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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
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.
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.
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.
호밀과 헤어리베치의 파종시기가 녹비작물의 생육과 양분 공급량에 미치는 영향
임경호(Kyeong-Ho Lim),최현석(Hyun-Sug Choi),김현지(Hyun-Ji Kim),김병삼(Byeong-Sam Kim),김도익(Do-Ik Kim),김선곤(Seon-Gon Kim),김종선(Jong-Sun Kim),김월수(Wol-Soo Kim),이연(Youn Lee) (사)한국생물환경조절학회 2011 생물환경조절학회지 Vol.20 No.2
본 연구는 유기재배 배 과수원 시비에 있어서 화학 비료 대체를 위한 녹비작물 재배 이용기술 개발을 확립하고자 호밀과 헤어리베치의 파종시기에 따라 녹비 작물의 생육과 양분 공급량에 미치는 영향을 구명하기 위해서 수행되었다. 녹비직물의 파종시기는 2008년 9월 27일, 10월 15일, 11월 8일, 12월 10일로 나누어서 전남 보성의 배 과수원 독농가에 처리하였다. 관행 방임 초생 재배구는 대조구로 선정하였다. 호밀의 생육은 파종시기에 따라 별다른 차이 없이 비슷한 경향이었으나 헤어리베치는 파종 시기가 늦을수록 초장이 짧아지고 엽수와 줄기수가 감소하였고 건물중에도 그러한 비슷한 경향이 관찰되었다. 9월 하순 녹비처리는 관행 방임 초생 재배구에서 생산한 362㎏/10a의 건물 중 보다 2.6배 높았다. 파종시기별 전질소 농도는 파종 시기가 늦을수록 증가하는 경향이었으며, 전질소 환원량은 파종 시기가 빠른 9월 하순처리가 16.9㎏/10a 으로 관행대비 2.6배 높았다. 인산 환원량은 10월 중순 파종이 가장 높았으며, 칼륨 환원량은 파종 시기가 빠를수록 증가하는 경향을 나타내었다. This study was conducted to evaluate the effects of seeding time of ryegrass + hairy vetch on the nutrient contribution and growth of the crops, in order to develop utilization of cover crops as an organic nutrient source in a pear orchard. The study was conducted at a diligent farmer in Boseong in Chonnam, and the both ryegrass and hairy vetch applied on 1) 27 September, 2) 15 October, 3) 8 November, and 4) 10 December of 2008 as a cover crop treatment. Sod culture was refereed as a control. Growth of ryegrass was not affected by seeding time, but hairy vetch had fewer leaf and shoot number as seeding time advanced from September to December, and the similar trend was observed for the dry weight of the crops by seeding time. Seeding of cover crop on September was 2.6 times greater dry weight than those of the sod culture (362 ㎏/10a). Higher N concentration in cover crops occurred on early seeding time, and estimated N contribution from the cover crops was 16.9 ㎏/10a, which was 2.6 times greater than those of sod culture. P₂O? production from the cover crops was the greatest on seeding of October, and K₂O production increased at earlier seeding time.