The selection of anionic and cationic polyacrylamide for sewage treatment should be determined based on on-site flocculation tests. Whether it is anionic, cationic or non-ionic, tests are required to select a specific model. Depending on the chargeability of the target substances to be treated, generally speaking, cationic polyacrylamide is mostly used for sludge dehydration. However, this depends on the quality of local sewage. Sometimes amphoteric polyacrylamide and nonionic polypropylene may also be used. Amide. For sedimentation, anionic polyacrylamide is mostly used. Depending on the objects being treated and the nature of the sewage, nonionic polyacrylamide and zwitterionic polyacrylamide are also used.
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