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USING THE NATURAL BIODEGRADATION POTENTIAL OF SHALLOW SOILS FOR IN-SITU REMEDIATION OF DEEP VADOSE ZONE AND GROUNDWATER
Avishai, L., H. Siebner, O. Dahan, and Z. Ronen.
Journal of Hazardous Materials 324(Pt B):398-405(2017)
The capacity of topsoil to serve as a bioreactor for perchlorate degradation was investigated by infiltrating polluted groundwater under unsaturated conditions in column experiments designed to simulate typical remediation operation of daily wetting and draining cycles of contaminated water amended with an electron donor. Covering the infiltration area with bentonite ensured anaerobic conditions. The soil remained unsaturated, and redox potential dropped to < -200 mV. Perchlorate was reduced continuously from ~1150 mg/L at the inlet to ~300 mg/L at the outlet in daily cycles, with removal efficiency between 60-84%. No signs of bioclogging were observed during the 3-month operation although occasional iron reduction was observed due to excess electron donor. Changes in perchlorate-reducing bacteria numbers were inferred from an increase in pcrA gene abundances from ~105-107 copied per gram at the end of the experiment, indicating the growth of perchlorate-reducing bacteria.
Journal of Hazardous Materials 324(Pt B):398-405(2017)
The capacity of topsoil to serve as a bioreactor for perchlorate degradation was investigated by infiltrating polluted groundwater under unsaturated conditions in column experiments designed to simulate typical remediation operation of daily wetting and draining cycles of contaminated water amended with an electron donor. Covering the infiltration area with bentonite ensured anaerobic conditions. The soil remained unsaturated, and redox potential dropped to < -200 mV. Perchlorate was reduced continuously from ~1150 mg/L at the inlet to ~300 mg/L at the outlet in daily cycles, with removal efficiency between 60-84%. No signs of bioclogging were observed during the 3-month operation although occasional iron reduction was observed due to excess electron donor. Changes in perchlorate-reducing bacteria numbers were inferred from an increase in pcrA gene abundances from ~105-107 copied per gram at the end of the experiment, indicating the growth of perchlorate-reducing bacteria.
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