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전기분해 장치 및 펄스 UV를 이용한 잔류염소 생성과 제거에 관한 연구
문백수 ( Bag-su Moon ),김준현 ( Jun-hyun Kim ),황태문 ( Tae-mun Hwang ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.3
Free chlorine produced with electrolysis of water can be a very useful disinfectant for the removing pathogen microorganism. This study presents the evaluation of free chlorine generation and reduction by electrolysis without adding salts and pulse UV hybrid system. In this study, 11 insoluble electroded plants were installed in the electrolytic cell and a current of 5 A~50 A was supplied using retifier which is a DC power supply device. The electrode plates used in this experiment were installed at intervals of 3 ㎜between the oxidizing electrode and the reducing electrode. The production of residual chlorine by electrolysis increased in proportion to the applied current. As a result of repeated experiments at the flow rate of 5 L/min and 35 A for the stability test, residual chlorine had an average of 9.22 ㎎/L, standard deviation of 0.10 ㎎/L and relative standard deviation of 1.04 %. Power consumption to produce 1 mg/L of residual chlorine at 5 L/min was 11.7 W. It was evaluated that the residual chlorine was removed in proportion to the applied voltage during the pulse UV irradiation. At 1.0 m3/hr of flow rate, 1 ㎎/L of residual chlorine decreased to 0.5 ㎎/L when irradiated with 820 V pulse. Residual chlorine concentration of 3 mg/L was completely removed at 1540 V irradiation. There was no change in water temperature according to the applied voltage of pulse UV irradiation, and UV254 was decreased in proportion to the applied voltage. The by-products generated by generated residual chlorine in the reactor such as trihalomethanes(THMs) and haloacetic acids(HAAs) were detected in less than a water quality standards.
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.
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.
정수처리를 위한 전기분해 적용시 잔류염소 생성에 관한 연구
문백수 ( Bag Sou Moon ),황태문 ( Tae Mun Hwang ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.1
There are increased activities in development and application of directly electrolysed water using the natural chloride content for disinfectants production. Free chlorine produced with electrolysis water can be a very useful disinfectant for the removing pathogen microorganism. The present works presents the evaluation of free chlorine generation and THMs characteristics during and after electrolysis. All electrodes were titanuim based insoluble materials and rectangular plate with an effective area of 50 ㎝×20 ㎝. Electrolysis reactor composed of the six negative electrodes and the five positive electrodes. Directly electrolysis reaction using the natural chlorine content in sand filtered water generated the free chlorine for feasible disinfectant. The residual chlorine be generated 1.0 ㎎/L in current density 3.8 A/㎠ and flow 5.0 L/min. the generated free chlorine concentration was stable. Electricity was exponentially increased with flow increment for the chlorine formation. Specific chlorine value which means the generated chlorine rate per current density was 1.60 at the flow of 15 L/min. Chlorine concentration of 1 ㎎/L was stably generated above 1.0 current density and below 30 sec retention time for chlorination concentration of 1 ㎎/L. The by-products generated by high concentration residual chlorine in the reactor such as trihalomethanes were detected in less than a water quality standards.
윤성호(Sung Ho Yoon),황태경(Tae Kyung Hwang),윤남균(Nam Gyun Yun),문순일(Soon Il Moon) 한국복합재료학회 2002 Composites research Vol.15 No.1
본 연구에서는 내열 특성과 구조적인 특성을 갖는 탄소섬유/페놀릭 복합재 내열튜브를 필라멘트와인딩 공법에 의해 제작하고 이들의 구조적인 성능을 평가하였다. 이를 위해 내열튜브의 제작방법을 소개하고 황산용해법을 적용하여 내열튜브에서의 섬유체적비와 기공함유율을 측정하였다. 시편폭을 달리한 인장시편의 기계적 특성을 평가함으로써 강화섬유의 연속성을 나타낼 수 있는 시편형상을 제시하였으며 공정변수를 달리한 내열튜브에서 채취된 인장시편의 기계적 특성을 평가함으로써 내열튜브의 제작을 위한 적절한 공정조건을 결정하였다. 그리고 보증시험을 통해 수집한 음향신호의 분석을 통해 내열튜브에서의 균열진전과 파손양상을 조사하였다. 마지막으로 내열튜브 자체에 대해 보증시험과 파열시험을 수행함으로써 내열튜브 자체의 구조적인 신뢰성을 확인하였다. Composite ablative tubes required capabilities of ablative and structural characteristics were fabricated through filament winding technique and several experiments were conducted to evaluate the structural performance of composite ablative tubes. For thsi purpose, manufacturing procedures were briefly described and then resin digestion method was applied to measure the fiber volume fraction and the void content of composite ablative tubes. The configuration of tensile specimen for composite ablative tubes with not losing the continuity of reinforced fibers was suggested by evaluating mechanical properties of several types of the specimen with different widths. Also, suitable processing variables for composite ablative tubes were determined by evaluating mechanical properties of several types of the specimen with different processing variables. In addition, acoustic emission signals were obtained during the proof test and could be applicable to study the crack initiation and the damage mode of composite ablative tubes. Finally, the structural reliability of composite ablative tubes could be verified to satisfy design requirements through the proof and burst tests.