混凝剂辅助直接过滤是处理陆地有色地表水的常见工艺。本研究考察了用阳离子聚电解质部分取代明矾是否可以改善该工艺。进行了实验室实验，以确定明矾和聚合物是否存在唯一的最佳剂量组合，在给定的颜色浓度和pH值下，该组合可最大限度地提高模型过滤器的性能。根据可过滤性数和滤液铝浓度评估过滤器性能。结果表明，随着明矾用量的减少，过滤器的系统性能较差。在最佳用量下，用聚合物部分替代明矾对凝固颜色的效果似乎不如单独使用明矾。包括28个参考文献、表格和图表。

Coagulant-assisted direct filtration is a common process for treating upland, colored surface waters. This study investigated whether the process could be improved by partially replacing alum with cationic polyelectrolyte. Laboratory experiments were carried out to determine whether there is a unique optimal dosage combination of alum and polymer that--at a given color concentration and pH--maximizes the performance of a model filter. Filter performance was assessed in terms of the Ives filterability number and filtrate aluminum concentration. The results indicate that the filter performs systematically less well as the alum dosage is reduced. Partial replacement of alum with polymer appears to be less effective for coagulating color than alum alone at its optimal dosage. Includes 28 references, table, figures.