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US 10,294,134 B2Granted
Systems and methods for enhanced facultative biosolids stabilization
OwnerAlbert Bock, Stephen R. Wilsoninventors
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OwnerAlbert Bock, Stephen R. Wilsoninventors
Estimating the term…
A control system and method for digestion of waste activated sludge (“WAS”) includes treating the WAS first at anaerobic conditions for≤ a fixed period of time and then at aerobic conditions for≤a fixed period of time prior to either dewatering or optional anoxic conditions followed by dewatering, supplying air to initiate aerobic conditions when a predetermined set point for maximum ammonium nitrogen has been reached within the fixed anaerobic time, and initiating dewatering or optional anoxic conditions followed by dewatering when a predetermined set point for minimum ammonium nitrogen and optional standards for vector and pathogen reduction are met within the fixed aerobic time, the method and system including monitoring either consumption of soluble alkalinity or orthophosphate reduction or both for maximum orthophosphate reduction within aerobic time.
A method for digestion of waste activated sludge (“WAS”) to provide stabilized biosolids comprising the steps of initiating anaerobic conditions in the sludge, initiating aerobic conditions in the sludge in response to either a predetermined maximum ammonia concentration or a predetermined maximum anaerobic time, and dewatering the sludge to provide stabilized biosolids in response to a predetermined minimum ammonia concentration and under predefined minimal aerobic conditions to substantially limit increasing the concentration of reactive phosphorous species in solution.
A method for digestion of waste activated sludge (“WAS”) to provide stabilized biosolids comprising the steps of:
A method for digestion of waste activated sludge in a digester to provide stabilized biosolids, the method comprising the steps of:
Dependencies are inferred from the claim text.