 10kg of the above sludge, remove large particles and foreign matter, and add it to the stirrer , Stir at 60°C for 25 minutes, add 50g of demulsifier, stir and stand still to separate oil, mud, and water. The separated oil enters the oil layer storage tank, and the water enters the primary and secondary emulsification-extraction recycling. Add 0.25kg of oil sludge separating agent to the mud, input it into the sludge cutting machine for high-speed cutting, and then enter the homogenizer with 5kg of water, homogenize at 70°C for 15 minutes, then add 50g of demulsifier, and enter the three-phase horizontal screw machi...

specific Embodiment 2

[0040] The specific embodiment of the present invention is illustrated by choosing the oily sludge from an oil field. Oil sludge contains 8.27% oil, 44% water, and the rest is solid matter.

[0041] After pre-removing the larger stones, branches and domestic garbage in the oil sludge, the treatment process, process parameters and the proportion of additives are the same as in Example 1. "After cascade extraction treatment, the mineral oil content in the sludge is 0.17%, the water content is 14.8%, and there is no obvious extractant smell. The total weight of the treated sludge is 6.3kg, and the weight of the treated sludge is reduced by 37%.

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Abstract

The invention discloses a method for cascade extraction treatment of oily sludge. The method comprises the following steps: step 1, carrying out primary emulsification-extraction on the oily sludge; step 2, carrying out secondary emulsification-extraction on the oily sludge subjected to primary emulsification-extraction; step 3, carrying out third-stage supercritical extraction on the oily sludge subjected to the second-stage emulsification-extraction; and 4, the oil layer is subjected to innocent treatment. The oil sludge is deeply extracted by adopting a combined extraction technology, the treated oil sludge can reach the Control Standard of Pollutants for Agricultural Sludge (GB4284-2018), the treatment effect is good, and meanwhile, the cost is low.

Description

technical field [0001] The invention relates to the technical field of safe disposal of oily sludge, and more specifically relates to a method for treating oily sludge through cascade emulsification-supercritical combined extraction. Background technique [0002] Oily sludge (referred to as oily sludge) is one of the three wastes produced in the process of petroleum development, transportation, storage, refining, and sewage treatment. Oily sludge is a solid hazardous waste rich in petroleum hydrocarbons, mainly composed of oil, sediment and water composition. According to the different ways of its generation, it can be divided into: landing sludge, tank bottom sludge and "refinery three sludge". Its characteristics mainly include: high oil content, large water content, large volume, most of the harmful components exceed the emission standards, complex components, and difficult treatment. The oil content in the sludge is 10-70%, and the water content is between 40-90%. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/123C02F11/127C10G1/04
CPCC02F11/00C10G1/04C02F11/127C02F11/123
Inventor 张情亚李康军周维龙高学振郭宝蔓洪鑫雷文杰
Owner JIANGSU DDBS ENVIRONMENT REMEDIATION
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