REDUCTION IN SPECIFIC EFFLUENT VOLUMES OF WASTE PAPER RECYCLING MILLS

Increasingly closed circuits in waste paper processing mills result in ever mole frequent production failures and quality problems due to hi gh circuit loading. In a multitude of mills, water circuit conditions were systematically studied. By determining the characteristics K1 and K2, optimization potentials can be identified and suitably elaborated . For all mills involved, proposals for optimization were prepared whi ch have in part already been translated into practice. Simulation calc ulations are a very useful tool in this context. Apart from optimizing water circuits from a process engineering viewpoint, biological treat ment processes may be introduced to reduce circuit loading and specifi c effluent volumes. Depending on the production process and the target ed circuit relief, the rating of biologies has to meet the specific ne eds of the circuit systems concerned. When assessing and implementing all these measures, special attention should be paid to their economic s.