| 摘要 |
<p>Separation of solids from an aqueous suspension by sedimentation is improved by mixing a cationic polymeric flocculant into the suspension, aggregating the flocculated material by mixing an anionic colloidal material into the flocculated suspension, and then separating the aggregated material by sedimentation. The suspension is preferably a sewage suspension and the process is preferably a primary sedimentation stage. The cationic polymeric flocculant is preferably a low molecular weight coagulant polymer, especially a diallyl dimethyl ammonium chloride polymer. A high molecular weight, generally anionic, flocculant can be added after the anionic colloidal material and before the sedimentation.</p> |
