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Question
Explain prevention of waste or by products which is one of the principles of green chemistry.
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Solution
Prevention of waste or by products:
- According to this principle of green chemistry, priority is given for the prevention of waste rather than cleaning up and treating waste after it has been generated.
- Illustration: To develop zero waste technology (ZWT).
As per ZWT, in chemical synthesis, the waste products should be zero or minimum. - It also aims to use the waste product of one system as the raw material for other systems.
For example:
a. Bottom ash of thermal power station can be used as a raw material for cement and brick industry.
b. Effluent coming out from cleansing of machinery parts may be used as coolant water in a thermal power station.
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