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홍지형,최윤,이승무 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.4
구리이온의 flux에 대한 실험식을 만들어 전류밀도, 도입유속에 따른 구리이온 제거효율을 계산하여 실험값과 비교하였다. 구리이온의 flux에 대한 식은 feed중 구리이온 농도에 비례하였고 확산과 대류영향을 제외한 경우 구리이온 flux는 전류밀도에 선형적으로 비례하였다. 연속식 실험에서 구리이온 및 환산의 제거효율은 도입유속 2.3㎖/min, 전류밀도 285.7A/㎡에서 구리이온은 65% 이상, 황산은 70% 이상이었다. 황산에 대한 전류효율은 도입유속이 클수록 전류가 낮을수록 높게 나타났으며 실험범위 3. 1∼15.0㎖/min, 0.3A∼1.2A 중에시 유속 15.0㎖/min, 전류 0.3A에서 황산의 전류효율은 75.4%로 가장 높게 나타났다. An experimental formula is proposed and the calculated ion removal efficiencies have been compared with experimentally measured ones with variation of current density and input flow rate. The copper ion flux has been found to be proportional to the copper ion concentration in feed. The copper ion flux without diffusion and convection has been found to be linearly proportional to the current density. When the input flow rate was 2.3 ㎖/min and the current density was 285.7 A/㎡ in the continuous system, the removal efficiencies of copper ion and sulfuric acid were 65% and 70% respectively. Current efficiency of sulfuric acid showed the highest value in the flow rate of 15.0 ㎖/min and the current of 0.3A, in the experimental range of 3.1-15.0 ㎖/min for the flow rate and of 0.3-1.2A for the current.
홍지형 한국농공학회 1993 韓國農工學會誌 : 전원과 자원 Vol.35 No.3
Groundwater and animal wastes are typical example which are underutilized resources than their value in agriculture. This paper was to investigate the actual patterns of utilization of water curtain for greenhouses and methane gas utilization from swine wastes in a view point of promoting more efficient use of alternative energy. The results from measurements can be summarized as follows : 1.It was estimated that the maximum heating load per l0a was around 23,2804/hr and the heating load at January showed 3.93X 1064 respectively for strawberry greenhouses with insulation by the water curtain. 2.The average heating cost of the greenhouse with water curtain system amounted to about 75,000 Won per l0a. This result suggested that the greater cultivated area provides less heating cost. 3.The operating volume was about 73 percent of the optimum size of the digester. The net available methane gas rates of the produced gas remained close to 62 percent, But the conventional and small size of the digester was maintained at a lower level of around 20 to 29 percent. 4.It appeared that major problems of biogas production system were required to maintain the temperature of the fermentation above ambient temperature and the optimum volume of digester.
POLICY & ISSUES 기획특집_2 - 대기질 관리 선진화를 위한 전산매체 운영현황
홍지형,Hong, Ji-Hyeong 환경보전협회 2013 환경정보 Vol.406 No.-
2013년부터 1~3종 대기배출사업장의 자가측정에 관한 기록과 배출시설 및 방지시설의 운영기록부를 전산에 의한 기록, 보존하도록 운영하고 있으며, 2014년에는 4~5종의 대기배출사업장에 대한 대기배출원 조사를 시행할 예정이다. 대기배출원 관리시스템(SEMS)의 전산매체를 활용한 국가 대기배출원조사와 배출시설 및 방지시설의 운영기록부 전산화 등의 대기 배출원 관리를 통해 대기질 관리의 선진화를 앞당길 것으로 기대가 되고 있다.
퇴비화 암모니아 가스의 톱밥 바이오 필터 매체에 의한 생물학적 탈취
홍지형,박금주 한국농공학회 2003 한국농공학회논문집 Vol.45 No.2
Dairy manure amended with crop and forest residues (moisture 69% wet basis, C/N 22) was composted in a 605 L pilot-scale vessel using continuous air flow (56 L/min) for 19 days. Three pilot-scale sawdust biofilters (moisture 63%, pH 5.0) were built to clean biological waste gas from the composting process. For each methods, two replicated experiments were monitored over a period of three weeks. The system was evaluated to determine the biofilter media depth that would be adequate for compost odour reduction. The compost air cleaning was measured based on ammonia gas concentration before and after passing through the biofilter. Ammonia gas removal efficiency over 3 weeks was 42, 75 and 87% at sawdust biofilter media depth levels of 202, 400 and 600 mm, respectively. Each sawdust biofilter was operated at a moisture content in the range of 60~62% (wb), a temperature from 15 to 25℃, an average pressure drop from 240 to 340 Pa and a detention time from 60 to 180 seconds during the biofiltration process.
교반식 퇴비화 암모니아가스의 부숙퇴비를 이용한 탈취성능 특성
홍지형,박금주 한국축산환경학회 2002 축산시설환경학회지 Vol.8 No.1
실제 규모의 반밀폐 교반통기식 퇴비화 시스템에서 돈분과 톱밥의 혼합물을 퇴비화하는 과정에서 발생하는 암모니아가스의 탈취처리를 위하여 개방식 바이오필터 시스템을 제작하고 바이오필터로서 부숙퇴비를 이용하여 탈취시험을 수행하였다. 퇴비화 및 탈취과정에서 재료의 이화학적 특성 및 암모니아가스의 발생량을 측정하여 퇴비화의 특성 및 바이오필터 시스템의 성능을 분석하였다. 바이오필터의 암모니아가스 탈취효율은 2개월 평균 84%로 나타났으며 탈취재를 통과한 후의 암모니아가스의 농도는 최대 45ppm 이하로 나타나 허용농도 (50ppm) 범위에 있었다. 부숙퇴비는 교반통기식 퇴비화 시스템에서 발생하는 암모니아가스의 탈취재로 활용할 수 있는 것으로 나타났다. Real sized open type biofilter system was manufactured to control the odor generated from the agitated composting system which composted swine manure and sawdust mixtures. The aim of this research was to develop a biofilter system using matured compost and to evaluate the performance of the biofilter system. Average ammonia reduction rate through the biofilter was 84% during about two month period of composting. The maximum ammonia concentration after filtering was 45ppm lower than allowable value of 50ppm. It was concluded that compost can be used as a biofilter materials.