Effects of sulfuroxy anions on degradation of pentachlorophenol by a methanogenic enrichment culture

Torben Madsen, Jens Aamand

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62 Citationer (Scopus)

Abstrakt

We studied the degradation of pentachlorophenol (PCP) under methanogenic and sulfate-reducing conditions with an anaerobic mixed culture derived from sewage sludge. The consortium degraded PCP via 2,3,4,5-tetrachlorophenol, 3,4,5-trichlorophenol, and 3,5-dichlorophenol and eventually accumulated 3-chlorophenol. Dechlorination of PCP and metabolites was inhibited in the presence of sulfate, thiosulfate, and sulfite. A decrease in the rate of PCP transformation was noted when the endogenous dissolved H2 was depleted below 0.11 μM in sulfate-reducing cultures. The effect on dechlorination observed with sulfate could be relieved by addition of molybdate, a competitive inhibitor of sulfate reduction. Addition of H2 reduced the inhibition observed with sulfuroxy anions. The inhibitory effect of sulfuroxy anions may be due to a competition for H2 between sulfate reduction and dechlorination. When cultured under methanogenic conditions, the consortium degraded several chlorinated and brominated phenols.

OriginalsprogEngelsk
Sider (fra-til)2453-2458
Antal sider6
TidsskriftApplied and Environmental Microbiology
Vol/bind57
Udgave nummer9
DOI
StatusUdgivet - 1991
Udgivet eksterntJa

Emneord

  • chlorinated phenols
  • reductive dechlorination
  • anaerobic

Programområde

  • Programområde 2: Vandressourcer

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