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하수에서 응집제 주입률 자동제어 시스템(CAST)을 이용한 MF 분리막의 막 오염에 관한 응집 전처리 효과에 관한 연구
김원경 ( Wonkyong Kim ),성윤경 ( Yunkyong Sung ),유흥성 ( Hungsung Yoo ),박용진 ( Yongjin Park ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.4
A combined system of coagulation and membrane processes was investigated in this study for coagulation pretreatment on the fouling of microfiltration membrane in treating municipal wastewater. Coagulant dosing is traditionally based on jar-tests or operator experience, resulting in either overdosing or insufficient dosing. For reliable purity and accuracy, on-line coagulant control instrumentation is necessary. In this study, we assess the feasibility of a new coagulant dose control instrument, the online charge-based automatic titration system, charge analyzing system with titrator (CAST), to control membrane fouling in microfiltration (MF) process. This paper presents a 100 m3/d pilot for effect of coagulation pretreatment and organic matters (UV254, PO4-P) removal using a coagulation/MF process. To confirm the coagulation effect, the CAST unit was also compared with a control method where coagulants were applied at a constant rate using In-Line Mixer device. For the extension of filtration time required to reach TMP in MF process, the application of CAST unit by applying a CAST Factor can be more useful and effective for reducing CIP cycle time, and energy, water, and chemical consumption than a control unit due to the rapid and accuracy calculation of coagulant dosage.
홍재성(Hong Jaisung),김연수(Kim Younsu),이호용(Lee Hoyong),김원경(Kim Wonkyong),양우봉(Yang woobong),신진호(Shin Jinho) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
There are many EMU lines in korea. But only one type has been applied to passenger side door. This type is so called "Pocket sliding type". This type has some week points. To begin with, it is not good for decreasing the noisy form the outside of carbody. And the second time, if some obstacles are put between sliding door, only driver can operate re-open door switch manually in driver"s cab. This type is so dangerous for passengers. So many people want to the new door type that have no defect. KRRI joined forces with ANT corporation for pneumatic plug door system. This type will be good for decreasing the noisy, passenger"s safe. The project was started at the last year on November and will be finished on June, this year In this paper, we will deal with the role of cylinder, planetary gear, door control unit, dynamic mechanism, and the report of FEM, type test. This paper will contribute to the electric motor control plug door system.
홍재성(Hong Jaisung),이호용(Lee Hoyong),김원경(Kim Wonkyong),최성규(Choi Sungkyou) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
The standardization urban transit project has been started by government and the Korean standard electrical railcar has been designed. The bodyshell of standard railcar is made of aluminium alloy. In the present paper, the design of its bodyshell is evaluated in the viewpoint of strength analysis. The loading condition is based on the "Test Methods of Static Load for Body Structure of Electrical Multiple Unit", standard specification. The bodyshell of Korean standard EMU consist of longitudinal extrusion members which are double-skin structure type. For the purpose of security and lightening we decided the section of the aluminium carbody through the size optimization in this paper. Hereafter this paper will contribute to the shape optimization.