温州ミカン果汁の逆浸透濃縮における膜面付着物質について

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タイトル別名
  • Fouling materials on the reverse osmosis membranes during concentration of mandarin orange juice.
  • 温州ミカン果汁の逆浸透濃縮における膜面付着物質について〔英文〕
  • ウンシュウ ミカン カジュウ ノ ギャクシントウ ノウシュク ニ オケル マク

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The components of fouling materials of mandarin orange juice on the membrane during Reverse Osmosis (RO) concentration were analyzed by washing the deposit from the membrane. Fouling components were mainly pectin, and insoluble materials similar to cellulose. The relatively low molecular weight components, sugars and amino acids, were in lower concentrations in the deposit than in the feed solution. A model solution consisting of the major components of the deposit, pectin and cellulose, was used for examination of the increasing rate of the resistance to water permeability by the deposit. There was no declining flux in the suspension of cellulose. However, a large decline of flux was demonstrated with the solution of pectin. This decline depended on the permeability of the membrane and the operating conditions. A little decline in rate resulted after insolubilization of pectin with calcium chloride. Therefore, it was demonstrated that pectin is a dominant component for resistance, and the increasing rate of resistance to the permeability of water by deposits was governed by the flow velocity in the range of flow rates used in this study. Fractionation by molecular weight of the components of pectin deposited on the membrane was carried out by a gel-filtration technique with a Sepharose 4B column. Pectin has a broad molecular weight range and high molecular weight pectins deposited on the membrane during RO treatment was found to be very large. This phenomenon shows that the higher molecular weight substances have lower diffusibility and lower molecular weight substances have higher diffusibility.

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