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Different operations, such as fleshing, trimmings, cuttings and chips from hides, causes leather industry in being one of the most environmental ?unfriendly? sectors. Moreover, the treatment of sewage waters brings up also the problem of mud which is related with the appearance of biodegradation process of organic waste, followed by the emission of greenhouse gases, especially methane and nitrous oxide. All these wastes also imply a terrible smell and a strong land contamination. The large quantity of wastes, but ...