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Polymer Problems

recycling etc

QuestionAnswer
What are the current methods for disposing of polymers? landfill, incineration and recycling
Why can we not continue to use landfill as a method? UK landfill space will run out
Why should plastics be recycled? non biodegrability
Problems with recycling. plastic waste contains heavy metal ions and colourants
Why is simply reusing plastics better? no processing therefore saves energy and oil resources
First stage of recycling sorting (using optical scanning techniques)
Why is it important to sort the plastics? distinguish PVC as when heated releases toxic dioxins
Second stage of recycling reclamation (processing into small flakes before washing)
Alternative use for waste polymers burning under controlled conditions to generate electricity
Another alternative use feedstock recycling, convert polymers into synthesis gas to then use as a chemical feedstock
Problems with PVC recycling high chlorine content makes PVC recycling uneconomical end product costs more to recycle than manufacture from crude oil
What happens to PVC instead? PVC is incinerated to prevent from entering landfill
Problems with PVC incineration create acidic hydrogen chloride fumes resulting in toxic fumes and corrosion in the plant
What does the plant do to minimize these problems plant is fitted with pollution control apparatus to minimise release.
What are bioplastics plastics that are biodegradable or compostable
What are bioplastics made from? starch, maize, cellulose and lactic acid.
How do bioplastics degrade? bacterial activity
What do bioplastics degrade to? carbon dioxide and water
Created by: 07blandforderin
 

 



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