Analysis of membrane foulants in water treatment process (III) - Effect of prechlorination on membrane fouling prevention

摘要

A constant rate filtration experiment was done using hollow fiber microfiltration membranes to study membrane fouling suppression effects by prechlorination. The raw water was drawn from Lake Kitaura. The average increase rate in Trans-Membrane Pressure of the prechlorinated process was less than 10% of that without prechlorination. A significant effect of prechlorination on membrane fouling prevention was verified, which indicated that bio-fouling also occurred in the membrane filtration processes for potable water treatment. Evaluation on fouling organics by Pyrolysis-GC-MS identified pyrolysis fragments such as hydroxypropanone, acetonitrile, acetamide, benzene, and phenol. Research results suggested that the fouling organics found in this research included, polysaccharides, proteins amino sugars, and aromatic compounds which constitute humic substances.