• Journal of the Korea Organic Resources Recycling Association
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• v.9 no.3
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• pp.136-144
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• 2001

Two organic materials, peat and rock wool were used for removal of $H_2S$ by a biofilter inoculated with night soil sludge. By gradually increasing the inlet load of $H_2S$, the complete removal capacity, which was defined as the inlet load of $H_2S$ that was complete removed, and the maximum removal capacity of $H_2S$, which was the value when the removal capacity leveled off for organic materials, were estimated. Both values for Rock wool are larger than peat, based on a unit dry weight of material. By using kinetic analysis, the maximum removal rate of $H_2S$, $V_m$, and the saturation constant, $K_s$, were determined for all packing materials and the values of $V_m$ for rock wool was found to be larger. By using the kinetic parameters, the removal rates for $H_2S$ were compared both packing materials, and rock wool showed better performance for the removal of $H_2S$ in the inlet concentration range of 0~200ppm.

• Applied Chemistry for Engineering
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• v.19 no.5
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• pp.519-525
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• 2008

Biodegradation of toluene, styrene and hydrogen sulfide as model compounds of volatile organic compounds and odor from waste gas was investigated experimentally in a biotrickling filter. This study focussed on the description of experimental results with regard to operating conditions. The effect of varying $H_2S$ load rate and inlet concentration was investigated under autotropic and mixotropic environmental conditions. The $H_2S$ removal efficiencies of greater than 99% were achieved at $H_2S$ loads below $10g/m^3{\cdot}hr$ for each environment. It was observed that the maximum elimination capacity of mixotrophic filter was achieved a little greater than the one of autotrophic filter. The biofiltration of toluene and styrene in trickling bed was examined under different gas flow rates, load rates, and inlet concentrations. Below $40g/m^3{\cdot}hr$ of toluene loading, the elimination capacity and loading were identical and it was completely destroyed. In high loading of toluene, the biotrickling filter was operated at its maximum elimination capacity. In the inlet concentration of 0.2, 0.5, and $1.0g/m^3$, the maximum elimination capacity of toluene showed 40, 45, and $60g/m^3{\cdot}hr$, respectively. After a short adaptation period, it was demonstrated that the results of styrene in originally toluene adapted bioreactor was similar with the ones of toluene. However, the performance of filer for styrene is generally a little lower than for toluene. The operating conditions (including liquid flow rate etc.) allowing the highest removal efficiency should be determined experimentally for each specific case.

• Journal of the Korea Organic Resources Recycling Association
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• v.26 no.4
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• pp.45-51
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• 2018

The objective of this study is to evaluate the applicability of a manhole-filter odor eliminator that is installed on a manhole to remove hydrogen sulfide ($H_2S$) contained in the sewage of urban streets; $H_2S$ is the very cause of offensive odor from such sewage. An analysis of the capability of impregnated activated carbon, which is contained in the manhole filter, to adsorb hydrogen sulfide shows that some 99.8% of hydrogen sulfide can be removed. A performance evaluation of the manhole-filter odor eliminator, which was made on Manhole Section 4 known as the representative malodorous manhole section of Seoul, Korea, indicates that more than 97% of hydrogen sulfide ($H_2S$), one of typical malodor-generating substances, can be eliminated. The results and findings of the study as described above suggest that the applicability of the manhole-filter odor eliminator to eliminate offensive odor generated from sewer manholes is satisfactory.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.177.2-177.2
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• 2011

폐기물 합성가스에 포함되어 있는 오염물질 중 황화합물($H_2S$, COS)이 존재할 경우, 다른 연계 공정을 구성하는 설비의 부식, 합성가스 이용 공정의 촉매 피독 문제, 대기 배출시 환경오염 문제 등을 야기 시키므로 제거가 필요하다. 고온 정제 공정을 적용하여 황화합물을 제거하기위해 산화아연을 이용한 고온 탈황 실험을 수행하였다. 고정층 반응기에 탈황제로 선정한 산화아연을 충진하고, 공간속도 $3,000h^{-1}$, 입구 황화합물의 농도 $H_2S$ 1,000ppm, COS 300ppm일 때 반응 온도 변화에 따른 탈황특성을 살펴보았다. 가스 내부에 $H_2S$가 단독으로 존재할 경우에는 $400^{\circ}C$ 이상에서 모두 제거되었으나, $H_2S$와 COS가 동시에 존재할 경우에는 $450^{\circ}C$ 이상에서 모두 제거되는 것을 알 수 있었다. 반응온도 $500^{\circ}C$에서 산화아연 탈황제를 이용한 실험결과 $H_2S$, COS의 파과시간은 각각 1,217, 1,063 min, 흡착능력은 269.9 mg-$H_2S$/g-sorbent, 124.7 mg-COS/g-sorbent으로 파악되었다.

• Applied Chemistry for Engineering
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• v.23 no.1
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• pp.23-27
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• 2012

To make synthetic liquid fuel from biomass such as wood pellet, energy crop and so on, a biomass to liquid (BTL) process by using a biomass gasifier with Fisher-Tropsch (FT) reaction was developed. However $H_2S$, COS and $CO_2$ in syngas from biomass gasifiers resulted in a decrease of the conversion efficiency and the deactivation of the catalyst. To remove acid gases in syngas, a lab-scale methanol absorption tower was developed and the removal characteristics of acid gases were investigated. The methanol absorption tower efficiently removed $H_2S$ and COS with a removal of $CO_2$, so it could be useful process for the BTL process.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.533-536
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• 2006

본 연구에서 biofilter를 이용하여 $H_2S$와 styrene의 혼합가스의 제거특성을 살펴본 결과, 먼저 biofilter의 담체로서 화산석이 충분히 활용될 수 있음을 보였고, 혼합가스의 수십 또는 수백배의 높은 농도에서 EBCT을 30 sec로 하여도 100%의 제거율을 보여 본 연구에 사용된 biofilter는 악취물질 제거에 효율적으로 적용될 수 있을 것으로 판단된다. 또한 혼합가스의 운전으로 pH는 저하되었지만 제거효율이 감소하는 현상은 발생하지 않았으며, 장기간의 운전에도 압력손실이 낮아 역세척이나 nutrient 공급을 조절할 필요가 없었다.

