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고도처리공정에서 다양한 수질에 따른 미량유기오염물질 제거특성
유영범 ( Young Beom Yu ),김충환 ( Chung Hwan Kim ),권순범 ( Soon Buhm Kwon ),최양훈 ( Yang Hun Choi ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.5
Mobile Water Treatment Plant (MWTP) was evaluated for operational parameters, design values and especially removal efficiency of taste and odor compounds (T&Os) as organic micropollutants (OMPs). Geosmin and 2-MIB with a high concentration level i.e., spiked with a range 200 ng/L to 1,300 ng/L of initial concentration could be totally removed by MWTP when AOP, O3/GAC, AOP/GAC hybrid process was operated. It found that removal of T&Os by O3 oxidation and GAC adsorption was affected by a several factors i.e., reaction parameters such as initial concentration and type of organic compounds, water property, especially particulate matters, O3 dosage, retention time.
정수장 방류수 2차 처리를 위한 막여과 공칭공경 영향 평가
유영범 ( Young Beom Yu ),안효원 ( Hyo Won Ahn ),문경훈 ( Kyung Hoon Moon ),권순범 ( Soon Buhm Kwon ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.3
A surveillance on effluent water and a water quality standard of effluent water are being tightened. As the turbidity level is high at a water treatment plant, the efficiency of a effluent water treatment plant decreases. Therefore, it is difficult to manage water quality. In this study, the membrane filtration process for effluent water treatment was evaluated. When the UV254 of supernatant in the thickener was high, the trans-membrane pressure increased. When the coagulant was injected, the trans-membrane pressure decreased. The trans-membrane pressure decreased more when the supernatant in the thickener was treated mixing with backwash waste than when the supernatant in the thickener was treated singly. The trans-membrane pressure reached the limit in the short time at flux of 1.5 m/day. However, it was possible to operate the process for a long period at flux of 0.5 m/day. When the particles in the effluent water are smaller than the membrane pore, irreversible membrane fouling occurred. It lead to increase the trans-membrane pressure rapidly.
신훈범,이용국,유영한,안형근,한득영,Shin, Hoon-Beom,Lee, Yong-Kuk,Yu, Young-Han,Ahn, Hyung-Keun,Han, Deuk-Young 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
In this paper, the equivalent circuit model of a Rosen-type multilayer piezoelectric transformer(MPT) has been proposed based on the Mason's equivalent circuit model and the principle of single layer piezoelectric plate. From the piezoelectric direct and converse effects, the symbolic expressions between the electric inputs and outputs of the MPT have been derived from the equivalent circuit model. A simplified equivalent circuit model of the MPT whose driving part has a single input form has been proposed. The symbolic expressions of the driving part have been derived from the simplified equivalent circuit model and the model was compared with the multi-input equivalent circuit model through the simulation. In the comparisons between the simulation results and the experimental data, output voltage is 630 Vp-p in case of 11-layered MPT and 670 Vp-p for 13-layered MPT over the experiment range. As the load resistance increases, output voltage increases and saturates over $300k{\Omega}$ and the resonant frequency changes from 102 kHz to 103 kHz. The simulation and the experimental results agree well over different load resistances and frequencies.
막여과 정수처리 공정에서 화학세척을 위한 막세척 지수 평가
정혜중 ( Hay Joong Chung ),김동진 ( Dong Jin Kim ),권순범 ( Soon Buhm Kwon ),유영범 ( Young Beom Yu ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.5
Membrane filtration process in water treatment can be an efficient and economical way to separate contaminants, which suspended in water. Membrane fouling is a phenomenon to decrease water flux and increase operating pressure. It is important to normalize a membrane process by cleaning a fouling membrane as well as to predict membrane fouling. However, method of determining the cleaning characteristics of fouling membrane is insufficient. By introducing a new concept of membrane cleaning index (MCI), membrane cleaning mechanism was established by MCI through in this study. Cleaning efficiency of fouling membrane was compared and analyzed quantitatively. Cleaning index value of organic, inorganic and microbes can be indicated by membrane cleaning index. Chemical cleaning efficiency increased applying the result of membrane cleaning index to chemical cleaning. Membrane cleaning index is a useful method to indicate index of membrane cleaning properties and efficiency.