Upgrade Produces Exceptional Effluent Quality Client: City of Eau Claire Location: Eau Claire, Wisconsin The City of Eau Claire operates an 11.5-mgd regional wastewater treatment facility. Donohue worked collaboratively with the City through planning, design, and construction of a complete replacement of the secondary treatment system with a biological phosphorus removal activated sludge system. The project included an overhaul of the anaerobic digestion system, biogas conditioning system, biogas utilization system (combined heat and power), primary and secondary settling improvements, a supplemental alkalinity system, an odor control system, and biosolids handling improvements. The upgrades also included a new automation system intended to minimize operator attention and change staffing f

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