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2303858 
Book/Book Chapter 
Dechlorination potential of wetland soils for treatment of contaminated groundwater 
Slusser, TJ; Shelley, ML; Agrawal, A 
2001 
BIOREMEDIATION SERIES 
6 
5 
95-104 
WOS:000175096900012 
The ability of a natural microbial consortium in organic rich soil samples from a drained wetland to reductively dechlorinate perchloroethene (PCE) to innocuous end products was evaluated in microcosm bioreactors. Laboratory studies over the past 12 months revealed that, after acclimation, the indigenous soil microbes were able to rapidly degrade PCE via reductive dechlorination. Disappearance time for 3.62 mumoles PCE decreased from 35 days to 5 days for five consecutive doses over a 3-month period. PCE dechlorination resulted in rapid accumulation of cis 1,2-dichloroethene (cis-DCE) and sluggish production of minor amounts of vinyl chloride and ethene. Short term analysis of mass-time plots suggest cis-DCE is undegradable in these bioreactors, as inferred from stable concentrations over time. Long term analysis showed decrease in cis-DCE concentrations, on the order of several mumoles, accompanied by an increase in vinyl chloride (VC) and ethene concentrations. High initial mass of cis-DCE (72 mumoles) resulted in substantial inhibition of methanogenesis and a 28 mumole decrease in cis-DCE mass. These results provide insight on the fate of field scale studies using the same soil in constructed wetland bioreactors for bioremediation of contaminated groundwater. 
Environment Abstracts; SOLVENTS; BIODEGRADATION, MICROORGANISM; CHLORINATED HYDROCARBONS; WETLANDS, CONSTRUCTED; BIOREMEDIATION; GROUNDWATER; ENA 07:General