Ayoub Mohamed, Abdelfattah Abdallah
Public Works Engineering Department, Faculty of Engineering, Tanta University, Tanta 31511, Egypt E-mail:
Water Sci Technol. 2016;74(2):516-23. doi: 10.2166/wst.2016.241.
Alum recovery from water treatment sludge is a promising technique applied to decrease usage of fresh coagulants in the water treatment industry. In addition, alum recovery reduces sludge volume for easy handling. The undertaken work investigated the parametric conditions for alum recovery procedure by acidification. The results show that alum recovery reaches up to 69.03%, and the reduction of sludge volume reaches its highest level at 90%. Moreover, results of the parametric investigation reveal that the mixing time of 60 minutes and mixing intensity of 150 rpm are the optimum conditions of mixing for alum recovery from water treatment sludge. The optimum pH level is 1.50 for alum recovery as indicated by maximum aluminum releasing, maximum reduction of sludge volume, and reasonable dosages of added sulfuric acid.
从水处理污泥中回收明矾是一种很有前景的技术，可用于减少水处理行业中新鲜混凝剂的使用量。此外，回收明矾可减少污泥体积，便于处理。所开展的工作研究了通过酸化回收明矾过程的参数条件。结果表明，明矾回收率高达69.03%，污泥体积减少率最高可达90%。此外，参数研究结果表明，60分钟的混合时间和150转/分钟的混合强度是从水处理污泥中回收明矾的最佳混合条件。从最大铝释放量、最大污泥体积减少率和合理的硫酸添加量来看，明矾回收的最佳pH值为1.50。
