Waste Water and Reuse - Q and A

What is waste water?

Waste Water is contaminated water which can be in the form of industrial waste, manufacturing waste, waste from landfills and sewage.

Trade waste includes all waste with the exception of sewage. Production and manufacturing plants in Australia are required to enter into a trade water agreement and can either re-use or discharge into the environment under the regulations of the EPA and trade waste agreements.

Water is utilised across many industries during the manufacturing process. It is during this process that the water becomes contaminated through exposure to biological, chemical or physical contamination.

How is the water treated?

Waste in water can be in the form of either soluble or insoluble. The contaminants therefore either dissolve or can’t be dissolved. This means the removal of the contaminants is a different application.

Those that are insoluble can be removed by a physical process, and is generally removing solids, grease and fats.

The removal of soluble contaminants is treated by chemical removal. The process generally involves changing the composition to become insoluble.

There are three (3) main steps in the process;

  1. Coagulation
  2. Flocculation
  3. Sedimentation