The invention concerns a device (100) for neutralization of manure that is kept in a manure tank, where the device comprises:a housing (2), where the housing comprises a flow channel (4), where the flow channel comprises an inlet (6) and an outlet (8), the flow channel thereby defining a flow process for liquids and/or slurries in a direction from the inlet to the outletwhere the device comprises a propeller (10), the propeller being arranged in the flow channel between the inlet and the outletwhere the device comprises means (12) of placing the propeller in rotating motion where the device comprises a nozzle (14), the nozzle being arranged in the flow channel downstream from the propeller and upstream from the outletwhere the device comprises two or more baffles (16), the baffles being arranged in the nozzle in an orientation that essentially corresponds to the flow processwhere the device furthermore comprises an acid adding inlet (18), this acid adding inlet being in fluidic connection with the flow channel.
