The role of polyacrylamide in seawater desalination

Although 70% of the earth is water, not much can be used or drunk directly. Our cities have water shortages to varying degrees. Seawater desalination is one of the best ways to solve this problem. Desalination is the conversion of seawater with high salinity into water that can be used for industrial use or drinking.

The current desalination methods are distillation and reverse osmosis. The distillation process is generally used in large desalination plants and in places where there is sufficient heat. Reverse osmosis is widely used because of its high desalting rate and wide adaptability. Reverse osmosis desalination of seawater must first pretreat the seawater, and then carry out sterilization and algae removal, flocculation and impurity removal, reverse osmosis, odor removal and other treatments.

Because there is a lot of sediment in the sea water, and there are a lot of algae and some colloids, 

Sodium Alginate, the turbidity is very high. To remove a large number of impurities, the method of flocculation sedimentation is generally adopted. Polyacrylamide is the best flocculant. Because polyacrylamide has a long molecular chain, the molecular chain has a hydroxyl group and an electric charge, it can adsorb suspended matter in water,  form a bridge, so that the dispersed suspended matter forms a larger floc and precipitates to the bottom. For the purpose of removing impurities, polyacrylamide is the most ideal flocculant for Water Treatment Chemicals, which is convenient to use, high impurity removal rate and low cost.