Citation:

Haggblom, M., M. Rivera, AND L. Young. INFLUENCE OF ALTERNATIVE ELECTRON ACCEPTORS ON THE ANAEROBIC BIODEGRADABILITY OF CHLORINATED PHENOLS AND BENZOIC ACIDS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/287 (NTIS PB93236255).

Description:

Nitrate, sulfate, and carbonate were used as electron acceptors to examine the anaerobic biodegradability of chlorinated aromatic compounds in estuarine and freshwater sediments. he respective denitrifying, sulfidogenic, and methanogenic enrichment cultures were established on each of the monochlorinated phenol and monochlorinated benzoic acid isomers, using sediment from the upper (freshwater) and lower (estuarine) Hudson River and the East River (estuarine) as source materials. tilization of each chlorophenol and chlorobenzoate isomer was observed under at least one reducing condition; however, no single reducing condition permitted the metabolism of all six compounds tested. he anaerobic biodegradation of the chlorophenols and chlorobenzoates depended on the electron acceptor available and on the position of the chlorine substituent. n general, similar activities were observed under the different reducing conditions in both the freshwater and estuarine sediments. nder denitrifying conditions, degradation of 3- and 4-chlorobenzoate was accompanied by nitrate loss corresponding reasonably to the stoichiometric values expected for complete oxidation of the chlorobenzoate to CO2. nder sulfidogenic conditions, 3- and 4-chlorobenzoate, but not 2-chlorobenzoate, and all three nonochlorophenol isomers were utilized, whereas, under methanogenic conditions, all compounds except 4-chlorobenzoate were metabolized. iodegradability appears to be more a function of the presence of competent microbial populations than one of inherent molecular structure.

URLs/Downloads:

Record Details:

Document IDs: