In-Situ Generation of Active Oxidants in Permeable Reactive Barriers
The in-situ chemical oxidation (ISCO) is an effective technology for the remediation of organic contaminated groundwater. However, the requirement of adding oxidants, e.g. persulfate or H2O2, externally obviously reduces the economical efficiency of the overall treatment process. The method of in-situ generation of oxidants can avoid the disadvantage of conventional ISCO. Herein, our study indicates that the active chlorine can be effectively produced in a permeable reactive barrier (PRB) reactor, i.e. PRB-type two-compartment electrochemical device under the electric field. COD, i.e. chemical oxygen demand, as an indicator of organic pollutants in water was degraded by the in-situ electrogenerated active chlorine through the electrolysis of NaCl solution. The amount of COD removed in the anode chamber was 104 mg/L after operating the two-compartment device at 7.0 V for 12 h under the given working conditions, and COD detected in the cathode chamber was near zero, meaning all COD is removable in effluent. The results show that the in-situ electrogeneration of oxidants technology can provide a promising option for the treatment of groundwater organic pollutants.
KeywordsIn-situ chemical oxidation Active chlorine Two-compartment electrochemical device
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