Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
684306 | Bioresource Technology | 2009 | 7 Pages |
Abstract
This study verifies the potential applicability of horizontal-flow anaerobic immobilized biomass (HAIB) reactors to pentachlorophenol (PCP) dechlorination. Two bench-scale HAIB reactors (R1 and R2) were filled with cubic polyurethane foam matrices containing immobilized anaerobic sludge. The reactors were then continuously fed with synthetic wastewater consisting of PCP, glucose, acetic acid, and formic acid as co-substrates for PCP anaerobic degradation. Before being immobilized in polyurethane foam matrices, the biomass was exposed to wastewater containing PCP in reactors fed at a semi-continuous rate of 2.0 μg PCP gâ1 VS. The applied PCP loading rate was increased from 0.05 to 2.59 mg PCP lâ1 dayâ1 for R1, and from 0.06 to 4.15 mg PCP lâ1 dayâ1 for R2. The organic loading rates (OLR) were 1.1 and 1.7 kg COD mâ3 dayâ1 at hydraulic retention times (HRT) of 24 h for R1 and 18 h for R2. Under such conditions, chemical oxygen demand (COD) removal efficiencies of up to 98% were achieved in the HAIB reactors. Both reactors exhibited the ability to remove 97% of the loaded PCP. Dichlorophenol (DCP) was the primary chlorophenol detected in the effluent. The adsorption of PCP and metabolites formed during PCP degradation in the packed bed was negligible for PCP removal efficiency.
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Authors
M.H.R.Z. Damianovic, E.M. Moraes, M. Zaiat, E. Foresti,