NOVELTY - Regenerating an adsorbent loaded with sulfur or a sulfur-containing compound as adsorbate, comprises (a) providing the loaded adsorbent, (b) contacting the loaded adsorbent with at least one sulfur or sulfide-oxidizing microorganism, where the microorganism is present in pure culture or in mixed culture, (c) regenerating the loaded adsorbent by oxidizing the sulfur or sulfur-containing compound by the microorganism.    USE - The device is useful for biological desulfurization of a loaded adsorbent for biogas cleaning (claimed).    ADVANTAGE - The method: regenerates sulfur-containing adsorbents in cost-efficient manner; transforms pollutants into inorganic components; and is environmentally friendly.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) use of sulfur-oxidizing or sulfide-reducing microorganism in the above method; and    (2) a device for regenerating the adsorbent loaded with sulfur and/or a sulfur-containing compound as adsorbate, comprising a sealable container (1), in which an open filing device (4) is detachably mounted, where a device for dosing and/or discharging liquid and/or nutrient solutions is attached to the container, and a device for dosing and/or discharging gases is attached to the container, which is a ventilation tube optionally comprising an inlet valve (10) and/or an outlet valve (11). The ventilation tube is optionally designed as membrane gassing module. The container comprises at least one measuring- and controlling element for measuring values required for culturing micro-organisms, where measuring element is designed as measuring electrode for measuring pH, conductivity of the medium within the container, oxygen concentration, sulfate concentration, and/or temperature, and optionally a sampling point (14) is attached to the container.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the device. (Drawing includes non-English language text).    Container (1)    Filing device (4)    Inlet valve (10)    Outlet valve (11)    Sampling point (14)