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PILOT-SCALE EVALUATION OF A PERMEABLE REACTIVE BARRIER WITH COMPOST AND BROWN COAL TO TREAT GROUNDWATER CONTAMINATED WITH TRICHLOROETHYLENE
Grajales-Mesa, S.J. and G. Malina. | Water 11(9):1922(2019)
A 198-day study at a site in Poland evaluated the efficiency of a permeable reactive barrier (PRB) with compost and brown coal to remediate TCE-contaminated groundwater. Concentrations measured 109 µg/L. Three stainless steel boxes (1.2 x 0.5 x 0.5 m) with the brown coal-compost mixture at 3 different mixing ratios of 1:1, 1:3, and 1:5 were installed to simulate the PRB. Groundwater from a TCE-contaminated aquifer was pumped into the system at a flow rate of 3.6 L/h and resided for 25, 20, or 10 h. Effluent samples were analyzed for TCE and its daughter products DCE, VC, and ethane. During the study period, TCE concentrations in groundwater decreased to ≤ 1.1 µg/L. After 16 days, an increase in cis-1,2-DCE indicated possible TCE reductive dechlorination, but complete transformation of TCE into non-toxic by-products was not evidenced during the pilot, indicating that reductive dechlorination slowed down or stopped at DCE and designed residence times were not long enough to allow the complete dechlorination process. This article is Open Access at https://www.mdpi.com/2073-4441/11/9/1922
A 198-day study at a site in Poland evaluated the efficiency of a permeable reactive barrier (PRB) with compost and brown coal to remediate TCE-contaminated groundwater. Concentrations measured 109 µg/L. Three stainless steel boxes (1.2 x 0.5 x 0.5 m) with the brown coal-compost mixture at 3 different mixing ratios of 1:1, 1:3, and 1:5 were installed to simulate the PRB. Groundwater from a TCE-contaminated aquifer was pumped into the system at a flow rate of 3.6 L/h and resided for 25, 20, or 10 h. Effluent samples were analyzed for TCE and its daughter products DCE, VC, and ethane. During the study period, TCE concentrations in groundwater decreased to ≤ 1.1 µg/L. After 16 days, an increase in cis-1,2-DCE indicated possible TCE reductive dechlorination, but complete transformation of TCE into non-toxic by-products was not evidenced during the pilot, indicating that reductive dechlorination slowed down or stopped at DCE and designed residence times were not long enough to allow the complete dechlorination process. This article is Open Access at https://www.mdpi.com/2073-4441/11/9/1922
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