Transformations of 1,1,2,2-Tetrachloroethane under Methanogenic Conditions

doi:10.1021/ES9502987

Paper

Transformations of 1,1,2,2-Tetrachloroethane under Methanogenic Conditions

Published Jan 29, 1996 · Chun Chen, J. Puhakka, J. Ferguson

Environmental Science & Technology

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Abstract

Abiotic and biotic transformations of 1,1,2,2-tetrachloroethane (TeCA) under methanogenic conditions were studied. TeCA degradation started without lag with municipal digester sludge. 1,1,2-Trichloroethane (1,1,2-TCA), trans-1,2-dichloroethene (tDCE), and cis-1,2-dichloroethene (cDCE) were products of biotic transformation, while trichloroethene (TCE) resulted from abiotic degradation. TCE was further transformed to cDCE, vinyl chloride (VC), and ethene. Ethene, VC, and tDCE were the persistent products of TeCA transformations. With the same municipal digester sludge culture, 1,1,2-TCA was removed and converted to 1,2-dichloroethane (1,2-DCA) and VC. 1,2-DCA partially degraded, resulting in chloroethane and ethene formation. Reductive dechlorination, dichloroelimination, and dehydrochlorination simultaneously took place during the degradation of TeCA. Dichloroelimination and dehydrochlorination played important roles in the removal of TeCA and 1,1,2-TCA under methanogenic conditions.

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Study Snapshot

Tetrachloroethane degradation in municipal digester sludge leads to 1,2,2-dichloroethane and VC, with chloroelimination and dehydrochlorination playing key roles in removal.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Transformations of 1,1,2,2-Tetrachloroethane under Methanogenic Conditions

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