외부탄소원으로 활성화된 토착미생물에 의한 화약물질(TNT and RDX) 분해 최적화

Abstract

Contamination of explosive compounds in the soils of military shooting range may pose risks to human and ecosystems. As shooting ranges are located at remote places, active remediation processes with hardwares and equipments are lesspractical to implement than natural solutions such as bioremediaton. In this study, a series of experiments was conductedto select a suitable carbon source and to optimize dosing rate for the enhanced bioremediation of explosive compounds insurface soils and sediments of shooting ranges with indigenous microorganisms activated by external carbon source. Treatability study using slurry phase reactors showed that the presence of indigenous microbial community capable ofexplosive compounds degradation in the shooting range soils, and starch was a more effective carbon source than glucoseand acetic acid in the removal of TNT. However, at higher starch/soil ratio, i.e., 2.0, the acute toxicity of the liquid phaseincreased possibly due to transformation products of TNT. RDX degradation by indigenous microorganisms was alsostimulated by the addition of starch but the acute toxicity of the liquid phase decreased with the increase of starch/soilratio. Taken together, the optimum range of starch/soil ratio for the degradation of explosive compounds withoutsignificant increase in acute toxicity was found to be 0.2 of starch/soil.