Ionic degree selection of polyacrylamide

For the sludge to be dewatered, flocculants with different ionic degrees can be screened through small experiments to select the most suitable polyacrylamide. This can not only achieve the best flocculant effect, but also minimize the amount of dosing and save costs. . The key to choosing ion degree is:

(1) Size of flocculation

Size of flocculation: Too small flocculation will affect the speed of drainage. Too large flocculation will bind more water and reduce the degree of mud biscuit. The size of the flocs can be adjusted by selecting the molecular weight of the polyacrylamide.

(2) Floc strength (moisture content)

Strength of floc: The floc should remain stable without breaking under shear. Increasing the molecular weight of polyacrylamide or selecting an appropriate molecular structure can help improve flocculation stability.

(3) Mixing of polyacrylamide and sludge

Polyacrylamide must fully react with sludge at a certain location in the dehydration equipment to cause flocculation. To this end, the viscosity of the polyacrylamide solution must be appropriate, and it must be fully mixed with the sludge under the existing equipment conditions. Whether the two are mixed uniformly is a key factor for success. The viscosity of polyacrylamide solution is related to its molecular weight and preparation concentration.

(4) Dissolution of polyacrylamide

Only with good dissolution can the flocculation effect be fully exerted. As mentioned before, the dissolution process of polyacrylamide is actually the maturation process of polyacrylamide. Sometimes it is necessary to speed up the dissolution rate. In this case, you can consider increasing the concentration of the polyacrylamide solution.

Therefore, the best product selection must be determined by laboratory beaker experiments.

It can be seen from the above that the selection of molecular weight and ionicity is not absolute. It is best to do a selection test before choosing polyacrylamide, and it is best to run a machine operation test. Only in this way can the data obtained be the most accurate, and the optimal polyacrylamide will be cost-effective and higher.