Das Projekt "Chemical and process parameter based forecast of organic loads in the inflow and outflow of effluent treatment plants in deinking mills" wird vom Umweltbundesamt gefördert und von Papiertechnische Stiftung durchgeführt. Improving the forecast of organic loads in the inflow and outflow of effluent treatment plants in deinking mills as a function of raw material properties and process parameters. Providing reliable information for optimum plant design and deriving reasons and arguments for extended effluent treatment in paper mills with deinking plants. Initial situation / Problem area: The effluent loads of deinking paper mills producing recycled-fibre based newsprint, household and sanitary papers amount to between 13 and 22 kg COD/t paper. After biological treatment, the residual COD loads are in the range between 2.3 and 6.4 kg/t. The COD load of deinking mill effluents is reduced by 75 percent- 85 percent by biological treatment, whereas the COD reduction of other paper mill effluents reaches 90 percent or more. The causes of these differences in effluent loads and biological treatment efficiencies have not yet been fully identified. This leads to relatively high error rates of load forecasts based on present knowledge. As a result, the construction or reconstruction of paper mills and effluent treatment plants involves high planning risks. Objectives / Research results: Improving the forecast of organic loads in the inflow and outflow of effluent treatment plants in deinking mills as a function of raw material properties and process parameters. Providing reliable information for optimum plant design and deriving reasons and arguments for extended effluent treatment in paper mills with deinking plants. Application / Economic benefits: The project results will allow for a more accurate planning or design of reconstruction and extension measures in paper mills with deinking plant, to avoid over-dimensioning and minimize investment costs. The reduction of residual COD loads can - at least in Germany - save effluent discharge fees. A further cost saving potential lies in the reduction of effluent treatment costs.