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Identification of persulfate oxidation products of polycyclic aromatic hydrocarbon during remediation of contaminated soil
Citation:
Liao, X., D. Zhao, X. Yan, AND S. Huling. Identification of persulfate oxidation products of polycyclic aromatic hydrocarbon during remediation of contaminated soil. JOURNAL OF HAZARDOUS MATERIALS. Elsevier Science Ltd, New York, NY, 276:26-34, (2014).
Impact/Purpose:
Submitted to Journal of Hazardous Materials.
Description:
The extent of PAH transformation, the formation and transformation of reaction byproducts during persulfate oxidation of polycyclic aromatic hydrocarbons (PAHs) in coking plant soil was investigated. Pre-oxidation analyses indicated that oxygen-containing PAHs (oxy-PAHs) existed in the soil. Oxy-PAHs including 1H-phenalen-1-one, 9H-fluoren-9-one, and 1,8-naphthalic anhydride were also produced during persulfate oxidation of PAHs. Concentration of 1,8-naphthalic anhydride at 4 h in thermally activated(50◦C) persulfate oxidation (TAPO) treatment increased 12.7 times relative to the oxidant-free control. Additionally, the oxy-PAHs originally present and those generated during oxidation can be oxidized by unactivated or thermally activated persulfate oxidation. For example, 9H-fluoren-9-one concentration decreased 99% at 4 h in TAPO treatment relative to the control. Thermally activated persulfate resulted in greater oxy-PAHs removal than unactivated persulfate. Overall, both unactivated and thermally activated persulfate oxidation of PAH-contaminated soil reduced PAH mass, and oxidized most of the reaction byproducts. Consequently, this treatment process could limit environmental risk related to the parent compound and associated reaction byproducts.
