• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2000.04a
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• pp.19-22
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• 2000

• Korean Chemical Engineering Research
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• v.45 no.4
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• pp.372-377
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• 2007

In order to assess its capability as biofilter bed material under variable conditions of two parameters (inlet gas concentration and inlet gas flow rate), reticulated polyurethan was applied to remove hydrogen sulfide via a biological process. We detected a maximal elimination capacity (critical loading rate) of $488.3(330.1)g-H_2S/m^3{\cdot}hr$, when reticulated polyurethane was employed as supporting material of biofilter. This study show that the application of reticulated polyurethane carrier might be a favorable choice as a packing material in biofilter for the biological removal of hydrogen sulfide.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.457-460
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• 2007

석탄가스화 기술은 석탄을 고온/고압 조건에서 가스화 반응시켜 CO와 $H_2$가 주성분인 합성가스(syngas)로 전환시키는 기술이다. 그러나 가스화 반응으로 인해 합성가스 내에는 불순물인 $H_2S$, COS, $NH_3$ 등의 오염 물질이 발생하게 되며, 가스터빈의 부식, 촉매의 피독, 전극의 성능 저하 현상 등을 일으켜 효율을 저하시키게 된다. 이에 본 연구에서는 FeMgO 촉매를 제거용매로 사용하여 $H_2S$를 효과적으로 제거하기 위하여 Lab-scale 탈황 설비를 제작하였으며, 석탄 가스화 운전에 연계하여 합성가스 내 포함된 산성가스 정제 특성에 관한 연구를 진행하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.339-345
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• 2007

이번 연구에서는 pH 조작이 어려운 소규모 하수 처리장에서의 BNR 슬러지의 접종으로 인한 SBR start-up시 영양 염류 제거 특성 및 변화를 관찰 하였다. 1) 글루코즈를 탄소원으로 사용한 유기물 제거에 있어서 모두 85%이상의 높은 제거 효율을 보였으나 BNR 슬러지 접종 비율이나 유무에 따른 SBR의 유기물 제거에 미치는 영향은 미비한 것으로 나타났다. 2) 유입비율에 따라 암모니아 제거 효율은 BNR 슬러지 첨가 유무에 따라 바뀌었으며, 비율에 상관없이 첨가된 반응조는 7일 이내 $82{\sim}98%$에 달하는 제거율을 보였다. 3) 인 제거효율에 있어서는 유입비율에 따라 인 제거 효율이 증가하였으며, 첨가와 미첨가의 차이는 25%이상의 인 방출량 차이를 나타내었다. 4) 첨가한 BNR 슬러지의 비율이 전체의 40%이상일 때는 50%일 때와 큰 차이를 보이지 못했다. 5) FISH를 통하여 미생물 군집을 확인하였고 각 미생물들 간의 상대적인 비율과 heterotroph의 급격한 증식을 확인할 수 있었다. 6) pH, DO, ORP graph를 통한 Reactor의 실시간 조정 가능성을 볼 수 있었다. 7) BNR 슬러지를 접종하지 않을 경우, PAOs와 질산화 미생물의 성장이 더뎌 영양염류 제거가 어려웠다.

• KSBB Journal
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• v.19 no.3
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• pp.200-205
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• 2004

For decolorization of various reactive dyes, 13 species of microbes were isolated from dyeing wastewater collected from Banweol industrial complex, Korea. Two strains among them showed good ability for removing celerity during the decolorization test with 5 different reactive dyes. And the optimal growth conditions were pH 7, 35$^{\circ}C$, yeast extract as nitrogen source, glucose as carbon source, and facultative anaerobic condition. As results, when Reactive Red 180 was used, 89 and 87% of decolorization efficiency were able to be obtained by using Bacillus anthracis and Bacillus cereus, respectively. Especially, Bacillus cereus showed good ability for decolorization of Reactive Blue 21, and the ratio was 76% Finally, it was considered that these two strains isolated in this study will be showed high decolorization ability to treat dyeing wastewater.

• KSBB Journal
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• v.16 no.3
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• pp.286-289
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• 2001

A beterotrophic Pseudomonas putida B2 was used to treat of hydrogen sulfide containing gas. The experimental approach involved operating two indentical bench-scale biofilters with media consisting of a mixture of peatmoss, perlite and granular activated carbon(GAC). One column was seeded with Pseudomonas putida B2 and the other was left unseeded. The biofilter was operated for 16 days under EBRT for 20-40 sec, at a temperature of 25-30$^{\circ}C$ and a hydrogen sulfide concentration of 40-190 ppm. The biofilter inocculated with P.putida B2 exhibited high hydrogen sulfide removal efficiency, average of 95%, at a gydrogen sulfide concentration of 40-190 ppm (flow rate 3.6 L/min). However, at a shock loading of 190 ppm the biofiter showed a removal efficiency of 78.9% and the control only showed a removal efficiency of 31.6%. The critical load of this biofilter was 14.83 g/㎥hr, and the critical load of the control column was 4.93 g/㎥hr. These results suggest that P. putida B2 has the potential to be used as a $H_2S$ removal agent in a biofilter.

