Simulation of in situ subsurface biodegradation of polychlorophenols in air-lift percolators.
Air-lift percolator experiments simulated in situ subsurface degradation of 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol and pentachlorophenol, in mixtures and individually, by indigenous microorganisms from a chlorophenol-contaminated aquifer. Inoculation with a chlorophenol(CP)-degrading gram-positive isolate from the CP-contaminated groundwater did not significantly increase CP degradation rates. Feed concentrations of up to 55 mg CP l-1 were degraded. Stable CP degradation was maintained for over 6 months. CP degradation rates up to 54.3 mg l-1 day-1 and effluent concentrations below 40 micrograms CP l-1 were achieved. CP were mineralized as shown by CP reduction, dissolved organic carbon removal and release of inorganic chloride.
Department of Environmental Technology, Institute of Water and Environmental Engineering, Tampere University of Technology, FIN-33720 Tampere, Finland.
J H
JH
Langwaldt
M K
MK
Männistö
R
R
Wichmann
J A
JA
Puhakka
D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002733:Chlorophenols / Q000378:metabolism*; D010416:Pentachlorophenol / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000378:metabolism
D002733:Chlorophenols; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C031487:2,3,4,6-tetrachlorophenol; D010416:Pentachlorophenol; C024564:2,4,6-trichlorophenol