The results show that combined coagulated sludge by polyaluminium chloride plus polyacrylamide has better digestibility than excess sludge or primary sludge coagulated only by polyaluminium chloride.

• 建议采用聚丙烯酰胺类絮凝剂与铝类混凝剂联合处理的方法来降低铝的用量,以提高混凝污泥后续处理的效率。