Selecting Coagulant, Filtration, and Sludge‐Conditioning Aids

An investigation of methods for the evaluation of polymer performance in coagulation, sedimentation, filtration, and sludge conditioning involved a literature review as well as laboratory and in‐plant comparisons of a number of candidate methods and associated variables. Results are given for the comparison of numerous jar‐test variations, small‐scale filtration methods, dewaterability tests, and other techniques. A procedures manual was developed during this study for use in the selection of optimal polymers and doses for water treatment applications.∗