Abstract
Chlorinated aliphatic hydrocarbons (CAHs) are amongst concerning contaminants with high detection in aquifers and soils. This work is focused on removal of tetrachloroethylene and its degradation products through a two-step process including a permeable ZVI column followed by UV/Fe/PDS process. The permeable ZVI column experiments were designed using response surface method with central composite design. Optimum condition of the permeable ZVI column was initial solution pH = 5, 2 mL/min flow and 26 cm column height which brought about 96% dechlorination efficiency. Total iron leach in the column effluent was 0.34 mg/L. The concentrations of CAHs in permeable ZVI column’s effluent were as follows: PCE ≤ 0.08 mg/L, TCE = 0.23 mg/L, cis-1,2-DCE = 0.36 mg/L, VC = 0.34 mg/L. Thus, further treatment step was required to comply with the corresponded standards. Regarding iron leach, a PDS-based advanced oxidation process was applied on the ZVI column’s effluent with focus on cumulative removal of CAHs. Complete removal of CAHs and 79.2% TOC removal were obtained at pH = 6 using 0.75 mM PDS, 6 W UV at 15 min reaction time. In UV/Fe/PDS process, synergy effect of 67% was observed.
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