title: Biodegradation of o-benzyl-p-chlorophenol.
abstract: The extent of biodegradation of o-benzyl-p-chlorophenol, marketed as a germicide under the name Santophen((R)) 1 (Monsanto Co.), in river water, sewage, and activated sludge was determined. Biodegradation was assessed by use of a colorimetric procedure for phenolic materials, carbon analysis, and CO(2) evolution. In unacclimated river water, 0.1 mg of Santophen 1 per liter was degraded within 6 days. In sewage, 0.5 and 1.0 mg/liter levels of Santophen 1 were degraded in 1 day. Acclimated activated sludge achieved 80% biodegradation of 1.0 mg/liter Santophen 1 in 8 h and 100% in 24 h. When effluent from a semicontinuous activated sludge unit, acclimated to 20 mg of Santophen 1 per liter was used as the inoculum for the CO(2) evolution procedure, 60% of the total theoretical CO(2) was evolved from Santophen 1. Based on the results of these studies, indicating Santophen 1 to be readily biodegraded in at least four biological systems, the continued use of present levels of Santophen 1 should present no significant environmental problems.
mesh_terms: D000476:Alkanesulfonates / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D002245:Carbon Dioxide / Q000096:biosynthesis; D002951:Citrates / Q000378:metabolism; D003124:Colorimetry; D004202:Disinfectants / Q000378:metabolism*; D005618:Fresh Water; D006843:Hydrocarbons, Chlorinated / Q000378:metabolism*; D012722:Sewage; D014871:Water Microbiology
chemical_list: D000476:Alkanesulfonates; D002951:Citrates; D004202:Disinfectants; D006843:Hydrocarbons, Chlorinated; D012722:Sewage; D002245:Carbon Dioxide