Sludge is wasted from the secondary system to a gravity thickening tank, and then pumped to holding tanks.
Sludge is pumped from these holding tanks to one of two 2.2 meter filter belt presses.
After the thickened sludge is dewatered to a 17 – 20 % cake, it is conveyed to a pugmill where it is mixed with cement kiln dust, a byproduct of the cement production industry.
Biosolids are loaded for land-application.
The high alkaline cement kiln dust lime-stabilizes the sludge to produce Class B biosolids, which are then land-applied. The plant produced and land-applied 22,000 tons of Class B biosolids in 2005.