When it comes to saving energy and protecting the environment at its tertiary wastewater treatment plants, the philosophy at the City of Roseville (Calif.) can be described in a single word: diligence.“We recognize that we work for our ratepayers who rely on us to protect their health and the environment, and do it in a cost-effective way,” says Art O’Brien, wastewater utility manager. “It requires diligence and asking ourselves: Can we do that? Can we do it efficiently? Can we do it better?”At the Dry Creek Wastewater Treatment Plant (18-mgd average dry-weather flow) and the Pleasant Grove Wastewater Treatment Plant
