Controlling a toxic shock of pentachlorophenol (PCP) to anaerobic digestion using activated carbon addition
De Araujo, Cecilia
Sze, Chun Chau
Stuckey, David Campbell
Date of Issue2015
School of Civil and Environmental Engineering
Nanyang Environment and Water Research Institute
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.
DRNTU::Engineering::Environmental engineering::Waste management
© 2015 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Bioresource Technology, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.biortech.2015.01.080].