• The difference between sewage and silage

• The treatment of sewage is focused on three things.​

  • ​Removal of suspended matters

  • Reduction of the organic matter

  • production of germ-free water

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​18PDH103T-Social Engineering

​Three stages of treatment of sewage water

• Primary or physical treatment

  • ​removing solid materials using metal screening.

• Secondary or biological treatment

  • ​biological oxidation on the stone bed, growth of algae & fungus. Where the water gets oxidised.

• Tertiary or chemical treatment

  • ​chemical, ozone, or UV process, removes the disease-causing bacteria and other germs.

18PDH103T | Social Engineering

Liquid Waste Management

• responsibilities of the government.

• responsibility and role of industries.

• responsibilities of the citizen

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​18PDH103T-Social Engineering

​E-Waste Management​

" Zero waste is a goal that is ethical and economical, to guide people in changing their lifestyles and practices to emulate sustainable natural cycles, where all discarded materials are designed to become resources for others to use. " 

​Zero Waste Management