台架、中试和全尺寸试验表明，明矾生产过程中添加磷酸盐 混凝可降低过滤水中的可溶性（溶解）铝（Al）浓度。在期间 初步试验，以PO4、正磷酸盐的形式，剂量约为0.5毫克/升（mg/L） 铝残留量减少25%，混合磷酸盐（60%聚磷酸盐，40%聚磷酸盐 与对照组相比，邻苯二甲酸减少了31%的铝，聚磷酸盐减少了17%的铝 不添加磷酸盐。虽然所有三种形式的磷酸盐都减少了铝残留，但视觉上 在中试期间进行的观察表明，絮体颗粒较小，不会随着温度的升高而沉降 当加入混合磷酸盐或聚磷酸盐时。 中试工厂过滤后的浊度读数 水证实，聚磷酸盐和混合磷酸盐的添加量略微增加 水的浊度水平。由于混合和混合后观察到较小的絮体颗粒 只添加正磷酸盐的聚磷酸盐进行了全面研究。全面跟进 试验证实，添加正磷酸盐可以减少铝残留，而不会影响 成品水浊度水平。包括参考资料、表格、图表。

Bench, pilot and full-scale testing showed that the addition of phosphate during alum coagulation reduces soluble (dissolved) aluminum (Al) concentrations in filtered water. During pilot testing, a dose of approximately 0.5 milligrams per liter (mg/L) as PO4, orthophosphate decreased aluminum residuals by 25 percent, a blended phosphate (60 percent poly, 40 percent ortho) decreased Al by 31 percent, and polyphosphate decreased Al by 17 percent compared to no phosphate addition. While all three forms of phosphate decreased aluminum residuals, visual observations made during pilot testing showed that floc particles were smaller and didn't settle as well when the blended or polyphosphate was added. Turbidity readings on pilot plant filtered water confirmed that polyphosphate and blended phosphate addition slightly increased filtered water turbidity levels. Due to the smaller floc particles observed with blended and polyphosphate, only orthophosphate addition was investigated full-scale. Follow-up full-scale testing confirmed that orthophosphate addition decreased aluminum residuals without affecting finished water turbidity levels. Includes reference, tables, figures.