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문백수 ( Bag Sou Moon ),김명희 ( Myeong Hee Kim ),황태문 ( Tae Mun Hwang ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.4
The capacity of the high power pulsed-UV light system was evaluated in terms of removing THMs, geosmin and heterotrophic bacteria in water. The operating conditions of the system were irradiation distance; 10cm, operation voltage; 1,720V and irradiation time; 10min. The removals of THMs, chloroform, bromodichloromethane, dibromochloromethane, bromoform and geosmin were 59.0%, 46.9%, 76.7%, 100.0%, 100.0% and 95.4% respectively. The removal of heterotrophic bacteria was 3.7log in case of irradiation distance; 20cm, operation voltage; 1,500V, and irradiation time 2min. The system was also investigated for its ability to reducing free residual chlorine. The removal efficiency could be improved by increasing the operation voltage, the operation time, number of lamp and the length of the lamp.
진공 막증류법에서의 무기염에 의한 막오염 제어에 관한 연구
황태문 ( Tae-mun Hwang ),장은경 ( Eun-kyun Jang ),구재욱 ( Jae-wuk Koo ),남숙현 ( Sook-hyun Nam ),김은주 ( Eun-ju Kim ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.5
High concentration of calcium ion, sulfate ion, bicarbonate ion in SWRO(Seawater Reverse Osmosis) brine, calcium sulfate and calcium carbonate can be formed during treating SWRO brine. In addition, the solubility of calcium sulfate and calcium carbonate is very low, accordingly, the scale formation is unavoidable problem when SWRO brine is treated by VMD(Vacuum Membrane Distillation) and can be main obstacle for VMD to apply to desalination and other treatment. Thus, This study was carried out to evaluate anti-scalant and acidic agent to control inorganic membrane fouling in the lab-scale VMD system. Saturated CaSO<sub>4</sub> and CaCO<sub>3</sub> solution were used as a model scalant. In the case of anti-scalant injection of high concentration TDS solution containing model scalants, the time of the scale foramtion was shorter as the TDS concentration increases. Also, in the VMD filtration experiment, a sharp decrease in permeate flux was observed at about VCF(Volume Concentration Factor) 1.5. Comparing the change of the permeation flux before and after the injection of the anti-scale agent, the scale formation was delayed by about VCF 0.2 when the anti-scale agent was injected. Although the scale inhibitor has an effect of delaying scale formation, it can be confirmed that the effect is insufficient. On the other hand, the experimental results of membrane cleaning using distilled water showed that the permeate flux was temporarily restored, but membrane wetting occured in a short time. Acid flushing with 5% hydrochloric acid did not cause membrane wetting, and permeate flux was stably maintained. As a result of the analysis of the membrane surface, it was confirmed that all the scale substances on the membrane surface were removed.
황태문 ( Tae-mun Hwang ),남숙현 ( Sook-hyun Nam ),김은주 ( Eun-ju Kim ),구재욱 ( Jae-wuk Koo ),한홍식 ( Hongsik Han ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.5
The water treatment simulator can be used for the design, diagnosis and optimization of water treatment process. It is a mathematical and statistical model based representation of physical and chemical process. Until now, commercial drinking water treatment simulator program has a disadvantage that numerical analysis algorithms are not included for ozone, ultraviolet AOP, nanofiltration and reverse osmosis membrane technology, which are recently introduced as advanced treatment technology in Korea. In this study, a new ozone CT simulation program was developed and evaluated for process design and diagnosis. The developed program can calculate ozone CT by various calculation methods such as CT10, CSTR, extended CSTR, Ceffluent T10 and extended integrated CT10. It is advantageous to evaluate the ozone CT value with the data measured in the field because the decomposition characteristics of ozone are very rapid according to the raw water properties. Therefore, it is possible to control the real-time disinfection potential monitoring and operation optimization by linking the developed program with the ozone decomposition rate measured in the field.
황태문 ( Tae-mun Hwang ),이광희 ( Kwanghee Lee ),김유곤 ( Yoogon Kim ),정유미 ( Youme Jung ),윤여준 ( Yeojoon Yoon ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.4
Pathogenic and/or invasive organisms are problematic in ballast water, desalination plants and aquaculture systems for both ecological and economic reasons. In a desalination plant, the presence of microorganisms can lead to biofouling of the ultrafiltration and seawater reverse osmosis membrane equipment. Meanwhile, in the aquaculture industry, some pathogenic organisms cause serious fish diseases, which can result in mass die-offs. Various disinfection techniques such as ozonation, ultraviolet irradiation, electrolysis and chlorination, have been applied to remove pathogenic organisms from seawater environments. The purpose of this study was to develop a kinetic model for the prediction of residual ozone and bromine concentrations in seawater following ozonation, taking into consideration the ozone dose, water salinity, and pH. Ozone chemistry in saltwater is considerably different from that in fresh water because saltwater contains much higher concentrations of dissolved anions and cations (e.g., chloride, bromide, magnesium, sulfate) than fresh water. Salinity greatly affects the formation of residual ozone and bromine during saltwater ozonation. Unlike freshwater ozonation, there is no hydroxyl radical formation in seawater ozonation because ozone decomposition is considerably faster in water containing bromide. Therefore, seawater ozonation involves the initial unstable oxidant (ozone) and a secondary, more stable oxidant (bromine) for disinfection. This study also aimed to evaluate the performance of ozone and bromine disinfection using E. coli. The log inactivation of E. coli with ozone and bromine was 2.5 and 4 log, respectively. The log inactivation of E. coli with seawater ozonation was 5.8 log.
문백수 ( Bag Sou Moon ),김명희 ( Myeong Hee Kim ),황태문 ( Tae Mun Hwang ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.1
This study was carried out to develop UV/Vis Spectrophotometer method for quantitation of formaldehyde in drinking water . The detection was performed at the wavelength 425 nm by using 2,4-pentanedione(acetylacetone). In the direct method, the correlation coefficient of absorbance versus concentration was 0.9999. The precision of this method showed the relative standard deviations of 0.9~5.9 %. The limit of detection(LOD) and quantitation(LOQ) was 62 ㎍/L and 190 ㎍/L, respectively. The recovery ratios were 97.3~103.3 % at the range above LOQ. In the solid phase extraction method using AutoTrace SPE Workstation to automate sample pretreatment, the correlation coefficient of absorbance versus concentration was 0.99. The precision of this method showed the relative standard deviations of 1.9~11.0 %. The of detection(LOD) and quantitation(LOQ) was 2.6 ㎍/L and 7.9 ㎍/L, respectively. According to correlation, recovery ratio, and precision studies, this acetylacetone method was shown to be quantitative to formaldehyde, rapidly and accurately. It is considered that in water supplies or water treatment process, formaldehyde can be easily analyzed by using UV/Vis spectrophotometer belonging to the water purification plant.