Biodegradation kinetics at low concentrations (<1μg/L) for aquifer pesticide contaminants

摘要

Aerobic biodegradation of 2,4-dichlorophenoxyacetic acid (2,4-D) was studied in groundwater added sediment fines. At concentrations at or below 1μg/L of 2,4-D degradation kinetic was of true first order without significant growth of specific degraders and with half-life for mineralization in the order of 200 days. Higher concentrations of 2,4-D resulted in a grossly overestimate of the actual degradation rate for concentrations characteristic for Danish found in groundwater.