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반효진(Hyo Jin Ban),박은주(Eun Zoo Park),이우근(Woo Keun Lee) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.2
본 연구에서는 소각재와 하수슬러지, 용융슬래그 등을 이용하여 기존의 벽돌을 대신 할 수 있는 건축외장재를 제조하고, 사용 재료의 혼합비와 소성온도 등 적정 제작 조건을 도출하고자 한다. 외장재 제조는 재료를 각 비율별로 성형하여 상온과 160℃에서 각각 24시간 동안 건조 후 1,080~1,130℃에서 2시간 동안 소성하였다. 소성한 다음 제조한 외장재 시편의 압축강도를 측정해 본 결과 소성온도가 증가할수록 압축강도는 증가하였으며, 소각재의 함유량이 적을수록, 용융슬래그의 함량이 증가할수록 압축강도가 증가하였다. 본 연구에서 도출된 외장재 제조 적정조건은 소각재:용융슬래그:하수슬러지:점토의 비율이 10:20:5:65로 제조된 시편을 1,115℃에서 소성한 시편의 압축강도가 41 MPa 이상으로 나타나 외장재로서의 사용이 가능한 것으로 나타났다. 또한 제조한 외장재의 중금속 용출실험결과 환경적으로 안전한 것으로 나타났다. With the advance of industrialization and urbanization, a lot of waste has been discharged and treated by incineration. But fly and bottom ashes are generated in this process. In addition, the treatment method to recycle sewage sludge and melting slag is required to manage these wastes. The objective of this research was to prepare of multi-functional brick which were made from MSWI (Municipal solid wastes incinerator) fly ash, sewage sludge and slag. The bricks were made by mixing raw materials and then drying for 24 hours. Next, they were dried for 24 hours at 160℃ and fired for 2 hours. Calcination temperature was changed to discuss the effect of temperature from 1,080℃ to 1,130℃. Compressive strength of a brick was creased with the increase of temperature. To increase mixing ratio of fly ash and slag reduce the compressive strength the optimal condition was the mixing ratio of fly ash:melting slag:sewage sludge:clay as 10:20:5:65 and 1,150℃ of calcination temperature. Compressive strength was obtained as about 41 MPa at this condition.
하수재이용수의 잔류염소 수체감소계수에 초기염소주입농도가 미치는 영향
박재현 ( Jae Hyun Park ),이현동 ( Hyun Dong Lee ),곽필재 ( Pil Ljae Kwak ),강성원 ( Sung Won Kang ),안광호 ( Kwang Ho Ahn ),이주연 ( Joo Yeon Lee ),박은주 ( Eun Zoo Park ),김지은 ( Gi Eun Kim ),공명식 ( Myeong Sik Kong ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2012 No.-
공명식 ( Myeong Sik Kong ),이현동 ( Hyun Dong Lee ),강성원 ( Sung Won Kang ),박은주 ( Eun Zoo Park ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.4
Characteristics of leak noise frequency was built through comparison analysis of collected acoustic signals from pipeline before and after leakage. Leakage was identified at 10 points, acoustic signals were collected at 14 water supply facilities(manhole, water valve, stop valve). Investigation time was set up from 11 PM to 5 AM in order to minimize effect of white noise caused by water usage, vehicle traffic, etc. Comparing results from characteristics of acoustic signals before and after leakage showed that signal strength became weaker after repaired pipeline from the full range of frequency bands, except for some uncertain data that include heavy noise. Frequency bands indicating strong signal strength were from 200 to 2,000 ㎐, with or without leakage. As a result of analysis based on pipe material, leakage-related frequency bands were identified from 300 to 2,000 ㎐ in case of galvanized steel pipe. On the other hand, frequency bands were related less than 1,200 ㎐ if leak occurred in stainless steel pipe. Frequency analysis result according to leak point, leak noise were related from 500 to 2,000 ㎐ in case of a leak in a straight pipe, frequency bands of leak noise in joints and junction had relevance to the range of 300 to 1,200 ㎐.