Evaluation of a field-scale UV/H2O2-oxidation system for the purification of groundwater contaminated with PCE

A field-scale demonstration using UV/H2O2 was conducted in order to evaluate its effectiveness for the treatment of groundwater contaminated with tetrachloroethylene (PCE). The system was efficient in removing PCE in low-alkalinity groundwater containing moderate levels of the contaminant and within feasible operating costs. Low concentrations of chloroacetic acids were detected in the reactor effluent; however, the levels of both PCE and byproducts were clearly acceptable according to the drinking water criteria. Economic cost analysis showed UV/H2O2 to be on the same level as carbon adsorption. The operating costs attributed to electrical energy and hydrogen peroxide depended on the purification level chosen as target, but were only a minor component of the total purification costs.