有機色度成分によるナノろ過膜のファゥリング特性

分子量分布に基づいた評価

抄録

Batch and semi-batch systems were applied to investigate the fouling characterization of nanofiltration (NF) by colored organic matters, i. e. humic substances. A diluted kraft pulp water containing organic colored matter, with the pretreatment of ultrafiltration fractionation (UFF), was used as a synthetic raw water to examine the influence of apparent molecular weight distribution (AMWD) of colored organic matters on the fouling mechanism of NF membrane. Results show that the substances having MW10, 000-100, 000 in colored organic matters play an important role on the fouling of NF membrane. A mass of foulant was calculated by the model describing the mass of colored organic matters transference developed in this study. It is found that the amount of foulant much increases when the fractions of MW10, 000-1 00, 000 exist in colored water. The flux decline or the resistance increase was due to the increase in mass or percentage of the substances having MW10, 000-100, 000. If the substances can be appropriately removed coagulation or UF treatment system, NF fouling would be effectively controlled.