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This study reports the feasibility of removing pentachlorophenol (PCP) by an acidogenic process in batch reactors. When the acidogenic sludge was first acclimated with 2,4,6-trichlorophenol (2,4,6-TCP) and developed 2,4,6-TCP dechlorinating activity, PCP could be ortho-dechlorinated to 3,4,5,-trichlorophenol (3,4,5-TCP) via 2,3,4,5-tetrachlorophenol as the intermediary. However, due to PCP's higher...
Dechlorination of 2,4,6-trichlorophenol to 4-chlorophenol under acidogenic conditions (pH 5.6–6.5) was successfully induced by manipulating the start-up procedure of an acidogenic sequencing batch reactor (SBR). A stepwise pH reduction from neutral to acidic level during start-up was crucial for inducing dechlorination. Once induced, dechlorination can proceed at pH as low as 5.6 before inhibition...
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