System for batch processing organic waste by pyrolysing said organic waste into pyrolysed material and gasified material, said system comprising: - a frame; - a conical housing mounted on the frame and configured to substantially hermetically enclose said waste for a predefined residence time, which housing has a longitudinal direction, a side wall, an upper side and an underside and is provided with: - an inlet configured to communicate with a supply device to introduce said waste into the housing, the inlet being provided with closing means configured to close the inlet during the waste processing; - an outlet configured to communicate with a discharge device for discharging said pyrolysed material from the housing, which outlet is provided on the underside of the housing and with closing means configured to close the outlet during the waste processing; and - a gas outlet configured to communicate with a gas discharge device for discharging said gasified material from the housing during the waste processing, a cross-section through the conical housing having a surface which substantially perpendicular to said longitudinal direction decreases downwards; and - a mixing device mounted on the frame and provided with: - a drive shaft rotatably mounted relative to the housing, said drive shaft extending through the upper side of the housing along said longitudinal direction with a first portion located inside the housing and a second portion located outside the housing; and - a conical mixing body inside the housing and configured to fluidise said waste, which mixing body is fixedly attached to the first portion of the drive shaft and substantially does not touch the housing; and - heating means for heating the side wall of the housing. - a frame; - a conical housing mounted on the frame and configured to substantially hermetically enclose said waste for a predefined residence time, which housing has a longitudinal direction, a side wall, an upper side and an underside and is provided with: - an inlet configured to communicate with a supply device to introduce said waste into the housing, the inlet being provided with closing means configured to close the inlet during the waste processing; - an outlet configured to communicate with a discharge device for discharging said pyrolysed material from the housing, which outlet is provided on the underside of the housing and with closing means configured to close the outlet during the waste processing; and - a gas outlet configured to communicate with a gas discharge device for discharging said gasified material from the housing during the waste processing, a cross-section through the conical housing having a surface which substantially perpendicular to said longitudinal direction decreases downwards; and - an inlet configured to communicate with a supply device to introduce said waste into the housing, the inlet being provided with closing means configured to close the inlet during the waste processing; - an outlet configured to communicate with a discharge device for discharging said pyrolysed material from the housing, which outlet is provided on the underside of the housing and with closing means configured to close the outlet during the waste processing; and - a gas outlet configured to communicate with a gas discharge device for discharging said gasified material from the housing during the waste processing, a cross-section through the conical housing having a surface which substantially perpendicular to said longitudinal direction decreases downwards; and - a mixing device mounted on the frame and provided with: - a drive shaft rotatably mounted relative to the housing, said drive shaft extending through the upper side of the housing along said longitudinal direction with a first portion located inside the housing and a second portion located outside the housing; and - a conical mixing body inside the housing and configured to fluidise said waste, which mixing body is fixedly attached to the first portion of the drive shaft and substantially does not touch the housing; and - heating means for heating the side wall of the housing. - a drive shaft rotatably mounted relative to the housing, said drive shaft extending through the upper side of the housing along said longitudinal direction with a first portion located inside the housing and a second portion located outside the housing; and - a conical mixing body inside the housing and configured to fluidise said waste, which mixing body is fixedly attached to the first portion of the drive shaft and substantially does not touch the housing; and - heating means for heating the side wall of the housing.