Generally speaking, the quality and concentration of sewage and sludge, as well as changes in sewage properties will affect the dosage of flocculants. Turbidity, or concentration, is directly reflected in the dosage. Sewage or sludge with low turbidity can be effective with a small amount of flocculant, while sewage with high turbidity and high concentration cannot be used with a small amount of flocculant.

  In the sand washing wastewater, 12g-20g of flocculant polyacrylamide should be added per ton of sand washing wastewater, and the dosage should be adjusted according to the sediment concentration in the muddy water. The beneficiation wastewater is generally solved by 6g polyacrylamide. In the treatment of coal washing wastewater, the dosage is the same as that in the beneficiation industry, and 6g can be added. The above data is anionic polyacrylamide with a molecular weight of 16-18 million. In sludge dewatering, urban sewage treatment plants that require cationic polyacrylamide need to add 20g-40g of cationic polyacrylamide, and the dosage can be adjusted according to the sludge concentration and the type of dewatering filter press.

 The type and amount of flocculant used for sewage treatment in each industry need to be determined by small tests. Through the flocculant test, the amount of flocculant added to each ton of sewage can be calculated.