전문가 조언-추석 연휴 전후 CTP 관리요령

김택준,Kim, Taek-Jun 대한인쇄문화협회 2006 프린팅코리아 Vol.52 No.-

상수처리 : 낙동강수계 BAC 여과지의 사용기간 및 재생차수에 따른 효율분석

김현실 ( Hyun Sil Kim ),나영신 ( Young Shin Na ),류동춘 ( Dong Chun Ryu ),김대영 ( Dae Young Kim ),김택준 ( Taek Jun Kim ),송영주 ( Young Joo Song ),김창원 ( Chang Won Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2009 공동 추계학술발표회 Vol.2009 No.-

슬러지 배출공정 최적화를 통한 탈수케이크 함수율 저감에 관한 연구

류동춘,김택준,나영신,이광욱,이재율,주대형,류병순,Ryu, Dong-Chun,Kim, Taek-Jun,Na, Yeong-Sin,Lee, Gwang-Uk,Lee, Jae-Yul,Ju, Dae-Hyeong,Ryu, Byeong-Sun 한국상하수도협회 2006 한국상하수도협회지 Vol.16 No.-

고도정수처리공정에서 브로메이트의 생성 및 제거특성

박현석 ( Hyun-seok Park ),이희숙 ( Hui-suk Lee ),김택준 ( Taek-jun Kim ),최영익 ( Young-ik Choi ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.2

고도정수처리에서 오존반응은 여러 가지 부산물을 생성시킨다. 원수 내 브롬이온에 의해 생성되는 브로메이트(BrO₃^-)는 발암물질로 알려져 있다. 따라서 우리나라에서는 2011년 1월부터 먹는물 수질감시항목으로 지정하였다. 해양도시인 부산의 경우 원수 내 브롬이온이 쉽게 증가되고 오존반응에 의해 브로메이트가 증가된다. 그래서 브롬이온과 브로메이트의 감시가 필요하다. 본 연구에서 오존 및 고도산화(오존+과산화수소)와 입상활성탄여과 간이실험을 하였다. 그 결과 브로메이트가 낮은 경우에 브로메이트생성비(브로메이트생성농도/감소한 브롬이온농도)가 약 0.2로 나타났다. 브롬이온농도가 1 ㎎/L 이상인 경우 브로메이트생성비가 낮고 거의 일정하였다. 이는 감소한 브롬이온이 브로메이트을 생성시키지 않고 OH라디칼과 탄산이온과 브롬이온의 반응에 의해 탄산과 브롬(Br₂)으로 전환되기 때문인 것으로 사료된다. 고도산화실험에서는 보로메이트생성비가 과산화수소수의 적정한 주입농도에 의해 감소하였다. 오존농도가 2 ㎎/L보다 낮은 경우 브로메이트생성비를 최소화 시키는 과산화수소수/오존 적정비가 0.2 이였으며, 오존농도가 2 ppm 이상에서는 0.1~0.2의 범위를 나타내었다. 입상활성탄 여과실험의 경우 EBCT에 관계없이 신탄에서 브롬이온과 브로메이트는 완전히 제거되었으며, 재생탄에서는 브롬이온 10%와 브로메이트 60%를 각각 제거할 수 있었다. 따라서, 부산의 경우 원수 내 브롬이온이 평균 0.06 ㎎/L으로 낮기 때문에 정수처리공정상 브롬이온의 문제는 발생되지 않을 것으로 예상된다. Ozonation in the advanced water treatment system creates several by-products. Bromate(BrO₃^-) formed by bromide in the raw water is known as cancerogenic substances. Therefore it is appointed Standard Water Quality Watch Item from January 2011 in korea. In case Busan city as a coast city, it is more likely to increase bromide concentrations in the raw water and to increase bromate by ozonation. Therefore, monitoring of bromide and bromate is required. In this study, an pilot experiment on ozone and advanced oxidation process(AOP: ozone + hydrogen peroxide) and a gradual activated carbon filtration was developed. Results showed that in the case of low bromide concentration, forming ratio of bromate(bromate concentration/decrease concentration of bromide) was 0.2 approximately. In case of bromide over 1 ㎎/L, forming ratio of bromate was low and uniform nearly. The reason is that decreased bromide is not formed bromate but it turns into carbonic acid and bromine(Br₂) by reaction of carbonic ion and bromide with OH radical. In the experiment of the AOP, forming ratio of bromate deceased by suitable inlet concentration of hydrogen peroxide. In case below ozone concentration of 2 ㎎/L, suitable ratio of hydrogen peroxide/ozone was 0.2 for minium ratio of forming bromate and was 0.1~0.2 in over ozone 2 ppm. In the case of gradual activated carbon(GAC) filtration, the virgin granular activated carbon(GAC) could remove a bromide and bromate perfectly regardless of a empty bed contact time(EBCT). The reactivated GAC could remove bromide of 10% and bromate of 60%, respectively. In conclusion, in the case of Busan city, there is no possibility of bromate problem occurrence in the clean water because bromide concentration in raw water is low as average 0.06 ㎎/L.

