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임경호(Kyeong Ho Lim),박영오(Young Oh Park),배병욱(Byung Uk Bae) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.2
Rapid sand filters in water treatment plants (WTP) is one of the most important step in order to remove fine particle including pathogens such as Criptosporidium and Giardia. Filters should be assessed based on their capability to achieve a treated water quality of less than 0.1 NTU on a continuous basis to ensure the integrity of the filtration process as a viable barrier in the treatment scheme. This is less than the 1.0 NTU standard, but operation of filters to produce filtered water quality confidence that pathogens are being removed prior to the last barrier, disinfection. In this study, to optimize existing filtration unit process, rapid sand filters working in S-WTP were evaluated for various factors. The results of comprehensive performance evaluation were followings. From the filter media analysis, effective size and uniformity coefficient of media was 0.90∼1.0 ㎜ and 1.44∼1.47, respectively. Therefore, the replacement of media is needed to optimize filter performance. Media loss was caused by air binding in the filter bed and improper operation of backwashing process. The ratio of the water used for filter washing to the amount of filtered water was 2.5∼3.0% during the winter and 1∼2% in the summer. At the beginning of a filter run, filtered water turbidity was over 0.5 NTU during about 20 min. Shorter filter run lengths was attributed to an overabundance of filter clogging algae (Synedra. sp), air binding, and too much floc in the filter influent.
하 , 폐수처리장 유입 및 유출수의 유기오염물 지표 상관성에 관한 연구
임경호(Kyeong Ho Lim),김광수(Kwang Soo Kim) 한국수처리학회 2002 한국수처리학회지 Vol.10 No.1
N/A In this study, correlations between COD_Cr, COD_Mn and BOD of samples from domestic and industrial wastewater treatment plants were investigated to set up the basic guideline for altering the index of organic matter content from COD_Mn to COD_Cr. In the case of domestic wastewater, BOD was more favorable for the estimation of organic matter content than COD_Mn and COD_Cr because microbial products which had no harmful effect on the environment, were counted as organic pollutant during COD test. However, in the case of industrial wastewater, COD_Mn and COD_Cr were suitable because organic and inorganic toxic pollutants inhibited microbial respiration during BOD test. It could be suggested that COD_Cr became meaningful after the installation of advanced treatment processes such as activated carbon in the industrial wastewater treatment plant.
연구보문 : 토양환경; 녹비작물의 파종시기와 방법이 무농약 배과원의 시기별 토양화학성과 엽내 무기성분, 과실품질에 미치는 영향
임경호 ( Kyeong Ho Lim ),최진호 ( Jin Ho Choi ),김월수 ( Wol Soo Kim ),김현지 ( Hyun Ji Kim ),송장훈 ( Jang Hoon Song ),조영식 ( Young Sik Cho ),임순희 ( Sun Hee Yim ),정석규 ( Seok Kyu Jung ),최현석 ( Hyun Sug Choi ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.1
BACKGROUND: This study was conducted to investigate the effects of seeding timing and method of rye and/or hairy vetch on seasonal soil and foliar nutrient concentrations as well as fruit quality in a pesticide-free pear orchard. METHODS AND RESULTS: The treatments included as followed: single seeding of rye in September (Sep-Mono), November (Nov-Mono), and January (Jan-Mono), or mix seeding of rye+hairy vetch in November (Nov-Mix) and January (Jan-Mix), or sod culture as a control. Cover crops or vegetation was mown and mulched on the soil surface in April and May for two years. Nov-Mix treatment produced the highest dry matter weight of 12,070 kg ha-1, with the lowest dry matter weight for sod culture (6,520 kg ha-1), following Jan-Mix (7,030 kg ha-1). Nov-Mix treatments increased potential amount of N, P, and K from the raw materials of the cover crops as well as improved soil physical properties. Nov-Mix treatments overall elevated soil pH, EC, organic matter, and P2O5 in May compared to other cover crop treatments or sod culture. The difference of the seasonal nutrient concentrations in leaves or fruit qualities were not consistently occurred amongst treatments. CONCLUSION: Nov-Mix treatments showed playing role in a substitute of a chemical fertilizer. Delayed seeding of cover crops such as Jan-Mix did not increase the potential dry matter production due to the short growing period, and the seeding time would affect the dry matter production of cover crops.
연구보문 : 피복작물 이용방법이 양분공급량과 배 과실품질에 미치는 영향
임경호 ( Kyeong Ho Lim ),김월수 ( Wol Soo Kim ),최현석 ( Hyun Sug Choi ),이인 ( In Lee ),조원기 ( Won Ki Cho ),구희연 ( Hui Yeon Koo ),이연 ( Youn Lee ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.3
This study was conducted to evaluate the effects of ground cover treatments on the nutrient contribution of the cover crops and fruit quality of ``Niitaka`` pear (Pyrus pyriforia) trees, in order to develop utilization of the ground covers as an organic nutrient source in a pear orchard. The study was conducted at diligent farmer in Boseong in Chonnam, and the treatments included; 1) sod culture, 2) winter cover crop [ryegrass+hairy vetch], and 3) winter [ryegrass+hairy vetch]+summer [green solgo(sudan grass (Sorghum bicolor L.))+nemajanghwang (crotalaria (Crotalaria juncea L.)] cover crops. Winter+summer cover crops provided greater amounts of residue, followed by winter cover crop and sod culture. The difference of amounts of residue from the ground cover treatments affected to the total N, P, and K contents in the soil, which were greater nutrient levels than those of recommendation of a conventional pear orchard. Greater amounts of residue from the ground covers increased organic matter and concentrations of K, Ca, and Mg in soil. Fruit quality was not affected amongst ground cover treatments.