Biological solids processing
AssigneeSchwing Bioset, Inc.
InventorsThomas M. Anderson, Charles M. Wanstrom, Lakshminarasimha Krishnapura
Life of this patent
Estimating the term…
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.
Claims19
A process for treating pathogen-containing sludge of biological solids, the process comprising:
- blending a sludge with an alkaline product;
- delivering the sludge and the alkaline product to a pressurized container;
- injecting, into the pressurized container, a gaseous or liquid additive;
- mixing the additive with the sludge and the alkaline product;
- delivering the sludge, the alkaline product, and the additive into a temperature and pressure controlled reactor;
- regulating pH and temperature in the reactor from an exothermic reaction produced by the sludge, the alkaline product, and the additive to reduce pathogens in the sludge, creating a reacted sludge;
- removing ammonia from the reacted sludge with a vapor and odor recovery mechanism and a water scrubber;
- and
- delivering the sludge to a recovery station to recover end products from the system.
A system for treating pathogen-containing sludge of biological solids, the system comprising:
- a first delivery mechanism that mixes the sludge and an alkaline product;
- a pressurized container that receives and temporarily holds the sludge and the alkaline product;
- an injector that injects an additive into the pressurized container with the sludge and the alkaline product;
- a temperature and pressure controlled reactor in which the alkaline product and the additive produce an exothermic reaction that reduces pathogens within the sludge;
- and
- a vapor and odor recovery mechanism that removes ammonia containing vapor from the sludge.
A system for treating pathogen-containing sludge of biological solids, the system comprising:
- a first delivery mechanism that receives and mixes the sludge, an alkaline product, and an acid, wherein the first delivery mechanism is enclosed;
- a pressurized container that receives and temporarily holds the sludge, the alkaline product, and the acid;
- an injector that injects a liquid or gaseous additive into the pressurized container;
- a mixing mechanism in the pressurized container to combine the additive with the sludge, the alkaline product, and the acid;
- a second delivery method to move the sludge, the alkaline product, the acid, and the additive through the system;
- a temperature and pressure controlled reactor in which the alkaline product, the additive, and the sludge produce an exothermic and pH altering reaction that reduces pathogens within the sludge;
- a vapor and odor recovery mechanism to remove ammonia containing vapors from the pathogen-reduced sludge;
- a water scrubber that scrubs and collects ammonia-containing products from the pathogen reduced sludge and the ammonia containing vapors;
- and
- a recovery station to recover end products from the system.
Dependencies are inferred from the claim text.