Abstract
Three industrial wastes arising from bleached hardwood kraft pulps, namely: unbleached screen rejects (USR), effluent treatment (ETW), and eucalyptus bark (EB) were analyzed with the aim of their possible valorization as an alternative source of cellulose. Their morphological properties were determined using MorFi apparatus. For this study the sample bleached kraft pulp, BKP, was analyzed as a reference. Lignin and carbohydrate contents were also quantified. These by‐products were studied as such (i.e. without careful purification) because we intended to find rational and low‐cost way of valorization. In fact any additional operation will induce an over cost. The results obtained indicate that these industrial wastes can be potential raw material in fibre‐based applications (paper, composites…), since they contain a high proportion of cellulose with preserved fibrillar morphology. Some of these materials have low lignin and inorganic residue contents.
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