TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The portion of produced gas is recycled towards the drying enclosure, which is extracted after the conversion step of the CO to the steam. The process further comprises treatment of produced gas comprising washing, carried out after the gasification step and before the conversion of the CO to the steam, where the portion of the produced gas is recycled towards the drying enclosure, which is collected after the treatment and before the conversion of the CO to the steam. The portion of produced gas recycled towards the enclosure, is 10-30 vol.% of the gas flowing in the treatment chain at the extraction point of the recycled gas part. The drying gas filled with water after it passes through the drying enclosure, is recycled in the treatment chain after the gasification step and before the conversion step of the CO to the steam for feeding water, in whole or in part, the reactor for conversion of CO to the steam. The process further comprises a treatment step of the gas, carried out after the gasification step and before the conversion step of the CO to the steam, where the treatment step comprises at least one heat exchange step and dust extraction step, and the drying gas, filled with water after passing in the drying enclosure is recycled in the treatment chain before the dust extraction step or heat exchange step. The means of extraction are located downstream of the conversion step of CO to the steam. The chain of the treatment further comprises: a device for gas treatment located downstream of the gasification device and upstream of the reactor for conversion of the CO to the steam, where the means for extracting are located downstream of the treatment device and upstream of the conversion step of the CO to the steam; and a treatment gas, comprising at least one heat exchanger and a dust extraction device, located downstream of the gasification device and upstream of the reactor, in which means of recycling joins the treatment chain upstream of the dust extraction device or the heat exchanger. The chain of treatment comprises means for recycling the drying gas, filled with water after its passage through the drying enclosure, in the chain of treatment downstream of the gasification device and upstream of the reactor for converting CO to the steam for feeding the reactor entirely or partly in water. In the chain of treatment, the means for releasing pressure is a compressor. The drying enclosure is the fluidized bed and comprises additional means for heating of the hot drying gas. The means for heating the hot drying gas are placed in the drying enclosure. The gasification device is the bubbling or circulating fluidized bed and comprises means for recycling of hot particles of cyclone to the drying enclosure. The conversion process is implemented by the chain of the treatment. Preferred Components: The biological material has a water content of greater than or equal to 10 wt.% of the dry material. The rate of dehydration of the charge is 70-99 wt.%, preferably 90-95 wt.%, at the end of the pretreatment. The hot gas for drying introduced into the drying enclosure has a temperature of 200-400 degrees C. The device for gasification is allothermic combustion. EXAMPLE - No suitable example given.