Biological solids processing
AssigneeSchwing Bioset, Inc.
InventorsThomas M. Anderson, Charles M. Wanstrom, Lakshminarasimha Krishnapura
Life of this patent
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Abstract
A method of processing biological solids includes blending a sludge with calcium oxide and delivering the blended sludge and calcium oxide to a pressurized container; injecting, into the blended sludge and calcium oxide in the pressurized container, an additive capable of exothermic reactions with the calcium oxide; regulating pH in the pressurized container to produce class A biological solids from the sludge; and pumping the blended sludge, calcium oxide, and additive from the pressurized container to a reactor. A system used for this process include sources of calcium oxide and biological solids, an additive injector, and a pressurized reactor.
Claims17
A process for treating pathogen-containing sludge of biological solids comprises:
- blending a sludge with calcium oxide and delivering the blended sludge and calcium oxide to a pressurized container;
- injecting, into the blended sludge and calcium oxide in the pressurized container, a gaseous additive capable of exothermic reactions with the calcium oxide;
- regulating pH in the pressurized container to produce class A biological solids from the sludge;
- and
- pumping the blended sludge, calcium oxide, and additive from the pressurized container to a reactor.
A system for treating pathogen containing sludge of biological solids comprising:
- a storage container configured to hold calcium oxide;
- a biological solids conveyer configured to move biological solids;
- an acid container configured to hold acid;
- a twin-screw mixer configured to mix the calcium oxide, the biological solids, and the acid into a sludge;
- a piston pump fluidly connected to the twin-screw mixer, the piston pump configured to move the sludge;
- a reactor connected to the piston pump and configured to the sludge;
- an injector configured to inject a gaseous additive capable of exothermic reactions with the calcium oxide into the system upstream of the reactor;
- and
- a recovery system configured to receive and process the sludge.
(canceled)
Dependencies are inferred from the claim text.