Evaluation of anaerobic treatment for bioremediation of pesticide contaminated soil

摘要

The pesticides DDT (1, 1, 1-trichloro-2, 2-bis(p-chlorophenyl)ethane) and BHC (hexachlorocy-clohexane) were widely used for several decades for control of agricultural pests and domestic insects before being banned in most western countries.~(1-3) Disposal of wastes and bulk by-products associated with the manufacture and formulation of thse chemicals resulted in soil, sediment, and aquifer contamination that is now the focus of corrective action. Cleanup of pesticide contaminated sites usually involves excavation and thermal treatment of soil which exceeds health-based levels. For those areas with low contaminant levels, or where it is technically impractical to excavate the soil, in situ technologies are evaluated to achieve prescribed groundwater cleanup standards. In situ treatment options include solidification or stabilization, solvent extraction, vapor extraction, soil flushing, and bioremediation, among others. Ex situ treatment of pesticide contaminated soil using these techhologies may be practical in some cases, specifically where the level of contamination is moderate.