当单独使用混凝剂时，以及当混凝剂与助凝剂一起用于包含沉淀的常规处理时，优化一次混凝剂剂量需要考虑不同的因素。仅基于固定水质的优化并不完全令人满意。如果一回路单独使用，优化应基于与化学成本和沉淀池成本相关的经济分析。如果一次混凝剂与助凝剂一起使用，优化应基于尽量减少下游过滤器表面的堵塞。包括10个参考文献、表格和图表。

Different considerations are necessary for optimizing primary coagulant dosage when the coagulant is used alone and when it is used in conjunction with flocculant aids for conventional treatment incorporating sedimentation. Optimization based solely on settled water quality is not wholly satisfactory. If the primary is applied alone, optimization should be based on an economic analysis relating chemical costs an sedimentation basin costs. If the primary coagulant is used with flocculant aids, optimization should be based on minimizing the clogging of downstream filter surfaces. Includes 10 references, tables, figures.