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직류 전원과 펄스 전원을 이용하여 오염된 토양에서의 중금속과 페놀 처리
최창식 ( Changsik Choi ),홍범의 ( Bumeui Hong ),최희영 ( Hee Young Choi ),이은실 ( Eunsil Lee ),최석순 ( Suk Soon Choi ) 한국공업화학회 2016 공업화학 Vol.27 No.6
본 연구에서는 오염된 토양 속에 함유된 중금속과 페놀의 처리에 대하여 직류 전원과 펄스 전원을 적용하여 고찰하였다. 직류 전원을 사용하여 오염된 토양을 처리하였을 때 구리, 아연, 비소, 납의 제거 효율은 각각 70, 87, 12, 11%를 나타내었고, 페놀은 85% 이상이 제거되었다. 그리고 펄스 전원을 사용하였을 때 구리, 아연, 비소, 납의 제거효율이 각각 87, 91, 37, 38%이었으며, 페놀은 88% 제거되었다. 이러한 결과들은 펄스 전원을 오염된 토양에 적용하였을 때, 전기삼투 현상은 낮아졌지만 중금속들의 전류이동 속도가 증가함을 알 수 있었다. 또한 토양의 점토 성분에 의한 흡착 능력의 향상으로 인하여 비소와 납의 제거효율이 증가되었다. 따라서 이러한 직류 전원과 펄스 전원을 이용하는 동전기 실험 결과들은 여러 가지 중금속들과 페놀을 처리하는 복원 기술로 유용하게 활용될 수 있을 것이다. In this work, the treatment of heavy metals and phenol in the contaminated soil was investigated by applying direct current (DC) and pulse voltage. When the DC was used, the removal efficiencies for Cu, Zn, As, and Pb were 73, 88, 10, and 10%, respectively, and more than 95% for phenol was removed. Furthermore, when a pulse voltage was employed the removal efficiencies for Cu, Zn, As, and Pb were 88, 92, 40, and 40%, respectively, and 87% of phenol was removed. The results indicate that the application of a pulse voltage for the treatment of contaminated soil reduced electro-osmosis, but increased the rate of electric current movement of heavy metals. In addition, the removal efficiencies for As and Pb have been improved due to the enhanced adsorption capacity of clay components in the soil. Therefore, these experimental results could be effect-tively applied in remediation technology for the treatment of various heavy metals and phenol.
Changsik Choi,Gi Bo Han,Jung Hee Jang,Tae Jin Lee 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
High purity O2 concentrated by the PSA-type O2 separator was applied to a room ventilation system combined with CO2 adsorption module to remove the indoor CO2 for the indoor air quality. And then the room was occupied by several persons to breathe for the O2 consumption and CO2 generation. As a result, the indoor air quality was improved by the ventilation system combined with the O2 supply and the CO2 adsorption module. It was due to the fact that the CO2 concentration was not steeply increased, but also even decreased and then the increasing rate of the O2 concentration with the O2 supply was simultaneously increased by the CO2 removal despite the CO2 generation and O2 consumption with the four persons’ breathing. As a representative result, in the case of supplying the high purity O2 of 30 L/min under using the CO2 adsorption module, the best performance with the highest increasing rate of O2 concentration and the lowest increasing rate of CO2 concentration was obtained among the various cases, and then the increasing rates of CO2 concentration and O2 concentration were −2.3 ppm/min and 33.3%/min, respectively.
Changsik Choi,Gi Bo Han,Jung Hee Jang,Tae Jin Lee 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
To minimize the cost and loss rate of energy artificial room ventilation system, the O2 separator was suggested for the flow of the excessive ventilation amount between indoor and outdoor because the pure O2 separated and concentrated by the O2 separator can be supplied with the ventilation amount minimized. How the O2 separator applies to ventilation and its operation characteristics were investigated by controlling under various conditions as well as the operation conditions optimized required for indoor air quality such as the concentration of CO2 and O2. Consequently, it was known that the O2 concentration was increased; however, the increase of the CO2 concentration was suppressed by the sufficient supply of O2 concentrated from the storage tank into the room despite the two persons’ breathing in the room having an inner volume of about 56m3. Consequently, it was concluded that the supply system of the concentrated O2 which was stored into the tank after the production with the O2 separator can be applied to the room ventilation system for the improvement of the indoor air quality.
