LT: Selective Alum Recovery and Simultaneous Solid Wastes Reduction in Large Water Treatment Plants

本研究的目的是了解通过复合离子交换（CIX）材料选择性回收Al（III）的机制，同时拒绝溶解的有机物、锰、重金属、砷和其他物质。进一步，利用对这些机理的理解来优化CIX的性能，以增强水处理污泥中明矾的分离和回收。明矾或硫酸铝是美国饮用水处理中使用最广泛的混凝剂，是每天处理的200万吨水处理污泥固体的主要成分（25-50%）。这种材料的成功回收和再利用不仅会减少对这种资源的需求，而且更重要的是会减少要处理的污泥数量，而成本和环境审查则会增加。最近的研究表明，使用一种新型的CIX从复杂的污泥或泥浆背景中选择性地回收金属沉淀物的前景。CIX的薄片状形态使其与污泥介质兼容，而官能团提供高铝选择性。这项资助是根据美国国家科学基金会/朗讯科技公司1998年工业生态研究奖学金计划提供的。

9814265 Sengupta The objective of this research is to understand the mechanisms which allow selective Al(III) recovery by composite ion exchange (CIX) materials while rejecting dissolved organic matter, manganese, heavy metals, arsenic and others. Further, to utilize the understanding of these mechanisms to optimize the CIX properties for enhanced separation and recovery of alum from water treatment sludges. Alum, or aluminum sulfate, is the most widely used coagulant in treatment of drinking water in the U.S. and is a major component (25-50%) of the two million tons of water treatment sludge solids disposed of daily. The successful recovery and reuse of this material would not only reduce the demand for this resource, but more significantly would reduce the quantity of sludges to be disposed of while costs and environmental scrutiny increase. Recent studies have demonstrated the prospect of selectively recovering metal precipitates from the complex background of sludge or slurry using a new type of CIX. The thin-sheet morphology of the CIX makes it compatible with the sludge medium while the functional groups offer high aluminum selectivity. This grant is made pursuant to the joint NSF/Lucent Technologies Industrial Ecology Research Fellowships Program 1998.