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An integrated approach to remove PAHs from highly contaminated soil; electro-fenton process and bioslurry treatment

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doi: 10.1007/s11270-020-04696-7
Authors:Liu Zhanmeng; Gao Zhimin; Lu Xiuguo
Author Affiliations:Primary:
Nanchang Institute of Technology, School of Civil and Architecture Engineering, Nanchang, China
Other:
East China JiaoTong University, School of Civil Engineering and Architecture, Nanchang, China
Volume Title:Water, Air and Soil Pollution
Source:Water, Air and Soil Pollution, 231(6). Publisher: Springer, Dordrecht, Netherlands. ISSN: 0049-6979
Publication Date:2020
Note:In English. 17 refs.; illus.
Summary:A combined process comprised of electro-Fenton and bioslurry (EF-bioslurry) was developed at lab scale for remediating a real coking plant soil with an initial polycyclic aromatic hydrocarbons (PAHs) content of 3605 mg/kg. Sodium citrate was used as a complexant to keep the iron in solution at near-neutral pH conditions for increasing the reaction rate. The appropriate order of application was to perform EF process followed by bioslurry, which was evaluated through analysis of degradation characteristics of individual processes. The optimum EF duration was assessed through an analysis of the induced changes in PAHs degradation and bacterial counts. The optimum application time of EF process was determined to be 24 h. The removal of PAHs was 95.2% for EF-bioslurry after 40 days, and the efficiency was increased by almost 150%, compared with the individual bioslurry treatment. The EF reaction caused significant cell death and high inhibition to polyphenol oxidase (PPO) activity of soil. The bacterial activity and counts in the slurry recovered rapidly after EF oxidation through the addition of raw soil (2%, w/w). Therefore, the combined process of EF-bioslurry process may be an efficient and promising approach for the remediation of highly organic-contaminated soil.
Subjects:Aromatic hydrocarbons; Biodegradation; Decontamination; Hydrocarbons; Organic compounds; PH; Pollution; Polycyclic aromatic hydrocarbons; Reclamation; Remediation; Slurries; Soil pollution; Soil treatment; Soils; Bacteria
Record ID:884531-60
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany
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