Paper & Packaging Products

Introduction

ALUM (aluminum sulfate) is a nontoxic material commonly used in water treatment plants to clarify drinking water. In lakes alum is used to control algae, not by killing the algal organisms, but by reducing the amount of the nutrient phosphorus in the water. Like most other plants, algae requires phosphorus to live an reproduce. Algal growth is usually limited by the amount of that mineral available in the water.



Today, it is one of the most widely used and versatile industrial chemicals.

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, flocculant, recipitant and emulsion breaker. As a coagulant and flocculant, 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

1. Water treatment: used as a coagulant to remove suspended solids and or some metals (eg Cr, Ba, Cu) from water (either drinking water or in waste treatment facilities).

2. Paper sizing: used as a rosin sizing control in paper production, affects the drainage of liquor from the paper