Testing is always applied before formal using polyacrylamide in wastewater treatment. If the amount is too low, the product does not work, and if the amount is too high, there will be opposite reaction. The reason is when more than a certain concentration, polyacrylamide can not only have flocculation effect, but from the dispersion and stabilizing effect. In the choice of polyacrylamide models, following factors could be considered:
1, sludge is the inevitable product of sewage treatment. First of all we should understand the source of sludge, nature, composition and solid content. According to the sludge contains the main components of different sludge can be divided into organic sludge and inorganic sludge. In general, cationic polyacrylamide for the treatment of organic sludge, anionic polyacrylamide for the treatment of inorganic sludge, alkaline is very easy to use cationic polyacrylamide, and acidity should not use anionic polyacrylamide, when the solid content of mud is high, the amount of polyacrylamide is usually large. The use of sewage flocculants will use of cationic polyacrylamide as a sludge dewatering agent.2, polyacrylamide ion degree choice: for the dewatering sludge, can be different degrees of flocculants through a small experiment to select the best suitable polyacrylamide, so that you can get the best flocculants effect, But also to minimize the amount of drugs, cost savings. (1) the size of the floc (2) floc strength (moisture content).
The strength of the floc: the flocs should remain stable without breaking under shear. Increasing the molecular weight of polyacrylamide or selecting the appropriate molecular structure can improve the floc stability.3, polyacrylamide and sludge mixture: polyacrylamide in the dehydration equipment at a certain location and sludge must be fully reacted, the occurrence of flocculation. To this end, the viscosity of the polyacrylamide solution must be appropriate, in the existing equipment conditions can be fully mixed with the sludge, the two mixed even if it is a key factor in success. The viscosity of polyacrylamide solution is related to its molecular weight and formulation concentration.