• 제목/요약/키워드: electrolysis

검색결과 802건 처리시간 0.036초

소형선박에 설치 가능한 해상기인 오염원 멸균용 에너지 자급형 전기분해 장치 개발 (Energy self-sufficient electrolysis apparatus for sterilization of portable toilet in small vessels)

  • 오승원;한민수;최해욱
    • 수산해양기술연구
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    • 제48권3호
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    • pp.269-276
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    • 2012
  • Marine caused pollution occurs mostly near coastal area and its main cause was known to be human feces issued from small vessels. To sterilize liquid pollutants from portable toilets of small vessels, an electrolysis treatment is judged to be the most economic and stable method considering an environment of its use. In this paper, we presents an electrolysis apparatus which is the most appropriate for sterilizing pollutants from portable toilets of small vessels and derives the minimum operating time of the apparatus for sterilizing norovirus which is a main target of marine caused pollution sources. In order to utilize renewable energy, we designed an apparatus which generates a renewable energy from solar cells. As a result, we could confirm the applicability of the proposed system with the results from experiments in three cases of different weather conditions.

Electrochemical Activity of a Blue Anatase TiO2 Nanotube Array for the Oxygen Evolution Reaction in Alkaline Water Electrolysis

  • Han, Junhyeok;Choi, Hyejin;Lee, Gibaek;Tak, Yongsug;Yoon, Jeyong
    • Journal of Electrochemical Science and Technology
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    • 제7권1호
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    • pp.76-81
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    • 2016
  • An anatase TiO2 nanotube array (NTA) was fabricated by anodization and successive heat treatments. When the anatase TiO2 NTA was cathodically polarized, its color changed to blue, and it could be used as an electrochemically active anode for an oxygen evolution reaction (OER) in alkaline water electrolysis. The structure of the blue anatase TiO2 NTA was controlled by the anodization conditions and its catalytic activity increased with an increase of the surface area. The activity of the blue anatase TiO2 NTA gradually reduced with the continued OER because of the partial oxidation of Ti3+ to Ti4+. However, an intermittent cathodic regeneration process could significantly slow its reduction rate. The blue anatase TiO2 NTA could be an alternative anode for alkaline water electrolysis.

철 전기분해장치와 무산소/호기공정을 결합한 질소, 인제거 특성에 관한 연구 (A Characteristic of Nitrogen and Phosphorus Removal in Anoxic/Oxic Basins combined with Iron Electrolysis)

  • 김영규
    • 한국환경보건학회지
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    • 제43권6호
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    • pp.525-531
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    • 2017
  • Objectives: The purpose of this experiment is to better understand the nitrogen and phosphorus removal ratio according to operating conditions in an iron electrolysis system consisting of an anoxic basin, aerobic basin, and iron precipitation apparatus. Methods: Iron electrolysis consists of an iron precipitation reactor composed of iron plates in oxic and anoxic basins. We studied the interrelation coefficient between T-N and T-P removal rates and F/M ratio, and the C/N ratio and BOD removal rate. Results: The F/M ratio and the T-N and T-P removal rate per unit area have interrelation coefficients of 0.362 and 0.603, respectively. The removal rate per MLVSS and the T-N and T-P removal rate per unit area have respective interrelation coefficients of 0.49 and 0.59. Conclusions: The removal rate of T-N and T-P increased with the increasing F/M ratio in the influent, and they also linearly increased in proportion to the C/N ratio of influent and BOD removal rate of the reactor.

고고도 무인기용 수전해 셀 및 스택의 제작 및 성능 평가 (Evaluation of the Performance of Water Electrolysis Cells and Stacks for High-Altitude Long Endurance Unmanned Aerial Vehicle)

  • 정혜영;이준영;윤대진;한창현;송민아;임수현;문상봉
    • 한국수소및신에너지학회논문집
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    • 제27권4호
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    • pp.341-348
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    • 2016
  • The experiments related on structure and water electrolysis performance of HALE UAV stack were conducted in this study. Anode catalyst $IrRuO_2$ was prepared by Adam's fusion methods as 2~3 nm nano sized particles, and the cathode catalyst was used as commercial product of Premetek. The MEA (membrane electrode assembly) was manufactured by decal methods, anode and anode catalytic layers were prepared by electro-spray. HALE stack was composed of 5 multi-cells as $0.2Nm^3/hr$ hydrogen production rate with hydrogen pressure as 10 bar. The water electrolysis performance was investigated at atmospheric pressure and temperature of $55^{\circ}C$. Best performance of HALE UAV stack was recorded as cell voltage efficiency as 86%.

PEM 수전해를 이용한 P2G에 대한 경제적 타당성 분석 (Economic Feasibility Analysis for P2G Using PEM Water Electrolysis)

  • 정선주;최낙헌;문창환;문상봉;임한권
    • 한국수소및신에너지학회논문집
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    • 제28권3호
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    • pp.231-237
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    • 2017
  • With worldwide efforts to increase the portion of renewable energy for $CO_2$ reductions, a lot of attention has been paid to P2G (power-to-gas) in Europe and Japan to efficiently utilize the surplus electricity. In this paper, economic feasibility analysis has been carried out for P2G using PEM water electrolysis by reflecting current economic status in Korea. In addition, efficiency and electricity price required to be competent in Korean market were provided. Based on cash flow diagrams, unit production costs for $H_2$ and $CH_4$ were estimated and profitability of P2G using PEM water electrolysis was analyzed.

