TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: A partial quantity of the water is removed by cooling from the purified biogas (biomethane) before feeding to the adsorber. The layer of silica gel is made up of two layers including a lower macroporous and an upper mesoporous layer in a ratio from lower to upper layer of 1:1-1:4. The biomethane used for regeneration with a temperature of 110-150 degrees C is conducted through the filling. The temperature of the emerging biomethane is continuously measured and the supply of biomethane is shut down after an increase in outlet temperature to 40-50 degrees C. The biogas to be dried at pressure-free condition or with less pressure of up to 1 bar is pumped through the adsorber. The volume ratio of first layer (silica gel) to second layer (molecular sieves) is 20:1-3:1. The adsorption duration is 12-14 hours and the water content in the dried biomethane is reduced to less than 20 mg/Nm3. The regenerated adsorbents are cooled up to 10-30 degrees C before reusing with cooled biomethane (temperature 5-15 degrees C). At least the lower portion of the adsorber is heated indirectly during regeneration. The regeneration of the loaded adsorber is carried out at low pressure. EXAMPLE - Biogas produced from organic waste material in a fermentor was cleaned of undesired minor components, which contained carbon dioxide using a pressureless amine wash removes. A purified biogas was deducted from the washing column, preferably biomethane (comprising methane (95.2 vol.%), carbon dioxide (0.5 vol.%), water (4 vol.%), oxygen (0.1 vol.%), nitrogen (0.2 vol.%), hydrogen sulfide (2 ppm) and ammonia (1 ppm)) at a temperature of 38 degrees C and 30 Nm3/hour. The biomethane deducted via the first pipeline (1) was led into a first heat exchanger at 22 degrees C and then via the second pipeline (2) to the downstream, and was cooled to 5 degrees C in the second heat exchanger. Then the water content of the biomethane was initially reduced to 19500 mg/Nm3 up to 5035 mg/Nm3. Then the separated water was discharged into a container, optionally stored and fed back to the biogas production or -cleaning. The biomethane was dried using two identical adsorbers including first adsorber (A1) and the second adsorber (A2) with a bulk height of 700 mm and a diameter of 300 mm and were subjected to loading after regeneration. Then the regeneration was carried out by discharging the dried biomethane after incorporating a closable branch line after the compressor (V1) via the 5 m3/hour of dried biomethane to be separated out. This partial stream was passed through a third heat exchanger and heated to a temperature of 120 degrees C and passed through pipeline to regenerate the adsorber.