Most of the alum produced today is used in the pulp & paper industry as well as water and wastewater treatment. It is inexpensive and effective for a broad range of treatment problems because it can function as a coagulant, flocculants, precipitant and emulsion breaker. As a coagulant and flocculants, alum removes turbidity, suspended solids and colloidal color, reduces biochemical oxygen demand (BOD) and clarifies potable, process and wastewater.
The main uses of alum are:
· Water treatment: used as a coagulant to remove suspended solids and or some metals (e.g. Cr, Ba, Cu) from water (either drinking water or in waste treatment facilities)
· Paper sizing: used as a rosin sizing control in paper production, affects the drainage of liquor from the paper
Other Major Uses
In addition to the primary uses in the pulp & papermaking industry and for water and wastewater treatment, alum is also used in: