Potassium permanganate oxidation of low-permeability phenanthrene contaminated soil under fracturing conditions

• Published in: IOP conference series. Earth and environmental science 2024-05, Vol.1335 (1), p.12027
• Main Authors: Shi, Fu-Jiang, Feng, Shi-Jin
• Format: Article
• Language: English
• Subjects: Aromatic hydrocarbons; Cation exchange; Cation exchanging; Dissolved organic carbon; Hydraulic fracturing; Organic soils; Oxidants; Oxidation; Oxidation tests; Oxidation-reduction potential; Oxidizing agents; Oxygen demand; Permeability; Phenanthrene; Physicochemical properties; Polycyclic aromatic hydrocarbons; Potassium; Potassium permanganate; Redox potential; Remediation; Soil chemistry; Soil contamination; Soil penetration tests; Soil permeability; Soil pollution; Soil properties; Soil remediation; Soil testing; Soils; Total organic carbon; Total oxygen demand
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/1335/1/012027

In situ chemical oxidation (ISCO) technology has limitations in the remediation of low-permeability polycyclic aromatic hydrocarbon (PAHs)-contaminated sites because of the difficulty in oxidant delivery. Horizontal fractures created by hydraulic fracturing provide convenient channels for rapid oxidant delivery. However, limited studies have focused on potassium permanganate (KMnO 4 ) oxidation in low-permeability PAH-contaminated sites under fracturing conditions considering in situ hydrological environments. Therefore, this study aimed to explore the effect of KMnO 4 concentration on the remediation efficiency (including the removal rate of phenanthrene (PHE), remediation time, and total oxygen demand (TOD)) of low-permeability PHE-contaminated soil through a one-dimensional penetration-oxidation test, and the effect of KMnO 4 oxidation on the physicochemical properties of the soil through a series of laboratory experiments. The results showed that an increase in KMnO 4 concentration shortened the remediation time and increased the removal rate of PHE and TOD from PHE-contaminated soil. The oxidation of KMnO 4 resulted in an increase in the pH, oxidation-reduction potential, dissolved organic carbon, cation exchange capacity, specific surface area, and fine particle content of the soil, and a decrease in the total organic carbon of the soil, but did not alter the permeability of the soil.