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회전원판 공법에서의 자산화 공정을 이용한 소규모 오 · 폐수처리
이찬기,류돈식 ( Chan Ki Lee,Don Sik Ryu ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
The objective of this study is to solve the problems related to the effluent quality in RBC process : media clogging and the biomass sloughing. Three stage RBC with Autoxidation phase was operated along with the existing three stage RBC operation by varying the operational parameters in order to compare removal efficiencies of organics and nitrogen. The BOD removal efficiencies in the three stage RBC with Autoxidation phase were over 95% at a organic loading of 98.4g BOD/㎡/day. The existing three stage RBC process showed a 95% removal at a organic loading of 49.2g BOD/㎡/day. Suspended solids removal efficiency was between 61 and 70 percent in the Autoxidation phase at 1st stage RBC by biomass sloughing, and that of the existing RBC was between 45 and 61 percent. Removal of ammonia-nitrogen determined by varying NH₃-N loading rate showed a 85.3∼92.1 percent in the Autoxidation phase and a 67∼76percent for the existing three stage RBC process. NO₃-N level in the effluent increased with decreasing influent loading. In the determination of the kinematic coefficient, area capacity constant(P) in the first stage Autoxidation phase of RBC was 39.9gBOD/㎡·day and half velocity constant(Ks) was 306㎎/L. In the existing three stage RBC, they were 46.6gBOD/㎡·day and 467㎎/L, respectively.
이찬기,김영래,Lee, Chan Ki,Kim, Young Rai 대한토목학회 1987 대한토목학회논문집 Vol.7 No.3
본(本) 연구(硏究)는 배뇨(排尿)슬러지를 퇴비화(堆肥化)시켜 유기물(有機物)의 감소(減少), 부식비도(腐蝕比度)와 퇴비화기간(堆肥化期間)을 알아보는데 그 목적(目的)이 있으며 실험실(實驗室) 반응조(反應槽)가 이용(利用)되었다. 실험(實驗)에 사용(使用)된 시료(試料)는 기뇨처리장(冀尿處理場) 슬러지로서 함수비(含水比)를 단계적(段階的)으로 변화(變化)시켜 퇴비화정도(堆肥化程度)를 알아보았다. 함수비(含水比)가 60%에서 퇴비화기간(堆肥化期間)이 약 10일(日)로 나타났고 COD는 37mg/l/day(lgr 건조 중량중)감소(減少)하였으며, C/N는 약 11~13, 부식비도(腐蝕比度)는 175정도(程度)로 나타났다. The purpose of this study was to know reduction of organic matter, degree of humification and composting period by corp. posting of night soil sludge. Laboratory reactor was used for this study. Samples being used in this experimentation was sludge of night soil treatment plant. The degree of composting was investigated by changing moisture content. The laboratory study indicated that the degree of humification was about 175, C/N ratio was about 11~13, composting period was about 10 days and COD reduction was 37mg/l/day in case of 60% moisture content.
호수내의 (好水內) 부양화현상 (富養化現象) 예측에 (豫側) 관한 연구
이찬기 ( Chan Ki Lee ) 한국하천호수학회 1977 생태와 환경 Vol.10 No.1·2
Excessive nutrients would create excessive growth of rooted and/or floating aquatic plants which in turn (a) may deplete dissolved oxygen (b) can cause undesirable taste and odors in water supplies and (c) can clog the waterways. This phenomenon has been called as eutrophication and carbon, nitrogen and phosphorus are known as the responsible elements for this problem. This study was made to develop a method predicting algae concentrations in the lakes by using the existing data from 10 lakes in Kyunggi Province. The first approach made was the material balance: The input manure and fertilizers in a catchment area must be adsorbed a certain amount through the land and the rest must be discharged into the lake in interest. The adsorbed amount of nutrients were 90.3 percent of nitrogen and 93.3 percent of phosphorus loaded per unit area. Among those nutrients; carbon, nitrogen and phosphorus, it was found that phosphorus level in a lake was the major critical element like those in the states. The phosphorus sedimentation rate was estimated to be about 63.19 to 6.29/year in the lakes in Kyunggi Province, while those lakes in the states were -25.7 to 22.4/year. The predicted algae concentration was computed to be about 0.375㎎/ℓ to 1.4㎎/ℓ.
고등학교 야구선수들의 부모지지와 진로의사결정유형 및 진로성숙도의 관계
이찬기(Lee, Chan-Ki),김지태(Kim, Ji-Tae),김현태(Kim, Hyun-Tae) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4
The purpose of this study was to examine the relationship among parental support, types of decision-making as to career and career maturity of high school baseball players. 217 high school baseball players in three different areas (Seoul, Gyeonggi-do, Choongnam) were selected as the participants by using cluster sampling method. For the instrument of this study, the corrected and/or supplemented data from the questionnaires used in the previous research were used. The questionnaires were distributed and collected by using a mail survey method through assistances from the baseball managers and coaches of the high schools in question. For the statistical analysis, correlation analysis and multiple regression analysis were used by using PASW Version 18.0. The followings were results of the study. First, the high school baseball players’ parental support had a significant influence on the decision-making as to caree. Second, the high school baseball players’ parental support had a significant influence on the career maturity. Third, the types of decision-making as career of the high school baseball players had a significant influence on the career maturity. This should be deemed meaningful in that it provides basic data that are necessary for creating a positive way of thinking when high school baseball players select their career path.