40% are processed through chemical-physical plants: a very old and messy technology, still the industry standard.
Metals are separated through sludge precipitation, which is then sent to landfills.
Sludges still represent 20-35% of initial water volumes. The problem is NOT solved but, moved to the landfills.
Progressive saturation of existing landfills and the stricter rules are pushing up the cost of sludge disposal.
Only 38 % of surface water bodies are in good CHEMICAL STATUS.