BIODEGRADATION OF ORGANIC HAZARDOUS WASTES BY LAND TREATMENT PROCESS (TOXIC WASTE, SOIL ENVIRONMENT).

摘要

Scope and Method of Study. Land treatment is a economically feasible and environmentally sound technique for treating and disposing of hazardous waste material. For this state-of-art methodology, very limited biokinetic information is available.;Findings and Conclusions. Each compound was found to have distinct biodegradative characteristics. The phased first-order kinetics best described the biodegradation of organic waste in the soil environment. A high waste loading inhibited the biodegradation in the soil reactor. Soil cultivation was found to enhance the biological utilization of waste materials. Higher efficiency of waste decomposition was observed when soil reactor was incubated at elevated temperature 39(DEGREES)C than that at 20(DEGREES)C. BOD, COD, TOC, and specific compound concentration were monitored for all the reactors. The specific compound concentration by GC/MS analysis and BOD was considered to be the proper parameters describing the waste removal in the hazardous waste land treatment.;This study investigated the land treatability of various hazardous wastes. Laboratory-scale experiments were conducted by using the biological soil reactors loaded with treatment medium, a Derby sand and a Port silt. The hazardous wastes investigated included: (a) the pure-compound synthetic wastes: phenol, nitro- benzene, DCP, DNP and PCP, (b) the combined-compound synthetic wastes, and (c) the actual industrial waste sludges including a wood preserving waste sludge, a DAF sludge and a slop oil.