When the Moundsville (W.Va.) Wastewater Treatment Plant experienced a blower failure, the staff naturally assumed they should repair the failed unit to keep the system design intact. At the time, two 75 hp centrifugal blowers fed air to the plant’s four aeration tanks, and a third centrifugal blower unit served as a backup.
However, plant personnel decided to place the repair on hold pending an evaluation of tank conditions. The 2.43 mgd (design) activated sludge plant had been experiencing an issue with pin floc in the aeration tanks, indicating a problem with dissolved oxygen (DO) levels.
In the end, rather than simply
