Tannery waste water quality and quantity fluctuations, and the need for regular tests for sewage analysis to select the best type of flocculant; while biodegradability, high concentrations of suspended solids, perishable produce a large amount of pollution, waste water containing chromium and other toxic compounds need to use high-quality imported polyacrylamide. Imported polymer flocculant flocculation ability, adsorption bridge obvious, product performance and stability for this type of sewage treatment tanneries with good results. But in leather production, because of the difference, processing raw hides and different finished products, effluent quality varies widely, especially COD difference, due to a large number of leather used in the production of degreasing agents, greasing agents and surfactants active agent, sewage aeration by conventional aerobic activated sludge process, prone to a lot of foam, sludge will run away with the foam. Therefore, the conventional aeration activated sludge process when used in tannery wastewater treatment, we need to make appropriate adjustments to the process. Tanneries in the use of flocculants Note: preparation of polymer flocculant solution should be in enamel, galvanized. Aluminum or plastic bins were not in the preparation of iron is stored. Should pay attention to the flocculant evenly dissolve slowly added with stirring and heating measures, container, should be avoided knot large clumps; solution suitable for the preparation at room temperature and should avoid prolonged drastic mechanical shear, otherwise it will lead to polymer degradation, reduce the use of effects.