Biogat
Purification of sulfurous exhaust air streams
The BIOGAT process is particularly well suited to treat waste gases with a low concentration of H2S and CS2 in various branches of industry.
The process
In the BIOGAT process, H2S and CS2 are converted to diluted sulfuric acid and biomass. The decomposition of CO2 and H2S is catalyzed by a selective population of microorganisms which accumulate on the carrier layers (saddle packing).
Crude gas (1) loaded with contaminated substances streams through a bio-trickling filter (BTF) co-current to the circuit water. In the BTF microorganisms are immobilized at several levels in carrier layers. The waste gases enter into contact with the biomass which is at the same time sprayed with the circuit medium (3).
The oxidation of the sulfurous substances in the crude gas is catalyzed by the biomass and leads to these being converted into nontoxic end products. In this process, carbon disulfide is hydrolyzed in two steps to hydrogen sulfide and CO2 and the accumulated H2S is oxidized biologically to sulfuric acid and CO2.
The spray application provides the microorganisms with nutrient salt which is then fed to the circuit water in small quantities, as needed.
The circuit water cleans the biological decomposition products out of the packed layers and these are then disposed off via the overflow. The clean gas (2) is discharged via a chimney.
Advantages
- Highest possible H2S and CS2 degradation
- Modular plant design
- Excellent plant availability
- Highest process stability
- Low operating costs
- Reduced quantities of waste water
- Almost completely maintenance-free
Applications
- Viscose processing industry
- Sulfur processing industry
- Fertilizer industry
- Biogas plants
- Waste water purifi cation plants
