recyclable
They found that PVC and metal were the main components, both of which used to be unrecyclable.
They develop technology capable of recycling previously unrecyclable types of plastic into new products.
Anything containing plastic or some other unrecyclable material would be rejected.

SMART Vocabulary: related words and phrases

Environmental issues
agroecology
air pollution
anoxia
anoxic
anti-conservation
carbon capture
dumping ground
eco-audit
eco-footprint
efficiency
energy conservation
energy security
environmental justice
environmentalism
reduce, reuse, recycleidiom
rewilding
runoff
scrapyard
scrubber
sequester

You can also find related words, phrases, and synonyms in the topics:

Rubbish and waste