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선택적 촉매 산화 반응에 의한 황화수소의 제거 : 1. 촉매의 개발 Ⅰ. Development of Catalyst
정종식,우희철,박대원,천승우,홍성수 한국공업화학회 1995 공업화학 Vol.6 No.5
본 연구는 H₂S를 산소와의 직접 산화 반응을 통해 원소 황의 형태로 제거하는 반응에서 고농도의 H₂S를 처리할 수 있는 촉매의 개발에 관한 것이다. 최적의 촉매를 개발하기 위해 각 담체와 금속 산화물에 대한 반응성 실험을 실시하였다. 실험 결과 담체로는 Al₂O₃, TiO₂, ZrO₂ 등이 금속 산화물로서는 Fe₂O₃, V₂O_5, SnO₂, Cr₂O₃ 등이 좋은 활성을 보였다. 반응물 중의 산소의 분압 영향과 반응물에 포함되어질 수 있는 물의 영향에 대해서 관찰한 결과 산소의 분압이 높을수록 전화율은 증가하나 황 선택도는 급격히 감소하는 경향을 보였고, 10vol.%의 물을 반응물에 첨가한 경우 전화율과 황 선택도가 동시에 감소하는 경향을 보였다. In this study, development of catalysts far the direct oxidation of hydrogen sulfide to elemental sulfur, specially for the treatment of high concentrantion of H₂S, was investigated. To find out optimum catalysts, a screenig test for various supports and metal oxides was carried out. Among the supports tested, Al₂O₃, TiO₂ and ZrO₂ showed good catalytic activity. Fe₂O₃, V₂O_5, SnO₂ and Cr₂O₃ have been considered to be active metal oxides. The study on the effects of oxygen partial pressure revealed that the conversion of H₂S increased with increasing the ratio of O₂/H₂S, but the selectivity to sulfur was drasctically decreased. Bath of the conversion of H₂S and the selectivity to sulfur were decreased when 10 vol.% of water was added to the mixture of H₂S and oxygen.
화학폐수 처리를 위한 전처리 공정으로서 전기응집의 경제성 분석
정종식,이재복 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
The objective of this study is to investigate the economic feasibility of electrocoagulation as pretreatment process for chemical wastewater treatment. The comparison of unit treatment cost by chemical coagulation and electrocoagulation process was carried out. The iron tube type electrode was used for electrocoagulation treatment of chemical wastewater. The removal efficiency of total phosphorus by electrocoagulation treatment was 95.7%. In the cost analysis for electrocoagulation process, operation cost of electrocoagulation process for chemical wastewater treatment was 661won/㎥. The unit treatment cost of chemical coagulation process for chemical wastewater treatment was 1,754won/㎥. And unit treatment cost of electrocoagulation process for chemical wastewater treatment was 1,166won/㎥. Electrocoagulation treatment as pretreatment process was more economic process from cost analysis comparing with traditional treatment of chemical coagulation.
JIT 자재 조달을 위한 인센티브제도 적용에 관한 연구
정종식 한국산업경영시스템학회 1999 한국산업경영시스템학회 학술대회 Vol.1999 No.춘계
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JIT 자재 조달을 위한 인센티브제도 적용에 관한 연구
정종식 한국산업경영시스템학회 1999 한국산업경영시스템학회지 Vol.22 No.52
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
웹 사이트를 이용한 온라인 종합쇼핑 몰업체의 전자고객관계관리(e-CRM) 체계에 관한 고찰
정종식,최혁준 한국유통정보학회 2002 유통정보학회지 Vol.5 No.2
E-CRM system of synthesis shopping mall's web site, composing goods the prime target, offers space that can share feeling point & information by using product. And it is providing service that can confirm transaction process with product which customer orders, settlement etc.. Also, it is offering notice board, estimation, purchase art, recommendation, confirmation of transaction etc. as a contact route. Target if Life Time Value is information retrieval connected with goods and customer class atomization. And it grasps customer desire by dividing value customer wants and customer classes, and constitutes information and inquiry offer etc. that can solve path confirmation and problem, desire etc. as a value customer seeks. And it converges to core customer by dividing customer as individual, corporation, class etc. and constitutes path confirmation as a value guest seeks and information & service offer in 1:1 view point etc.
정종식,김정대,이재복 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6
Objectives of this study were to investigate the characteristics of average flow rate, average specific resistance, cake compressibility coefficient, and medium resistance in order to estimate the dewaterability of sludge by electrodewatering for waterworks sludge. Applied sludge pretreatment processes for this research were chemical coagulation, electrocoagulation, and electrolysis. The process of filtration was performed using pressure filtration or electrodewatering. The average flow rate depends upon the pressure drop in pressure filtration. When the electrodewatering process was applied, the average specific resistance was not increased with pressure increase. The cake compressibility coefficient was 0.75 for the thickened sludge, and was 0.51 for the pretreated sludge by electrocoagulation. It was observed that the medium resistance was increased with pressure drop. Electrocoagulation or electrolysis as sludge pretreatment technique and the electrodewatering were evaluated as the most effective combination system through the analysis of average specific resistance, cake compressibility coefficient, and medium resistance.