How to choose the molecular weight of polyacrylamide?

October 22 11:31 2020

Molecular weight is an important index of polyacrylamide products, it will affect the effect of polyacrylamide, but the higher the molecular weight, the more expensive the price, the better the effect? not always. How to choose the right molecular weight polyacrylamide products?

First of all, determine the molecular weight of the following three types of ionic polyacrylamide.

Flocculation effect of polyacrylamide

1. The molecular weight is 4-18-25 million anionic polyacrylamide;
2. Nonionic polyacrylamide with molecular weight between 6 million and 12 million;
3. Cationic polyacrylamide with molecular weight between 7 million and 12 million.

Before selecting the molecular weight, it must be ensured that anionic, nonionic or cationic polyacrylamide can be used. Generally speaking, it can only be judged according to the pH value of sewage. Sewage is acidic, most of which use cationic products, while sewage is alkaline. In general, most of them use anionic products; nonionic polyacrylamide has no ionic functional groups. Under acidic conditions, the flocculation is less affected by the fluctuation of pH and salt, and its flocculation strength and flocculation performance are better than that of anionic polyacrylamide.

1. Generally speaking, polyacrylamide for industrial wastewater treatment generally uses products with molecular weight between 6 million and 18 million;
2. If it is used for thickening, such as in the manufacturing industry, such as incense, glue and paint, it is recommended to choose products with molecular weight of 18 million to 25 million;
3. Polyacrylamide for coal washing wastewater treatment and polyacrylamide for sand washing wastewater treatment are generally products with molecular weight between 12 million and 16 million;
4. Cationic products with molecular weight of 9-12 million are usually used for municipal sewage treatment.
5. Products with molecular weight of 4-12 million are usually used for wastewater treatment in iron and steel plants.
6. Polyacrylamide used for sludge dewatering is usually a product with molecular weight of 7-12 million.

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