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응집제와 관형막을 활용한 CMP 폐수 처리 가능성 연구
정호찬 ( Ho Chan Jung ),정철중 ( Cheol Joong Jung ),송자연 ( Ja Yeon Song ),김연국 ( Youn Kook Kim ),이선용 ( Sun Yong Lee ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.5
The purpose of this study is to identify the possibility of the CMP wastewater treatment from semiconductor fabrication under operating tubular membrane with coagulants. To find suitable coagulants treating CMP wastewater, we conducted Jar-test. After Jar-test experiments suitable coagulants are PAC(17%), Ca(OH)2 and optimum coagulant dosage is PAC(17%) 10mg/L, Ca(OH)2 110~120mg/L. Based on these results, the tubular membrane was applied to CMP wastewater, the turbidity removal efficiency is Ca(OH)2 > PAC(17%) > Nothing. The fast cross-flow velocity and backwash process what are operating characteristics of tubular membrane can be stable CMP wastewater treatment. But when the coagulant and tubular membrane are used at the same time, the withdraw and treatment of the CMP wastewater are possibile. However further treatment process needs if treated water will be used for semiconductor fabrications.
완전혼합형 정석탈인반응조에서 미분말 전로슬래그를 이용한 고농도 인의 회수
김응호 ( Eung Ho Kim ),임수빈 ( Soo Bin Yim ),정호찬 ( Ho Chan Jung ),이억재 ( Eok Jae Lee ),조진규 ( Jin Kyu Cho ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.1
A phosphate recovery system from artificial wastewater was developed using a completely mixed phosphorus crystallization reactor, in which powdered converter slag was used as a seeding crystal. In preliminary test, the optimal pH range for meta-stable hydroxyapatite crystallization for high phosphorus concentration was observed to be 6.0 to 7.0, which was different from the conventionally known pH range (8.0~9.5) for effective crystallization in relatively low phosphorus concentration less than 5 ㎎/L. The average phosphorus removal efficiency in a lab-scaled completely mixed crystallization system for artificial wastewater with about 100 ㎎/L of average PO₄-P concentration was shown to be 60.9% for 40 days of lapsed time. XRD analysis exhibited that crystalline of hydroxyapatite formed on the surface of seed crystal, which was also observed in SEM analysis. In EDS mapping analysis, composition mole ratio (=Ca/P) of the crystalline was found to be 1.78, indicating the crystalline on the surface of seed crystal is likely to be hydroxyapatite. Particle size distribution analysis showed that average size of seed crystal increased from 28μm up to 50μm, suggesting that phosphorus recycling from wastewater with high phosphorus concentration can be successfully obtained by using the phosphorus crystallization recovery system.