연구논문 : 담수화를 위한 정삼투 공정에 있어 NaCl용액의 투과유속 감소특성
분야
공학 > 환경공학
저자
이근우 ( Keun Woo Lee ) , 한명진 ( Myeong Jin Han ) , 남석태 ( Suk Tae Nam )
발행기관
한국수처리학회(구 한국수처리기술연구회)
간행물정보
한국수처리학회지 2013년, 제21권 제4호, 13~25페이지(총13페이지)
파일형식
63201119.pdf [무료 PDF 뷰어 다운로드]
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    영문초록
    This study examined the effect of concentration polarization on permeate flux in forward osmosis membrane process for saline water. The forward osmosis membranes used for experiments are commercialized cellulosic membrane(HTI-CAT, Albany, OR). There is a deviation in the permeate flux with the increasing salt concentration. This nonlinearity of permeate flux was due to the reduction in effective osmotic pressure caused by dilutive concentration polarization(DCP) phenomena. The concentration polarization(CP) formation and the corresponding variation in permeate flux behavior varied greatly depending on membrane orientation as well as draw solution concentration and cross-flow velocity. The CP increased with increasing the draw solution`s concentration and showed nonlinear profiles regardless of concentration. And the nonlinearlity is more pronounced in the mode of draw solution facing support layer(DS-SL) than in the mode of draw solution facing active layer(DS-AL). The behavior of the former is called internal concentration polarization(ICP) and mainly caused by the porous internal structure of an asymmetric membrane. The water permeability coefficient was 1.8081x10-7 for DS-AL and 1.0957x10-7 m/s atm for DS-SL mode. The corresponding membrane resistance was 5.5306x106 and 9.1266x106 s atm/m, respectively. The fraction of CP resistance in the total permeation resistance was 0.28~0.72 for DS-AL mode and 0.33~0.86 for DS-SL mode. The formation and dissipation of CP in the draw solution due to the permeate water reveals different oscillating behavior according to the membrane orientation.
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