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US 8,894,855 B2Granted
Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
AssigneeEvoqua Water Technologies LLC
InventorsWenjun Liu, Edward John Jordan, George W. Smith, Joseph Edward Zuback
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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 and an anaerobic digester that digests or converts at least a portion of the solids or sludge from the sorption system.
Claims25
A process for treating wastewater comprising:
- providing a wastewater to be treated;
- promoting biological aggregation of at least a portion of dissolved and suspended solids of the wastewater to be treated in a biological sorption tank to produce a first mixed liquor;
- producing a solids-rich sludge and a solids-lean portion from the first mixed liquor;
- anaerobically digesting a first portion of the solids-rich sludge to produce an anaerobically digested sludge;
- and
- combining at least a portion of the anaerobically digested sludge with the wastewater to be treated,
- wherein anaerobically digesting the first portion of the solids-rich sludge comprises removing a majority of chemical oxygen demand (COD) present in the wastewater to be treated.
4 more elements
A process for treating wastewater comprising:
- providing a wastewater stream to be treated;
- introducing the wastewater stream into a biological sorption tank configured to aggregate at least a portion of dissolved and suspended solids of the wastewater stream to produce a first mixed liquor stream;
- introducing the first mixed liquor stream into a separator to produce a solids-rich stream and a solids-lean stream;
- introducing at least a portion of the solids-rich stream into an anaerobic digester to produce an anaerobically digested sludge stream;
- and
- introducing at least a portion of the anaerobically digested sludge stream into the biological sorption tank,
- wherein producing the anaerobically digested sludge stream comprises removing a majority of chemical oxygen demand (COD) present in the wastewater to be treated in the anaerobic digester.
4 more elements
A wastewater treatment system comprising:
- a source of a wastewater to be treated;
- a biological sorption tank configured to aggregate at least a portion of dissolved and suspended solids of the wastewater to be treated and having a sorption tank inlet fluidly connected to the source of the wastewater;
- a separator having a separator inlet fluidly connected downstream from the biological sorption tank, a sludge outlet, and a solids-lean outlet;
- and
- an anaerobic digester having a digester inlet fluidly connected downstream from the sludge outlet, and a digested sludge outlet fluidly connected upstream of the sorption tank inlet,
- wherein the anaerobic digester is configured to remove a majority of chemical oxygen demand (COD) present in the wastewater to be treated.
3 more elements
Dependencies are inferred from the claim text.