This paper describes the design and optimisation of the Nambour Sewage Treatment Plant. The plant utilises a 4 Stage Westbank Biological Excess Phosphorus Removal process (3 stage Bardenpho with pre-anoxic zone) and a static primary sludge fermenter (the first of its kind in Australia) to achieve better than a 50 percentile Total Nitrogen 10 mg/l and Total Phosphorus 2 mg/l treated wastewater standard. The plant also uses anaerobic digesters to produce a Grade B stabilised biosolids and lime treatment to remove phosphorus from the sidestream liquors. Commissioning and operational experiences are also discussed.

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