A method for thermal treatment of organic matter (x) of a low calorific value, in which method matter to be processed is brought by a feed arrangement (1) to a conveyor arrangement (3) connected to a process space (2) that is substantially of a Thompson Converter type, the matter to be processed being made to move in the process space (2) in a longitudinal direction (s) thereof by means of a conveyor arrangement (3) closed in relation to the space, whereby pyrolysis gas (y) formed by heat transfer from the process space into the matter to be processed contained in the conveyor system is conveyed into a combustion space (4) provided in the process space for combustion of the gas, flue gas (y') thereby formed being discharged from the process space by means of a discharge arrangement (5), and thermally treated matter (x') is discharged from the conveyor arrangement for further processing. For improving the calorific value of the matter to be processed, matter of a low calorific value (x) is fed into the process space (2) by the conveyor arrangement (3) together with at least one organic matter (w) of a better calorific value.
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