title: Effectiveness of an anaerobic granular activated carbon fluidized-bed bioreactor to treat soil wash fluids: a proposed strategy for remediating PCP/PAH contaminated soils.
abstract: An integrated system has been developed to remediate soils contaminated with pentachlorophenol (PCP) and polycyclic aromatic hydrocarbons (PAHs). This system involves the coupling of two treatment technologies, soil-solvent washing and anaerobic biotreatment of the extract. Specifically, this study evaluated the effectiveness of a granular activated carbon (GAC) fluidized-bed reactor to treat a synthetic-waste stream of PCP and four PAHs (naphthalene, acenaphthene, pyrene, and benzo(b)fluoranthene) under anaerobic conditions. This waste stream was intended to simulate the wash fluids from a soil washing process treating soils from a wood-preserving site. The reactor achieved a removal efficiency of greater than 99.8% for PCP with conversion to its dechlorination intermediates averaging 46.5%. Effluent, carbon extraction, and isotherm data also indicate that naphthalene and acenaphthene were removed from the liquid phase with efficiencies of 86 and 93%, respectively. Effluent levels of pyrene and benzo(b)fluoranthene were extremely low due to the high-adsorptive capacity of GAC for these compounds. Experimental evidence does not suggest that the latter two compounds were biochemically transformed within the reactor.
authors.affiliation: Department of Civil and Environmental Engineering, University of Cincinnati, OH 45221-0071, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Koran
authors.forename: M T
authors.initials: MT
authors.lastname: Suidan
authors.forename: A P
authors.initials: AP
authors.lastname: Khodadoust
authors.forename: G A
authors.initials: GA
authors.lastname: Sorial
authors.forename: R C
authors.initials: RC
authors.lastname: Brenner
mesh_terms: D000073:Acenaphthenes / Q000032:analysis; D000693:Anaerobiosis; D019149:Bioreactors; D002606:Charcoal / Q000737:chemistry; D007700:Kinetics; D015233:Models, Statistical; D009281:Naphthalenes / Q000032:analysis; D010416:Pentachlorophenol / Q000032:analysis* / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000302:isolation & purification*; D011721:Pyrenes / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000073:Acenaphthenes; D009281:Naphthalenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002606:Charcoal; C031721:naphthalene; C030984:pyrene; D010416:Pentachlorophenol; C042552:acenaphthene