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전산공여체 및 중금속이 폐광폐수 처리를 위한 황산염환원균의 활성에 미치는 영향
백병천,김광복 여수대학교 1998 論文集 Vol.13 No.2
SRB(Sulfate Reducing Bacteria) converts sulfate into sulfide using an organic carbon source as the electron donor. The sulfide formed precipitates the various metals present in the AMD(Acid Mine Drainage). This study is the fundamental research on the treatment of AMD using SRB. Two completely mixed anaerobic reactors were operated for cultivation of SRB at the temperature of 30℃ and anaerobic batch reactors were used to evaluate the influence of electron donor and heavy metals(Cd, Cu, Zn) on the activity of SRB. It was found that glucose was an organic carbon source better than acetate as the electron donor of SRB for sulfate reduction in AMD. At the COD/sulfate ratio from 0.5 to 1.0, amount of sulfate reduction in the reactor with glucose was 1.7∼2.5 times higher than that in the reactor with acetate, and it maximized at the COD(glucose)/sulfate ratio of 0.5. The concnetration of 10㎎ Cd/ℓ, 10㎎ Cu/ℓ, and 8㎎ Zn/ℓ in the influent decreased level of about 50% of initial SRB activity at the reaction time of 2days, respectively. However, SRB activity recovered gradually and ?? concnetration decreased level of 50% of initial SRB activity were 23.4 ㎎/ℓ of Cd, 21.9㎎/ℓ of Cu, 27.5㎎/ℓ of Zn, at the reaction time of 10 days, respectiviely.
김광복,김용일,천희곤,조동율,구경완 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.1
The crystal structure of ZnS fabricated by gas-liquid phase reaction was refined by the Rietveld program using X-ray diffraction data. The R-weighted pattern (R$\sub$wp/) of ZnS powder was 10.85%. The fraction of HCP phase was closely related with extra amount of H$_2$S gas. The lattice parameters and crystalline size were changed by the relative ratio of multi-phase. The luminescence property of ZnS:Cu, Al green phosphors prepared by conventional methods was good in the range of 91∼94% and 150∼190${\AA}$, respectively. According to the maximum entropy electron density(MEED) methods, any defects in (001) plane of cubic phase were not found. We suggest that both the Rietveld and maximum entropy density methods may be useful tools for studying luminescence mechanism of other phosphors materials.