망간모래여과를 이용한 강변여과수의 망간제거

김충환 ( Chung Hwan Kim ),김학철 ( Hak Chul Kim ),김한승 ( Han Seung Kim ),김범수 ( Berm Soo Kim ),안효원 ( Hyo Won Ahn ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5

Pilot-scale experiments were performed for the treatment of bank filtrate containing high manganese concentration around 2 ㎎/L using rapid manganese sand filtration to investigate effects of oxidant dose and pH control on the removal efficiency of manganese. For theoretical dose ranges of oxidant (sodium hypochlorite) between 3 and 4 ㎎/L, the manganese concentration of effluent was 0.57 ㎎/L, which corresponded to 72.5% removal and was higher than drinking water quality standards of 0.3 ㎎/L. For excess dose ranges of oxidant between 4 and 8 ㎎/L, the manganese concentration of effluent was reduced to 0.14 ㎎/L, which corresponded to 94.5% removal, but the residual chlorine concentration was over 1.0 ㎎/L. On the other hand, manganese removal efficiency drastically increased up to the value of 98.0%, which is equivalent to the effluent concentration of 0.03 ㎎/L by controling pH to the range between 7 and 8 for the theoretical dose of oxidant. Consequently, these results indicated that appropriate dose of chemicals, such as oxidant and alkali, and continuous monitoring of manganese should be necessary to obtain efficient removal of manganese and to optimize the maintenance of treatment facilities for the treatment of bank filtrate with high concentration of manganese.

광산배수 처리시설 사여과조에서 생성된 망간산화물 피복모래(MCS)를 이용한 수중 망간 흡착 기초 연구

지상우,조동완,임길재,안종만,안기오,장정윤,정영욱 한국자원공학회 2020 한국자원공학회지 Vol.57 No.3

This study tested the feasibility of using manganese-oxide coated sand (MCS) collected in a mine drainage treatment facility, for the adsorption of Mn(II) in the aqueous solution. Na-birnessite was detected as the main mineral phase on the surface of MCS. The Mn(II) adsorption characteristics of MCS were evaluated using a series of parameters including initial pH, reaction time, and initial concentration. The pH of the reacted solutions converged to pH 6.19±0.04 when the initial values were above 5; the adsorption amount leveled off at 1.47±0.11 mg/g. The maximum adsorption amount was found to be 1.402 mg/g in the Langmuir model fitting results. The KF constant calculated by the Freundlich model was 0.645 and the adsorption strength (n) was 5.225. As a result, it can be concluded that the filter sand naturally coated by Na-birnessite in the treatment facility possesses the outstanding ability to remove dissolved manganese present in the wastewater. 본 연구에서는 광산배수 처리시설의 사여과조에 형성된 망간산화물 피복모래(manganese-oxide coated sand, MCS)를 흡착제로 활용하기 위한 기초실험을 수행하였다. XRD 분석결과 MCS의 표면에 피복된 망간산화물은 Na-Birnessite인 것으로 나타났다. pH, 반응시간 및 초기농도를 다르게 한 흡착 특성 실험을 수행하였다. 실험 결과 pH 5이상에서 pH는 6.19±0.04로 수렴하였고, 흡착량은 1.47±0.11 mg/g의 흡착량을 보였다. 흡착속도 모델 결과에서는 반응속도가 매우 느린 것으로 나타났다. Langmuir 모델에 의해 도출된 최대 흡착량은 1.402 mg/g 이었으며, Freundlich 모델에서 KF은 0.645, 흡착강도(n)는 5.225로 흡착능력이 우수한 것으로 나타났다. 연구결과, 광산배수 처리시설에서 자연스럽게 Na-birnessite로 피복된 여과사는 폐수 중에 존재하는 용존 망간 제거에 우수한 능력을 갖는 것으로 평가된다.

소성 및 접촉건조 방식에 의해 제조된 망간코팅사의 물리화학적 특성 비교

장윤영(Yoon Young Chang),김병권(Byeong Kwon Kim),홍순철(Soon Chul Hong),서은옥(Eun Ok Seo),양재규(Jae Kyu Yang) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.11

본 연구에서는 접촉 및 건조 방법으로 만든 망간사의 물리화학적 특성을 기존의 소성처리 방법으로 만들어진 망간사의 그것과 비교하였다. 접촉 및 건조방법을 사용하여 망간사를 제조할 때에 모래 입경별 및 접촉시간을 제조변수로 하였으며 접촉 및 건조방법에 의한 망간사 제조시의 최적조건은 망간 코팅효율, 제조시간, As(III)에 대한 산화효율로부터 도출하였다. X-선 회절분석을 통하여 접촉 및 건조방법에 의해 제조된 망간사 표면의 산화망간에 대한 광물 분석결과를 JCPDS 자료와 비교한 결과 β-MnO₂와 γ-MnO₂의 혼합물인 것으로 판명되었다. 접촉 및 건조방법으로 제조한 망간사는 기존의 소성처리 방법으로 제조한 망간사에 비해 As(III) 산화효율은 유사하지만 코팅된 망간의 안정성이 보다 큰 것으로 나타났다. 접촉 및 건조방법은 코팅된 망간함량, 코팅된 망간의 안정도 그리고 As(III)에 대한 산화성능 등을 고려할 때 기존의 망간사 제조방법을 대체할 수 있는 우수한 제조공정으로 나타났다. Physicochemical characteristics of the manganese-coated sand(MCS) prepared by wetting and dry(W&D) method were compared with that by baking method, which is previously used. Particle sizes of the sand and wetting times were used as variables in the preparation of MCS and an optimum condition for the preparation MCS by W&D was determined from the coating efficiency, preparation time and oxidation efficiency of As(III). Comparing the X-ray diffraction spectroscopy(XRD) peak information of manganese oxide prepared by W&D method with the JCPDS file, the peaks were identified as the mixture of β-MnO₂ and γ-MnO₂. The MCS prepared by W&D method showed similar oxidizing powers to As(III) compared to that by baking method. However, the stability of the manganese on MCS prepared by W&D method was greater than that by baking method. From this work, wetting and dry was identified as an efficient preparation method in the view point of coated amount of manganese on sand, stability of coated manganese and oxidation efficiency of As(III).

