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조진규(Jin-Kyu Cho),김형진(Hyung-Jin Kim),박영진(Young-Jin Park) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.2
하수관거정비 및 하수처리장 건설사업의 지속적인 추진으로 인해 하수처리장의 최종산물로 발생되는 하수슬러지(일명 탈수케이크)의 양은 매년 크게 증가하여 2011년에는 2005년 대비 약 43%정도가 증가된 10,071톤/일이 발생될 것으로 예측되고 있다. 이렇게 발생된 슬러지의 처분은 이전에는 대부분을 매립에 의존하였으나 2003년부터 1일1만톤 이상의 시설용량을 가진 하수처리장에서 발생되는 슬러지의 직매립이 금지되면서 해양배출에 크게 의존하여 2005년에는 발생량의 77%를 해양배출로 처리하였다. 그러나 런던협약 '96 의정서가 발효되면서 폐기물의 해양배출규제가 대폭 강화됨에 따라 하수슬러지의 해양배출이 사실상 어려워지고 있으며, 2012년부터는 하수슬러지 및 축산폐수의 해양배출을 전변 금지할 계획에 있어 매립처분 및 해양배출을 대체할 경제적이면서 실용적인 감량화 및 재활용기술이 절실히 요구되고 있다. 이에 본고에서는 우리나라의 하수슬러지 처리 및 관리현황을 점검하여 보고 현재까지 개발된 하수슬러지 처리기술에 대해 고찰함으로써 하수슬러지 처분문제를 해결하기위한 현실적인 대안을 검토하였다. The amount of sewage sludge(dehydration cake) from sewage treatment plants is about 7,052 ton/day as of 2005, and the generation amount is estimated about 10,071 ton/day in 2011 by increase of 43% as compared with 2005 due to continuous drain pipe maintenance and sewage treatment plant construction. The most part of sludge is reclaimed before 2003, but 77% of sludge is disposed into the ocean in 2005 owing to the direct reclamation of sludge from the plant with capacity of 10,000 ton per day is prohibited by law. The ocean disposal of sewage sludge is almost impossible as the restriction of ocean disposal is strengthened by London Agreement '96 Protocol. The ocean disposal of sewage sludge and livestock wastewater is strictly prohibited in 2012. So, economical and practicable reduction and recycling technology are urgently needed that are displaced with reclamation and ocean disposal. In this study, the practical alternative plan of sewage sludge disposal is proposed by examining of status of sewage sludge treatment and management and studying of treatment technology of sewage sludge which is developed at present.
Fly Ash 를 이용한 하수슬러지의 고화처리에 관한 연구
조진규(Jin Kyu Cho),김성호(Sung Ho Kim),김응호(Eoung Ho Kim) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.6
This study was performed to evaluate feasibility of fly ash as a solidifying agent for the solidification of sewage sludge. The unconfined compressive strength and pH were observed with during time and mixing ratio, and heavy metal leaching test was performed. Also, XRD, SEM and EDS analysis was performed for the microstructure analysis of the solidified sewage sludge. Immaterial increase of unconfined compressive strength was shown for the sewage sludge mixed with fly ash as a solidifying agent, but the unconfined compressive strength was increased highly for the use of quicklime as a solidifying aid. So, It is possible to use fly ash as a solidifying agent mixed with a small quantity of quicklime. The results of leaching tests was shown that the concentrations of leachate heavy metals(Cu, Pb, Cd and Cr^(6+)) were lower than the Korea toxic waste criteria. The microstructure analysis by SEM was shown that needlelike crystals appeared as the solidification proceed. The analysis of these crystals by EDS confirmed that these main components were Ca, Si etc. Also, XRD analysis was shown that the main solidification products was CSH.