정삼투 공정에 의한 수크로오스 용액의 투과거동 (Permeation Behavior of Sucrose Solutions by Forward Osmosis Process)

서지정보

· 발행기관 : 한국수처리학회
· 수록지 정보 : 한국수처리학회지 / 21권 / 6호 / 57 ~ 69페이지
· 저자명 : 이근우, 한명진, 남석태

초록

This study examined the effect of concentration polarization on permeation behavior in forward osmosis membrane process. The membranes used for experiments are commercialized cellulosic membrane(HTI-CAT, Albany, OR). The reduction in permeate flux during a forward osmosis(FO) membrane process is largely due to the formation of concentration polarization on membrane surfaces. The internal concentration polarization within the porous support layer plays more significant role on that reduction compared to the external concentration polarization on the active membrane surface. Water permeate flux through the FO membrane increased nonlinearly with the increase in osmotic pressure. When the draw solution was directed on the membrane active layer(DS-AL), the permeate flux was 1.33-1.90 times higher than that for the draw solution on the support layer(DS-SL). The corresponding variation in the flux would be expressed as J=-0.0177+0.4506π-0.0032π2 for the forward and J=0.0948+0.3292π-0.0037π2 for the latter. The water permeability coefficient was 1.7758x10-7 m/s atm for DS-AL and 1.4481x10-7 m/s atm for DS-SL mode. The corresponding membrane resistance was 5.6312x106 s atm/m for DS-AL and 6.9058x106 s atm/m for DS-SL mode respectively. Mass transfer coefficient was calculated as 0.11x10-6~5.18x10-6 m/s for DS-AL and 0.08x10-6~1.49x10-6 m/s for DS-SL, and the ratio of DS-AL to DS-SL was 1.38~3.48.

영어초록

This study examined the effect of concentration polarization on permeation behavior in forward osmosis membrane process. The membranes used for experiments are commercialized cellulosic membrane(HTI-CAT, Albany, OR). The reduction in permeate flux during a forward osmosis(FO) membrane process is largely due to the formation of concentration polarization on membrane surfaces. The internal concentration polarization within the porous support layer plays more significant role on that reduction compared to the external concentration polarization on the active membrane surface. Water permeate flux through the FO membrane increased nonlinearly with the increase in osmotic pressure. When the draw solution was directed on the membrane active layer(DS-AL), the permeate flux was 1.33-1.90 times higher than that for the draw solution on the support layer(DS-SL). The corresponding variation in the flux would be expressed as J=-0.0177+0.4506π-0.0032π2 for the forward and J=0.0948+0.3292π-0.0037π2 for the latter. The water permeability coefficient was 1.7758x10-7 m/s atm for DS-AL and 1.4481x10-7 m/s atm for DS-SL mode. The corresponding membrane resistance was 5.6312x106 s atm/m for DS-AL and 6.9058x106 s atm/m for DS-SL mode respectively. Mass transfer coefficient was calculated as 0.11x10-6~5.18x10-6 m/s for DS-AL and 0.08x10-6~1.49x10-6 m/s for DS-SL, and the ratio of DS-AL to DS-SL was 1.38~3.48.

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