In situ soil mixing was the delivery tool for lime activated Klozur® persulfate for the in situ chemical oxidation of chlorobenzene contamination.
The impacted area at the former chemical site included hotspots of elevated chlorobenzene (MCB), all isomers of dichlorobenzene (DCB), trichlorethene (TCE) and Tetrachloroethene (PCE), which when combined totaled just over .7 hectares. In situ chemical oxidation was chosen for treatment advantages in cost, timeframe and performance. In particular, a key receptor at risk was a non-tidal ditch that formed the northern boundary of the site.
Baseline mass balance calculations estimated that approximately 17,400 kg of contamination was partitioned in soil and NAPL, with a further 210 kg in groundwater. Calculations completed post remediation indicated that 11,715 kg of contamination was destroyed in situ as part of the process. Application of ISCO prevented approximately 48,400 tonnes of contaminated soil from being sent to landfill.