City of Peoria, Arizona, Beardsley Road Wastewater Treatment Plant

City of Peoria, Arizona, Beardsley Road Wastewater Treatment Plant



Engineering Excellence Honor Award - 1999

Carollo Engineers provided the predesign, design, construction and start-up services for the expansion and upgrade of the Peoria, Arizona, Wastewater Treatment Plant. The existing plant treated 0.30 mgd and the expansion raised the treatment capacity to 3 mgd, with future expansion capacity to 16 mgd. For this $10 million project, Carollo designed and installed the first medium-pressure ultraviolet (UV) disinfection system in a municipal facility in the State of Arizona. (The system is not only effective in eliminating unhealthful organisms in wastewater, but the use of a medium-pressure system, versus a low-pressure system, requires fewer UV lamps to clean and maintain.) Carollo also designed and installed a multi-stage aeration basin system to maximize the efficiency and safety of the plant’s treatment processes.

The operation of the plant is monitored using a distributed control system that ties into Peoria’s SCADA system, allowing the monitoring of the plan from remote locations, if necessary. The proximity of the treatment plan to nearby retirement communities also required extensive odor and noise control design elements. All process units are covered to reduce noise and the air is scrubbed using an odor control unit. Process tankage is ground-set to minimize any negative impact to the communities and maximize operator access.