Journal of Environmental Engineering Technology ›› 2019, Vol. 9 ›› Issue (3): 294-301.doi: 10.12153/j.issn.1674-991X.2019.01.120

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Experimental study on treatment of high-oil sludge containing polymer by thermochemical cleaning and countercurrent extraction

CHEN Hongshuo,LIU Jiaju,FU Zhenghui,GUO Huaicheng()   

  1. College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • Received:2018-11-04 Online:2019-05-20 Published:2019-05-20
  • Contact: Huaicheng GUO E-mail:ghc1111@pku.edu.cn

Abstract:

In order to meet the demand of resource utilization and harmless treatment of high-oil sludge containing polymer, a comprehensive treatment process with “thermochemical cleaning and countercurrent extraction” as the core was developed. The removal of crude oil from high-oil sludge containing polymer of one marine drilling platform by thermochemical cleaning and countercurrent extraction was studied experimentally. A domestic brand of washing powder was used as cleaning agent during the thermochemical cleaning. Results showed that the optimum conditions for thermochemical cleaning was temperature of 65 ℃, the liquid-to-solid mass ratio of 3:1, the cleaning time of 25 min, and the stirring rate of 450 r/min. After thermochemical treatment, the dry base oil content of oil sludge decreased from 62.0% to 25.4%, and the removal rate could reach 59.0%; moreover, the oil sludge after treatment showed good dispersion in the subsequent countercurrent extraction process. The dry base oil content of solid after “thermochemical cleaning and countercurrent extraction” was 1.7%, which perfectly met the control standards of Technical Requirements for Comprehensive Utilization and Pollution Control of Oil-bearing Sludge in Oil and Natural Gas Exploitation (SY/T 7301-2016), and the mineral oil could be delivered to the refinery for recycling.

Key words: high-oil sludge containing polymer, thermochemical cleaning, countercurrent extraction, washing powder, extracting agent

CLC Number: 

  • X741