Study on the deoiling of high oil content sludge in Liaohe oilfield by thermochemical cleaning
The high content oily sludge from Liaohe oilfield is treated by thermochemical cleaning.Through the screening and compounding of surfactants,the best ratio of high efficiency cleaning agent for oily sludge is obtained by orthogonal experiment,and the best experimental condition is explored.Under the conditions of washing temperature of 80℃,stirring time of 40 min,liquid-solid ratio of 3∶1,stirring speed of about160 r/min,with the cleaning agent whose total mass fraction of all components is 2.9%,after treatment,the oil rate of oily sludge dropped to 3.17%determined by solvent extraction-Gravimetric method,so the chemical cleaning method is very effective,because the crude oil being cleaned can be recycled,and cleaning is carried out with low ratio of liquid to solid,cleaning agent can be reused,so this method not only reduces the harm of sludge to the environment,and achieve both economic benefits and environmental protection.
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