• Clean Technology
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• v.2 no.1
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• pp.69-79
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• 1996

Sulfur emission control in coal gasification plants implies the removal of $H_2S$ from the fuel gas in the gas clean-up system. In this study, the effects of particle size of sorbents, temperature of sulfidation and sorbent characteristics on the $H_2S$ removal efficiency of manganese ore were investigated. Experimental results showed that the removal efficiency of $H_2S$ was optimum when the temperature was about $700^{\circ}C$. And that the smaller particle size, the higher the $H_2S$ removal efficiency, but that was not effective very much. As the temperature increases, the reactivity of sorbents has lowered because agglomeration of sorbents increased the intraparticle transport resistance. This phenomenon was confirmed by SEM photographs. The equilibrium ratio ($P_{H_2O}/P_{H_2S}$) obtained by experiments is represented as a ${\log}(P_{H_2O}/P_{H_2S})=5653/T-3.7909$. It was showed that the natural manganese ore could be used as a sorbent because its capacity for $H_2S$ removal is equivalent to the eariler developed sorbents.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2001.05a
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• pp.211-216
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• 2001

수용액상에서 게 껍질에 의한 납 이온 제거시 납 이온 메카니즘을 규명하기 위하여 납이온 제거에 미치는 pH의 영향에 대해 조사하였다. 게 껍질에 의한 납 이온의 제거는 게껍질 내에 함유되어 있는 CaC $O_{3(S)}$의 용해에 따른 미세침전에 의한 제거가 대부분인 것으로 나타났다. pH가 증가하면 납 이온 제거량도 증가하였고 이온교환에 의해 발생되는 칼슘 이온의 유출은 납 이온 제거를 더욱 증가시키고 게 껍질 내의 $CO_{3}^{2-}$는 납 이온의 침투로 게 껍질 내부에 $PbCO_{3(S)}$ 형태의 복합체를 형성하는 것으로 판단되었다. 납 이온의 제거는 대부분 게 껍질 내 $PbCO_{3(S)}$의 용해로 인해 발생되는 $Pb_{3}(CO_{3}){2}(OH)_{2(S)}$와 $PbCO_{3(S)}$의 침전으로 이루어졌다. 수용액 중의 납 이온은 게 껍질 내 CaC $O_{3(S)}$의 용해를 가속화시키며 게 껍질 내부에서도 납 이온의 침전물이 발생하는 것으로 관찰되었다.

• Journal of Soil and Groundwater Environment
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• v.12 no.2
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• pp.37-46
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• 2007

This study developed composition-plastic media with woodchips and plastic as main materials, and examined the performance of media. Compared to the existing commercial media, the media had similar performance in removal efficiency and microbes attaching characteristic, and was evaluated that they are distinguished from economic side. Performance test of media was conducted to examine the removal capacity of toluene and hydrogen sulfide in a gas stream by using a lab-scale biotrickling filter systems packed with them. At a volumetric loading of $1.5\;m^3/hr$ with inlet concentration 260 ppm and empty bed residence time (EBRT) 42s, the toluene removal efficiency was shown over 90%, and the maximum elimination capacity of toluene in the biotrickling filter was $77g/m^3{\cdot}hr$. Effective co-treatments of $H_2S$ and Toluene were observed in the lab-scale biotrickling filters. The maximum elimination capacity of $H_2S$ was $100\;g-S/m^3{\cdot}hr$. Up to 100 ppm, the concentration of $H_2S$ did not have an effect on toluene removal efficiency, but the removal efficiency of toluene decreased with increasing inlet $H_2S$ concentration.

• Korean Journal of Environmental Agriculture
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• v.18 no.3
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• pp.292-297
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• 1999

This study was performed to estimate the possibility of use of plant materials as catalytic agents fur the decontamination of waste waters contaminated with organic pollutants by using 2,4-dichlorophenol(2,4-DCP) as a model pollutant. Plant materials containing high peroxidase activity were selected as catalysts for the removal of 2,4-DCP. Peroxidase activity, which plant materials were containing, was measured, and the greatest peroxidase activity was observed in shepherd's purse, followed by turnip, sweet potato, Chinese cabbage and white radish. The peroxidase activity in shepherd's purse was four times higher than that of horseradish purchased in U.S.A. Using shepherd' s purse and turnip, it was investigated the effect of various factors on the decontamination of 2,4-DCP through oxidative coupling. The removal of 2,4-DCP was extremely fast, and a maximal removal could be achieved within 3 min for shepherd' s purse and 15min for turnip. The pH range was from 3.0 to 8.0 and the amount of $H_2O_2$ added was 9mM when maximal removal was achieved(over 90%). No increasing removal of 2,4-DCP was observed due to increasing the amount of $H_2O_2$ added (over 9mM). The initial concentration affected the transformation of 2,4-DCP incubated with plant materials. When turnip was used as catalytic agent, it was observed decreasing transformation of 2,4-DCP due to increasing initial concentration.