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Vol. 26 No. 24 (2014)

Copyright (c) 2014 Qingsong Yang, Qianwen Kuang, Yanbo Zhou, Jun Lu*

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Combined Air Oxidation and Activated Sludge Process for the Treatment of Refinery Spent Caustics

https://doi.org/10.14233/ajchem.2014.17550
Qingsong Yang
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, P.R. China *Corresponding author: Fax: +86 21 64252737; Tel.: +86 21 64252058; E-mail: lujun@ecust.edu.cn; hdlgzhr@163.com
Qianwen Kuang
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, P.R. China *Corresponding author: Fax: +86 21 64252737; Tel.: +86 21 64252058; E-mail: lujun@ecust.edu.cn; hdlgzhr@163.com
Yanbo Zhou
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, P.R. China *Corresponding author: Fax: +86 21 64252737; Tel.: +86 21 64252058; E-mail: lujun@ecust.edu.cn; hdlgzhr@163.com
Jun Lu*
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, P.R. China *Corresponding author: Fax: +86 21 64252737; Tel.: +86 21 64252058; E-mail: lujun@ecust.edu.cn; hdlgzhr@163.com

Corresponding Author(s) : Qingsong Yang

Asian Journal of Chemistry, Vol. 26 No. 24 (2014)

Abstract

Liquid hydrocarbon spent caustics generated in the oil refining process of a refinery contained a high concentration of toxic materials and refractory organic wastewater. In this study, the spent caustics were detoxified with a combination of air oxidation and biological treatment processes, as opposed to the direct biological treatment method. Further, the combined processes enabled the conversion of sulfate up to 95.5 % when the total sulfur load was 1.5 kgS/ (m3 d). The study indicated that the detoxification of sulfides to thiosulfates in the oxidation process enabled successful biological treatment and the combined air oxidation and biological treatment processes can effectively improve the oxidation rate of conversion, thereby reducing elemental sulfur generation rate. Furthermore, the combined processes can effectively shorten reaction time, thus increasing reaction load.

Keywords

Spent caustic Air oxidation Biological treatment Sulfide Sulfate Sequencing batch reactor.
Yang, Q., Kuang, Q., Zhou, Y., & Lu*, J. (2014). Combined Air Oxidation and Activated Sludge Process for the Treatment of Refinery Spent Caustics. Asian Journal of Chemistry, 26(24), 8375–8379. https://doi.org/10.14233/ajchem.2014.17550
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