Color me skeptical.
To burn the solids you must first separate it from the liquids and dry it thoroughly. Evaporating or vaporizing water takes a LOT of energy.
I will be very surprised if there’s enough fuel value here to even run the machine, much less produce “excess” electricity.
Willing to be convinced, but I’d like to see the input/output specs.
Dewetting sewage sludge to 2% moisture for it to be used in combustion fuel applications requires 300 times (X). The use of heat in dewetting and drying is not linear.