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The Digester Building is where we send the waste activated sludge after it has served it's purpose in the Main Plant. Waste activated sludge (WAS) was originally return activated sludge (RAS), before it is sent to the digester. As someone (probably an operator at the plant) told me once upon a time. "The digester is the old folks home for the microbes that feed on the waste water coming into the plant". This is really true as there is only one way out of the digester and that is in a truck headed to the landfill or sludge sight. The WAS has to stay in the digester for a certain amount of time before it can be processed to be sent to the landfill. After it has met that criteria, it is run through a centrifuge to de-water the sludge as it is in liquid form and not easily transportable nor usable for composting in liquid form. The centrifuge removes the majority of water from the sludge and now is called "cake". The digester has similar characteristics to the main plant in that it has a lot of the same equipment. The Aspen Sanitation District's digester is an aerobic digester so it requires air for the process.


 











Digester Building
 
 
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