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Treatment method of oil-containing sludge

A treatment method and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, dewatering/demulsification by chemical methods, etc., to achieve the effects of good dewatering effect, strong flocculation and agglomeration ability, and low operating cost

Inactive Publication Date: 2018-07-24
YANGZHOU DAYANG WATER SUPPLY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there is still a lack of an effective resource recovery of useful substances in oily sludge, separation or drying of residual water in oily sludge, and non-toxic treatment of pollutants in oily sludge. Hazardous Disposal Methods

Method used

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  • Treatment method of oil-containing sludge
  • Treatment method of oil-containing sludge
  • Treatment method of oil-containing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]The oily sludge produced in the sewage treatment plant of the oil refinery mainly comes from the bottom sludge of the grease trap, the scum of the flotation tank, and the bottom sludge of the crude oil tank. The composition of these oily sludge is different, and the oil content is usually 10 % to 50%, the water content is between 40% and 90%, accompanied by a certain amount of solids; the selected demulsifiers are polyethylene polyamine block polyether demulsifiers, silicon-containing demulsifiers, and phenolic resin demulsifiers , polyphosphate demulsifier and polyaluminum chloride demulsifier; first, the oily sludge is passed into the separation tank for preliminary oil, water and slag separation; the separated waste oil is recovered, and the remaining mud and water mixture Drain to the demulsification tank, add demulsifier, add sulfuric acid, adjust the pH value to 2.5, and demulsify; Among them, polyethylene polyamine block polyether demulsifier, silicon-containing de...

Embodiment 2

[0046] For the oily sludge produced by crude oil extraction, this oily sludge generally has the characteristics of high oil content, high viscosity, fine particles, and difficult dehydration. The selected demulsifiers include silicon-containing demulsifiers, phenolic resin demulsifiers, and polyphosphate demulsifiers. Emulsions and polyaluminum chloride demulsifiers. First, the oily sludge is passed into the separation tank for preliminary separation of oil, water and slag; the separated waste oil is recovered, and the remaining mixture of mud and water is discharged to the demulsification tank, where demulsifier is added, and then sulfuric acid is added to adjust The pH value is 3.0, and demulsification is carried out; wherein, the mass ratio of silicon-containing demulsifier, phenolic resin demulsifier, polyphosphate demulsifier and polyaluminum chloride demulsifier is 1:1:3:2, and the demulsifier addition is The sludge weight is 1‰, the reaction temperature is 65°C, and the...

Embodiment 3

[0049] For the oily sludge produced in the oilfield gathering and transportation process, this oil contains mechanical impurities, sand, soil, heavy metal salts, and heavy oily components such as paraffin and asphaltene, which are deposited on the bottom of the oil tank to form sludge at the bottom of the tank. Select Typical demulsifiers include phenolic resin demulsifiers, alkylphenol polyoxyethylene ethers, polyphosphate demulsifiers and polyaluminum chloride demulsifiers. First, the oily sludge is passed into the separation tank for preliminary separation of oil, water and slag; the separated waste oil is recovered, and the remaining mixture of mud and water is discharged to the demulsification tank, where demulsifier is added, and then nitric acid is added to adjust The pH value is 1.5, and demulsification is carried out; wherein, the mass ratio of phenolic resin demulsifier, alkylphenol polyoxyethylene ether, polyphosphate demulsifier and polyaluminum chloride demulsifier...

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Abstract

The invention discloses a treatment method of oil-containing sludge and belongs to the field of environmental engineering. The treatment method comprises the following steps of: introducing the oil-containing sludge into a separating groove, discharging into a deemulsifying groove for deemulsification after initially separating, and carrying out oil-water-sludge separation on deemulsified productsin an oil-sludge separating device; recovering dirt oil at the upper part, settling sludge-water mixture at the lower part, recovering clear liquor, and carrying out coagulation treatment, settling separation, mechanical dewatering, sludge drying and sludge incineration treatment in sequence on the sludge-water mixture at the bottom part and residual active sludge. Composite deemulsifying agentspreferred by the invention include a polyethylene polyamine blocked polyether deemulsifying agent, a silicon-containing deemulsifying agent, a phenolic-resin deemulsifying agent, an alkylphenol polyoxyethylene ether deemulsifying agent, a polyphosphoester deemulsifying agent or a polyaluminium-chloride deemulsifying agent. The deemulsifying method disclosed by the invention has the beneficial effects that the safe and environment-friendly effects are achieved, the water content of oil sludge can be reduced, most crude oil in the oil sludge can be recovered, and the difficulty of the followingtreatment of the sludge can be reduced.

Description

technical field [0001] The invention relates to a method for treating oily sludge, in particular to a method for safely and environmentally friendly treating bottom sludge, scum and remaining activated sludge produced by a biochemical treatment unit, and belongs to the field of environmental engineering. Background technique [0002] As the world's demand for oil and minerals continues to increase, soaring oil and mineral prices have stimulated countries with oil resources to develop new resources and new technologies. A large amount of oily waste will be produced in the process of oil mining, transportation, refining and oily sewage treatment. Solid waste - oily sludge. Oily sludge includes bottom sludge, scum and remaining activated sludge produced by biochemical treatment units; the general oil content in sludge is 10% to 50%, and the water content is 40% to 90%. According to statistics, in my country's petrochemical industry, Daqing Oilfield produces nearly 1.43×10 oily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C10G33/04
CPCC02F11/12C02F11/14C10G33/04
Inventor 吴祥昌孙锋董安成刘富强刘玉贵
Owner YANGZHOU DAYANG WATER SUPPLY EQUIP
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