Treatment of waste products with anaerobic digestion
AssigneeAnaergia Inc.
InventorJuan Carlos Josse
Life of this patent
Estimating the term…
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.
Claims10
A process for treating WWTP sludge comprising the steps of,
- feeding the WWTP sludge at 12-20% TS to an anaerobic digester;
- operating the anaerobic digester at 6-12% TS without recuperative thickening;
- and,
- dewatering digestate in two stages.
A process for treating WWTP sludge comprising the steps of, feeding the WWTP sludge at 1-5% TS to an anaerobic digester;
- operating the anaerobic digester at 4-6% 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,
- wherein the polymeric thickening aid is added at 3 kg/MT-TSS or less.
Dependencies are inferred from the claim text.