Cellulose and paper making industry generates important amount of waste material. The pulp and paper industry is characterized by four major processes: (i) chemical pulping (Kraft or sulphate pulping), (ii) mechanical and chemi-mechanical pulping, (iii) recycled fiber processing and (iv) paper-making related processes. The chemical pulping process produces several residues including inorganic sludge (dregs and lime mud), wood, straw or reed residues, sludges from effluent treatment (inorganic material, fibers and biological sludge), dust from boiler sand furnace. By-products and residues from mechanical and chemi-mechanical pulping include wood, straw and reed residues, fiber rejects, excess sludges from external biological waste water treatment [1].