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• W2499965068 abstract "생물학적 처리방법인 biofiltration을 이용하여 1차 기질 toluene의 존재여부에 따른 TCE와 PCE의 제거율을 비교하였다. 그리고 TCE와 PCE의 제거과정에 관련된 미생물의 군집변화를 조사하였다. TCE와 PCE혼합증기 제거율을 순치시킨 슬러지를 메디아 표면에 부착한 biofilter B를 이용해서 1차 기질로서 toluene증기 공급이 없는 상태에서 TCE/PCE 혼합증기제거율을 조사하고 또한 toluene증기로 순치시킨 슬러지를 부착한 별도의 biofliter A에서 1차 기질로서 toluene증기를 공급하는 상태에서 TCE/PCE 혼합증기의 제거율을 조사한 결과 (i) biofilter운전초기에는 PCE제거율이 TCE제거율보다 현저히 높지만, biofilter운전 지속기간의 증가에 따라 두 물질의 제거율이 증가하다가 나중에는 두 가지 물질의 제거수준이 비슷해진 상태에서 정체되는 경향이 있고, 1차 기질로서 toluene증기를 공급하지 않은 경우가 공급한 경우보다 현저히 TCE/PCE 제거율이 높으며, 두 물질의 생물여과에 의한 제거율이 동등수준에 도달하는 시간이 1차 기질을 공급하는 경우에 공급하지 않는 경우보다 빠르게 도달하였다. 이 실험은 (ii)일부의 toluene 분해 미생물이 TCE와 PCE 증기 등 염소화 휘발성 유기물 증기의 분해에도 관여하고, TCE/PCE 증기의 생물학적 저감과정에서 공동대사가 반드시 필요하지는 않는 것임을 시사한다. DGGE밴드의 16S rDNA의 염기서열을 결정한 결과 (i) uncultured alpha proteobacterium, uncultured Desulfitobacterium sp., uncultured Rhodobacteraceae bacterium, Cupriavidus necator, Pseudomonas putida 등이 toluene 분해 미생물들이었고 (ii) alpha proteobacterium HTCC396이 TCE 제거미생물이고, (iii) Desulfitobacterium sp.이 PCE 분해에 관여하는 것으로 추정된다. (iv) 특히 uncultured Desulfitobacterium sp.은 toluene뿐만 아니라 다양한 염소계 화합물을 제거시킬 수 있는 미생물임이 확인되었다. 【The removals of TCE and PCE vapor with or without a supply of toluene as a primary substrate were compared in a biofiltration process, and the variations of microbial communities associated with the removal were also investigated. As a result of investigations on the removals of TCE/PCE in a biofilter B within which TCE/PCE-acclimated sludge was attached on the surface of media without a supply of primary substrate, and those in another biofilter A where toluene-acclimated sludge was attached with a supply of toluene as a primary substrate, followings were found: (i) parts of microbes responsible to the decomposition of toluene vapor participate in the removal of chlorinated VOCs such as TCE and PCE, and (ii) effective biological removals of TCE and PCE vapor do not necessarily need cometabolism. Sequencing of 16S rDNA obtained from the band profile of DGGE (Denaturating Gradient Gel Electrophoresis), it was confirmed that: (i) uncultured alpha proteobacterium, uncultured Desulfitobacterium, uncultured Rhodobacteraceae bacterium, Cupriavidus necator, and Pseudomonas putida were found to be toluene-decomposing microbes, (ii) alpha proteobacterium HTCC396 is a TCE-removing microbe, (iii) Desulfitobacterium sp. is a PCE-decomposing microbe, and (iv) particularly, uncultured Desulfitobacterium sp. is probably a microbe decomposable not only toluene but also various chlorinated VOC vapor including TCE and PCE.】" @default.
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• W2499965068 title "생물 여과를 이용한 TCE/PCE제거 및 DGGE법을 이용한 관련미생물 군집변화에 관한 연구" @default.
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