A microcosm study on bioremediation of fenitrothion-contaminated soil using Burkholderia sp. FDS-1 [An article from: International Biodeterioration & Biodegradation]

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Description:
Fenitrothion, a toxic organophosphorus pesticide, can build up the concentration of nitrophenolic compound in soils and hence needs to be removed. Burkholderia sp. FDS-1, a fenitrothion-degrading strain, was used in this work to study factors affecting its growth, and then evaluated for its capacity to degrade fenitrothion in soil microcosms. Minimal salt medium containing 1% (w/v) glucose was found to be a suitable carbon source for inoculum preparation. Various factors, including soil pH, temperature, initial fenitrothion concentration, and inoculum size influenced the degradation of fenitrothion. Microcosm studies performed with varying concentrations (1-200mgkg^-^1) of fenitrothion-spiked soils showed that strain FDS-1 could effectively degrade fenitrothion in the range of 1-50mgkg^-^1 soil. The addition of Burkholderia sp. FDS-1 at 2x10^6 colony forming unitsg^-^1 soil was found to be suitable for fenitrothion degradation over a temperature range of 20-40^oC and at a slight alkaline pH (7.5). The results indicate that strain FDS-1 has potential for use in bioremediation of fenitrothion and its metabolite-contaminated sites. This is a model study that could be used for decontamination of sites contaminated with other compounds.