The bio-bed reactor plant is inoculated with the selected micro-organisms which are immobilised on the filling material. The reactor is delivered and assembled together with a container made of polypropylene with a flat bottom and a cone roof. A grate made of synthetic material is integrated into the container. The filling material is inside of it. The micro-organism suspension is pumped into the circulation and the H₂S dissolved into it.

Micro-organisms of the Thiobacillus (Thiooxidans) type are used. These bacteria are chemolithotrophs and use carbon dioxide as their carbon source. Oxygen in the form of air is needed for their metabolism. The air addition is regulated over flow of biogas volume stream. A signal (4...20 mA) of the biogas volume stream is required. Air is provided by a fan, which is controlled with a frequency converter. The container is  made in PP. The heating is not necessary. All pipes are made of PVC or PP (due to the low pH value of the suspension). The switchboard and the complete technology are installed in a room made of PP which is fixed to the container. A secure ATEX-shutdown is installed on a second switchboard outside the technology room. The pipes for the gas are DN=200 in size for each pipe.

The advantages of biological desulphurisation plants against other processes such as activated carbon filters or chemical washers are that there is no extra use of chemicals. Sulphur removal is 94% from 2500 ppm to 150 ppm.