Mesa Southeast WRP Aeration Improvements

The City of Mesa treats a maximum flow of approximately 4.5 MGD raw sewage although the facility’s rated average day capacity is 8.0 MGD.  The facility is equipped with centrifugal blowers and outdated course bubble diffusers for process aeration and channel mixing.  Even though they have optimized the blower controls, the excess air must still be wasted to the atmosphere to maintain target dissolved oxygen levels in the aeration basins. The blowers are oversized for the current operating conditions and cannot operate efficiently at varying air demands.

Valentine provided two options to install turbo blower technology and keep the outdated coarse bubble diffusers or install turbo blower technology with a fine bubble aeration system.  Based on the analysis, the latter was the more efficient system saving an estimated $185,000 in annual energy costs and has a 5 year payback.

Valentine performed the design and permitting for the turbo blower and fine bubble diffuser retrofit for the City of Mesa facility.  This project will be funded partially by the American Resource and Recovery stimulus funds and is estimated to receive $125,000 from SRP.

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Completed Blowers