Integration of in-situ chemical oxidation and permeable reactive barrier for the removal of chlorophenols by copper oxide activated peroxydisulfate
Journal
Journal of Hazardous Materials
Journal Volume
432
Date Issued
2022
Author(s)
Abstract
In-situ chemical oxidation (ISCO) and permeable reactive barrier (PRB) have been used in field practices for contaminated groundwater remediation. In this lab-scale study, a novel system integrating ISCO and PRB using peroxydisulfate (PDS) as the oxidant and copper oxide (CuO) as the reactive barrier material was developed for the removal of 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP). The influences of chlorophenol concentration and flow rate on the system performance were first evaluated using synthetic solutions. The removal efficiencies of target chlorophenols were greater than 90% when sufficient PDS was supplied ([PDS]/[chlorophenol]>1). It was also found that the removal efficiencies decreased with the increasing chlorophenol concentrations (10–150 μM) and flow rates (1.8–14.4 mL/min). When three real groundwaters were employed, the removal efficiencies of 2,4-DCP and 2,4,6-TCP slightly reduced to 90% and 85%, respectively. For PCP, the removal efficiency dropped to 20% in two groundwaters with relatively high levels of alkalinity. The influences of pH and TOC were found to be insignificant for the range investigated (pH 6.5–8.7 and TOC = 0.4–1.5 mgC/L). The reduced removal efficiency could be due to the formation of weaker radicals and the stronger competition between bicarbonate ions and PDS for the activation sites on the CuO surfaces. © 2022 Elsevier B.V.
Subjects
Chlorophenols; CuO; In-situ chemical oxidation; Permeable reactive barrier; Peroxydisulfate
SDGs
Other Subjects
Alkalinity; Copper oxides; Efficiency; Groundwater; Groundwater pollution; Indium compounds; Oxidation; Remediation; Chlorophenols; Contaminated groundwater; Dichlorophenols; Ground water remediation; In-field; In-situ chemical oxidations; Permeable reactive barriers; Peroxydisulfate; Removal efficiencies; Phenols; 2,4 dichlorophenol; 2,4,6 trichlorophenol; chlorophenol; copper oxide; pentachlorophenol; chlorophenol; in situ measurement; oxidant; oxidation; oxide; PCP; pollutant removal; reactive barrier; alkalinity; Article; flow rate; nonhuman; oxidation; waste component removal; water treatment
Type
journal article