Field Adaptation Test of Mechanization Technology System for Whole Process in Potato Production (II)
( Ilsu Choi ),( Youngkeun Kim ),( Yong Choi ),( Hyeonjong Jun ),( Taegyoung Kang ),( Sanghee Lee ),( Jingu Kim ),( Seounghwa Yu ),( Changsik Hyun ),( Jihong Jo ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Recently, consumption of processed potatoes is increasing due to Westernization of diet in korea. However, imports of that have been increasing steadily due to a lack of rural labor and a reduction of cultivation area. It is necessary that we develop mechanization technology system for whole process in potato cultivation, in order to raise the self-sufficiency rate and solve the problem of rural labor. For saving potato production labor, the present study was conducted to establish a mechanization technology system of whole process from plowing to harvest in potato production and to analyze its effect. The working process of potato cultivation were made up of ‘field preparation → ridging → planting → vinyl mulching → stem removing → harvesting'. And then field tests that using agricultural machinery in the whole working process, were carried out. In the case of the conventional section, the field preparation was carried out using the rotavator, fertilizer spreader and the ridging was done using a ridger then planting potato by man power. The field preparation of mechanized section was carried out in the same way as the conventional section. But ridging, planting and vinyl mulching working were carried out using a automatic potato planting machine(prototype) that cuts potato and then plants cut potato at the same time. The automatic potato planter is a composite working Implement in which ridging, planting, and vinyl mulching are performed at the same time. So the mechanized section did not use ridging machine and vinyl mulching machine. It was used in conventional cultivation methods to administrate of cultivation mechanized and conventional section under the same conditions. In the case of Stem removing working before harvesting, the conventional section was carried out using man power. But the working of mechanized section was carried out using a stem crusher(prototype) of potato. Harvesting working was carried out by gathering type potato harvester in the mechanized section. But in the conventional section, harvesting working was carried out using root-harvester and then collecting potato by man power. The effect of whole process mechanization was analyzed through the analysis of the required work time and cost of conventional and mechanized section. And the analyzed result was that Production of potatoes by the whole mechanized process has saved 54% labor and 23% of the cost compared to conventional cultivation process.
최일수 ( Ilsu Choi ),김영근 ( Youngkeun Kim ),최용 ( Yong Choi ),전현종 ( Hyeonjong Jun ),강태경 ( Taegyoung Kang ),이상희 ( Sanghee Lee ),김진구 ( Jingu Kim ),유승화 ( Seounghwa Yu ),현창식 ( Changsik Hyun ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2
밭작물 재배에서 트랙터는 지상고, 바퀴폭 및 차륜폭 등의 제한으로 주로 경운·정지 작업에 이용되며, 밭작물 파종·이식, 관리(중경제초, 방제 등) 작업에 제약이 있다. 또한 국내에서 생산 보급되고 있는 4륜승용관리기는 주로 방제기, 비료살포기, 비닐피복기의 본체로 이용되고 있으나, 가격이 비싸고 다양한 재배양식에 따른 차륜폭 조절 및 본체 후방에 부착된 작업기로 인한 작업 상태 확인 등에 어려움이 있는 실정이다. 따라서 밭작물 재배 확대 및 농업 노동력 구조적 변화에 따른 고령자, 부녀자들도 안전하고 쉽게 사용 가능한 밭작물용 3륜형 승용관리기 개발이 필요하다. 이에 3륜형 승용관리기를 설계·제작하고 시작기의 안정성 및 작업성능을 평가하기 위하여 횡전도각을 분석하고 포장성능 시험을 수행하였다. 시작기는 3륜 구동방식으로 주변속은 HST 무단변속, 부변속은 2단 선택맞물림기어식 변속장치를 채용하였고, 운전자가 작업상태 확인과 작업기 조절이 용이하도록 mid-PTO 방식을 채용하여 작업기를 시작기의 전륜과 후륜사이 하부에 부착되도록 설계·제작하였다. 또한 다양한 밭작물 재배양식에 적용 가능하도록 후륜 차륜폭을 유압 실린더를 이용하여 1320~1720 mm 범위로 조절 되도록 하였으며, 선회반경 감소를 위하여 전륜에 배속장치를 설계하여 급선회가 가능하도록 하였다. 3륜형 승용관리기의 포장 경사도를 고려한 전도 안정성 분석을 위하여 시작기의(후륜)차륜폭을 요인으로 횡전도각을 분석하였으며, 농업기계 검정기준에 준하여 운전석에 75 kg의 모래주머니를 거치하여 시작기의 좌·우 한계 전도각을 측정하였다. 최소 전도각은 차륜폭이 1320 mm 일 때 좌전도각은 32.8°, 우전도각 32.1°로 분석되었으며, 최대 전도각은 차륜폭이 1720 mm 일 때 좌전도각은 40.3°, 우전도각 39.1°로 분석되었다. 시작기의 포장성능 시험은 경남 거창군 가북면 소재 농가포장에서 파종작업기를 부착하여 콩 파종 작업을 대상으로 수행하였으며, 작업성능은 농업과학기술 연구조사분석기준의 농작업기계 포장성능 산출식을 이용하여 분석하였다. 시작기의 콩 파종 작업성능은 평균작업속도 1.1 m/s, 유효작업폭 1.4 m, 평균 회행시간 147.9초 일 때 0.77시간/10 a로 분석되었다.