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차단막 형성과 전해질의 최적화에 의한 광전변환 효율 개선 연구
박희대(Hee-Dae Park),주봉현(Bong-Hyun Joo),성열문(Youl-Moon Sung) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.3
In this work, the effects of blocking layer and optimally fabricated electrolyte were investigated with respect to impedance and conversion efficiency of the cells.A layer of TiO<SUB>2</SUB> less than ∼200nm in thickness, as a blocking layer, was deposited by rf sputtering onto the F:SnO<SUB>2</SUB> (FTO) glass to be isolated from the electrolyte in dye-sensitized solar cells (DSCs). Also, optimum condition of electrolytes preparation for DSCs was investigated. 3-methoxyppropionitrie and redox pairs with LiI and I<SUB>2</SUB> were used as solvents for fabrication of electrolyte. The electrochemical impedances of DSCs using this photo-anode were R<SUB>1</SUB>: 13.8, R<SUB>2</SUB>: 15.1, R<SUB>3</SUB>: 11.9 and R<SUB>h</SUB>: 8.3Ω, respectively. The R<SUB>2</SUB> impedance related by electron transportation from porous TiO<SUB>2</SUB> to FTO showed lower than that of normal DSCs. The photo-conversion efficiency of prepared DSCs was 6.4% and approximately 1.3% higher than general one.
이영대(Young Dae Lee),최용수(Yong Su Choi),윤현식(Hyun Sik Yoon),홍석원(Seok Won Hong),주봉현(Bong Hyeon Joo) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.3
A pilot-scale (50 ㎥/day) of a single sludge reactor, which contains an anaerobic, anoxic, and aerobic reaction zone in a cylindrical single reactor, was evaluated. This process has been developed and designed to remove nutrients as well as organic matters in a single sludge reactor. During the experimental period, special attempts were made to quantify nitrification and denitrification efficiencies and to evaluate factors affecting the performance of nitrogen removal. In the case of removing nitrogen, which consists of nitrification and denitrification reaction under steady-state conditions, the results indicated that seasons` variation of the temperature was a major factor affecting the performance of the nitrogen removal.
혐기 - 간헐포기 공정에서 Denitrifying PAOs 의 거동 특성
신응배(Eung Bai Shin),윤은경(Eung Kyung Youn),이두진(Doo Jin Lee),주봉현(Bong Hyun Joo) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.3
This study investigated the occurrence and the behavior of Denitrifying Phosphate Accumulating Organisms (DePAOs). These organisms are capable of phosphorus removal and denitrification simultaneously under anoxic conditions. The experiment was conducted in two parts: The phosphorus removal efficiency was evaluated in an anaerobic-intermittent aeration process which was designed to be an Enhanced Biological Phosphorus Removal(EBPR) process: Then, several batch tests were carried out in order to elucidate how the DePAOs responds in an anaerobic-intermittent aeration process under varying conditions. In the first part of the experiment, the results show that the overall phosphorus removal efficiency is as high as 93.3% in a continuous flow system and hence the anaerobic-intermittent aeration process is in fact an EBPR process. In the batch tests, the presence of DePAOs under different anoxic conditions was observed with a limited amount of substrate. Several batch tests were run under anoxic conditions. The test samples were spiked with different nitrate concentrations of 5, 10 and 20 ㎎NO₃^- -N/L respectively. The tests revealed that both phosphorus uptake rate and denitrification rate were proportional in the first 30 min and phosphate uptake rate was 17.78∼24.89 ㎎PO₄^(-3) -P/gVSS/d and denitrification rate was 37.33∼53.33 ㎎NO₃^- -N/gVSS/d. The rate of phosphate uptake under anoxic conditions is 15.8∼26.3% slower than under aerobic conditions. With the available organic substrate, phosphates are released in anoxic condition. Results of these experiments cleary indicate that DePAOs exist under anoxic conditions in the EBPR process and that the phosphorus release and uptake under anoxic conditions depends on the presence of available organic substrate and the concentration of nitrate.