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Combination of the direct electro-Fenton process and bioremediation for the treatment of pyrene-contaminated soil in a slurry reactor

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Frontiers of Environmental Science & Engineering 2015年第6期9卷 1096-1107页

作者： Wendi XU Shuhai GUO Gang LI Fengmei LI Bo WU Xinhong GAN Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of Sciences Beijing 100049 China

A combined treatment technology （DEF-BIO） using the direct electro-Fenton （DEF） process and bioremediation （BIO） was established in this study. The performance of the DEF-BIO process on the remediation of a pyrene （PYR）-contaminated soil was evaluated in a slurry reactor. The appropriate order of application was to conduct the DEF process followed by BIO, evaluated through analysis of the degradation characteristics of each process individually. In addition, the application time of the DEF process affected the efficiency of the combined process. The optimum time to apply the DEF process was determined through an analysis of the induced changes in PYR intermediates, pH, soil organic matter （SOM） and bacteria. The optimum application time of the DEF process was 6 h. All the induced changes were beneficial for the BIO phase. The removal of PYR was 91.02% for DEF- BIO after 72h, and the efficiency was almost 50% increased, compared with the individual DEF and BIO treatments. Therefore, the combined process of DEF-BIO process may be an efficient and promising method for the remediation.

关键词： direct electro-Fenton bioremediation slurryreactor combined process pyrene

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Kinetic study of hydrodesulfurization of coker gas oil in a slurry reactor

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 139-144页

作者： Haiding XIANG Tiefeng WANG Beijing Key Laboratory of Green Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 China

Coker gas oil （CGO） is a poor-quality feed- stock for ftuidized bed catalytic cracking （FCC） or hydrocracking. The pretreatment of CGO, especially hydrotreating, can significantly improve the product quality and protect the catalyst. In this work, we studied the hydrodesulfurization （HDS） of CGO in a slurry reactor. All the experiments were carried out in an autoclave using a NiMo/A1203 catalyst at reaction temperature 340℃- 400℃, pressure 6-10 MPa, and stirring speed 800 r. mn^-1, with hydrogen-to-oil ratio in the range of 500-1500. The effects of the operating parameters on the desulfurization ratio were investigated and discussed. A macro reaction kinetic model was established for the HDS of CGO in the slurry reactor.

关键词： coker gas oil hydrodesulfurization slurryreactor reaction kinetic model

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