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권동민(Dong Min Kwon),이병헌(Byung Hun Lee),박은정(Eun Jung Park) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.1
In the water treatment plant, chemical treatment process is increasingly used for reducing such impurities as suspended solids and organic materials. Many water treatment plants has been adapted chemical treatment process using alum as a primary coagulant. The use of alum is producing a waste commonly called alum sludge. Alum sludge is a bulky gelatinous substance composed of aluminium hydroxides, inorganic particles such as clay or sand, colloids, microorganisms, etc. It has relatively low solid content that is difficult to thicken and dewater. This study attempted to investigate the effect of thickening and dewatering of alum sludge in Duk-san water treatment plant through pretreatment using sulfuric acid, lime and polyacrylamide. The main results obtained in this study are summarized as follows: In case of alum sludge pretreated by sulfuric acid, the effect of thickening increased with proportion to concentration of aluminium extracted, while the dewaterability was mainly affected by the extraction ratio of aluminium and TOC concentration. Alum sludge pretreated by lime enhanced both thickening and dewaterability. It appeared that extracted aluminium and organics were adsorbed to non-dissolved lime and removed by co-precipitation. The thickening velocity and dewaterability increased by dosing polyacrylamide but the final effect of thickening was not appeared.
硏究論文 : 식생섬에 의한 중수처리 효과 검증과 적용에 관한 연구
권동민 ( Dong Min Kwon ),권순효 ( Soon Hyo Kwon ),구본학 ( Bon Hak Koo ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.6
This this study was conducted with the aim of doing experiment on the effect of water purification by using an artificially built plant island, which is one of the eco-techniques, and aquatic plants as a plan for the reuse of water for obtaining water resources, thereby analyzing the removed quantity, and applying the experimental results to the reuse of water. As a result of doing experiments, this study obtained a good measured value of BOD (biochemical oxygen demand) 4.7mg/L, and COD (chemical oxygen demand) 7.2mg/L below the heavy water standard of BOD 10mg/L and COD 20mg/L, respectively. The chromaticity showed 89.2% removal efficiency, but final treated wastewater was found to show chromaticity 58 degrees exceeding chromaticity 20 degrees which are the water quality standard of the reuse of water. The results revealed that T-N produced 27% removal efficiency on an average while T-P produced 38% removal efficiency on an average, showing that the removal effect of N & P wasn`t big. According to the currently enforced『Water Quality Standard of Heavy Water by Use』, the use of water for sprinkling and landscaping was found to be available. Accordingly, this study suggested a nature-friendly, economically-efficient, and eco-technological water treatment technique which will make it possible to overcome the limit of the existing physio-chemical water treatment technology, reduce the costs for maintenance and facilities, and also reduce the limit of space restraint for installation of facilities.
신경회로망을 이용한 Example-based 고해상도 영상 복원
권동민(Dong-Min Kwon),조성원(Seong-Won Cho),기선호(Sun-Ho Ki),정선태(Seon-Tae Jung) 한국지능시스템학회 2008 한국지능시스템학회 학술발표 논문집 Vol.18 No.2
해상도 확장, 즉 고해상도는 픽셀을 기본으로 하는 이미지에서 저해상도 이미지에는 보여지지 않은 선명하고 뚜렷한 영상을 위한 고주파 성분의 정보 인지로 인한 해상도의 개선을 의미한다. 즉 저해상도에서 나타나지 않은 고주파수 정보를 추정하므로써 이미지의 해상도를 높일 수 있다. 본 논문에서는 역전파(Backpropagation) 신경회로망 모델을 통해 고주파 성분의 정보를 추정함으로써 고해상도 영상을 획득하는 방법을 제안한다.