액상 비료를 유도 용액으로 사용하는 정삼투 기반의 해수 담수화
Forward Osmosis Based Seawater Desalination using Liquid Fertilizer as Draw Solution
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The present study explored the way to desalinate seawater for agricultural irrigation using forward osmosis (FO) process usingliquid fertilizer as draw solution. FO experiments were performed in a cross flow mode using flat sheet FO membrane. The effectof membrane orientation, flow rate, and draw solution concentration on the performance of forward osmosis was investigated bymeasuring water flux of forward osmosis membrane. The water flux when the draw solution was placed against the membrane activelayer was lower than the water flux when the feed solution was placed against the membrane active layer. This results indicated thatthe decrease of effective osmotic pressure by dilutive internal concentration polarization was less than that by concentrative internalconcentration polarization. Increasing flow rate from 66.7 to 133.1 cm3/min resulted in increase of the water flux when the membraneactive layer orient to draw solution and feed solution, respectively. The reduction of resistance to water flow increased water flux athigher flow rate. The water flux of FO membrane increased with increasing draw solution concentration from 10000 to 30000 mg/L. The water flux for KH2PO4 draw solution was similar to that for commercial fertilizer. Optimization of FO process would contributeto economically desalinate brackish water for agricultural use.
Abstract
The present study explored the way to desalinate seawater for agricultural irrigation using forward osmosis (FO) process usingliquid fertilizer as draw solution. FO experiments were performed in a cross flow mode using flat sheet FO membrane. The effectof membrane orientation, flow rate, and draw solution concentration on the performance of forward osmosis was investigated bymeasuring water flux of forward osmosis membrane. The water flux when the draw solution was placed against the membrane activelayer was lower than the water flux when the feed solution was placed against the membrane active layer. This results indicated thatthe decrease of effective osmotic pressure by dilutive internal concentration polarization was less than that by concentrative internalconcentration polarization. Increasing flow rate from 66.7 to 133.1 cm3/min resulted in increase of the water flux when the membraneactive layer orient to draw solution and feed solution, respectively. The reduction of resistance to water flow increased water flux athigher flow rate. The water flux of FO membrane increased with increasing draw solution concentration from 10000 to 30000 mg/L. The water flux for KH2PO4 draw solution was similar to that for commercial fertilizer. Optimization of FO process would contributeto economically desalinate brackish water for agricultural use.
참고문헌 (21)
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