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Currently the Grand Island Wastewater Treatment Plan (WWTP) owns (4) centrifugal blowers for the Aeration Basins. Two (2) of these being Lamson Multistage Centrifugal Model 1857 blowers. The other Two (2) blowers are Howden Single stage Centrifugal Model SG40 blowers. Based on a blower study performed in 2018, a recommendation was formed to replace one of the Lamson blowers with two (2) smaller 4,500 scfm blowers. This would allow the WWTP to efficiently satisfy current average annual airflow needs. A combination of the smaller blowers alongside one of the Howden single stage blowers would be able to satisfy the needs for 2038 projected max day airflow, with 100% redundancy.

The Aeration Basins operate butterfly valves to regulate the airflow to individual zones within the Basins. It has been recommended to replace these butterfly valves with more linear adjusting control valves, such as iris-style valves. These new valves would offer superior efficiency and precision in controlling the airflow. Specific valve sizing relative to the new airflow needs would need to be analyzed.

The engineering services would also include evaluating electrical distribution; instrumentation and controls compatibility; analysis of all replaced or new system items for full Aeration Basin system compatibility; analysis of all piping compatibility, sizing, and flow efficiency; design improvements of closed loop dewatering system; structurally analyzing Aeration Basin joints to develop solutions and repair instruction for all Aeration Basins. Cost estimation will be required for all modifications and improvements.