Class 7 Biology Forests: Our Lifeline Solid wastes

Solid wastes

  • Solid wastes refer to everything that goes out in trash.
  • Municipal solid wastes are wastes from homes, offices, stores, schools, hospitals.


Fig. solid wastes 

Types of solid wastes

  1. Bio-degradable- the wastes which can be degraded by microorganisms. Example- food materials.
  2. Recyclable- the wastes which can be converted into new materials. Example- glass, paper.
  • Non-biodegradable-the wastes which cannot be degraded or takes long time to get degraded. Example – plastic.

Prevention of solid wastes

  1. Reduction in use of plastics and use of eco-friendly packaging.
  2. Carrying cloth or other natural fiber carry-bags.
  3. Refusing polythene bags.
  • Burning and open dumps are used to reduce the volume of the wastes.
  • Open dumps serve as the breeding ground for rats and flies.
  • Sanitary landfills were adopted as the substitute for open-burning dumps.


Fig. Landfill

  • Polyblend is a fine powder of recycled modified plastic which is mixed with bitumen to lay roads.
  • Hospitals wastes contain disinfectants, harmful chemicals and pathogenic micro-organisms.
  • Incinerators are used to dispose hospital waste.
  • Irreparable computers and other electronic goods are known as electronic wastes (e-wastes).
  • E-wastes are buried in landfills or incinerated.


Fig. electronic wastes

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