La depurazione dei reflui degli impianti di produzione del biodiesel = Purification of waste from biodiesel production plants

Biofuels production, particularly biodiesel, is an industrial activity whose budge is increasing rapidly. Industrial process produces wastewater with high organic carbon concentration from methyl alcohol, glycerine, fatty acids and a small amount of biodiesel, and high salts con- centration. These wastewaters are readily biodegradable but wastewater treatment plants need large volume in oxi- dation basins and chemical – physics treatments to elimi- nate carbon not readily biodegradable and to reduce salts concentration. Reverse osmosis treatment is an efficient remedy with plane membranes but it is an expensive treatment also for the reduction of concentrate. It’s possible to use less expensive treatment if salts concentration are reduced during industrial productive processes.