This paper presents the new wastewater treatment plant Amsterdam West: a high-technology and sustainable wastewater treatment plant with a biological capacity of 1.0 million population equivalents. The design is based on the modified UCT process. Due to the limited space, deep activated sludge tanks (8.2 m) and secondary sedimentation tanks (side depth 3.45 m) are applied. The WWTP Amsterdam West was constructed within a period of app. 27 months and started-up in three months. The WWTP Amsterdam West operates well and produces a high-quality effluent, with yearly average concentrations of 6.7 mg Ntotal /l and 0.8 mg Ptotal/l. Biogas and sludge are combusted with high-rate energy retrieval at the nearby Waste and Energy Enterprise Amsterdam.

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