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최용수,신응배,이영대 ( Yong Su Choi,Eung Bai Shin,Young Dae Lee ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.3
Experimental study for the removal of organic and phosphorus in synthetic wastewater was conducted in a single reactor including anaerobic-anoxic-aerobic zone and clarifier. Attempts were made to delineate phosphorus removal mechanisms and to evaluate the removal efficiencies of organic and phosphorus with different internal recycle ratios, N/P ratios and various SRT conditions. The removal efficiencies of TOC, BOD and COD were observed to be higher than 95%, 90% and 90% respectively with aerobic recycle rates of 100% and 200%. It was recognized that the optimal operational condition for phosphorus removal was the aerobic internal recycle rate of 100% with the inlet fraction 0.2. The percent removal efficiencies were 92.1% for T-P and 90.1% for PO-4-P. While, large differences in the removal of phosphorus with N/P ratios were observed; at influent TKN/T-P of 2.5, 3.6 and 5.1, removal efficiencies for T-P were 88.7%, 67.6% and 55.9%, respectively. Those removal efficiencies decreased with the increase of N/P ratio in wastewater charged. In case of SRT, removal rates of 93.5% for T-P and 92.1% for PO₄-P were observed with the solid retention time of l0 days. These rates are higher than results in 5 days and 20 days of SRT. Thus high removal efficiencies for organic substances and phosphorus in wastewater were simultaneously obtained by a new biological process with a single reactor.
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.
신중두(Joung Du Shin),최용수(Young Su Choi),이선일(Sun Il Lee),홍성창(Seung Chang Hong),이종식(Jong Sik Lee) 유기성자원학회 2017 유기물자원화 Vol.25 No.1
본 실험의 목적은 토양탄소 격리 기술을 개발하기 위한 바이오차 팰렛 시용에 따른 고추 생육 효과를 평가하는 것이다. 처리는 고추 수확 후 총 탄소 함량, 암모늄태 질소의 농도 및 총 바이오매스량 비교를 위해 일반적인 영농 방법으로서 대조구, 돈분 팰렛, 바이오차와 돈분 퇴비 혼합 비율별 바이오차 팰렛 시용구 (9:1, 8:2, 6:4, 4:6, 2:8)로서 구성되어 있다. 바이오차 팰렛의 사용량은 고추 재배를 위한 추천 시용량 (440kg/10a)기준으로 혼합 비율에 관계없이 8.8 g/pot이었다. 실험 결과로서 총 탄소 함량은 대조구와 비교하여 처리구에서 1.8-2.6배 낮게 나타났다. 암모늄태 질소의 농도는 대조구와 비교하여 처리구들 사이에 유의차가 인정되지 않았으며, 질산태 질소는 모든 처리구에서 검출되지 않았다. 그렇지만, 총 바이오매스량은 다른 처리구에서는 낮게 나타났다 할지라도 대조구와 2:8 바이오차 팰렛 처리구 사이에는 유의차가 인정되지 않았다. 따라서 이 바이오차 팰렛 시용은 농사 활동에 있어서 탄소격리를 위해서는 더욱더 연구되어야 한다. Objective of this experiment was to evaluate the effect on pepper growth to application of biochar pellet in case of development of soil carbon sequestration technology. The treatments consisted of control as a general agricultural practice method, pellet (100% pig compost), biochar pellets with mixture ratio of pig compost (9:1, 8:2, 6:4, 4:6, 2:8) for comparison of total carbon contents, NH4-N concentrations, and total biomass in the pots applied with biochar pellets after pepper harvesting. The application rates of biochar pellet was 8.8 g/pot regardless of their mixed rates based on recommended amount of application (440 kg/10a) for pepper cultivation. For the experimental results, Total carbon contents in the treatments were low from 1.8 to 2.6 fold as compared to the control. NH4-N concentrations were not significantly different among the treatment plots as compared to the control, but NO3-N was not detected in the all treatment plots. However, total biomass was not only significantly different between the control and 2:8 (biochar : pig compost) biochar pellet application plot even if the other treatments were low. Therefore, this biochar pellet application might be further modified for soil carbon sequestration in agricultural farming practices.
