Journal
BIORESOURCE TECHNOLOGY
Volume 181, Issue -, Pages 303-311Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.01.080
Keywords
Anaerobic digestion; Pentachlorophenol; Toxicity; Activated carbon
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Several powdered and granular activated carbons (PACs and GACs) were tested for adsorption of pentachlorophenol (PCP) in bench-scale anaerobic digestion reactors to control the toxicity of PCP to acetoclastic methanogenesis. Results showed that the adsorption capacities of PAC were reduced by 21-54%, depending on the PAC addition time, in the presence of the methanogenic sludge compared to the controls without sludge. As a preventive measure, PAC at a low dose of 20% (mass ratio to the VSS) added 24 h prior to, or simultaneously with, the addition of PCP could completely eliminate the toxic effects of PCP. At the same dose, PAC also enabled methanogenesis to recover immediately after the sludge had been exposed to PCP for 24 h. GAC was not effective in enabling the recovery of methanogenesis due to its slow adsorption kinetics; however, at a dose of 80% it could partially ameliorate the toxic shock of PCP. (C) 2015 Elsevier Ltd. All rights reserved.
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