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US 8,894,856 B2Granted
Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
AssigneeEvoqua Water Technologies LLC
InventorsWenjun Liu, Edward John Jordan, George W. Smith
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Abstract
A hybrid method and system of treating wastewater with reduced energy usage is disclosed. The treatment system has a sorption system, an anaerobic digester that digests or converts at least a portion of the solids or sludge from the sorption system, and an aerobic treatment tank that partially reduces oxygen demand of a portion of the sludge from the sorption tank.
Claims20
A process for treating wastewater comprising:
- providing wastewater comprising dissolved and suspended solids;
- promoting aggregation of at least a portion of the dissolved and suspended solids to produce a first mixed liquor;
- separating the first mixed liquor into a first solids-lean portion and a first solids-rich sludge;
- anaerobically digesting a first portion of the first solids-rich sludge to produce an anaerobically digested sludge;
- separating the anaerobically digested sludge into a second solids-lean portion and a second solids-rich sludge;
- precipitating one of a phosphorous containing compound and a nitrogen containing compound from the second solids-lean portion;
- and
- combining a portion of the second solids-rich sludge with the wastewater.
5 more elements
Dependencies are inferred from the claim text.