Treatment of waste products with anaerobic digestion
AssigneeAnaergia Inc.
InventorsJuan Carlos JOSSE, Andrew BENEDEK
Life of this patent
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Abstract
A waste stream is treated by anaerobic digestion. A process is described involves a step of separating solids from digestate, and returning separated solids to a digester. Optionally, there may be a step of solids separation in which larger solids are removed from the digester. A process and apparatus are described for treating waste sludge from a wastewater treatment plant in an anaerobic digester. Feed sludge is thickened or solids are separated from digestate and returned to the digester. Additional co-digestion waste may be added to the digester. The process and apparatus may be used in a retrofit of an existing wastewater treatment plant.
Claims11
A process for treating waste sludge from a wastewater treatment plant comprising the steps of,
- a) flowing the waste sludge to an existing anaerobic digester of the wastewater treatment plant;
- and,
- b) recuperative thickening digestate in the digester,
- wherein digestate in the digester is maintained at a solids content of 5% or more.
A process for treating WWTP sludge comprising the steps of,
- feeding the WWTP sludge at 4% TS or less to an anaerobic digester;
- operating the anaerobic digester at 5 to 6% TS;
- and,
- providing recuperative thickening for the digester by way of a side stream thickener;
- and,
- adding a polymeric thickening aid in the side stream.
Dependencies are inferred from the claim text.