• Journal of Energy Engineering
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• v.25 no.1
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• pp.171-176
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• 2016

Sour gas is natural gas or any other gas containing significant amounts of hydrogen sulfide ($H_2S$). Natural gas is usually considered sour gas if there are more than 5.7 milligrams of $H_2S$ per cubic meter of natural gas, which is equivalent to approximately 4 ppm by volume under standard temperature and pressure We have surveyed on the treatment and removal technology of sour gas, sour gas include a lot of hydrogen sulfide($H_2S$), Carbon dioxide($CO_2$), utane($C_4H_{10}$) and mercaptan($C_nH_{4n-1}SH$) etc. We need high technology for development for these kinds of raw gases and we should specially take care of treating and removal of theses raw gases. Therefor we are going to describe about these kinds of raw gases and about methods how to treat these kinds of gases.

• Economic and Environmental Geology
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• v.34 no.3
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• pp.301-306
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• 2001

Column tests were conducted to investigate the optimal condition of surfactant solution pH that can affect the removal efficiency in surfactant-assisted remediation. Toluene and 1,2,4-trichlorobenzene were chosen as the model hydrophobic substances. Two Iowa soils, Fruitfield sand and Webster clay loam, were leached with solutions of 4%(v/v) sodium diphenyl oxide disulfonate (DOSL, trade name Dowfax 8390), or 4%(v/v) trideceth-19-carboxylic acid (TDCA, trade name Sandopan JA36), or 4% (v/v) octylphenoxypoly ethoxyethanol (OPEE, trade name Triton X100). The test results revealed that a maximum removal of toluene and 1,2,4-trichlorobenzene was obtained at pH 10 of surfactant solution, and maximum recoveries of added toluene (94%) or 1 ,2,4- trichlorobenzene (97 %) were obtained for DOSL surfactant solution in Fruitfield sandy soil column. Increased removal efficiency by pH control of both toluene and 1,2,4trichlorobenzene was 16% and 20% for DOSL with Fruitfild sandy soil, respectively. In addition, the maximum recoveries of added toluene or I ,2,4-trichlorobenzene were 89% and 93% for DOSL surfactant solution in Webster clay loam soil column. The maximum increase of toluene and 1,2,4-trichlorobenzene removal was 26% and 19% for DOSL with Webster clay loam soil, respectively. These experimental results indicate that maintaining a high pH surfactant solution in surfactant-assisted remediation is desirable for efficient removal of NAPLs from contminated soils.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.116-116
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• 2011

바이오 가스 플랜트의 혐기소화 공정에서 발생하는 바이오 가스는 중 유해가스인 황하수소($H_2S$)는 부식성 가스로 수천 PPM농도를 함유하여, 발전기나 가스보일러로 이용하는 경우에는 $H_2S$를 제거하는 탈황공정이 반드시 필요하다. 탈황방식에는 산화철 탈황(건식 탈황)과 생물 탈황이 현재 많이 사용되고 있어나 산화철 탈황은 산화철 pellet이 유화철에 변화하면 탈황능력이 저하되어 pellet을 교환해야 하며 많은 비용이 발생한다. 생물 탈황 방식은 유황산화세균의 서식활동조건(온도, 반응시간, 산소량)확보가 반드시 필요하여 높은 운전기술을 필요로 한다. 본 연구에서는 바이오가스 전처리 기술 중 활성탄 또는 약액을 이용한 기존의 탈황정제방식보다 흡착성능이 뛰어난 이온교환섬유를 이용하여, 황화수소($H_2S$)를 95% 이상 제거할 수 있는 고효율 섬유상 이온촉매 악취제거 시스템 개발을 수행하였다. 이온교환섬유는 방사선 조사를 이용하여 부직포에 라디칼을 인위적으로 형성시켜(그라프트 중합) 양이온 또는 양이온을 교환할 수 있도록 제조된 섬유상의 흡착제로, 이온교환 섬유의 화학적 이온교환과 물리적 흡착 및 탈착반응이 동시에 발생되고, 활성탄/실리카켈 보다 흡착능력이 2~4배 높다. 또한 이온섬유의 재생기능을 이용하여 장기적 다양한 악취($H_2S$, $NH_3$, 아민계, 메르갑탄류, 알데히드 등) 및 유해가스(VOCs, NOx, SOx) 등을 95% 이상 제거할 수 있다.

• Journal of Environmental Health Sciences
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• v.20 no.1
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• pp.62-67
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• 1994

Introduction : Recently, water and environmental pollution becomes serious social problem and high technology makes this pollution accelerate. Hydrogen sulfide, the main subject of our research, is one of the most dangerous air pollutant like SO$_x$ and NO$_x$. The major contaminant in coal gasification is H$_2$S, which is very toxic, hazardous and extremely corrosive. Therefore, control of hydrogen sulfide to a safe level is essential. Although commercial desulfurization process called liquid scrubbing is effective for removal of H$_2$S, it has drawbacks, the loss of sensible heat of the gas and costly wastewater treatment. Many investigations are carried out about high-temperature removal ol H$_2$S in hot coal-derived gas using metal oxide or mixed metal qxide sorbents. It was reported that ZnO was very effective sorbent for H2S removal, but it has big flaw to vaporize elemental zinc above 600\ulcorner \ulcorner As alternative, metal oxides such as CaO, $Fe_2O_3$, TiO$_2$ and CuO were added to ZnO. Especially, different results are reported for $Fe_2O_3$ additive. Tamhankar et al. reported SiO$_2$ with 45 wt% $Fe_2O_3$ sorbent is favorable for removal of H$_2$S and regeneration.