The Riviera Utilities Wastewater Treatment Plant at Wolf Creek serves its community of approximately 20,000 residents and had been operating a biological treatment system consisting of a 35-year-old extended aeration oxidation ditch process. The plant was rated for 2.0 mgd and needed to expand capacity to 3.5 mgd due to growing demand. Instead of taking the traditional approach of adding an additional oxidation ditch to increase treatment capacity, Riviera Utilities had the desire to future-proof the plant and prepare to meet more stringent effluent requirements, including biological nutrient removal, that were anticipated to be enacted in the future. For these reasons and others, aerobic granular sludge technology was the treatment process selected to achieve these goals. 

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