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전기화학적 방법의 TRC(Total residual chlorine) 측정 연구(II: Pt전극 이용)
이준철 ( Jun Cheol Lee ),박대원 ( Dae Won Park ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.3
The conventional methods for total residual chlorine such as iodometry and DPD colorimetric can cause secondary pollution due to additional agents, also have a wide error range. As for alternative, electrochemical method can measure TRC(Total residual chlorine), and is not required as additional agents, also very suitable for using the fields of ballast water because test time is relatively fast. Therefore, this study was investigated for changing charge by agitation, salt concentration, and temperature change. Charge showed differences based on changes of reduction peak with or without agitation. In contrast, TRC and charge were well correlated in constant agitation speed. As TRC and charge were analyzed with high correlations in constant salinity and temperature of ocean, thereby conductivity was firstly measured, and charge had high correlation for TRC in spite of changing salinity and temperature Pt electrode revealed high reliability (r2 = 0.960) because it was rarely effected by TRC, On the other hand, Au electrode appeared inadequate (r2 = 0.767) to use sensor in less than 1.0 ppm of TRC. For high accuracy and detection of TRC, Pt and Au electrodes for test time were, respectively, 14 and 22 seconds. As a result, Pt electrode was more valuable than Au electrode in terms of response time.
회분식 반응기에서 음식물쓰레기를 이용한 바이오에탄올 생산
이준철(Jun Cheol Lee),김재형(Jae Hyung Kim),박홍선(Hong Sun Park),박대원(Dae Won Pak) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.6
유기성 폐기물인 음식물쓰레기를 이용하여 유용한 에너지원인 바이오에탄올을 생산하고자 하였으며, 에탄올 생산 균주는 Saccharomyces cerevisiae를 이용하였다. 음식물쓰레기의 당화를 위하여 carbohydrase와 glucoamylase 효소를 이용한 결과 carbohydrase가 glucoamylase보다 당화효율이 우수하였으며, carbohydrase 이용시 건조 음식물쓰레기 기준 glucose 생산량 0.63g/g-TS을 얻을 수 있었다. 에탄올 생산은 동시당화발효에서 0.44g/L·hr, 분리당화발효가 0.27g/L·hr이었다. In the present study, bioethanol was produced using batch style reactor from food wastes which has organic characteristics. Pretreatment was required to reduce its particle size and produce fermentable sugar. Two different enzymes such as carbohydrase and gulcoamylase were tested for saccharification of food waste. The efficiency of carbohydrase saccharification (0.63g/g-TS) has shown higher than glucoamylase saccharification(0.42g/g-TS). Saccharomyces cerevisiae produced bioethanol via separate hydrolysis & fermentation (SHF) method and simultaneous saccharification fermentation (SSF) method. The production amount of bioethanol was 0.27 g/L·hr for SHF and 0.44 g/L·hr for SSF.
전기로 환원슬래그를 제조 원료로 사용한 개량형 C<sub>12</sub>A<sub>7</sub> 광물계 급결제 및 성능 평가
조한상 ( Han Sang Cho ),황봉춘 ( Bong Choon Hwang ),문원식 ( Won Sik Moon ),박대철 ( Dae Cheol Park ),조남섭 ( Nam Sup Cho ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회지 Vol.32 No.2
This laboratory study showed the performance evaluations of a improved C<sub>12</sub>A<sub>7</sub> based mineral accelerator (I-CA) by both mortar and shotcrete tests. Performance of I-CA as a shotcrete accelerator was excellent by KCI-SC-102, which is a Korean specifications of shotcrete accelerator. In addition, I-CA showed equal qualities to the setting time and the compressive strength when compared those of the existing C<sub>12</sub>A<sub>7</sub> based mineral accelerator (CA). The I-CA was manufactured with 40wt.% of electric arc furnace reducing slag, 24wt.% of lime, and 36wt.% of bauxite, indicating that the commercialization of I-CA contributed to recycle electric arc furnace reducing slag and to reduce the manufacturing cost of C<sub>12</sub>A<sub>7</sub> based mineral accelerator due to the use a cheap raw material(electric arc furnace reducing slag), and to reduce the greenhouse gas emission due to the reductions in usage of lime and bauxite.
조한상(Han Sang Cho),문영범(Young Bum Mun),문원식(Won Sik Moon),박대철(Dae Cheol Park),김형철(Hyeong Cheol Kim),최형국(Hyun Kook Choi) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.3
친환경 토목/건축소재가 각광받는 시대가 도래되면서 시멘트 산업에서의 철강슬래그 등의 산업부산물 up-cycling 사례가 계속 증가되는 추세이다. 본 연구에서는 국내.외적으로 재활용 사례가 거의 없는 서냉 전기로 환원슬래그의 up-cycling 용도 개발을 위한 목적으로 토양환경보전법 시행규칙 별표 3의 ‘토양오염우려기준’에 근거하여 환원슬래그에 대한 기초적인 환경위해성 평가를 수행하여, 환경적 측면에서의 사용 안전성을 검증하였다. 아울러 주요 온실가스 배출원인 시멘트 생산량을 줄이기 위한 방안으로, 보통 포틀랜드 시멘트 및 고로수쇄슬래그 시멘트에 혼화재로서 환원슬래그를 일부 치환한, 2성분계 및 3성분계 혼합시멘트를 제조하고, 각 혼합시멘트 모르타르의 압축강도를 평가하였다. 압축강도 평가 결과, 환원슬래그를 최대 5 wt%까지 치환한 두 종류의 혼합시멘트 모르타르들의 재령일 28일에서의 압축강도는 무치환시멘트 경우와 유사하거나 약 1.1배 우수함을 확인하였다. This study investigated the environmental risk for up-cycling of air-cooled ladle furnace slag (LFS) and evaluated the mortar compressive strength of binary and ternary blended cements using LFS of 3, 5, 10 wt%. Based on the Soil Environment Conservation Act standard, there was no environmental risk of the up-cycling of LFS. Results of mortar compressive strength assesment showed that the compressive strength of two blended cements using LFS of lower than 5 wt% was about 1.1 times superior to that of un-substituted cement (ordinary portland cement, OPC); however the compressive strength of those with LFS of 10 wt% decreased with 10% compared with that of OPC.