Summary
A mixed bacterial culture capable of reducing perchlorate stoichiometrically to chloride under naerobic conditions was enriched from municipal digester sludge. The reduction of 10 mM perchlorate resulted in oxidation of the medium and cessation of perchlorate reduction. The activity was recovered on addition of a reducing agent. Addition of air to the culture during perchlorate reduction immediately terminated the process and aeration for 12 h permanently destroyed the ability of the culture to reduce perchlorate. The culture also reduced nitrite, nitrate, chlorite, chlorate and sulfate. The presence of 10 mM nitrite or chlorite completely inhibited perchlorate reduction, whereas the same concentration of chlorate decreased the reduction rate. Nitrate or sulfate did not affect perchlorate reduction. Chlorate and chlorite, suspected intermediates in the reduction of perchlorate to chloride, were not detected in any cultures during reduction of perchlorate.
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Attaway, H., Smith, M. Reduction of perchlorate by an anaerobic enrichment culture. Journal of Industrial Microbiology 12, 408–412 (1993). https://doi.org/10.1007/BF01569673
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DOI: https://doi.org/10.1007/BF01569673