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Energy Savings through Diffuser Modification | Taylorsville, NC


Cusomter Profile

The Town of Taylorsville, NC, Department of Public Works operates an activated sludge wastewater treatment facility serving a population of approximately 2,100 persons.

Project Summary

When the Town of Taylorsville (Town) recognized the need to replace the diffusers in their aeration basins, they were open to either a replacement in kind or an upgrade. Satisfied with service they had received from the existing EDI system, they called EDI and asked us to bid on the performance-based specification. The resulting upgrade saved energy while providing flexibility and potential increased capacity.

Aeration Requirement Reduced by 25% While Maintaining Treatment

Gathering and analyzing this data provided EDI invaluable insight and guidance when designing a new, “best-value” aeration system capable of achieving all city objectives. EDI designed, fabricated, and installed a new aeration system composed of a 6” structural concrete floor slab in the primary aeration basin. This slab supported a fixed-grid, 9” diameter fine-bubble disc system. EDI installed a new DO probe and a new airflow meter to replace the original devices which were not functioning properly. They also added a transmitter connecting these instruments to the existing SCADA system for easier operator control. A new header and piping arrangement was fabricated and installed to accommodate future expansion.

Standby Basin for Extra Load; No Construction

The Town now has a standby basin capable of treating the total flow, making maintenance easier and much less stressful. Having a standby basin provides operational flexibility and greater stability to the treatment. In the future, the standby basin could also be used for increased treatment capacity, an important consideration for a Town that realized a 14.7 percent growth rate in the latest census.


“The entire operation from EDI was first rate, professional from start to finish. Not only did they provide an aeration system that saves us energy, it also provides flexibility and expansion potential. The EDI crew was easy to work with and clearly cared about the Town and our overall needs. Their professionalism and attention to detail resulted in a smoothly executed project, which is quite an achievement when making modifications to existing equipment. To be honest, if I could have persuaded their site foreman to come work for the Town, I would have.”

-David Odom, Plant Manager