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Organosolv delignification of 2–3 years old Eucalyptus globulus with formic or acetic acid produced bleachable grade pulps with kappa number values of 20–35. Pulp yields for the acetic acid treatment (45–55%) were higher than for formic acid (32–46%) although also they showed the greater kappa number.Delignification was modelized by means of the accomplishment of respective factorial designs of experiments...
A coagulation/flocculation method for the treatment of tannery effluents is described in which alkaline FeCl 3 is used as flocculating agent and Ca(OH) 2 as base/precipitant. Two cycles of the treatment reduced the chemical oxygen demand (COD) of the effluent by 87%, producing a colourless, odourless wastewater with no appreciable suspended solids. Further repetition produced no further...
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