Diversity of anaerobic microbial processes in chlorobenzoate degradation: nitrate, iron, sulfate and carbonate as electron acceptors.
The utilization of monochlorobenzoate isomers (2-, 3- and 4-chlorobenzoate) by anaerobic microbial consortia in River Nile sediments was systematically evaluated under denitrifying, Fe-reducing, sulfidogenic and methanogenic conditions. Loss of all three chlorobenzoates was noted in denitrifying cultures; furthermore, the initial utilization of chlorobenzoates was fastest under denitrifying conditions. Loss of 3-chlorobenzoate was seen under all four reducing conditions and the degradation of chlorobenzoates was coupled stoichiometrically to NO3- loss, Fe2+ production, SO4(2-) loss or CH4 production, indicating that the chlorobenzoates were oxidized to CO2. To our knowledge, this is the first observation of halogenated aromatic degradation coupled to Fe reduction.
Kazumi
J
J
Center for Agricultural Molecular Biology, Cook College, Rutgers, State University of New Jersey, New Brunswick 08903-0231, USA.
Häggblom
M M
MM
Young
L Y
LY
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002254:Carbonates / Q000378:metabolism; D002723:Chlorobenzoates / Q000378:metabolism*; D004534:Egypt; D005296:Ferrous Compounds / Q000378:metabolism; D005618:Fresh Water; D019015:Geologic Sediments / Q000382:microbiology; D009566:Nitrates / Q000378:metabolism; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism
D002254:Carbonates; D002723:Chlorobenzoates; D005296:Ferrous Compounds; D009566:Nitrates; D013431:Sulfates