Plant surveys and process modelling have been undertaken to characterise the wastewater system at Australian Paper Maryvale. A biological survey has been undertaken to understand the underlying biology and a model has been developed to track key nutrients throughout the process. The model includes the transfer of components between the dissolved liquid phase and the solid phase. The model includes clarifier separation efficiency, aerobic generation of biomass and transfer of nutrients between sediments and the active part of the process. The process model has been developed through sampling and analysis of liquid phase and solid phase components for each parameter. The model enables assessment of EPA licence compliance under different operating conditions, and provides a reference to identify changes in the underlying biology.
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