윤현식(Hyun Sik Yoon),최용수(Yong Su Choi),이영대(Young Dae Lee),홍석원(Seok Won Hong),정익재(Ik Jae Chung) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.2
In general a waste activated sludge is biologically stabilized by either aerobic or aerobic digestion. Typical problems associated with these two processes include high energy requirement, capital cost, and high load to the main wastewater treatment process due to returned digestion supernatant. To overcome these problems in conventional digestion processes, the intermittently aerated sludge digestion, which is operated under combined aerobic and anoxic condition, has been studied for another alternative. In order to understand the behaviors of nutrients in a supernatant of sludge digestion, intermittently aerated batch and continuous digestion experiments were investigated in this study. In a batch digestion, it is shown that nitrogen and phosphorus concentration in the intermittently aerated digestion are less than those in controlled batch digestions: anaerobic digestion without air supply and aerobic digestion with continuous air supply. The endogenous nitrate respiration following the nitrification and the P-uptake by the residual microbes are alternatively occurred in the intermittently aerated digestion. In the continuous digestion, nitrogen and phosphorus concentration in the effluent were examined under air on/off operating condition.
신중두(Joung Du Shin),최용수(Young Su Choi),최은정(Eun jung Choi),김명숙(Myung Sook Kim),허정욱(Jeong Wook Heo) 유기성자원학회 2017 유기물자원화 Vol.25 No.3
본 실험의 목적은 토양탄소 격리 기술을 개발하기 위한 바이오차 팰렛 시용에 따른 토양의 이화학성 변화 및 작물 수량 효과에 대해 평가하는 것이다. 처리는 일반적인 영농 방법으로서 대조구, 돈분 팰렛, 바이오차와 돈분 퇴비 혼합 비율별 바이오차 팰렛 시용구 (9:1, 8:2, 6:4, 4:6, 2:8)로서 구성되어 있다. 바이오차 팰렛의 사용량은 상추 재배를 위한 추천 시용량 (330kg/10a)기준으로 혼합 비율에 관계없이 6.6 g/pot이었다. 상추수확 후 상토의 pH, EC, 암모늄태 질소의 농도 변화를 분석하였다. 실험 결과로서 pH는 대조구와 비교하여 돈분팰렛 처리구에서 증가하였지만, 바이오차 팰렛 처리구(4:6 및 2:8)에서 감소하였다. EC는 처리구간에 유의차를 보이지 않았다. 암모늄태 질소 함량은 단지 돈분 팰렛 처리구에서 증가하였지만, 질산태 질소는 모든 처리구에서 감소하였으나, 상추 수량은 대조구와 비교하여 바이오차 팰렛 처리구( 9:1, 8:2 및 4:6)에서 9.5%에서 11.4%가 증가하는 것으로 나타났다. 그러므로 바이오차 팰렛 시용은 상추생육에 저해요인으로 작용하지 않고, 오히려 긍정적으로 나타남으로서, 작물 재배에 있어서 바이오차 펠렛을 시용하게 되면 토양 탄소격리 및 온실가스완화를 위해서 유용하다고 생각된다. Objective of this experiment was to evaluate efficiency of application of biochar pellet in case of application of soil carbon sequestration technology. The treatments were consisted of control as general agricultural practice method, pellet(100% pig compost), biochar pellets with mixture ratio of pig compost(9:1, 8:2, 6:4, 4:6, 2:8) for comparatives of pH, EC, NH₄-N and NO₃-N concentrations, and yields in the nursery bed applied biochar pellets after lettuce harvesting. The application rates of biochar pellet was 6.6g/pot regardless of their mixed rates based on recommended amount of application (330kg/10a) for lettuce cultivation. pH in the nursery bed applied different biochar pellets after lettuce harvesting was only increased in the treatment plot of pig compost pellet application, but decreased in 4:6 and 2:8 pellet application plots. However, EC was observed to be not significantly different among the treatments. NH₄-N concentration was only increased in the treatment plot of pig compost pellet application, but NO₃-N concentrations were decreased as compared to the control. Yields in the treatments of 9:1, 8:2 and 4:6 biochar pellet application plot were increased from 9.5% to 11.4%. Therefore, this biochar pellet application might be useful for soil carbon sequestration and greenhouse gas mitigation in the agricultural farming practices because it was appeared to be a positive effect on lettuce growth.