Microbial dechlorination of 2,4,6-trichlorophenol in anaerobic sewage sludge.
The dechlorination of 2,4,6-trichlorophenol (TCP) in municipal sewage sludge with a chlorophenol (CP)-adapted consortium was investigated. Results show that dechlorination rates differed according to the source of the sludge samples used in the batch experiments. No significant differences in 2,4,6-TCP dechlorination were observed following treatment with inoculum at densities ranging from 10% to 50% (V/V), but a significant delay was noted at 5% (V/V) density. Overall, results show that the higher the 2,4,6-TCP concentration, the slower the dechlorination rate. The addition of acetate, lactate, pyruvate, vitamin B12 or manganese dioxide did not results in a significant change in 2,4,6-TCP dechlorination. Data collected from a bioreactor experiment revealed that pH 7.0 and a total solid concentration of 10 g/L were optimal for dechlorination. Dechlorination rates decreased significantly at higher agitation speeds. 2,4,6-TCP dechlorination was enhanced under methanogenic conditions, but it was inhibited under denitrifying and sulfate-reducing conditions.
Chang
B V
BV
Department of Microbiology, Soochow University, Taipei, Taiwan, ROC.
Chiang
C W
CW
Yuan
S Y
SY
D000693:Anaerobiosis; D019149:Bioreactors; D017606:Chlorine Compounds / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D012722:Sewage; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis*
D017606:Chlorine Compounds; D002733:Chlorophenols; D012722:Sewage; D014874:Water Pollutants, Chemical; C024564:2,4,6-trichlorophenol