Survey of the Anaerobic Biodegradation Potential of Organic Chemicals in Digesting Sludge

摘要: The degradation potential of 77 organic chemicals under methanogenic conditions was examined with an anaerobic digesting sludge from the United Kingdom. Degradation assessed in terms net total gas (CH4 plus CO2) produced, expressed as a percentage theoretical production (ThGP). compounds tested were selected various chemical groups and included substituted phenols benzoates, pesticides, phthalic acid esters, homocyclic heterocyclic ring compounds, glycols, monosubstituted benzenes. results obtained good agreement published surveys biodegradability U.S. sludges other environments. In general, presence chloro or nitro inhibited production, while carboxyl hydroxyl facilitated biodegradation. relationship between substituent position susceptibility to compound dependent. following completely degraded (≥80% ThGP) at concentration 50 mg carbon per liter: phenol, 2-aminophenol, 4-cresol, catechol, sodium benzoate, 4-aminobenzoic acid, 3-chlorobenzoic ethylene glycol, diethylene triethylene stearate, quinoline. 3-Cresol, 4-chlorobenzoic dimethyl phthalate, pyridine partially degraded. Although remaining either persistent toxic, their behavior may differ more environmentally realistic chemical-to-biomass ratios. Our findings suggest that assessments made one source can be extrapolated another reasonable degree confidence should help predicting fate during digestion sewage sludge.