John L. Willis, P.E., DEE

John L. Willis, P.E., DEE's Posts

Upgrading to Class A anaerobic digestion

More utilities are looking at producing Class A biosolids from municipal wastewater sludges as a way to reduce their regulatory requirements and improve their program's image with the public. The question is, what is the best way to convert an existing Class B biosolids digestion system into a Class A program? Read more

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