The group think around here is so crazy. Should we be using less single use plastic, especially the thin films? Absolutely. But the environmental impacts of mining all that metal and making all that glass to replace plastic with, plus the added energy for transporting the heavier packages and the cost of increased spoilage and product lost to dented cans and broken bottles, dwarfs the negative impact of the plastic replacements.
I actually work in the wastewater industry and from what I’m reading, a properly functioning sewage treatment plant already captures a very high proportion of microplastics. This widely cited study noted above 98% removal efficiency at one plant.
We’re already at approaching 2 log (99%) removal without actually trying to. It doesn’t seem improbable to me that with a few relatively modest tweaks to the system we could get 3 log removal (99.9%). Getting to 4 or 5 log removal is likely where things will get really expensive and challenging. But for now, a 2-3 log removal is probably good enough to focus on other sources like tire fragments/dust that typically pass directly to receiving waters with no treatment at all.