Not an expert, but I assume remaining particles are filtered from the exhaust fumes and/or remain part of the remaining sludge. Pyrolysis seems also like a thi

Not an expert, but I assume remaining particles are filtered from the exhaust fumes and/or remain part of the remaining sludge. Pyrolysis seems also like a thing that hopefully becomes viable: https://en.wikipedia.org/wiki/Thermal_depolymerization https://en.wikipedia.org/wiki/Thermal_depolymerization