What happens with the microplastics that are filtered out?

"The microplastics that we filter out only make up for a very small fraction of all the plastics that are filtered in a wastewater treatment plant. In addition, these particles carry toxins, hormones, and drug residues. To clean the particles from these substances would require a massive effort, which would cost more energy and resources than the particles make up. Thus we decided to retain the particles and toxins in the sewage sludges and incinerate them combined for energy production (as is done widely in Europe). We need the particles and especially the toxins to be terminated, as they must never find their way back into the environment. This is a drawback, we know, but it is the smallest that we offer.

If the sludges are not incinerated, we plan to filter the particles with a final filter based unit, which can be small and pressure-less in order to be cost-effective.