Vermistabilization (i.e., sludge stabilization and dewatering using earthworms) has been investigated in numerous locations and has been successfully tested full scale on a pilot basis (Donovan, 1981; Eastman et al., 2001). A potential cost advantage for the concept in wastewater treatment systems is the capability for stabilization and dewatering in one step as compared to thickening, digestion, conditioning, and dewatering in a conventional process. Vermistabilization has also been used successfully with dewatered sludges and solid wastes. The concept is feasible only for sludges that contain sufficient organic matter and nutrients to support the worm population.

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