# US 11,111,824 B2 · Multi-functional fecal waste and garbage processor and associated methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,824 B2 - Document ID: US11111824B2 - Status: Granted - Kind: B2 - Application number: 16/361,115 - Filed: 2019-03-21 - Published: 2019-10-17 - Granted: 2021-09-07 - Earliest claimed: 2014-11-14 - Assignees: Bill & Melinda Gates Foundation - Applicants: Bill & Melinda Gates Foundation - Inventors: Peter Janicki - Web page: https://patentgrep.com/patent/US11111824B2 ## CPC - F01K 25/04: the fluid being in different phases, e.g. foamed - B01D 1/04: Evaporators with horizontal tubes - B01D 1/226: {in the form of a screw or with helical blade members} - C02F 1/004: {using large scale industrial sized filters} - C02F 9/00: Multistage treatment of water, waste water or sewage - F01K 17/04: for specific purposes other than heating (F01K17/06 takes precedence) - F01K 17/06: Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant - F22B 31/0007: {with combustion in a fluidized bed} - F23G 5/04: drying - F23G 5/30: having a fluidised bed - F23G 5/40: Portable or mobile incinerators - F23K 1/04: Heating fuel prior to delivery to combustion apparatus - C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)} - C02F 1/04: by distillation or evaporation - C02F 1/20: by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) - C02F 1/283: {using coal, charred products, or inorganic mixtures containing them} - C02F 1/444: {by ultrafiltration or microfiltration} - C02F 11/06: by oxidation (incinerators for burning waste liquors, e.g. sulfite liquor from paper-making plant F23G7/04) - C02F 11/12: by de-watering, drying or thickening - C02F 11/13: by heating - C02F 2303/06: Sludge reduction, e.g. by lysis - C02F 2303/10: Energy recovery - F23K 2201/20: Drying - Y02E 20/12: Heat utilisation in combustion or incineration of waste - Y02E 50/10: Biofuels, e.g. bio-diesel - Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel - Y02W 10/30: Wastewater or sewage treatment systems using renewable energies - Y02W 10/40: Valorisation of by-products of wastewater, sewage or sludge processing - F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - F22B: METHODS OF STEAM GENERATION; STEAM BOILERS - F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION - F23K: FEEDING FUEL TO COMBUSTION APPARATUS (fuel feeders specially adapted for fluidised bed combustion apparatus F23C10/22) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract At least one aspect of the technology provides a self-contained processing facility configured to convert organic, high water-content waste, such as fecal sludge and garbage, into electricity while also generating and collecting potable water. ## Claims ### Claim 1 A method of processing wet sludge with a multifunctional waste processing system for electricity and clean generation, comprising: directing a flow of wet organic-based sludge to an inlet of a fuel path of a fuel dryer assembly, wherein the sludge comprises a mixture of water and solid fuel material, directing the flow of sludge along the fuel path through a heater portion of the fuel dryer assembly and boiling the wet fecal sludge and thermally separating the water from the solid fuel material to provide dried fuel, the fuel dryer having a first steam outlet, a dry fuel outlet; condensing in a condenser steam liberated from the wet fecal sludge, wherein the condenser has a fresh water condenser assembly coupled to the first steam outlet and configured to condense the steam liberated from the wet fecal sludge for use as potable water; receiving in a dry fuel combustor assembly dried fuel the dry fuel outlet of the fuel dryer assembly, the dry fuel combustor assembly having a combustor portion and having a boiler configured to receive heat from the combustor portion, the boiler having a water inlet and a second steam outlet; directing steam from the boiler to a steam inlet of a fluid path of a condenser portion of the fuel dryer assembly, wherein the fluid path through the condenser is isolated from the fuel path and has a fluid outlet; combusting the dried fuel in the combustor portion to generate heat that boils water in the boiler to generate steam; generating electricity with a steam powered generator via the steam received from the second steam outlet of the boiler, the steam powered generator having a third steam outlet coupled to the steam inlet of the condenser portion; directing the condensed steam from the fresh water condenser assembly through a water treatment system that receives the condensed steam in either vapor phase or liquid phase or both, wherein the condensed steam as liquid water is passed through a purifier and filter to provide the potable water; and pumping with a water pump a flow of water from the fluid outlet of the condenser portion of the fuel dryer; wherein the flow of water is pumped from a water outlet of the water pump to the water inlet of the boiler; wherein the boiler converts a flow of water entering the boiler to a flow of steam to power the steam-powered generator. ### Claim 2 (depends on 1) The method of claim 1, further comprising moving and heating the sludge in the fuel dryer with a steam heated auger in the fuel carrier during the drying process. ### Claim 3 (depends on 1) The method of claim 1 wherein the fuel dryer is a two-stage dryer having sequential first and second dryer stages each coupled to the condenser portion and the sludge in each of the first and second dryer stages is dried by evaporating water from the fecal sludge using heat from exhaust steam from the steam-powered generator. ### Claim 4 (depends on 3) The method of claim 3, further comprising generating with the first dryer stage sludge steam from the fecal sludge, and using in the second dryer stage the sludge steam from the first dryer stage to dry the sludge. ### Claim 5 (depends on 3) The method of claim 3 wherein the first dryer stage generates first dryer steam from water evaporation from the fecal sludge, and the second dryer stage has a first steam carrier portion coupled to the first dryer stage and the first steam carrier portion carries the first dryer steam adjacent to the fecal sludge, and the second dryer stage has a second steam carrier portion isolated from the first steam carrier portion and the second steam carrier portion carries the exhaust steam from the steam-powered generator adjacent to the fecal sludge, wherein heat from the first and second steam carrier portions dries the fecal sludge moving therein. ### Claim 6 (depends on 1) The method of claim 1, further comprising receiving in the condenser portion of the fuel dryer assembly exhaust steam from the steam-powered generator, and the fuel dryer has a first dryer stage connected to the fuel inlet and has a first heater portion coupled to the condenser and the first heater portion evaporates a first portion of the water from the fecal sludge with heat from the exhaust steam, and a second dryer stage is connected to the first dryer stage and the second dryer stage evaporates a second portion of the water from thickened fecal sludge received from the first dryer stage with heat from the exhaust steam. ### Claim 7 (depends on 1) The method of claim 1 wherein the condenser of the fuel dryer assembly receives exhaust steam from the steam powered generator through the first steam inlet, and the fuel dryer assembly having a single stage dryer portion connected to the fuel inlet and adjacent to the condenser portion, the single stage dryer portion evaporates water from the fecal sludge using the heat from the exhaust steam in the condenser. ### Claim 8 (depends on 1) The method of claim 1 wherein the combustor portion is a fluidized bed combustor assembly. ### Claim 9 (depends on 1) The method of claim 1 wherein generating electricity includes generating electricity with a single action, liquid cooled steam engine.