CFD를 이용한 플록큐레이터 회전방향에 따른 플록형성지 유동 평가

조영만(Young Man Cho),유수전(Soo Jeon Yoo),노재순(Jae Soon Roh),김택준(Taek Jun Kim),김창원(Chang Won Kim) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.5

정수처리공정에서 안정적인 탁도 관리가 날이 갈수록 중요해지고 있다. 따라서 침전 효율 향상을 위한 플록형성 공정의 최적화는 매우 중요하다. 우리는 전산유체역학적 방법을 이용하여 플록큐레이터의 회전방향(시계방향, 반시계방향)에 따른 플록형성지 내 유동특성을 평가하였다. 평가 결과, 플록큐레이터가 시계방향으로 회전하는 경우는 플록큐레이터 회전방향과 수류 흐름이 일치하는 수표면 쪽에서 유동이 강해지고 유출량의 분산 및 표준편차는 각각 8.5, 2.9로 나타났다. 반면에 플록큐레이터가 반시계방향으로 회전하는 경우는 플록큐레이터 회전방향과 수류 흐름이 일치하는 바닥 쪽에서 유동이 강해지고 유출량의 분산 및 표준편차는 각각 5.3, 2.3으로 나타났다. 또한 플록형성지 유출량은 1,2단 플록큐레이터 회전방향보다는 3단 플록큐레이터의 회전방향에 의해 주로 영향을 받으며 3단 플록큐레이터가 반시계방향으로 회전하는 경우가 시계방향으로 회전하는 경우보다 유출량의 편차가 적기 때문에 침전지의 균등한 흐름을 위해 유리하다. With time, the stable management of turbidity is becoming more important in the water treatment process. So optimization of flocculation is important for the improvement of the sedimentation efficiency. we evaluated the hydrodynamic behavior in the rotation direction (clock-wise, counterclock-wise) of the flocculator in the flocculation basin using Computational Fluid Dynamics (CFD). The results of the CFD simulation, in cases where flocculators rotate in a clockwise direction, a stronger flow is formed near the surface of the water where the rotating direction and current of flow correspond. The variance and standard deviation of the flux are about 8.5 and 2.9 respectively. In contrast, in the case of a counterclockwise direction, a stronger flow is formed near the bottom of the basin. The variance and standard deviation of the flux are about 5.3 and 2.3, respectively. The effluent flux is affected more by the third flocculator spin than the first and second flocculator spins. The third flocculator spinning in the counterclockwise direction is better for the uniform flow of the sedimentation basin than the third flocculator spinning in the clockwise direction.

오존 및 염소처리공정에서 소득부산물의 생성특성

이희숙 ( Hui Suk Lee ),박현석 ( Hyun Seok Park ),김택준 ( Taek Jun Kim ),한영립 ( Young Rip Han ),정병길 ( Byung Gil Jung ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.3

Most disinfection byproducts(DBPs) in water treatment process are formed by means of a pretreatment step such as the prechlorination and preozonation. Recently, it needs much research for a bromide substitution reaction in the DBPs because the enhancing water quality standard about bromine DBPs. And There is the difference in the formation characteristics of bromine compounds in trihalomenthans(THMs) and haloaceticacids(HAAs). So, this study was performed to investigate the THMs and HAAs in the chlorinated DBPs for the influence of the DBPs formation according to variation of raw water characteristics, water temperatures and concentrations of disinfectants and coagilants. As a result, the concentrations of CHBrCl2 in the THMs was higher with a decrease in water temperature. However CHCl3 was higher with an increase in water temperature at the pretreatment. In HAAs, tricholiacetic acid(TACC) was formed the more than dicholoacetic acid(DCAA) with an increase in water temperature. Bromine incorporation factor(BIF) of THMs and HAAs was affected by water temperature but it was not affected by a species and amount of the aluminum coagulant. Also, the BIF of the HAAs was affected the more by a specific ultraciolet absorbance(SUVA) than water temperature.

