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US 9,359,238 B2Granted
Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
AssigneeEvoqua Water Technologies LLC
InventorsWenjun Liu, Edward John Jordan, Marc Roehl
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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.
Claims10
A method for treating wastewater comprising:
- providing a wastewater to be treated;
- promoting biological sorption of the wastewater to be treated in a biological sorption contact tank to produce a mixed liquor;
- producing a solids-rich sludge and a solids-lean portion from the mixed liquor;
- combining a first portion of the solids-rich sludge with the wastewater to be treated;
- introducing a second portion of the solids-rich sludge into a sludge thickener to produce a thickened sludge and a sludge-lean stream;
- combining the sludge-lean stream with the wastewater to be treated;
- anaerobically digesting the thickened sludge to produce an anaerobically digested sludge;
- combining a first portion of the anaerobically digested sludge with the wastewater to be treated;
- aerobically treating a second portion of the anaerobically digested sludge to form an at least partially aerobically treated sludge;
- and
- combining the at least partially aerobically treated sludge with the wastewater to be treated.
8 more elements
A method for treating wastewater comprising:
- providing a wastewater to be treated;
- separating the wastewater to be treated into a solids-lean wastewater and a solids-rich wastewater;
- promoting biological sorption of the solids-lean wastewater in a biological sorption contact tank to produce a mixed liquor;
- producing a solids-rich sludge and a solids-lean portion from the mixed liquor;
- combining a first portion of the solids-rich sludge with the wastewater to be treated;
- introducing a second portion of the solids-rich sludge into a sludge thickener to produce a thickened sludge and a sludge-lean stream;
- combining the sludge-lean stream with the wastewater to be treated;
- directing the thickened sludge together with the solids-rich wastewater into an anaerobic digester;
- anaerobically digesting the thickened sludge and the solids-rich wastewater together in the anaerobic digester to produce an anaerobically digested sludge;
- and
- combining a first portion of the anaerobically digested sludge with the wastewater to be treated.
8 more elements
Dependencies are inferred from the claim text.