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ANAEROBIC BIODEGRADATION OF 2,4-DICHLOROPHENOL IN FRESHWATER LAKE SEDIMENTS AT DIFFERENT TEMPERATURES
Citation:
Kohring, G., J. Rogers, AND J. Wiegel. ANAEROBIC BIODEGRADATION OF 2,4-DICHLOROPHENOL IN FRESHWATER LAKE SEDIMENTS AT DIFFERENT TEMPERATURES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/054 (NTIS PB89147495), 1989.
Description:
Anaerobic degradation of 2,4-dichlorophenol (2,4-DCP) between 5 and 72C was investigated. naerobic sediment slurries prepared from local freshwater sediments were partitioned into anaerobic tubes or serum vials, which then were incubated separately at the various temperatures. eductive 2,4-DCP dechlorination occurred only in the temperature range between 5 and 5OC, although methane was formed up to 6OC. n sediment samples from two sites and at all temperatures from 5 to 5OC, 2,4-DCP was transformed to 4-chlorophenol (4-CP). he 4-CP intermediate was subsequently degraded after an extended lag period in the temperature range from 15 to 4O0C. daptation periods for 2,4-DCP transformation decreased between 5 and 25C, were essentially constant between 25 and 35C, and increased in the tubes incubated at temperatures between 35 and 40oC. he degradation rates increased exponentially between 15 and 3OC, had a second peak at 35C, and decreased to about 5- of the peak activity by 4OC. n tubes from one sediment sample, incubated at temperatures above 4OC, an increase in the degradation rate was observed following the minimum at 4OC. This suggests that at least two different organisms were involved in the transformation of 2,4-DCP to 4-CP. torage of the original sediment slurries for 2 months at 12C resulted in increased adaptation times but did not affect the degradation rates.