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

介绍了目前应用凝聚剂种类、性质,较了聚丙烯酰胺、聚合铁和聚合铝高分子化合物使用条件和应用范围。