Development of tetrachloroethene transforming anaerobic cultures from municipal digester sludge
- Univ. of Washington, Seattle, WA (United States). Dept. of Civil Engineering
- Tampere Univ. of Technology (Finland)
Three different systems were used to enrich for tetrachloroethene (PCE) and cis-dichloroethene (c-DCE) dechlorinators from municipal sludge digesters. In semicontinuously fed digesters with PCE, the enrichment accumulated vinyl chloride (VC). Batch enrichments that were repeatedly fed and spiked with lactate and PCE or c-DCE developed complete dechlorination to ethene. Fluidized-bed reactors (FBRs) fed with lactate and PCE or c-DCE dechlorinated to ethene with small residual VC in the effluent. Dechlorination always developed sequentially. Trichloroethene (TCE) was the predominant product for a short period, whereas c-DCE and especially VC were predominant for a longer time before being transformed to ethene. The rate of dechlorination correlated with chloroethene loadings. Feeding c-DCE instead of PCE did not significantly affect the time required for ethene generation. All dechlorinations occurred with methanogenesis.
- OSTI ID:
- 474267
- Report Number(s):
- CONF-950483--; ISBN 1-57477-005-5
- Country of Publication:
- United States
- Language:
- English
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