망간사에 의한 망간제거 특성 평가

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.

철 및 망간코팅사를 분리 충진시킨 파일럿 여과시스템에 의한 3가 비소 제거

김광섭(Kwang Seob Kim),송기훈(Ki Hoon Song),양재규(Jae Kyu Yang),장윤영(Yoon Young Chang) 大韓環境工學會 2006 대한환경공학회지 Vol.28 No.8

철 및 망간코팅사 충전비를 달리한 여과시스템에서 3가 비소 제거의 최적 조건

장윤영(Yoon Young Chang),김광섭(Kwang Seob Kim),송기훈(Ki Hoon Song),양재규(Jae Kyu Yang) 大韓環境工學會 2006 대한환경공학회지 Vol.28 No.11

강변여과수 처리를 위한 포기-모래여과공정에서 망간제거 기작에 관한 연구

최승철,김세환,양해진,임재림,왕창근,정관수 대한상하수도학회 2010 상하수도학회지 Vol.24 No.3

It is well known that manganese is hard to oxidize under neutral pH condition in the atmosphere while iron can be easily oxidized to insoluble iron oxide. The purpose of this study is to identify removal mechanism of manganese in the D water treatment plant where is treating bank filtered water in aeration and rapid sand filtration. Average concentration of iron and manganese in bank filtered water were 5.9 mg/L and 3.6 mg/L in 2008, respectively. However, their concentration in rapid sand filtrate were only 0.11 mg/L and 0.03 mg/L, respectively. Most of the sand was coated with black colored manganese oxide except surface layer. According to EDX analysis of sand which was collected in different depth of sand filter, the content of iron in the upper part sand was relatively higher than that in the lower part. while manganese content increased with a depth. The presence of iron and manganese oxidizing bacteria have been identified in sand of rapid sand filtration. It is supposed that these bacteria contributed some to remove iron and manganese in rapid sand filter. In conclusion, manganese has been simultaneously removed by physicochemical reaction and biological reaction. However, it is considered that the former reaction is dominant than the latter. That is, Mn(II) ion is rapidly adsorbed on γ-FeOOH which is intermediate iron oxidant and then adsorbed Mn(II) ion is oxidized to insoluble manganese oxide. In addition, manganese oxidation is accelerated by autocatalytic reaction of manganese oxide. The iron and manganese oxides deposited on the surface of the sand and then are aged with coating sand surface.

Immobilized Small Sized Manganese Dioxide Sand in the Remediation of Arsenic Contaminated Water

Diwakar Tiwari,C Laldawngliana,Seung Mok Lee 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.1

Small sized manganese dioxide particles are immobilized onto the surface of sand by the wet impregnation process. The surfacemorphology of the solid, i.e., immobilized manganese dioxide natural sand (IMNS) is performed by taking scanning electron microscope images and characterized by the X-ray diffraction data. The specific surface area of the solid is obtained, which shows a significant in crease in the specific surface area obtained by the immobilization of manganese dioxide. The pH PZC (point of zero charge) is found to be 6.28. Further, the IMNS is assessed in the removal of As(III) and As(V) pollutants from aqueous solutions under the batch and columnoperations. Batch reactor experiments are conducted for various physicochemical parametric studies, viz. the effect of sorptive pH(pH 2.0-10.0), concentration (1.0-25.0 mg/L), and background electrolyte concentrations (0.0001-0.1 mol/L NaNO₃). Further, columnexperiments are conducted to obtain the efficiency of IMNS under dynamic conditions. The breakthrough data obtained by the columnexperiments are employed in non-linear fitting to the Thomas equation, so as to estimate the loading capacity of the column for As(III)and As(V).

논문 : 2단 망간모래여과에 의한 고농도 망간 처리

김충환 ( Chung H. Kim ),윤종섭 ( Jong S. Yun ),임재림 ( Jae L. Lim ),김성수 ( Seong S. Kim ) 대한상하수도학회 2007 상하수도학회지 Vol.21 No.4

Biofilter와 망간모래여과의 정수처리 특성

김홍태 ( Hong Tae Kim ),장정훈 ( Jung Hun Jang ),최혁순 ( Hyeok Sun Choi ) 한국수처리학회 2007 한국수처리학회지 Vol.15 No.3