Wistar종 흰쥐간의 δ-Aminolevulinate Dehydratase의 정제 및 성상

김택준,정규철 중앙대학교 의과대학 의과학연구소 1980 中央醫大誌 Vol.5 No.1

δ-Aminolevulinate dehydratase (δ-ALAD; EC 4.2.1.24) was purified from liver homogenate of Wistar strain of rats more than 300 folds with a 22.3% yield by a modification of the procedure of Doyle and Schimke and its physicochemical and kinetic properties were partially characterized as follows. 1. The purified enzyme preparation had a specific activity of 54.4 units/㎎ of protein, which was 5∼6 folds as activity as those purified from ICR mouse liver homogenate. 2. the enzyme had optimum catalytic at pH 7.0 in phosphate buffer and its Km value was 3.0×10^-4 M. It also found that the enzyme was relatively heat stable. 3. The enzyme was relatively stable by storage. The purified enzyme could be stored at 4℃ for 7 days without significant loss of activity, showing half­life of 40 days. The enzyme stored frozen at -10˚ or -30℃ for 50 days maintained their original activity without any evidence of decrease of enzyme activity. 4. Activity of the purified enzyme decreased linearly relative to the frequency of the freezethawing when it was kept frozen at -30℃ in a deep freezer and thawed at a room temperature up to 20 times. 5. After the DEAE­cellulose column chromatography in the purification procedure no enzyme activity was shown unless the preparation was previously activated with a thiol reagent, β­mercaptoethanol. Maximal activity was obtained with addition of the reducing reagent in concentration of 20 and 100mM. However, the activity was decreased drastically above 100mM. On the contrary, the enzyme activity was inhibited in inverse proportion by increasing concentration of iodoacetamide in the reaction mixture, which suggests that sulfhydryl group was required for the enzyme activity and cystein in the active site is implicated in the catalytic function of the enzyme molecule. 6. Molecular weight of the δ-ALAD was estimated to be 270,000 and 269,000 respectivelly, by both the Sephadex gel filtration and polyacrylamide disc gel electrophoresis.

약사의 피로자각증상

이해진,김택준,전정일,구정완,정치경 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.1

In order to investigate industrial fatigue of pharmacists, the questionnaire survey for subjective symptoms and its related factors was carried out on 435 pharmacists who were managing pharmacies in Seoul. The questionnaires were composed of three groups of 10 items each, representing dullness and sleepness(Ⅰ), difficulty in concentrations(Ⅱ) and bodily projection of fatigue(Ⅲ). The results were as follows : 1. The complaint rate of fatigue was the highest in 'eye strain' and followed by 'whole body tires', 'apt to forget', 'leg feel heavy', 'feel drowsy' and 'feel like lying' in the descending order. 2. The average weighted score of fatigue complaint was the highest in dullness and sleepness group(Ⅰ) and followed by difficulty in concentrations group(Ⅱ) and bodily projection of fatigue group(Ⅲ) in the descending order, suggestion the heavier mental stress rather than physical burden of the pharmacists work contents. 3. The average weighted scores of fatigue complaints were significantly higher in female and 0-3 off-duty days per month group than those in male and more than 4 off-duty days per month group. 4. The average weighted scores of fatigue complaints were significantly different among the characteristic groups of counselling postures, noise and using chairs. 5. The groups with the high quality of sleeping, regular physical exercise and diet, or satisfied with their job and income had significantly lower average weighted scores of fatigue complaints. 6. The 42.5% of the subjects complained felling heavy chronic fatigue. And the significant differences for average weighted scores were noted among three groups, representing 26.64 in felling heavy chronic fatigue, 18.23 in feeling light chronic fatigue, and 9.50 in feeling no chronic fatigue.