Deposing of Plastics

• When items made from polymers are finished with they will need to be disposed of.

• The traditional method of dealing with waste is to 'land fill' it, this involves dumping waste in a hole in the ground

The problem is many polymers are not

biodegradable

• This means they are not broken down by microorganisms • If dropped as litter then it will remain there until picked up as it will not rot • The alternatives are to: – Incinerate the plastic – Recycle them

• If the plastics are incinerated the heat produced can be used to generate electricity • Although potentially toxic waste gasses need to be contained and dealt with • Also Carbon Dioxide will be released

• The best way to deal with waste polymers is to recycle them • This is an expensive option as polymers need to be: –

Collected

and –

Separated

• To aid sorting many plastic items have a recycling code on them

Polyethylene Terephthalate High Density Poly(e)thene Vinyl (Polyvinyl Chloride or PVC) Low Density Poly(e)thene Plastic bottles, ovenable prepared food trays Carrier bags, Yoghurt pots, milk bottles, margarine tubs, cereal box liners Clear packaging, medical tubing, wire and cable insulation, window frames, drain points Dry cleaning, bread and frozen food bags, squeezable bottles, e.g. honey, mustard. Polypropylene Yogurt containers and margarine tubs, medicine bottles Polystyrene Compact disc jackets, meat trays, egg cartons, aspirin bottles, cups, plates, cutlery. Other or Combination

• Despite the extra effort needed to recycle polymers… … it does have the benefit of reducing the consumption of

crude oil

• This will allow crude oil reserves to last longer