H2S Treatment for Anaerobic Digestion Biogas
MV Technologies hydrogen sulfide removal systems are in use to treat biogas for emissions control to beneficial end-use across all forms of biogas processes on farms, at wastewater treatment facilities and for large waste and industrial facilities.
We successfully partner with engineering firms, design & build companies, and end-users to help identify and design the right H2S removal solution for site-specific requirements from the common mixed reactor to dry anaerobic digestion to plug flow anaerobic digestion processes.
Our H2S removal solutions offer design flexibility and are often the most cost-effective and easy to operate technology for most AD biogas projects.
The actual production of H2S during anaerobic digestion is a complex biological and chemical process that is highly variable across a range of applications, even within a single digester.
Variations in feedstock source and consistency, temperature changes, and fluctuations in water chemistry all can have a significant impact on the quantity of H2S included in the biogas stream. These variations in H2S concentrations can present significant challenges to conventional biological systems.
Typical User Conditions
H2S concentrations in biogas from anaerobic digesters can range from highs of more than 20,000 ppmv to values of less than 100 ppmv and as noted above, the fluctuations around a mean value in any given digester can be significant. It is the variability in concentration that is one of the peculiar and critical elements to address in the design of an H2S removal system.
Additionally, in evaluating H2S treatment approaches, an important metric to consider is the Total Cost of Ownership (TCO).
The TCO includes capital cost such as the vessel size, pumps and installation costs, and the operating costs, largely determined by media life and resulting time between replacement -- itself a function of biogas flow rate and H2S concentration. MV's enhanced iron sponge (BAM) media is guaranteed to remove up to 13 pounds of H2S per cubic foot, one of the highest removal efficiencies in the industry.
Cost elements often overlooked during comparison of H2S treatment approaches:
- Power costs – increase in pressure drop can result in increase in power costs
- Lost Revenue due to system downtime – maintenance/media changes
- Replacement of proprietary nutrients and/or chemical/caustic
- The costs of testing for warranty or regulatory requirements
- Operator attention time – it is not “free”