The author outlines the type, characteristics of coagulant popularly used; especialy discusses the application conditions and extents of polyacrylamide, polyiron sulfate and poly alum.

介绍了目前应用的凝聚剂的种类、性质,的论述了聚丙烯酰胺、聚合铁和聚合铝分子化合物的使用条件和应用范围。