How To Choose Suitable Type of Cationic Polyacrylamide?
The selection of cationic polyacrylamide generally depends on the different sludge to be treated and needs to be selected through experiments. In the experiment, solutions of polyacrylamide with different ionic degrees were prepared, mixed with sludge under the same conditions, and the size of the flocs and the moisture content of the flocs were observed.
1. The size of the flocculation: If the sludge flocculation is too small, it will affect the drainage speed. If the sludge flocculation is too large, the sludge flocculation will bind more water and reduce the mud biscuitness. At this time, it is necessary to The size of the flocs can be adjusted by selecting the molecular weight of the cationic polyacrylamide.
2. Strength of flocculation: sludge flocculation should remain stable without breaking under shearing action. Only by selecting the appropriate molecular weight and ionicity of cationic polyacrylamide can the flocs be more stable.
3. Dissolution of cationic polyacrylamide: Only when polyacrylamide is fully dissolved can the flocculation effect of polyacrylamide be better and the amount of polyacrylamide used be reduced. The dissolution rate is related to the molecular weight of polyacrylamide and the concentration of the solution. Production When choosing the appropriate concentration, generally 0.05%-0.2%.
4. Mixing of cationic polyacrylamide and sludge: Polyacrylamide needs to be fully mixed with sludge to achieve the ideal flocculation reaction. A suitable polyacrylamide solution viscosity is required. The sludge remains unchanged under the same equipment conditions. It can be fully mixed with polyacrylamide. Be careful not to over-stir when mixing, because over-stirring will destroy the molecular weight of polyacrylamide, which will cause the flocs to flocculate and then disperse. The flocs are wrapped in polyacrylamide and repel each other. It is relatively small and the teaching is loose.