North Bend to seek authorization to replace wastewater diffusers; staff requests 1,300 units
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Summary
Public works staff asked the council to authorize purchase of approximately 1,300 air diffusers for the wastewater treatment plant, citing wear on existing diffusers and the need for spares during replacement work.
City public works staff on Aug. 11 asked the North Bend City Council for authorization to purchase replacement diffusers for the wastewater treatment plant's aeration basins.
The staff presentation explained that the diffusers provide air to microorganisms that drive the biological treatment process. Over time the medium-bubble diffusers wear, enlarging holes and reducing air delivery; staff said the typical service life is about 10 to 12 years and that many of North Bend's diffusers are approaching 15 years.
Staff requested authorization to buy 1,300 diffusers to replace roughly 1,200 in service and to maintain about 100 spares to allow for damage during removal and future maintenance. The diffusers cited cost roughly $8.70 apiece in staff discussion; staff said they are purchasing the same diffuser type to avoid repiping or redesign of the air distribution system.
Why it matters: the diffusers are integral to treatment performance; deteriorated diffusers can reduce air delivery and affect treatment quality. Staff said the purchase and staged replacement would preserve system operation and reduce the risk of process upset.
Next steps: staff asked the council to include the authorization on the upcoming agenda for formal action; no vote was recorded at the Aug. 11 preview meeting.
