통계방법에 의한 하수처리장 운전분석

이찬형,문경숙 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.3

Statistical analysis between sewage plant operating parameters and the effluent quality was performed. We extracted two factors from principal component analysis of operating parameters and effluent quality from each plant. The total variance of 84.7%, 79.2% was explained by the two factors at SB plant and SC plant, respectively. The factors were identified at SB plant in the following order 1) the oxidation of organic material by aeration basin microbe,2) biomass in aeration basin and at SC plant 1) the oxidation of organic material by aeration basin microbe, 2) thickening of acti-vated sludge. These results suggested that the control of microbial composition might be critical on the improvement of the effluent quality and plant operating efficiency because most of the factors were related with microbes.

Fabrication of energy saving film with anti smudge property

이찬형,함동석,조성근,김다혜,최우진,김광제,이상진,김대수,이재흥 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.4

고도처리 하수처리장 운전조건의 통계분석

이찬형,문경숙 한국환경과학회 2005 한국환경과학회지 Vol.14 No.2

Statistical analysis between operating parameters and effluent quality on advanced wastewater treatment plant was performed. Through factor analysis four factors derived varimax rotation were selected each plant. Four components explained 80%, 82% of the total variance of the process, respectively. The components on MLE plant were identified in the following order : 1) HRT increase and BOD load decrease by influent decrease, 2) Biomass, 3) SVI increase by internal return increase, 4) Microbial diversity by SRT increase. On A₂0 plant, we defined them as follows: factor 1, high MLSS by return rate increase, HRT increase by influent decrease; factor 2, biomass; factor 3, BOD of influent; factor 4 was relate to DO.

원생동물을 이용한 하수처리장의 수질 예측

이찬형,문경숙 한국산업미생물학회 2000 한국미생물·생명공학회지 Vol.28 No.6

Pilot Plant에서 도시하수가 처리되는 경우와 전처리 된 분뉴가 하수에 섞여 처리되는 두가지 종류의 하수를 표준 활성슬러지 공법으로 처리하면서 매주 2회씩 시료채집하여 원생동물의 종류 및 개체수와 처리수질을 조사하였다. 우점원생동물은 두 경우 모두 섬모충류였으며, 섬모층류, 편모충류와 아메바의 분포비가 높았다. 처리수질과 원생동물의 상관분석에서는 도시하수의 경우 양의 상관관계가 높게 나타난 경우가 많으며, 전처리 된 분뇨가 섞여 유입되는 경우는 음의 상관관계를 나타내는 경우가 다소 많았다. 회귀분석 결과, Pilot Plant A의 경우는 BOD = 4.490 × 10 exp (-4) × Total + 5.772 × 10 exp (-3) × Amoeba + 1.892 (Adjusted R^2=0.995)이며, Pilot Plant B는 BOD = 6.731 × 10 exp (-2) × Bodo + 0.306 (Adjusted R^2=0.864)의 회귀식을 얻었다. 저수온에서는 원생동물수가 35%로 줄어들며 Aspidisca속이 가장 많았다. 그러므로 원생동물은 하수처리장 유출수의 수질을 예측하는 지표로서 이용이 가능하다고 사료된다. Genera and number of protozoa were investigated in the conventional activated sludge pilot plant used for the treatment of municipal sewage and pre-treated night soil-containing sewage. In both cases, the predominant protozoa was ciliates and among them, Vorticella was the most common. In the pilot plant where pre-treated night soil was mixed with municipal sewage, genera of free-swimming ciliates, flagellates and amoeba was higher than in those without night soil. Correlation analysis on the quality of effluent and protozoa indicates that municipal sewage has positive correlation with protozoa. However, in the pilot plant of sewage containing pre-treated night soil more samples show negative correlation. Followed equations were derived by the regression analysis of BOD in both the pilot plants. In case of pilot plant A of municipal sewage, the analysis of BOD showed 4.490 × 10 exp (-4) × Total + 5.772 × 10 exp (-3) × Amoeba + 1.892 (Adjusted R^2=0.995) and in case of pilot plant B of municipal and pre-treated night soil-containing sewage, the analysis of BOD was 6.731 × 10 exp (-2) × Bodo + 0.306 (Adjusted R^2=0.864). At low temperature, number of protozoa was decreased to 35% and among them, Aspidisca was the most common genus. Therefore, protozoa can be used as indicator of quality of the effluent in sewage treatment plants.

iTECH 합성보-RC거둥 모멘트 접합부의 실험적 거동 평가 ( Structural Behavior of iTECH composite beam-RC column Moment Connection )

이찬형,주영규,김대영,정광량,김상대 대한건축학회 2002 大韓建築學會論文集 : 構造系 Vol.18 No.9

Fabrication of energy saving film by monodisperse

이찬형,함동석,조성근,김다혜,최우진,김광제,이상진,김대수,이재흥 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.10

