# US 2014/0360093 A1 · Procedure and equipment for the production of solid fuel from wastewater sludge

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- Number: US 2014/0360093 A1
- Document ID: US20140360093A1
- Status: Published application
- Kind: A1
- Application number: 14/236,653
- Filed: 2012-07-31
- Published: 2014-12-11
- Earliest claimed: 2011-08-01
- Inventors: Istvan Vereckey; ifj. Istvan Vereckey; Bela Bognar; Laszlo Ercsey
- Web page: https://patentgrep.com/patent/US20140360093A1

## CPC

- C02F 11/13: by heating
- C02F 11/121: by mechanical de-watering
- C10L 5/08: without the aid of extraneous binders
- C10L 5/28: Heating the {shaped fuels, e.g.} briquettes; Coking the binders
- C10L 5/363: {Pellets or granulates}
- C10L 5/46: on sewage, house, or town refuse {(C10L5/403, C10L5/406 take precedence)}
- C10L 5/48: on industrial residues and waste materials {(C10L5/403, C10L5/406 take precedence)}
- C02F 11/122: using filter presses (C02F11/123 takes precedence)
- C02F 11/127: by centrifugation
- Y02E 50/10: Biofuels, e.g. bio-diesel
- Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel
- 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)
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Process for the production of solid fuel from wastewater sludge, and equipment suitable for carrying out the production thereof.

## Claims

### Claim 1

Procedure for the production of solid fuel from wastewater sludge, during which the wastewater sludge containing 2-8% dry material is first subjected to mechanical water removal, during which the absorption water is removed and we produce wastewater sludge with a dry material content of at least 25-30%, the significant proportion of the remaining capillary water, favourably at least half of it, is removed by an accelerated evaporation process, drying, characterised by that we pre-dry the wastewater sludge containing at least 25-30% dry material using the heat of the flue gas of the burning equipment operated by us to a dry material content of 50-55%, we extract the steam created and gases released during pre-drying, filtering them if necessary and utilise them by returning them to the burning equipment, we pelletize the wastewater sludge containing 50-55% dry material at a high pressure of, favourably, 800-900 bar, then we perform final drying of the pellet product created in this way to a dry material content of at least 80-85% by making further use of the heat of the flue gas of the burning equipment operated by us, we use a part of the solid pellet final product, favourably at least 30-50% of it as fuel in the burning equipment operated by us.

### Claim 2 (depends on 1)

Procedure according to claim 1, characterised by that in the burning equipment operated by us we maintain the input temperature of the air feeding the burning at around the temperature of the combustion chamber of the burning equipment.

### Claim 3 (depends on 1)

Procedure according to claim 1, characterised by that we also use the heat of the flue gas of the burning equipment for producing energy.

### Claim 4 (depends on 1)

Procedure according to claim 1, characterised by that a further part of the solid pellet final product, advantageously 70-50%, is cooled, then packaged.

### Claim 5

Equipment for the production of solid fuel from wastewater sludge, which is connected to a mechanical dehydration unit for the feeding of the wastewater sludge, the output of this is connected to a final dryer through a pre-dryer and pelletizer extruder, furthermore it contains burning equipment connected to the pre-dryer and final dryer, characterised by that the pre-dryer (3) is a double- walled drum (30), and there is a spiral-shaped mixing blade (31) fixed inside this drum (30), the final dryer (5) is fitted with stainless steel bands, and the flue gas output (61) of the burning equipment (6) runs between the steel bands via a heat exchanger (62), the forced-flow air extraction (50) of the final dryer (5) is connected to the input (34) between the two walls (32,33) of the double-walled drum (30) of the pre-dryer (3), the suction connector (35) of the drum (30) is connected with the combustion chamber (63) of the burning equipment (6), favourably through a filter (64), furthermore, the output (51) of the final dryer (5) at the end of the steel bands is connected to the burning equipment (6) through the fuel feeder (65).

### Claim 6 (depends on 5)

Equipment according to claim 5, characterised by that the outside wall of the burning equipment (6) is fitted with heat insulation and a space(s) that raises the temperature of the gases feeding combustion is(are) formed in the wall and which is(are) connected to the combustion chamber (63) of the burning equipment (6).

### Claim 7 (depends on 5)

Equipment according to claim 5, characterised by that it has a cooler unit (7) connected to the final dryer (5) and also includes a packaging unit (8).

### Claim 8 (depends on 1)

Equipment according to claim 1, characterised by that it is placed in a container(s).