this post was submitted on 02 May 2025
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The biggest issue seems to be around a lake of thinking. Recycling used plastics into more plastic is certainly energetically infeasible, and letting plastics escape to contaminate the environment is also unacceptable. However plastic can be recycled, or perhaps reused, into other things, notably as a partial replacement for aggregate in concrete. This process is low energy, doesn't require sorting the plastic, and actually enhances the thermal and noise insulation properties of the concrete, whilst also reducing it's overall weight. There are undoubtedly other things a stable, non-biodegradable, waterproof and hardwearing substance could be used for given some though.
Putting it in concrete just delays the inevitable.
It does, but it will also bind a lot of the micro plastic pieces into the concrete matrix, which, I think (and, again, as I said, I haven't actually gone looking for any research on this), would keep them from entering the environment. If the concrete is then recycled, typically by crushing and using as aggregate, it would further trap the particles. It's not a perfect solution, but I don't think there is a perfect solution to plastics in general, we just have to find less harmful alternatives.
Best solution imo is burning it with a filter after use. Gasification will happen anyway but this way at least it doesn't damage ecosystems.