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2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN DECHLORINATION IS DIFFERENTIALLY ENHANCED BY DICHLOROBENZENE AMENDMENT IN PASSAIC RIVER, NJ SEDIMENTS
Dean, R.K., C.R. Schneider, H.S. Almnehlawi, K.S. Dawson, and D.E. Fennell.
Environmental Science & Technology [Published online 20 May 2020 prior to print]
Bacteria from sediments of the Passaic River were enriched on TCE and 1,2-DCB and used, along with original unamended sediment, as inocula to dechlorinate 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TeCDD), 1,2,3,4-TeCDD, and 2,7-dichlorodibenzo-p-dioxin (2,7-DiCDD). All inocula dechlorinated 1,2,3,4-TeCDD to different extents, which was more rapid than the other amended congeners. Progressive dechlorination of 2,3,7,8-TeCDD was observed in bottles inoculated with the DCB enrichment culture, and dechlorination of 2,7-DiCDD was observed almost exclusively in bottles inoculated with unamended river sediment. Phylotypes within the Dehalococcoidia class were differentially enriched in DCB versus TCE cultures, indicating that they may play a role in polychlorinated dibenzo-p-dioxins dechlorination.
Environmental Science & Technology [Published online 20 May 2020 prior to print]
Bacteria from sediments of the Passaic River were enriched on TCE and 1,2-DCB and used, along with original unamended sediment, as inocula to dechlorinate 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TeCDD), 1,2,3,4-TeCDD, and 2,7-dichlorodibenzo-p-dioxin (2,7-DiCDD). All inocula dechlorinated 1,2,3,4-TeCDD to different extents, which was more rapid than the other amended congeners. Progressive dechlorination of 2,3,7,8-TeCDD was observed in bottles inoculated with the DCB enrichment culture, and dechlorination of 2,7-DiCDD was observed almost exclusively in bottles inoculated with unamended river sediment. Phylotypes within the Dehalococcoidia class were differentially enriched in DCB versus TCE cultures, indicating that they may play a role in polychlorinated dibenzo-p-dioxins dechlorination.
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