Island Wastewater Treatment Plant Facility Plan

Island Wastewater Treatment Plant Facility Plan

Location: Lake Havasu City, Ariz.

Client: City of Lake Havasu City

Completion Date: 2006

Burns & McDonnell was retained by the City of Lake Havasu City, Ariz., to perform an evaluation, prepare a facility plan and engineer the improvements for an upgrade of the Island Wastewater Treatment Plant (WWTP), which has an existing capacity of 2.5 million gallons per day (MGD). With the expansion of the city’s wastewater utility, the plant needed to be upgraded.

  • Facility planning
  • Hydraulic modeling and analysis
  • Detailed design

Lake Havasu City is on the Colorado River in west central Arizona. The city’s 36,000-acre planning area supports a population of 41,000 with buildout projected at 96,000. About 20 percent of the population was served by the existing sanitary sewer collection system, with the remainder on individual septic tanks.

The facility plan identified several needs within the WWTP to meet the future flows. Among the recommended alternatives were a new aerobic digester, new ultraviolet (UV) disinfection system, odor control, sludge pumps, an effluent pump station, a new headworks building, biosolids dewatering, and a complete renovation of the WWTP electrical and controls systems.

Another need identified was for additional aeration capability. Due to site limitations, it was not possible to construct an additional aeration basin. Because of the limitations, Burns & McDonnell recommended that the radial aeration bridge be replaced with a full diameter bridge. This recommendation resulted in a significant cost savings for the owner.

Facilities upgraded or added to the existing treatment plant:

  • Influent flow meter
  • Headworks building
  • Additional aeration capacity
  • Renovation of an existing secondary clarifier
  • Aerobic digester with new sludge pump capability
  • New UV disinfection
  • Chemical feed system
  • New electrical building and complete rework of plant wide electrical system