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Design and Performance Evaluation of Electrodewatering System for Sewage Sludge Recycling
Jae-Keun Lee(이재근),Hee-Soo Shin(신희수),Jung-Eun Lee(이정은),Chang-Gun Lee(이창건),Joo-Yong Lee(이주용),Man-Jong Kim(김만종) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
A laboratory-scale electrodewatering system for enhancing conventional filter pressure dewatering by an electric field has been developed to decrease the water content of sludge generated in the wastewater treatment. It consists of a piston-typed filter press, a power supply and data acquisition system. The effect of electrodewatering is investigated as a function of applied pressure, applied voltage, sludge type and filtration time. Also the optimal conditions for maximizing the dewatering efficiency in the eletrodewatering system are investigated. Electric field strength and mechanical pressure are in the range of from 0 to 120 V/㎝ and from 98.1 to 392.4 ㎪. The dewatering rates increased with increasing electric strength. These experiments produced a final sludge cake with water content of 60 wt% using electrodewatering technology, compared with a 80 wt% using pressure filtration alone. The conventional filtration system using the electrodewatering shows the potential to be effective method for improving dewatering Sludge.
정수 설비를 위한 양전하가 부가된 다공성 수처리 필터 개발과 성능평가
이창건(Chang-Gun Lee),주호영(Ho-Young Joo),이재근(Jae-Keun Lee),안영철(Young-Chull Ahn),박성은(Seong-En Park) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Filtration by fibrous filter is one of the principle methods used for removing pollutant particles in the liquid. Because of the increasing need to protect both human health and valuable devices from exposure to fine particles, filtration has become more important. Filters have been developed with modified surface charge characteristics to capture and adsorb particles by electrokinetic interaction between the filter surface and particles contained in water. The main purposes of this study are to develop and evaluate the performance evaluation of the apparatus for making a positively charged porous filter media and to analyze the surface characteristics of the filter media for capturing negavitely charged contaminants mainly bacteria and virus from water. The experimental apparatus consists of a mixing tank, a vacuum pumping system, a injection nozzle, a roller press and a controller. The filter media is composed of glass fiber(50-750 ㎚), cellulose(10-20 ㎛) and colloidal charge modifier. The characteristics of filter media is analyzed by SEM(Scanning Electron Microscopy), AFM(Atomic Force Microscopy) and quantified by measuring the zeta potential values.
반복하중을 받는 철근콘크리트 보의 헌치 및 슬래브 유무에 따른 구조성능 평가
신종학(Shin Jong-Hak),하기주(Ha Gee-Joo),이재근(Lee Jae-gun),홍건호(Hong Kun-Ho),강현욱(Kang Hyun-Wook),이동근(Lee Dong-Gun) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
In this stydy, experimental research was carried out the hysteretic behavior of reinforced concrete haunched beams such as application with or without haunched and slab, and shear reinforced ratio. Test results showed that test specimens(FTG-i-1 Series, FTH-i-1 Series) was increased respectively the maximum load carrying capacity by positive 11%, negative 25% and the energy dissipation capacity by positive 1.08~1.78, negative 1.12~1.74 times in comparison with the standard specimens(FTG-0-1, FTH-0-1). And the specimens(FTG-i-1 Series, FTH-i-1 Series) showed stable hysteresis behavior.