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Thiobacillus ferrooxidans 를 이용한 광산폐기물내의 중금속 용해에 관한 기초연구
강선홍,최상일 ( Seon Hong Kang,Sang Il Choi ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
Zinc metal and zinc sulfide were recovered by oxidative dissolution using Thiobacillus ferrooxidans, which is aerobic, autotrophic, and acidophilic bacteria. Thiobacillus ferrooxidans derive energy from oxidation of ferrous iron and elemental sulfur using molecular oxygen as an electron acceptor. From the 10,000㎎/L of initial zinc concentration, 97% solubilization of zinc metal was obtained from coarse FeS₂ due to microbial action. Also, about 70% metal solubilization occurred with fine sized materials in 58days. The general trend observed for the ZnS systems was a decrease in pH with time. The pH drop is an indication that microorganisms are acclimating and producing acidic by-products. The iron oxidation state changes due to substrate containing coarse particle size FeS₂ was shown. The sharp drop of ratio of Fe(II)/Fe(Total) and sharp increase of ratio of Fe(III)/Fe(Total) was observed in 20days after inoculation. Thus, microbial activity began more rapidly for the coarse particle size substrate than for the fine FeS₂.
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강선홍,최상일 ( Seon Hong Kang,Sang Il Choi ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
Prior studies at Iowa State University tend to indicate that petroleum products such as gasoline, diesel fuel, and crude oil can be removed from soil by bioremediation. These studies also indicate that gasoline would largely be removed by volatilization and that diesel fuel would not. In order to investigate volatilization as a competing process for the removal of fuels with bioremediation, the movement of gasoline in the sand was investigated and a model based on a material balance was developed to predict the evaporation of petroleum products from contaminated sand. The results show that the fuel was drying out from the top down and at the level where the liquid fuel is found, the air in the pore space in the sand is saturated with fuel vapor. Diffusion moves the vapor to the surface of the sand where the flow of air maintains the fuel vapor concentrations near zero. The model explains that the evaporation pressure is an important factor and why the rate of volatilization of gasoline is much higher than that of diesel fuel.
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