Three developments in series may allow primary and waste sludge to be dried with a net recovery of energy. The first development is a novel electro-dewatering process, enabling a belt filter press or decanter to produce up to 40% dry solids. The second is a two-stage dryer, eliminating the need to recycle partially dried product. The third, still in development, is gasification of the dried pellets to provide the fuel for the drying process.
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