聚电解质是最常用的助凝剂或初级絮凝剂，近年来在水工业中受到越来越多的关注。它们的好处包括更强、更大和更好地沉降絮体；污泥少；以及更低的化学剂量。尽管使用聚电解质有很多优点，但目前还没有选择聚电解质的方法。本研究考察了聚合物分子量、电荷密度、聚合物用量、混合强度和絮凝颗粒之间的相互关系- 粒度分布，以帮助开发聚合物选择的科学方法。对市售聚合物进行的一系列12项实验表明，在大多数情况下，投加量与分子量无关，分子携带的电荷数与其最佳絮凝投加量之间似乎存在着强烈的相关性，通过适当选择聚合物分子量，可以在一定程度上控制絮体的大小和强度。包括25个参考文献、表格和图表。

Polyelectrolytes, most commonly used as flocculant aids or as primary flocculants, have received increased attention in the water industry in recent years. Their benefits include stronger, larger, and better-settling flocs; less sludge; and lower chemical dosages. Despite the advantages of using polyelectrolytes, no method on which to base their selection currently exists. This study examined the interrelationships between polymer molecular weight, charge density, polymer dosage, mixing intensity, and the flocculated particle-size distribution in an effort to aid in the development of a scientific method of polymer selection. A series of twelve experiments with commercially available polymers showed that in most cases dosage was independent of molecular weight, that a strong correlation appears to exist between the number of charges a molecule carries and its optimum flocculation dosage, and that the size and strength of a floc may be controlled to some extent by proper selection of polymer molecular weight. Includes 25 references, tables, figures.