Biogas coming out of anaerobic digesters is used as boiler fuel. However there is a good potential to harness electrical energy from this using Biogas Engines. The biggest challenge is the removal of Hydrogen Sulfide from this gas for it to be used in these engines. The Biochemical / Hybrid technologies are the way ahead. This technology overcomes the shortcomings of the existing processes and brings to the table a very innovative way to treat the Biogas.
- Poultry farms
- Pulp and Paper plants etc.
Feature and Advantages
The sugar based distillery has very high H2S content in the Biogas going as high as 3.5-4% in the feed. The Biochemical process has been used to remove the Sulfur, but the caustic consumption and the power cost of this plant is very high. Where aerobic digestate is available we offer the Hybrid technology which uses a two stage process by way of which 90% of the Caustic used is recovered back, and the final purified gas has no variation in parameters.
In biogas the acid gas can cause corrosion of i.e. piping and engines, preventing gas utilization without pre‐treatment.
Until a few years ago, the only possibility to treat these gases was using Chemical scrubbers or alternate technologies,which were either very costly on operating costs or were not eco‐friendly. With the environmental pressures mounting, a need to develop newer greener technologies was felt which would meet the environmental demands and were costeffective.
Until recent the removal of H2S is usually done by a chemical system due to the ultra high concentrations of H2S (up to 5%v/v). This leads to acidification and/or clogging of bio‐ (trickling) filters. Chemical systems are also thought to be much more reliable and they occupy a much smaller footprint. But with the development of sophisticated plastic materials as bacterial carrier material for bioreactors it is now also feasible to biologically treat polluted (bio)gas stream with high concentrations of H2S1. In the near future biological treatment may even surpass chemical treatment of H2S as most favourable process.