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宋在峻 木浦大學校 沿岸環境硏究所 1994 沿岸環境硏究 Vol.11 No.1
This paper was concentrated on estimating the possibility of application of biological fluidized bed to the low concentrated wastewater treatment and reuse. This study were conducted by continuous type rectors at HRT 1hr, 2hr, 3hr and F/M ratio from 0.2 to 0.4/day. The results obtained were as follows. 1. As a results of the treatment of the low concentrated wastewater of influent BOD 70-94㎎/l, BOD removal ratios coulde be reached to 94% at HRT 1hr. 2. Treatment efficiency by BFB of low concentrated wastewater was nearly same even if in case of F/M ratio variation of 0.2 to 0.4 regardless of F/M ratio. 3. As a prevent to anaerobic state and increased oxygen transfer rate, the air lift pump is effiency. 4. A results of the treatment of the low concentrated wastewater by BFB is that the industrial water is the first class and the drinking water is the third class, therefore, it could be reuse.
스트럿을 가진 PSC 박스거더교의 FRP 외양관 적용성 평가를 위한 실험연구
송재준,황윤국,이영호,이승혜 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 논문집 Vol.13 No.1
최근 건설구조물에 대한 FRP의 활용에 관한 연구가 활발히 진행되고 있다. FRP는 단위중량당의 강도와 강성이 기존 건설재료인 강재나 콘크리트에 비해 매우 크고, 부식에 대한 저항성이 뛰어나는 등의 여러 가지 물리적, 화학적 장점이 있다. 이러한 장점을 이용하여 FRP 외양관을 단면의 효율성을 극대화할 수 있고 경제성과 경관에 매우 효과가 큰 스트럿을 가진 PSC 박스거더교의 스트럿 부재의 피복재로 적용하고자 한다. 본 논문에서는 스트럿을 가진 PSC 박스거더에 사용되는 FRP 외양관의 적용성을 평가하기 위하여 이와 관련한 FRP 외양관의 시편실험과 FRP로 피복된 콘크리트 부재의 압축실험을 수행하였으며, 실험결과로부터 콘크리트 강도와 에너지 흡수능력 및 연성이 증진되어 스트럿 부재로써 충분한 안전성을 확보할 수 있음을 확인하였다 In recent, the investigations related to the FRP(Fiber Reinforced Polymers) have been increased due to their superior material and mechanical properties such as environmental resistance, high specific strength and stiffness. Considering these advantages, the FRP tube may be proper for strut on the PSC box girder bridge that can maximize the efficiency of cross section and are effective on economics and aesthetics of bridges. In this research, the specimen tests of the FRP tube and compression tests of the concrete member enclosed with the FRP were performed in order to evaluate the suitability of the FRP tubes, which are applied to the PSC box girder bridge with strut. The specific strength of concrete and the energy absorbing capacity as well as ductility were increased according to the experimental results, and it was found that FRP tubes have sufficient safety as strut member