尽管超滤具有令人印象深刻的浊度去除能力，但其无法去除大量天然有机物（NOM）似乎是一个障碍，尤其是在超滤（UF）膜系统的特性非常吸引人的情况下。对混凝-絮凝和粉末活性炭（PAC）吸附的各种组合组成的预处理工艺进行了评估，以用于湖水的超滤。渗透质量的判断基于不可穿透有机碳（NPOC）、紫外线吸收化合物、浊度和三卤甲烷（THM）前体的去除。 利用串联电阻模型对渗透通量的发展和反洗后的通量恢复进行了监测和建模。结果表明，超滤要有效去除NPOC和THM前体，需要PAC预处理。超滤前的混凝处理也比单独超滤去除更多有机物，但在调节滤饼和提高通量方面似乎更重要。包括14个参考文献、表格和图表。

Although ultrafiltration has impressive capabilities for turbidity removal, its inability to remove significant amounts of natural organic matter (NOM) would seem to be a handicap, particularly in cases in which characteristics of ultrafiltration (UF) membrane systems are very attractive. Pretreatment processes consisting of various combinations of coagulation-flocculation and powdered activated carbon (PAC) adsorption were evaluated for use in UF of a lake water. Permeate quality was judged on the basis of the removal of nonpurgeable organic carbon (NPOC), ultraviolet-light-absorbing compounds, turbidity, and trihalomethane (THM) precursors. The development of permeate flux and the flux recovery after backwash were also monitored and modeled with the series resistance model. It was shown that for ultrafiltration to be effective in removing NPOC and THM precursors, pretreatment with PAC is required. Coagulation treatment before UF also results in the removal of more organic matter than by UF alone but appears to be more important in conditioning the filter cake and enhancing flux. Includes 14 references, tables, figures.