The difference between polyaluminum chloride and polyferric sulfate

Both polyaluminum chloride and polyferric sulfate are inorganic coagulants and are widely used in the field of water treatment.

Appearance difference: the color of polyaluminum chloride is from yellowish brown to white, and the shape is granular and powdery; polyferric sulfate is light yellow powdery.

Content difference: solid polyaluminum chloride is classified by 20%-30% of various products, and solid polyferric sulfate is only 20%-21%.

Differences in treatment effect: Although they can all remove pollutants in water, their removal effects on different types of pollutants are not the same. For example, polyaluminum chloride has a good removal effect on ammonia nitrogen and nitrite in water, but the removal effect on heavy metal ions in water is relatively poor. Polyferric sulfate has better removal effect on suspended matter and heavy metal ions in water, but relatively weaker removal effect on dissolved ions and organic matter in water.

The change of water temperature during polyaluminum chloride treatment has a great influence on the change of water temperature. When the temperature is low, the flocculation effect slows down, the alum flowers become smaller, and the precipitation effect is poor. The application effect of polyferric sulfate in low temperature turbidity removal is very good, and the suspended solids are completely removed. Polyferric sulfate can not only deal with general heavy metal ions, but also has a good removal effect on COD, BOD and water chroma. The removal rate of BOD can reach more than 93%, and the removal effect of other impurities and turbidity is obviously better than polyaluminum chloride.