The large knowledge gained from the dewatering of sludge in the recovery of water from aggregate washing, one of the first applications in which the BARIGELLI Decanter experienced with excellent results, has allowed the development of highly reliable machines in the most diverse situations, even in those cases in which the sludge to be processed is highly abrasive; typical case, the dewatering of sludge from backwashing of filters or water purifying. Nowadays, the use of BARIGELLI Decanter machines ranges from dewatering of urban and industrial origin sewage sludge, treatment and recovery of refinery products, sewage treatment of effluents from factory farming and bio-diesel, to that of animal slaughter and distillery effluents, as well as to the tannery.