http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전염소 투입 및 정수지 구조가 정수장 총소독능에서 갖는 중요성 평가
윤제용(Je Yong Yoon),변석종(Seok Jong Byun),최유식(Yu Sik Choi) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.3
Disinfection is one of the most important processes in water treatment plants since it protects consumers from waterborne diseases. In Korea, chlorine which is most frequently used as a disinfectant is generally applied in two ways: prechlorination and postchlorination. Postchlorination is to supply chlorine to the influent of a clearwell. While, prechlorination is to add chlorine to rapid mixing chamber or water intake in plants. Major disinfection reaction occurs in the step of post chlorination. Therefore, frequently, prechlorination is not counted on in evaluating disinfection credit. This study was conducted to evaluate the importance of prechlorination and the existence of baffling wall in clearwell with the United States disinfection requirement(Surface Water Treatment Rule). Eight water plants were considered. Yoon`s classification(1997) was selected in classifying the prechlorination practice in water treatment plant. It was found that most of the prechlorination practices performed in water plants(three out of four types) were not important in gaining any significant disinfection credit. One prechlorination practice conducted to remove ammonia in raw water became significant in meeting the disinfection requirement. Despite the existence of baffling walls of clearwell, T_(10)/T varied considerably in the range of 0.3-0.6, indicating that the existence of baffling wall itself does not guarantee the goodness of plug flow characteristics. For some plants, T_(10)/T were lower than that of US-EPA conservative recommendation which is considered when tracer test could not be performed.
국내 정수장에서 염소주입 특성 및 잔류염소 분포에 관한 연구
윤제용,변석종,이상덕 ( Je Yong Yoon,Seok Jong Byun,Sang Duck Lee ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
Chlorine is currently being used to control microorganism, odor, color and inorganics such as Fe, Mn in nearly all domestic water treatment plants. However, an overdose of chlorine can cause the formation of unexpectedly high disinfection byproducts(DBPs) such as trihalomethanes, besides being econonomically not sound. On the other hand, under dosage of chlorine may increase public health risk resulting from waterborne disease. Therefore, it is necessary to investigate the characteristics of chlorine dosage in water treatment plants to provide the proper guideline of chlorine practice. In this study, five water treatment plants were selected for investigating for characteristics of chlorine dosage and distribution of residual chlorine. Three major characteristics of chlorine dosage were found. First, for raw water with high ammonia concentration(3∼5㎎/L), a large quantity of chlorine was added to get rid of ammonia through breakpoint chlorination. Post-chlorination practice in this case becomes unnecessary because the chlorine residual prior to clear well is sufficiently high in maintaining chlorine residual in distribution system. Second, for the same type of raw water with first case in terms of ammonia content, only small amount of chlorine was added to the water two sites (as pre-chlorine & post -chlorine) to form the combined chlorine as residual chlorine. This type of chlorine practice is called as $quot;chloramination$quot;. Chloramination in Korea is unique in two ways. 1) naturally occurring ammonia was used far ammonia source 2) this was chosen due to the shortage of chlorine capacity not for the control of chlorinated byproducts. Third, for the water which does not contain high ammonia content, dual chlorine addition practice was selected. Pre-chlorination is performed to meet the chlorine demand of raw water. Post-chlorination is performed to maintain the proper residual chlorine in distribution system.
생물테러시 실내제독을 위한 효율적인 오존가스의 적용 방법
윤제용,정우동,문성민,조민,Yoon, Je-Yong,Jeong, Woo-Dong,Mun, Sung-Min,Cho, Min 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.2
This study attempted to develop the technology by gaseous ozone for decontaminating building affected by a model of biological weapon agent(Bacillus subtilis spores) instead of Bacillus anthracis spore. The use of ozone is attractive method from a practical point of view of decontamination procedure since it has strong oxidation power but no residue after application. We examined the disinfection efficiency of gaseous ozone to Bacillus subtilis spores which suspension was sprayed on different material surfaces and dried. Three different types of gaseous ozone was applied : dry ozone, dry ozone with humidified air, and water bubbled wet ozone. Dry ozone(1500ppm) failed to achieve any significant inactivation for 2hrs. However, six log reduction of B. subtilis spore was achieved within 30min by 1500ppm of water bubbled wet ozone. This result shows the noticeable inactivation efficiency by gaseous ozone compared with previous studies. Good performance by wet ozone was also found for military material surface.(i.e. : gas mask hood, protective garments, army peinted metal surface).
