ARGE Astra Volketswil AG operates a full-recovery facility for waste from public road maintenance, treating street sweepings and collector sludges using a wet-mechanical process. The plant separates materials into five output streams, concentrates heavy metals into a problem fraction, and directs the cleaned mineral fraction, composted organic residues, treated wastewater and foreign materials to appropriate re-use, composting, sewage treatment or incineration; contaminated residues can be used as alternative raw material in cement production.