대구지역 총 부유분진중 중금속

이찬형 한국환경보건학회 2003 한국환경보건학회지 Vol.29 No.1

This study was carried out to characterize the behavior and sources of particulate trace metal in Daegu city. TSP (Total Suspended Particulate matter) was collected by filters on High Volume Air Sampler from the four areal (reference, residential, commercial, industrial area). The moult were analyzed by AAS after preliminary treatment. The average centration trend of trace metals contained in TSP was shown as follows : Fe > Cu > Pb > Mn > Ni > Cr > Cd. The trace metals showed the highest concentration in the industrial area. This study showed the seasonal variation of trace metals. Fe and Mn showed high concentration in spring, whereas Cr, Ni, Cd and Pb showed high concentration in winter. Also this study showed the regional variation of trace metals. The order of the average concentration of trace metals was : industrial > commercial > residential > reference area. Using Mn as a reference element, the enrichment factor analysis were used for identifying the trace element contributors. The enrichment factors of Cr, Fe < 10 were considered to have a significant dust and soil source and termed nonenriched. Pb, Cd, Cu >>10 were enriched and had a significant fraction which was contributed by anthropogenic sources.

Predictive Factors of Therapeutic Intervention in On-call Endoscopy for Gastrointestinal Bleeding

이찬형,윤혁,최윤진,장은선,김재환,신철민,박영수,황진혁,김진욱,정숙향,김나영,이동호,김주성 대한내과학회 2018 대한내과학회 추계학술대회 Vol.2018 No.1

하수처리장의 원생동물 천이

이찬형,문경숙,진익렬 한국미생물·생명공학회 2004 한국미생물·생명공학회지 Vol.32 No.2

This study concerns the succession process of protozoa populations in two activated sludge pilot plants. Protozoa populations with similar structures developed and succeeded each other in two plants. It was observed that initial sludge inoculum did not influence the protozoan composition but shorten the period of the plant stabilization. It seemed the protozoan in aeration tank was come from the influent. The composition of the influent sewage influenced the structure of protozoa in the pilot plants. The flagellates was very abundant during the initial starting phase. These rapidly decreased after growth peak. Then sarcodina, ciliates were increased in succession. In ciliates, free-swimming forms appeared at first and crawling forms and stalked forms were followed. After 36 days from the start, the sludge stabilization phase was characterized by a populations of ciliates dominated by stalked and crawling type and low value of effluent BOD was achieved. Pilot Plant에서 도시하수가 처리되는 경우와 전 처리된 분뇨가 하수에 섞여 처리되는 두 가지 종류의 처리장하수를 대상으로 식종과 무식종의 경우로 나누어 활성슬러지의 정착 단계까지 조사하였다. 원생동물의 천이과정은 편모충류, 육질충류, 섬모충류 순이며, 섬모충류 내에서는 자유 유영형이 먼저 출현하고 포복형과 고착형이 차츰 증가하여 활성슬러지 원생동물상을 구성한다. 정상적으로 가동되는 처리장 포기조의 원생동물분포는 시운전초기단계의 원생동물 분포와 다르며, 시운전 안정화 단계에서의 원생동물 분포와 유사하였다. 포기조의 원생동물은 유입수에서 유래하는 것으로 판단되며, 포기조에 유입된 후 환경조건에 맞는 종이 증식하여 활성슬러지를 구성한다. 슬러지식종은 활성슬러지 원생동물 군집구조 형성에 영향을 미치지 못했으나 활성슬러지의 안정화기간을 다소 단축시키는 효과가 있었다. 처리장별로 활성슬러지 원생동물의 종류는 비슷하나 개체수는 달라 유입수의 성상에 영향을 받는 것으로 판단된다. Pilot plant 가동 후반기에는 섬모충류 비율이 70%전후, 개체수도 3,000~5,000 개체/ml이며, 유출수의 BOD 농도도 안정적으로 나타나 정상적으로 가동된다고 판단된다.

대구지역 가로수잎의 중금속

이찬형,윤현숙,박연준,권종대,노기철,장성환 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

This study was conducted to determine the contents of heavy metals in leaves of roadside trees according to different growth stages in Daegu city. The orders of heavy metal contents in leaves of roadside tree and soil were Fe〉Mn〉Zn〉Pb〉Cu〉Cr〉Cd and Fe〉Mn〉Zn〉Cu〉Pb〉Cr〉Cd, respectively. The contents of heavy metals in leaves of roadside trees and soil showed an increasing tendency as the levels of traffic volume increased. The contents of heavy metals in leaves on October were higher than those on May.