기존 정수처리 공정에서 트리할로메탄 생성 및 제거 특성에 관한 연구
윤제용,송명석 ( Je Yong Yoon,Myoung Suk Song ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
Trihalomethanes(THMs) are formed with the reaction of natural organic matter when chlorine is added as disinfectant in water treatment plant. This study was designed to evaluate the removal efficiency of THMs formation in the conventional water treatment plant with the use of Jar test simulation. The characteristics of THMs formation in each unit process of the K water treatment plant were presented. The formation of THMs in water treatment plant was predominant in the rapid mixing chamber and flocculation basin, and the relative ratio of THMs formation in the rapid mixing chamber and flocculation to that in settling basin ranged from 3.3 to 22.3. The estimated removal efficiency of THMs with Jar test results was 33∼58% which may be interpreted as that much of THMs formation precursor could be removed out in the conventional water treatment process. The aspect of the potential effectiveness of the conventional water treatment process for the control of disinfection by products may be considered in introducing the advanced water treatment process in the conventional water treatment plant. Chloroform was the most dominant species in THMs and Bromodichloromethane comprises of l/5 of the total THMs.
윤제용(Je Yong Yoon),변석종(Seok Jong Byun),이상덕(Sang Deok Lee),석관수(Kwan Su Seok) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.4
Disinfection process in water treatment plants is one of the most important step in order to inactivate waterborne disease. However, what is the necessary disinfection which has to be achieved in water plants was not properly established in Korea. In this study, we introduced the concept of CT values and evaluated CT in several water treatment plants to propose reasonable guidelines of necessary disinfection capabilities. The concept of CT was referred to the SWTR(Surface Water Treatment Rule) which is current US-EPA regulation. The necessary disinfection capability is expressed by CT which may be variable depending on the type of disinfectant, temperature, and pH etc. C is the concentration of disinfectant in the effluent of clearwell and T(=T-10) is the detention time at which 90% of the water passing through the unit is retained within the basin. Total of 8 water treatment plants(CJ, SS, BS, KG, BW, YC, KC, YJ) were intended to investigate the necessary disinfection capability in clearwell. For two of them, tracer study to find out T_(10) was not possible due to the unavailability of the port of chemical addition in the clearwell. It was found that T-10/T were varied widely from 0.2 to 0.5 even though all the clearwell in water treatment plants investigated were not baffled. For reference, T_(10)/T of 0.1 were given for unbaffled clearwell in terms of US-EPA recommendation. Considering the operation condition of plants and water quality characteristics at the time of study, 6 of water treatment plants successfully met the necessary disinfection capability based on 90% giardia removal. However, under the scenario of worst case which can be anticipated year round, nearly all the water treatment plants failed to meet CT requirements. Therefore, the necessities for adjusting disinfection process to the condition of various water quality were raised.
국내 정수장 정수 수질자료의 특성분석 ( 1994 년 - 1998 년까지 5 년간 자료를 중심으로 )
윤제용(Je Yong Yoon),조순행(Soon Haeng Cho),김해심(Hae Shim Kim) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
Water quality data from water treatment plants in Korea during 1994-1998 were investigated to find out the characteristics of their non compliance. The number of plants surveyed were approximately 600 and the number of samples were over 30,000. Ten parameters of water quality selected in this study and their non compliance % (inside parenthesis) were as follows : Heterotrophic plate count (0.14 %), Total coliforms (0.08%), NH₃-N (0.29%), NO₃-N (0.14%), THMs (0.02%), Turbidit(0.11%), Residual chlorine (5.5%), KMnO₄ consumption(0.04%), Hardness(0.03%), pH(0.07%). These levels of non compliance were compared to those obtained from WIDB (Water Industry Database, 1996) of American Water Works Association. This study strongly supported that small water plants ($lt;10,000 tons/day) were more vulnerable in meeting the regulation criteria of many water quality parameters such as Heterotrophic plate count, Total coliforms, NO₃-N, THMs, Turbidity, Residual chlorine, KMnO₄ consumption, Hardness and pH. The NH₃-N concentration was especially high in winter and its violation was frequently found in the specific areas such as the downstream of major rivers. The average THMs concentration was surprisingly low, indicating 13㎍/L which is 43% of US. Accordingly, these characteristics must be reflected in establishing the effective management of water quality policy of drinking water in Korea.