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COMPARISON OF VARIOUS SEED CRYSTALS FOR PHOSPHORUS CRYSTALLIZATION PROCESS
Yim, Soo - Bin,Kim, Eung - Ho Research Institute for Science & Technology HONG-I 1997 Hongik Journal of Science and Technology Vol.1 No.-
Efficient removal of phosphorus (P as orthophosphate ) from municipal sewage treatment plant is essential to prevent surface waters from eutrophication. Recently P crystallization method has emerged as an innovative one because it is free from sludge handling problems and requires comparatively less chemical costs. Laboratory-scale studies conducted to compare the various tyoes of seed crystals for P removal by crystallization showed that converter slag released the highest amount of ca? and OH? ions and had the higher P removal efficiency compared to the phosphorus rock and electron arc furnace slg. Converter slag was found to be the best seed crystal among the four seed materials studied. As several components on the slag surface are related to the P adsorption, the observations of the slag surface with scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS) were carried out. From the observations of slag surface by SEM and EDS analysis, it was found that the surface of the seed crystals is transformed from anorphous to crystalline phase with the increase of P removal. Finely distributed cubical crystalline formed on the surface of the converter slag was founed to be hydroxyapatite.
Complexation of Co-contaminant Mixtures between Silver(Ⅰ) and Polycyclic Aromatic Hydrocarbons
Yim, Soo-Bin 한국환경과학회 2003 한국환경과학회지 Vol.12 No.8
The complexation of co-contaminant mixtures between Ag(I) and polycyclic aromatic hydrocarbon (PAH) molecules (naphthalene, pyrene, and perylene) were investigated to quantify the equilibrium constants of their complexes and elucidate the interactions between Ag(1) and PAH molecules. The apparent solubilities of PAHs in aqueous solutions increased with increasing Ag(I) ion concentration. The values, K₁ and K₂ of equilibrium constants of complexes of Ag(I)-PAHs, were 2.990 and 0.378, 3.615 and 1.261, and 4.034 and 1.255, for naphthalene, pyrene, and perylene, respectively. The K₁, and K₂ values of PAHs for Ag(I) increased in the order of naphthalene < pyrene < perylene and naphthalene < pyrene≒perylene, respectively, indicating that a larger size of PAH molecule is likely to have more a richer concentrarion of electrons on the plane surfaces which can lead to stronger complexes with the Ag(I) ion. For the species of Ag(I)-PAH complexes, a 1:1 Ag(I) : the aromatic complex, AgAr^+, was found to be a predominant species over a 2:1 Ag(I) : aromatic complex, Ag₂Ar^(++). The PAH molecules with four or more aromatic rings and/or bay regions were observed to have slightly less affinity with the Ag(I) ion than expected, which might result from inhibiting forces such as the spread of aromatic it electrons over a wide molecular surface area and the intermolecular electronic repulsion in bay regions.
제강전로슬래그를 정석재로 이용한 Struvite 정석반응에 의한 질소와 인의 제거특성
임수빈(Soo Bin Yim) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.9
제철소에서 산업부산물로 다량 발생되는 제강전로슬래그를 struvite 정석반응의 정석재로 사용하여 고농도의 질소와인의 제거특성을 파악하고자 하였다. NH₄-N와 PO₄-P의 제거 및 회수를 위한 struvite 정석반응의 최적의 pH영역은 8.0~8.75 범위로 확인되었다. pH 8.0~8.75 영역에서 struvite 침전 및 정석반응에 의한 총제거효율은 NH₄-N와 PO₄-P에 대하여 각각 34.3~61.0%와 91.0~96.2%의 값을 나타냈다. Struvite 정석반응에 의한 NH₄-N의 제거는 pH 8.5에서 29.4%의 최대값을 보였고 PO₄-P의 경우 pH 8.0에서 65.1%로 최대값을 나타냈다. 수중의 Ca 이온농도가 증가할수록 struvite 정석반응에 의한 NH₄-N의 제거효율은 감소하는 경향을 나타냈으며 PO₄-P의 경우에는 Ca 이온농도의 변화에 총제거효율이 크게 변하지 않았다. SEM, EDS 및 XRD 분석결과 struvite 정석반응에서 NH₄-N과 PO₄-P의 제거는 MAP과 HAp 결정이 독립적으로 혹은 정석재의 표면상에 발생함으로써 진행되는 것으로 판단되었다. This study investigated the removal characteristics of highly concentrated NH₄-N and PO₄-P by struvite crystallization using converter slag as a seed crystal. The optimal pH range for removal and recovery of NH₄-N and PO₄-P by struvite crystallization was measured to be 8.0~8.75, in which total removal efficiencies for NH₄-N and PO₄-P by struvite precipitation and crystallization were 34.3~61.0% and 91.0~96.2%, respectively. The maximum removal efficiencies for NH₄-N and PO₄-P by struvite crystallization were 29.4% at pH 8.5 and 65.1% at pH 8.0, respectively. The removal efficiency of NH₄-N by struvite crystallization decreased with increasing calcium ion concentration. The analysis results of SEM, EDS and XRD exhibited that NH₄-N and PO₄-P in meta-stable region of struvite crystallization could be eliminated through formation of magnesium ammonia phosphate (MAP) and hydroxyapatite (HAp) on seed crystals by struvite precipitation and crystallization.
컬럼반응조 내 충진된 다공성 zeolite-slag 세라믹에 의한 산성광산배수의 처리특성
임수빈 ( Soo-bin Yim ) 한국수처리학회 2018 한국수처리학회지 Vol.26 No.5
The objective of this research is to investigate the removal characteristics of heavy metals and sulfate ion from acid mine drainage (AMD) in a column reactor system by spherical-type porous zeolite-slag ceramics (ZS ceramics). The hydraulic retention time (HRT) condition of 24 hours in the column reactor system was found to more efficiently treat the AMD than that of 12 hours. The increment of mixing amount of converter slag in porous ZS ceramics from 1:1(Z:S) to 1:3(Z:S) was observed to enhance the removal efficiency of Cu, Cd, Mn, and Zn by 13.4%, 32.6%, 22.0%, and 48.2%, respectively. In addition, the 1:3(Z:S) porous ZS ceramics increased the alkali-supply capacity and average cycling period of back-washing relative to 1:1(Z:S) porous ZS ceramics. The average removal efficiencies of heavy metals and sulfate ion from AMD by the 1:3(Z:S) porous ZS ceramics in the column reactor under the HRT condition of 24 hours were Al 97.2%, As 98.3%, Cd 89.9%, Cu 95.5%, Fe 99.5%, Mn 76.0%, Pb 97.5%, Zn 73.2%, and SO4 2- 75.9% during 71 days of operation time. The experimental results exhibited that the porous ZS ceramics in the column reactor system could function as an efficient media for the long-term treatment of heavy metals and sulfate ion from AMD.