US 11,629,084 B2Granted

Method for treating an oily solid waste sludge

AssigneeChina University of Petroleum Blue Sky(Qingdao) Petroleum Technology Co., Ltd

InventorsWeizhong Wei, Zhe Bai, Xinran Li, Haotian Gong, Rongguang Wu, Chuansheng Jia, Biao Yang, Deliang Liu, Zhenhua Sun

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Abstract

The present disclosure provides a solid waste treatment method, including following steps: screening off masses having a particle size greater than 0.5 cm from solid waste; adding extraction agents to the solid waste and then heating and stirring so that the solid waste is fully dispersed in the extraction agents; placing the mixed extraction agent in a centrifuge and centrifuging the mixed extraction feeding liquid phase separated by centrifuging into a rectification tower for rectification and cooling, recovering residual oil substances in a rectification kettle, separating mixture of cooled extraction agents and water, continuously adding the separated extraction agents into an extraction kettle for cyclic extraction, and conveying sewage to a sewage treatment plant to treat and discharging the sewage after the sewage reaches a treatment standard.

A method for treating an oily solid waste sludge, comprising the following steps:

(1) preparing screened solid waste by screening off masses having a particle size greater than 0.5 cm from the oily solid waste sludge;
(2)(a) preparing an extraction agent mixture consisting of a main extraction agent, a secondary extraction agent, and an auxiliary extraction agent wherein the main extraction agent is a distillate oil having a boiling range of 115-135° C., the secondary extraction agent is a distillate oil having a boiling range of 140-150° C., and the auxiliary extraction agent is a distillate oil having a boiling range of 80-100° C., then
(2)(b) combining the extraction agent mixture with the screened solid waste sludge and then heating the resulting combination to 30-45° C. and stirring for 20-35 minutes forming a mixed extraction comprising the screened solid waste fully dispersed in the extraction agents;
(3) placing the mixed extraction of step (2)(b) in a centrifuge and centrifuging the mixed extraction thereby forming a less dense liquid fraction and a more dense solids fraction;
(4) feeding the liquid fraction into a rectification tower for rectification and cooling, recovering residual oil substances in a rectification kettle, separating extraction agents from a mixture of cooled extraction agents and water, continuously adding the separated extraction agents into an extraction kettle for cyclic extraction, and conveying sewage to a sewage treatment plant, treating the sewage in the sewage treatment plant, and discharging the treated sewage after the sewage reaches a treatment standard;
(5) adding a degrading bacterium agent, rice hull powder, urea, potassium dihydrogen phosphate and water into the solids fraction and fully mixing the solids fraction, the degrading bacterium agent, the rice hull powder, the urea, the potassium dihydrogen phosphate, and the water;
and
(6) covering the fully mixed product produced by step (5) with a geomembrane and reacting for 3-5 months.

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Abstract

Claims10