聚砜超滤膜用于处理塞纳河的水——有无混凝预处理。聚合铝或三氯化铁混凝剂预处理降低了可逆污染的速率，增加了溶解有机碳（DOC）的去除，但没有降低膜不可逆污染的速率或程度。经过混凝、过滤和臭氧氧化处理的塞纳河水，即自来水，也会产生显著的不可逆污染。絮凝后的塞纳河水和自来水中的DOC大部分由低分子量的多糖物质组成。 不可逆污染可能是由于这些物质在膜表面的吸附。包括23个参考文献、表格和图表。

Polysulfone ultrafiltration membranes were used to treat water from the Seine River--with and without coagulation pretreatment. Pretreatment with polyaluminum or ferric chloride coagulant reduced the rate of reversible fouling and increased the removal of dissolved organic carbon (DOC) but did not reduce the rate or extent of irreversible fouling of the membrane. Seine River water that had been treated by coagulation, filtration, and ozonation, i.e., tap water, also produced significant irreversible fouling. Most of the DOC in flocculated Seine River water and tap water consisted of polysaccharide materials of low molecular weight. Irreversible fouling may be due to the adsorption of these materials on membrane surfaces. Includes 23 references, table, figures.