本文评估了直接过滤作为弗吉尼亚州五个水源水的处理方法。最有效的过滤方案包括与明矾和阳离子聚合物快速混合三分钟，并将其作为主要混凝剂。包括原水质量、水头损失、藻类浓度、混凝剂选择的影响、水力负荷、过滤介质配置和絮凝效果。包括29个参考文献、表格和图表。

This paper evaluates direct filtration as a treatment method for water from five sources in Virginia. The most effective filtration scheme consisted of a three-minute rapid mix with alum and a cationic polymer used in combination as primary coagulants. Raw water quality, head loss, algal concentrations, effects of coagulant choice, hydraulic loading, filter media configurations, and effects of flocculation are covered. Includes 29 references, tables, figures.