The issue of residues and industrial effluents represents an unprecedented environmental challenge in terms of recovery, storage,\nand treatment. This work discusses the perspectives of treating effluents through anaerobic digestion as well as reporting the\nexperience of using an upflow anaerobic sludge blanket (UASB) reactor as biorefinery annex in a pulp and paper industrial plant to\nbe burned in the boilers. The performance of the reactors has shown to be stable under considerable variations in load and showed\na significant potential in terms of biogas production. The reactors UASB treated 3600.00m3 of effluent daily from a production of\n150.00 tons. The biogas generation was 234.000 kg/year/mill, equivalent in combustible oil. The results of methane gas generated\nby the anaerobic system UASB (8846.00 kcal/m3) dislocate the equivalent of 650.0 kg of combustible oil (10000.00 kcal/kg) per day\n(or 234.000 kg/year). The production of 8846.00Kcal/m3 of energy frombiogas canmake a run at industrial plant for 2 hours. This\nsubstitution can save US$ 128.700 annually (or US$ 550.0 of fuel oil/tons). The companies are invested in the use of the biogas in\ndiesel stationary motors cycle that feed the boilers with water in case of storage electricity.
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