NDLI: Influence of sulfate reduction on the microbial dechlorination of pentachloroaniline in a mixed anaerobic culture

Content Provider	Springer Nature Link
Author	Ismail, Zainab Z. Pavlostathis, Spyros G.
Copyright Year	2009
Abstract	The reductive dechlorination of pentachloroaniline (PCA) was investigated in the absence and presence of sulfate in batch assays using a PCA-dechlorinating mixed anaerobic culture with methanol as the external electron donor at neutral pH and 22°C. PCA at an initial concentration of 7.8 μM was sequentially dechlorinated to dichlorinated anilines in the sulfate-free culture and the culture amended with 300 mg sulfate-S/L. At an initial concentration of 890 mg sulfate-S/L, a higher sulfate reduction rate was achieved, but PCA dechlorination was not observed until the sulfate concentration dropped to about 100 mg S/L. The transient inhibition of PCA is attributed to competition between sulfate reducing and dechlorinating species for electron donor, more likely for H2 resulting from methanol fermentation. A long-term (118 days) PCA dechlorination assay with the sulfate-amended culture, which included five feeding cycles, resulted in accumulation of both sulfide (886 mg S/L) and acetate (1,900 mg COD/L). Under these conditions, the sulfate reducers were inhibited, while the rate and pathway of PCA dechlorination were not affected. The results of this study show that the rate of sulfate reduction rather than the sulfate concentration alone dictates the outcome of the competition between sulfate reducers and either dechlorinators or methanogens. The findings of the present study have significant implications relative to the fate and transport of PCA and its dechlorination products in sulfate-laden subsurface systems.
Starting Page	43
Ending Page	57
Page Count	15
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	21
Issue Number	1
e-ISSN	15729729
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-06-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Reductive biotransformation Pentachloroaniline dechlorination Sulfate reduction Sulfide toxicity Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Terrestrial Pollution Geochemistry Soil Science & Conservation Microbiology
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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