E. coli 불활성화를 위한 단일 소독 공정의 비교 (A Comparison of Single Disinfection Process for Inactivation of E. coli)

  • 김동석;송승구;박영식
    • KSBB Journal
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    • 제25권1호
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    • pp.25-32
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    • 2010
  • This study was carried out to evaluate the performance of three kinds of single process (electrolysis, UV and ultrasonic process) for the purpose of disinfection of Escherichia coli in water. Among the five kinds of electrode material, disinfection performance of Ir electrode was higher than that of the other electrodes. The order of disinfection performance for E. coli in single process lies in: electrolysis > UV $\gg$ ultrasonic process. Performance of the three single processes was increased with the increase of the electric power. Disinfection efficiency of the three processes was increased with the decrease of the pH. Disinfection of the UV process were decreased by the increase of NaCl dosage and air flow rate. However, ultrasonic process was not affected above two parameters. OH radical was not produced in UV and ultrasonic process. E. coli disinfection of the electrolysis process was well agreed with RNO degradation tendency, except pH.

제조 방법이 다른 은 콜로이드 용액 처리 직물의 항균효과 (Antimicrobial Activity of Fabrics Treated with Colloidal Silver Solutions Made by Electrolysis and Reduction)

  • 정혜원;김보연;양희주
    • 한국의류학회지
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    • 제29권6호
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    • pp.805-813
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    • 2005
  • In recent years, greatly increased incidences of diseases made people more concerned about their hygienic environment. Since clothes are the closest environment to man, many methods have beef proposed to impart antimicrobial properties to the textiles. Benefits associated with incorporating antimicrobial properties in textiles include protection to the wearer from microbiological attack, and prevention of odor from perspiration. Silver has been known to kill 650 different disease organisms, however, nano-sized silver particles are known as skin friendly and does not cause skin irritation. In this study, we have examined the antimicrobial effects of cotton or polyester fabric, on which nano-sized silver particles were treated. Colloidal silver solution made by electrolysis of $99.9\%$ silver stick was more effective than that by reduction of $AgNO_3.\;0.7\%$ concentration of colloidal silver solution by electrolysis is helpful to give reduction of $99.9\%$ S. aureus and K. pneumoniae on a cotton fabric without the decrease of whiteness. Since the structures of fiber and fabric effect on their antimicrobial property, PET filament fabric didn't have sufficient antimicrobial properly. The fabrics treated with up to $5\%$ colloidal silver solution didn't have the properly of antistatic and electromagnetic shield.

해수 전기분해를 적용한 배연 탈질 기술에 관한 연구 (A Study on the NOx Reduction of Flue Gas Using Seawater Electrolysis)

  • 김태우;김종화;송주영
    • 한국응용과학기술학회지
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    • 제29권4호
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    • pp.570-576
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    • 2012
  • 본 연구에서는 무격막식 전기분해 처리된 해수를 산화제로하는 NO 산화반응의 특성에 대해 실험적으로 살펴보았다. 폐순환 정전류 전기분해 시스템을 통해전해 시간이 길어질수록 전해수의 유효 염소농도와 온도, 염소산 이온의 비율이 증가함을 확인하였다. 전해수가 채워진 버블링 반응기에서 전해수의 유효염소농도와 온도에 비례하여 $NO_2$로 산화되는 NO의 양이 증가하였다. 또한 산화되어 생성된 $NO_2$는 전해수에 용해되어 $HNO_3{^-}$ 이온으로 존재함을 확인하였다.

물의 전기분해를 이용한 납-흡착 활성탄으로부터 납의 제거 (Removal of Lead from Lead-loaded Activated Carbon Using Water Electrolysis)

  • 김부웅;성경식;최연석
    • 공업화학
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    • 제10권6호
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    • pp.929-933
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    • 1999
  • 염산 수용액을 전해액으로 하여 물의 전기분해가 일어나는 조건에서 양극에 충전된 납-흡착 활성탄으로부터 납의 제거 실험결과, 흐름 조건으로서 양극부와 음극부의 유량이 동일한 경우 전체 유량 10 mL/min이 적당하며 전류 증가는 양극에서의 pH를 감소시키고 양극에서의 pH 감소가 납의 제거율 증가를 가져옴을 알 수 있었다. 물의 전기분해를 이용하는 본 방법은 산세척법에 비하여 약품 사용량을 줄이면서 납-흡착 활성탄으로부터 납을 효과적으로 제거할 수 있는 방법임을 알 수 있었다.

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Performance Assessment of Electrolysis Using Copper and Catalyzed Electrodes for Enhanced Nutrient Removal from Wastewater

  • Kim, Woo-Yeol;Son, Dong-Jin;Yun, Chan-Young;Kim, Dae-Gun;Chang, Duk;Sunwoo, Young;Hong, Ki-Ho
    • Journal of Electrochemical Science and Technology
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    • 제8권2호
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    • pp.124-132
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    • 2017
  • The performance of electrolytic processes using copper and catalyzed electrodes for enhanced nutrient removal with various catalyzers and combinations of electrodes was evaluated. The catalyzed electrodes removed more ammonia nitrogen than the copper electrode, but higher ammonia removal was achieved using a Pt/Ti anode. On the other hand, electrolysis using the Pt/Cu anode consumed less energy and cost less. During electroreduction, nitrate was better removed by a pair of copper electrodes than by the catalyzed electrodes. During electrolysis of synthetic wastewater, ammonia removal not only increased owing to direct oxidation at the anode, but was also influenced by indirect oxidation at the cathode. Platinum-coated copper and titanium cathodes actively produced oxidizers and thus removed more ammonia than a pure metal cathode. Although phosphorus was removable irrespective of the type of catalyzer, electrocoagulation using the copper electrode achieved complete removal of phosphorus in a period of less than 10 min.