전분 환 투입에 의한 실험실 규모 침전지 저부에서의 생화학적 환경 변화와 화약물질(TNT 및 RDX) 분해

Abstract

A starch ball was devised to conveniently supply carbon source to indigenous microorganisms and to enhancebiotransformation of explosive compounds(TNT and RDX) in the sediments of settling basins installed in militaryshooting ranges. To identify optimum dose/sediment ratio for degradation of explosives in the basin, a series of benchscale settling basin experiments were performed for 30 days while monitoring supernatant pH, DO, concentrations ofnitrite, nitrate, sulfate, explosive compounds, and acute toxicity measured by bacterial luminescence. Addition of starchball induced changes in oxidation conditions from oxic to anoxic in the benthic zone of the basin, which resulted insubsequent reductive degradation of both TNT and RDX in the liquid and solid phase of basin. However, fermentationproducts of excess starch, acetic acid and formic acid, caused acute toxicity in the liquid phase. The optimum ratio ofstarch ball/sediment for explosive compounds degradation by inducing changes in bio-geochemical environments withoutincrease in acute toxicity, was found to be 0.009~0.017.