Abrégé

Disclosed is a method for reducing methane emission from slurry produced in a livestock farm. The method comprising the steps of guiding unheated slurry from the livestock farm to a slurry heat exchanger, raising the temperature of the unheated slurry in the slurry heat exchanger to at least 65# Celsius, guiding the at least 65# Celsius hot slurry to an intermediate slurry tank, raising the temperature of the heated slurry to at least 75# Celsius in the intermediate slurry tank, guiding the at least 75# Celsius hot slurry through the slurry heat exchanger to exchange heat with the unheated slurry to raise the temperature of the unheated slurry to the at least 65# Celsius and to cool the at least 75# Celsius hot slurry to at least below 40# Celsius, and guiding the at least below 40# Celsius cold slurry to a slurry reservoir. Furthermore, a slurry treatment plant for reducing methane emission from slurry is disclosed.

Classes IPC  ?

• C05F 3/06 - Appareillage pour leur fabrication
• C02F 11/18 - Traitement des boues d'égout; Dispositifs à cet effet par conditionnement thermique
• C05F 17/957 - Emploi d’au moins deux dispositifs distincts disposés en série
• C05F 17/40 - Traitement des liquides ou des boues
• C05F 17/986 - Appareillages à cet effet Éléments de structure, p.ex. planchers, couvercles ou portes pour l'alimentation ou l'évacuation des autres matières les autres matières étant à l’état liquide
• A01C 3/02 - Installations pour l'emmagasinage des engrais de ferme, p.ex. citernes pour purin; Installations pour la fermentation des engrais de ferme
• C05F 17/60 - Chauffage ou refroidissement pendant le traitement
• C05F 17/80 - Séparation ou élimination des substances nuisibles résultant du traitement

Abrégé

Disclosed is a method for reducing methane emission from slurry (2) produced in a livestock farm (1). The method comprises the steps of guiding the slurry (2) from the livestock farm (1) to a dewatering unit (12) in which the slurry (2) is at least partially dewatered by extracting a watery fraction of said slurry (13), guiding the slurry from the dewatering unit (12) to a steam dryer (3), drying the slurry in the steam dryer (3), guiding the dried slurry (4) into a pyrolysis reactor (5) to produce pyrolysis gas (6) and biochar (7) through a pyrolysis process in the pyrolysis reactor (5), guiding at least a portion of the pyrolysis gas (6) to a combustion unit (8) in which the pyrolysis gas portion is combusted to raise the temperature of the combusted pyrolysis gas (9), guiding the combusted pyrolysis gas (9) to the pyrolysis reactor (5) to drive the pyrolysis process, guiding the combusted pyrolysis gas (9) from the pyrolysis reactor (5) to the steam dryer (3) to increase the temperature of steam (10) in the steam dryer (3), and heating the watery fraction of the slurry 13 to a temperature at least above 75° Celsius by means of the steam (10) from said steam dryer (3). Furthermore, a slurry treatment plant (20) for reducing methane emission from slurry (2) is disclosed.

Classes IPC  ?

• C02F 11/10 - Traitement des boues d'égout; Dispositifs à cet effet par pyrolyse
• C02F 11/13 - Traitement des boues d'égout; Dispositifs à cet effet par déshydratation, séchage ou épaississement par chauffage
• C05F 3/00 - Engrais fabriqués à partir des excréments humains ou animaux, y compris le fumier