• Proceedings of the Korean Environmental Sciences Society Conference
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• 2005.11a
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• pp.72-74
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• 2005

활성탄/폴리우레탄을 접목하여 복합담체를 개발하고 이를 biofilter 담체로 충전하여 기상스틸렌의 제거 특성을 살펴본 결과, EBCT 200 sec일 때 유입농도 200 ppm의 고농도에서도 100%의 제거율을 보일 뿐만 아니라 스틸렌의 유입농도를 150 ppm으로 공급하여 EBCT를 75 sec 까지 낮추어 운전하여도 80% 이상의 높은 제거율을 보였다. 또한 본 연구의 활성탄/폴리우레탄 복합담체를 사용한 biofilter 운전에서 최대제거용량이 30.4 g/m$^3$/hr로 산정되어 비교적 높은 제거용량을 보여주었다. 이에 활성탄/폴리우레탄 복합담체를 충전한 biofilter 기술이 스틸렌을 효과적으로 제거할 수 있음을 보였다.

• 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.

• KSBB Journal
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• v.18 no.5
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• pp.412-417
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• 2003

We first investigated basic characteristics of reticulated polyurethane (PU) foams as microbial carriers. In general, the specific surface area of PU foams increases with respect to decreasing pore sizes. However, the number of microbes adhered on the unit surface of reticulated PU foams decreases with respect to decreasing pore sizes. Thus, as a result of totally considering all effects such as apparent density, hydrolysis rate, and adhesion, we can know that PU foams with 45 PPI is the most appropriate microbial carrier. In this study, we can also investigate the effect of various physico-chemical surface treatments on the adhesion of microbes on the surface of PU foams. We used a chitosan treatment, a PEI (Polyethylene Imine) treatment, a xanthane treatment and a plasma treatment. As a result of comparing all surface treatments, the plasma surface treatment was the best.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.152-152
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• 2019

• Microbiology and Biotechnology Letters
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• v.42 no.3
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• pp.307-311
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• 2014

This study investigated the effects of polyurethane foam on continuous hydrogen production from mixed wastes. Molasses was co-fermented with non-pretreated sewage sludge in a sequencing batch reactor. The results indicated that the addition of polyurethane foams as a microbial carrier in the reactor mitigated biomass loss at HRT 12 h, while most of the biomass was washed out during the operation period with no carrier. There was a stable hydrogen production rate of $0.4L-H_2/l/d$ in the carrier-sequencing batch reactor. Suspended biomass in the carrier-reactor indicated it possessed the highest specific hydrogen production rate ($241{\pm}4ml-H_2/g\;VSS/d$) when compared to that of biomass on the surface ($133{\pm}10ml-H_2/g\;VSS/d$) or inner carrier ($95{\pm}14ml-H_2/g\;VSS/d$).

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2002.05b
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• pp.128-129
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• 2002

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2002.05b
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• pp.121-122
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• 2002

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.11b
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• pp.168-171
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• 2003

화산석/polyurethane 복합담체를 충전한 biofilter에서 ethyl acetate의 제거특성에 관한 연구결과는 다음과 같다. 공탑접촉시간(EBCT)을 30 sec로 운전시에는 ethyl acetate의 유입농도가 300 ppmv 이하에서는 100%의 제거효율을 나타내었다. 유입부하량에 따른 제거용량을 살펴보면 유입부하량이 160 g/m3/hr 이하일때는 유입부햐량과 제거용량과는 직선적인 관계를 보였으며 본 연구에서 ethyl acetate의 최대제거용량은 210 g/m3/hr으로 산정되었다.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.29-32
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• 2003

특수 기능성의 심물질이 평균직경 수 마이크로의 미소한 고분자막으로 둘러싸여 있는 담체를 마이크로 캡슐이라 한다. 이러한 마이크로 캡슐의 주요한 기능은 크게 두가지로 나뉘는데, 심물질을 외부환경으로부터 보호하는 것과 심물질을 외부환경에로 방출하는 속도를 조절하는 것이다. 폴리우레탄은 제조시의 분자조성에 의해 매우 광범위한 특성을 나타낼 수 있는 흥미로운 고분자로 특히, 폴리에테르 폴리우레탄은 우수한 물성, 감염에 대한 우수한 저항성, 그리고 뛰어난 혈액 및 생체 적합성 등으로 인해 많은 연구가 되어져 왔다. (중략)

• Journal of the Korea Organic Resources Recycling Association
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• v.17 no.2
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• pp.73-80
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• 2009

Biofilters use porous solid media to support microorganisms and allow access to the contaminants in the airflow. The characteristics of media used in biofilters vary greatly, and therefore it is important to select the appropriate media in order to obtain a large enough surface attachment area and uniform pore. This study was performed to compare hydrogen sulfide ($H_2S$) removal efficiencies of three biofilter media; coconut fiber, ceramic, and polyurethane. The biofilter packed with coconut fiber showed stable removal activity when inlet loading was changeable, and was restored rapidly when the moisture content decreased. However, the coconut fiber suffered from low durability. To cope with this problem a media of fibrinous polypropylene was developed to strengthen the durability of the coconut fiber. Biofilter column experiments using the fibrinous polypropylene media demonstrated over 99% of removal efficiencies at pH as low as 3 and 6 seconds of EBRT (empty bed gas residence time). Due to its superior physical characteristics, it is expected that the $H_2S$ treatment performance will increase when the new fibrinous polypropylne media is applied in commercial biofilter systems.