Disposing Plastics
6 Minutes
Plastic waste disposal for students explains the 5R principle of refuse, reduce, reuse, recycle, and recover. An English science lesson.
- Reusing plastic bottles for drip irrigation and potted plants
- Refusing single-use bags and reducing waste by buying in bulk
- Turning plastic into fuel via pyrolysis and power in incinerators
What this lesson teaches
The five R principle is a waste management system that guides how to handle plastic through five actions: refuse, reduce, reuse, recycle, and recover. Following this process changes the harmful pattern of making, using, and throwing away plastic, which takes 500 to 1,000 years to decompose.
Refusing and reducing plastic
- Refusing means saying no to plastic by carrying reusable bags to supermarkets or restaurants for food takeaways.
- Reducing means cutting down plastic purchases by buying daily essentials in bulk rather than in small packets.
- Buying one large shampoo bottle for a whole month, for example, avoids throwing away four separate plastic sachets every day.
Reusing plastic at home and on farms
Reusing means giving an item a new purpose after its original job is finished rather than discarding it. Clean plastic covers can be kept for future shopping trips or given to someone else to use. Empty plastic bottles can also be converted into pots for growing plants, or used in drip irrigation systems to water crops in areas facing water shortages.
Recycling plastic and making fuel
Recycling turns discarded plastic into useful new products such as shirts, shoes, bottles, and spoons, which helps protect land, water, and air from pollution. Plastic can also be cut into pieces and heated between 300 and 500 degrees Celsius without oxygen through a process called pyrolysis. This converts plastic waste into an oil-like fuel that can power factory machinery, replace kerosene, or even fuel rocket engines.
Recovering energy in incinerators
Recovering is the process of converting non-recyclable plastic into a different form of energy, such as electricity. Burning plastic openly damages the environment, so waste is instead burned inside specialized machines called incinerators. Facilities such as those in Singapore burn plastic to generate electricity in a single day, filter out toxic exhaust gases before releasing clean air, and bury the remaining ash on an island in the sea.