Question

Write a note on industrial waste water treatment .

Answer 1

• Water pollution refers to the addition of any substance to water that may cause changes in its physical and chemical properties and interfere with its use for legitimate purposes. The following are indications that water is polluted:

1. Bad taste or offensive odour
2. Reduction in number of aquatic lives in rivers, fresh water, seas.
3. Oil or grease floating on the surface of water.
4. Unchecked growth of aquatic weeds. 5. Outbreak of an endemic.

• Treatment of industrial waste water: The treatment procedure for industrial waste water is the same and consists of the preliminary, primary, secondary and tertiary treatments. The nature of the pollutant determines the type of treatment employed for industrial waste water. For example, waste water from dairy and food industries require biological treatment, metal plating industrial waste are chemically treated. Many industrial wastes may even require neutralization prior to chemical or biological treatment methods.