Southeast Water Reclamation Plant Aeration
Project Number 10-479-001
The City of Mesa has awarded this project to
The project is delayed over an electrical item. The City and the
contractor are working to resolve the concerns.
Construction on this project began in December 2011 and
is estimated to be completed at the end of August 2012.
The SEWRP currently operates with
centrifugal blowers and coarse bubble diffusers for the
treatment process in the aeration basins. The existing blowers
operate inefficiently in that they cannot be “turned down” when
the demand for air required to meet treatment needs is reduced.
The coarse bubble diffusers are also less efficient than fine
bubble diffusers resulting in higher energy costs to the City.
This project will install three (3)
new energy efficient air bearing turbo blowers and a new fine
bubbler diffuser system for the two existing aeration basins.
The new air bearing turbo blowers have variable speed drives
that will allow the air flow to be adjusted to meet treatment
The procurement of all three (3) blowers is being pursued through a separate purchase contract by
the Purchasing Department. This separate procurement will save
time in the equipment design, manufacture, and delivery. This
project also replaces the inefficient coarse bubbler diffuser
system with a fine bubbler diffuser system. The new fine bubbler
diffuser system will result in treating the wastewater at lower
energy costs. The City expects to recoup its capital investment
in seven (7) years through the energy savings and reduced
The recommended total award amount for this project is
$1,337,490.00 based on the low bid amount of $1,215,900.00 plus
an additional $121,590.00 (10% allowance for change orders).
Funding is available from the FY 11/12 Wastewater Bond Capital
Program ($582,490.00) and DOE Efficiency and Conservation Block