Stawimpianti has with time increased its specialisation in sludge treatment plants manufacturing, both industrial (with a low organic content) and municipal types.

A sludge treatment plant is generally composed by one or more hoppers for sludge receipt and dosing, powder storage silos (hydrated lime, calcium oxide, cement, carbonate), a storage tank for sulphuric acid and related machinery (screw and belt conveyors, dosing pumps) for dosing and conveying the products towards a continuous plowshare mixer.

This one, according to production process, is manufactured with special antiabrasion and anticorrosion materials.