Abstract
A re-circulated flow-through photoreactor was used to evaluate the ultraviolet (UV) photolysis and UV/H 2O 2 oxidation process in the purification of three different water matrices. Chemically coagulated and electrocoagulated surface water, groundwater contaminated with creosote wood preservative and 1,2-dichloroethane (DCE) containing washing water from the plant manufacturing tailor-made ion-exchange resins were used as sample waters. The organic constituents of creosote consist mainly of harmful polycyclic aromatic hydrocarbons (PAH) whereas 1,2-DCE is a toxic volatile organic compound (VOC). Besides analyzing the specific target compounds, total organic carbon (TOC) analysis and measurement of change in UV absorbance at 254 nm (UV 254) were performed. Initial TOC, UV 254 and pH varied significantly among treated waters. Initial H 2O 2 concentrations 0–200 mg/l were used. The UV/H 2O 2 treatment was efficient in removing the hazardous target pollutants (PAHs and 1,2-DCE) and natural organic matter (NOM). In addition, high removal efficiency for TOC was achieved for coagulated waters and groundwater. Also, the efficiency of direct photolysis in UV 254 removal was significant except in the treatment of 1,2-DCE containing washing water. Overall, UV 254 and TOC removal rates were high, except in case of washing water, and the target pollutants were efficiently decomposed with the UV/H 2O 2 method.
Published Version
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