ISSN:
1745-6584
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Energy, Environment Protection, Nuclear Power Engineering
,
Geosciences
Notes:
Pentachlorophenol-acclimated methanogenic consortia were incubated at temperatures of 5, 10, 21, and 31° C in physical models of an interceptor trench. Four identical 5.4 cm diameter brass columns packed with a uniform pea gravel were operated with a 2 day hydraulic retention time in a continuous upflow mode. The columns were fed 25 or 50 mg of acetate per liter, 0.32 or 4.0 μM pentachlorophenol, and a dilute vitamin and nutrient mixture. In the columns operated at 31 and 21° C, pentachlorophenol was reductively dechlorinated at the ortho positions to form 2,3,4,5-tetrachlorophenol and 3,4,5-trichlorophenol. 3,4,5-Trichlorophenol was the sole degradation product observed in the effluent. The lag period prior to pentachlorophenol biotransformation increased with decreasing temperature. At 31° C, a lag of 72 hours was observed; at 21° C the lag was 120 hours; and at 10° C the lag was 744 hours. No biodegradation of pentachlorophenol was observed at 5° C within an 888 hour period. Conversion of pentachlorophenol to 3,4,5-trichlorophenol was complete within the first 7.6 cm of the column at 31 and 21° C. Loss of 90% of the pentachlorophenol was observed over the 30 cm column at 10° C. An interceptor trench inoculated with a temperature- and pentachlorophenol-acclimated methanogenic consortia has the potential to anaerobically biotransform pentachlorophenol at temperatures as low as 10° C.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1745-6584.1996.tb02071.x
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