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In this research a new efficient adsorbent of dyes is used. Thus, adsorption of some textile dyes from aqueous solution by using an industrial waste lignocellulosic product is studied. Between five dyes tested, three dyes were chosen for testing: Direct Orange 26, Acid Orange 7, Acid Green 20. Kinetics of adsorption and equilibrium isotherm of dyes was investigated using Longmuir and Freundlich models. This study showed that the beech wood sawdust could be employed as low-cost and effective sorbent for the removal of dyes from aqueous solution.

Thanks to multiple recirculation of process water, the German paper industry has succeeded in decreasing the specific fresh water demand from an average of 50 m3/t thirty years ago to 13 m3/t today. Although the increasing closure of white water loops creates many problems, it is bound to be part of the German paper industry's ongoing development. For a few years, in the production of packaging paper, two paper mills have been running with a totally closed water system including different process water treatment plants as 'kidneys'. This paper presents a comprehensive survey of the pros and cons of closed process water systems followed by significant examples of effluent-free production of corrugating medium and test liner. Additionally, operation experiences and economic aspects are discussed.