WBWRF Aeration Basin Hyperboloid Mixers ( WBP 9000 )

2026-11-03

The City ’ s WBWRF currently operates an aeration basin with 3 anoxic treatment zones . Each of these zones contains ( 2 ) axial flow impeller mixers . There are a total of ( 6 ) mixers in the aeration basin . The City would like to replace these ( 6 ) axial flow mixers with hyperboloid style mixers to minimize or eliminate air entrainment into the basin zone . The ( 3 ) basin zones are separated by submerged baffle walls and are in a linear flow configuration . The common basin floor is sloped in the linear flow direction and therefore the basins have different liquid depths . Dimensions of each zone are 44 ’- 6 ” long by 16 ’- 0 ” wide by an 18 ’- 0 ” approximate water depth ( depth varies with floor slope and zone water surface elevation ). Construction drawings of these zones have been included in the Technical Specifications . The existing mixers are supported from a steel structure walkway above the anoxic zones . It is the intent to mount the new mixers to the existing walkway structural steel . The new mixer baseplate will need to be designed to mount to the existing steel beams . Construction drawings of the walkway structure have been included in the Technical Specifications .

Idaho

2026-05-11