本研究旨在评估明矾污泥用于土地的长期环境影响。在原始现场进行的调查包括土壤分析、土壤水分监测、地下水监测和松针组织分析。没有观察到长期（30个月）影响，作者得出结论，明矾混凝剂污泥可以以至少1.5%至2.5%（按干重计）的装载率应用于林地，而不会产生不良影响。包括19个参考文献、表格和图表。

The purpose of this study was to evaluate the long-term environmental effects of applying alum sludge to land. Investigations at the original field site included soil analysis, soil water monitoring, groundwater monitoring, and analysis of tissues from pine needles. No long-term (30 months) effects were observed, and the authors conclude that alum coagulant sludges can be applied to forest lands at loading rates of at least 1.5 to 2.5 percent by dry weight without adverse effect. Includes 19 references, tables, figures.