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유목련 ( Mok Ryun Yu ),장윤영 ( Yoon Young Chang ),양재규 ( Jae Kyu Yang ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.4
In this study, Fe(VI) was applied to treat iron sulfide through oxidation of sulfide. Oxidation of FeS by Fe(VI) was studied at pH 9.2 with variation of the amount of FeS and the ionic strength at 10-4 M Fe(VI). Oxidation efficiency of FeS was evaluated by reduction efficiency of Fe(VI) with UV/VIS spectrophotometric analysis. Fe(VI) reduction increased as the amount of FeS increased. In order to discuss the kinetics of the Fe(VI) reduction, the data was fitted with the second-order rate expression. From the kinetic analysis, the second-order rate constant was determined as 4,940 L/mol/sec. Rate of Fe(VI) reduction by FeS gradually increased as the ionic strength increased. Reduction efficiency of Fe(VI) was quite similar without depending on the type of background electrolytes, except NaNO2 and Na2SO3. This result can suggest that fully oxidized anions such as ClO4-, NO3-, SO42-, PO43- as well as redox insensitive anion such as Cl- do not involve in the redox reaction between Fe(VI) and FeS.
유목련(Mok Ryun Yu),양재규(Jae Kyu Yang),김무늬(Mu Nui Kim),이승목(Seung Mok Lee),이남희(Nam Hee Lee) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.5
본 연구에서는 세 가지 다른 방법으로 제조된 망간사에 의한 용존 Mn2+의 제거특성을 회분식 및 칼럼실험을 통하여 조사하였다. 실험실 규모에서 망간의 주입농도를 달리하여 망간사 제조시, 모래에 코팅된 망간 코팅량은 주입된 망간 농도에 비례하여 나타났다. 망간사에 의한 용존 망간의 제거는 용액의 pH 증가에 따라 증가하는 양이온형 흡착경향을 따랐다. 흡착을 통한 용존 망간의 제거는 망간사 코팅방법 및 코팅량에 거의 영향을 받지 않고 모든 pH 영역에서 유사하게 나타났다. NaClO를 산화제로써 주입하였을 때 망간사에 의한 용존 망간의 제거는 NaClO 농도에 비례하였다. 이러한 결과는 NaClO 주입농도 증가에 따라 용존 망간이 망간산화물로 산화되고 이때 생성되는 산화망간이 망간사 표면으로의 코팅이 증가되어 나타난 현상으로 여겨진다. 칼럼반응기를 이용한 용존 망간제거 실험에서, NaClO를 주입하지 않은 경우에는 4,100 bed volume 이 후 망간의 파과가 이루어졌지만, NaClO를 주입하였을 경우에는 파과가 1.6배 지연되어 나타나서 산화제를 사용하는 것이 용존 망간의 제거율을 높이는 것임을 또한 확인할 수 있었다. Manganese-Coated Sand(MCS) prepared with three different methods were applied in the treatment of soluble Mn2+ in batch and column experiments. In the bench-scale MCS preparation, the coating efficiency of manganese on the surface of sand increased as the dosage of initial Mn(II) increased. The removed amount of the soluble Mn2+ by MCS increased as the solution pH increased, following a typical anionic-type adsorption. The removed amounts of the soluble Mn2+ through adsorption was quite similar over the entire pH range, without depending on the contents of Mn on the surface of sand as well as coating methods. When NaClO was used an oxidant, the removed amount of the soluble Mn2+ by MCS increased as the concentration of NaClO increased, This trend might be explained by the increased removal efficiency through coating of manganese oxides produced from oxidation of the soluble Mn2+ by NaClO on the surface of MCS. From the bench-scale column experiments, the breakthrough of Mn2+ occurred after 4,100 bed volume without presence of NaClO while 1.6-times delayed breakthrough of Mn2+ was observed in the presence of NaClO. This result also supports that the removal efficiency of the soluble Mn2+ could be enhanced by using NaClO.
망간첨착 활성탄의 다기능성을 이용한 3가 비소 및 페놀 제거
유목련,홍순철,양재규,장윤영,Yu, Mok-Ryun,Hong, Soon-Chul,Yang, Jae-Kyu,Chang, Yoon-Young 한국지하수토양환경학회 2008 지하수토양환경 Vol.13 No.3
여러 조건으로 제조한 망간첨착활성탄(Mn-AC)을 유기물과 무기물이 함께 오염되어 있는 합성 폐수처리에 적용하였다. 유기물과 무기물의 대표물질로 각각 페놀과 3가 비소를 선정하였다. Mn-AC의 물리화학적 특성과 안정성을 분석한 후, 회분식 반응조에서 활성탄(AC) 및 Mn-AC에 의한 3가 비소 및 페놀 흡착 특성을 조사하였다. Mn-AC의 안정성 평가를 위해 pH 2에서 4의 산성용액에서 용출되는 망간의 농도로부터 평가하였다. pH 3 이하에서는 Mn-AC로부터 많은 양의 망간이 용출되었지만, pH 4에서는 청정지역 허용기준인 3 ppm 이하의 농도로 용출되었다. Mn-AC에 대한 X-선 회절기 분석결과 첨착된 망간은 $Mn_2O_3$로 밝혀졌다. Mn-AC를 이용한 3가 비소와 페놀의 동시처리 실험결과 3가 비소는 낮은 pH에서 AC보다 높은 산화율을 보였으나, 중성 이상의 pH에서는 AC가 더욱 높은 산화율을 보였다. 활성탄에 망간을 첨착시킴으로서, 비표면적이 13% 감소하였고 이로서 Mn-AC에 의한 페놀제거율은 AC에 비해 8% 정도 줄어들었다. 3가 비소 산화 및 페놀 흡착실험을 통하여 Mn-AC는 복합오염물을 갖는 폐수의 동시처리에 적용될 수 있음을 알 수 있었다. Mn-impregnated activated carbon (Mn-AC) prepared at different conditions was applied in the treatment of synthetic wastewater containing both organic and inorganic contaminants. Phenol and As(III) was used as the representative organic and inorganic contaminants, respectively. After evaluation of the physicochemical characteristic and stability of Mn-AC, oxidation of As(III) as well as adsorption of phenol by activated carbon(AC) and Mn-AC were investigated in a batch reactor. To investigate the stability of Mn-AC, dissolution of Mn from each Mn-AC was measured pH ranging from 2 to 4. Although Mn-AC was unstable at a strong acidic condition, the dissoluted Mn was below 3 ppm at pH 4. XRD analysis of Mn-AC indicated that the mineral type of the impregnated manganese was $Mn_2O_3$. From the simultaneous treatment of As(III) and phenol by AC and Mn-AC, As(III) oxidation by Mn-AC was greater than that by AC at lower pH, while the reverse order was observed at higher pH. After impregnation of Mn onto AC, 13% decrease of the surface area was observed, causing 8% reduction of phenol removal. Considering removal properties of As(III) and phenol, Mn-AC could be applied in the simultaneous treatment of wastewater contaminated with multi-contaminants.