US 12,391,594 B2
Method and slurry treatment plant for reducing methane emission from slurry produced in a livestock farm
Jesper Ahrenfeldt, Kongens Lyngby (DK); Ulrik Birk Henriksen, Kongens Lyngby (DK); Rasmus Østergaard Gadsbøll, Kongens Lyngby (DK); and Tobias Pape Thomsen, Ringsted (DK)
Assigned to Stiesdal SkyClean A/S, Give (DK)
Appl. No. 18/010,704
Filed by Stiesdal SkyClean A/S, Give (DK)
PCT Filed Jun. 23, 2021, PCT No. PCT/DK2021/050201
§ 371(c)(1), (2) Date Dec. 15, 2022,
PCT Pub. No. WO2021/259435, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 20181605 (EP), filed on Jun. 23, 2020.
Prior Publication US 2023/0234873 A1, Jul. 27, 2023
Int. Cl. C02F 11/10 (2006.01); C02F 11/13 (2019.01); C05F 3/00 (2006.01); C02F 103/20 (2006.01)
CPC C02F 11/10 (2013.01) [C02F 11/13 (2019.01); C05F 3/00 (2013.01); C02F 2103/20 (2013.01); C02F 2209/02 (2013.01); C02F 2301/046 (2013.01); C02F 2303/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for reducing methane emission from slurry produced in a livestock farm, said method comprising the steps of:
providing at least partially dewatered slurry by guiding said slurry from said livestock farm to a dewatering unit in which said slurry is at least partially dewatered by extracting a watery fraction of said slurry,
guiding said at least partially dewatered slurry from said dewatering unit to a steam dryer,
providing dried slurry by drying said at least partially dewatered slurry in said steam dryer,
guiding said dried slurry into a pyrolysis reactor to produce pyrolysis gas and biochar through a pyrolysis process in said pyrolysis reactor,
guiding at least a portion of said pyrolysis gas to a combustion unit in which said at least portion of said pyrolysis gas is combusted to produce a combusted pyrolysis gas and raise the temperature of said combusted pyrolysis gas,
guiding said combusted pyrolysis gas to said pyrolysis reactor to drive said pyrolysis process,
guiding said combusted pyrolysis gas from said pyrolysis reactor to said steam dryer to increase a temperature of steam in said steam dryer, and
transporting said extracted watery fraction of said slurry to a slurry heating system and heating said extracted watery fraction of said slurry in the slurry heating system to a temperature of above 75° Celsius by means of steam from said steam dryer in the step of drying said at least partially dewatered slurry in said steam dryer.