研究了硫酸亚铁作为三氯化铁的替代混凝剂。对混凝剂的铁含量、重金属污染物、酸度、氯需求量和可沉降固体进行了评估。Jar试验和分装试验表明，两种混凝剂的性能相似，成本相当。在整个研究过程中，一个明显的异常现象是，一磅硫酸亚铁形式的铁比作为三氯化铁的铁有效20%。开发了一个方程式，用于在成本和性能的基础上比较氯化铁和硫酸亚铁，以便后续投标。由于投标竞争加剧，在三年内，混凝剂的成本降低了50%。包括8个参考文献、表格、图表。

Ferrous sulfate was studied as an alternative coagulant to ferric chloride. Coagulants were evaluated for iron content, heavy metal contaminants, acidity, chlorine demand, and settleable solids. Jar tests and split-plant trials demonstrated similar performance at comparable costs with either coagulant. An anomaly that was evident throughout the study was that a pound of iron in the form of ferrous sulfate was 20 percent more effective than iron as ferric chloride. An equation was developed to compare ferric chloride and ferrous sulfate on a cost and performance basis for subsequent bids. As a result of the increased competition in bidding, there was a 50 percent decrease in the cost of coagulant over a three-year period. Includes 8 references, tables, figures.