Death Of Three Young Ladies Backpacking...
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No best answer has yet been selected by pigface. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.It is possible that your authority has access what is known as a materials reclamation centre, which is the glamourous name for a big conveyor belt that poor sods stand at & pick out the categories of recyclates that cannot be sorted by machine/magnet.
They cost on average 2 -3 million to build so it could be that several neighbouring authorities have clubbed together to buy & run one.
The reason the authorities decide to seperate for the householder is to obtain the highest rate in pure recyclates. Research has shown that householders are reluctant to spend hours a month seperating waste & prefer the easiest method possible.
The short answer is "yes, it's all sorted by hand".
As you say, ferrous content is extracted by magnet (steel tins/cans etc).
Domestic plastics are not usually worth sorting, apart from PET (poly ethylene terephthalate) - ie the big 'pop' bottles - even then it's low value and cannot again be used for 'food use'. (The highest value PET is called 'pre-consumer scrap' which comes in bulk from the plastic bottle manufacturers and is made up of all their rejects.)
Paper collected from domestic 'mixed recycling' sources (where you put all your re-cyclables in one bag) are all-too-often contaminated to be worth salvaging. (Contaminants in this case can be anything from broken glass mixed up in the waste, baked beans from unwashed cans, or 'cat litter' where people have used newspaper to line litter trays and then re-cycle it !!) Where newspaper etc is collected separately, and therefore presented 'in bulk', then yes, it is recycled.
Large scale waste producers (such as supermarkets) can supply higher quality material for re-cycling as the waste is less often contaminated. (ie they supply a whole pile of single grade cardboard or another of polyethene)
From the landfill sites I've visited that operate RDWS (recyclable domestic waste salvage) it is all sorted by magnet first, then hand-picked for aluminium, PET, glass and paper. Though if the paper is at all dirty, or comes down the line as single sheets (and not in bulk) it is passed over and just ends up in the rest of the landfill.
Moral of the story, is that if for every 99 conscientious recyclers, it only takes 1 person to put any old sh1te in the bag for the whole batch to be written off.