Selection of Anionic Polyacrylamide Models in Water Treatment

The selection of anionic polyacrylamide flocculants can only be determined according to the test. In the test, first determine the approximate dosage, observe the flocculation and sedimentation speed, calculate the treatment cost, and select an economical and applicable flocculation agent. Anionic polyacrylamide flocculants generally include inorganic flocculants and organic flocculants. How to choose a flocculant in wastewater treatment should be selected according to the characteristics of the wastewater in a specific industry, and at the same time, it also depends on where the flocculant is added and what it is used for.

1. Selection of anionic polyacrylamide models

Generally, when choosing an inorganic anionic polyacrylamide flocculant, the composition and pH of the wastewater should be considered, and then the most suitable one should be selected. When choosing an organic flocculant, it is mainly to see whether anionic polyacrylamide, cationic polyacrylamide or non-ionic polyacrylamide should be used. Anionic polyacrylamide is generally divided into weak yin, medium yin and strong yin according to the degree of hydrolysis. The selection of cations is generally used in sludge dewatering, and the selection of cationic polyacrylamide is very important. Urban sewage treatment plants generally use medium and strong cationic polyacrylamide, and papermaking, printing and dyeing factories generally use weak cations for sludge dewatering, and pharmaceutical wastewater is generally used. Choose strong cations and so on. Each type of wastewater has its own unique characteristics. Non-ionic polyacrylamide is mainly used under weakly acidic conditions, and printing and dyeing plants use non-ionic PAM more.

2. Selection of molecular weight of anionic polyacrylamide

After the appropriate type of anionic polyacrylamide ion is determined through experiments, the flocculant product with the appropriate molecular weight is selected, not the higher the molecular weight, the better the treatment effect. We will determine the appropriate type of anionic polyion for customers through testing, and then add flocculant products with different molecular weights to test better treatment effects and lower use costs.

Anionic polyacrylamide is the best choice for wastewater treatment. Due to the difference in the source, nature, composition and solid content of sewage, the selection of the correct polyacrylamide product model when dealing with different sewage plays a decisive role in the success of wastewater treatment.

(1) First of all, in general, cationic polyacrylamide is used to treat organic sludge, and anionic polyacrylamide is used to treat inorganic sludge. Cationic polyacrylamide should not be used when the alkalinity is strong, and anionic polyacrylamide should not be used when the acidity is strong. Polyacrylamide, when the solid content of the sludge is high, the amount of polyacrylamide is usually larger.

(2) Secondly, according to the sewage to be treated, flocculants with different ion concentrations can be used to screen through small experiments to select the best suitable polyacrylamide, so that the best flocculant effect can be obtained, and the dosage of dosing can be improved. Minimum, cost saving.

(3) Finally, the flocculant polyacrylamide must fully react with the wastewater when treating wastewater to cause flocculation. To this end, the viscosity of the polyacrylamide solution must be appropriate, and it can be fully mixed with the sludge under the existing equipment conditions. Whether the two are mixed evenly is the key factor for success.