Hydrogen Sulfide Removal for Biogas Upgrading
H₂S Removal Technology Portfolio
DMT specializes in H₂S removal through a range of desulfurization technologies under the Sulfurex® umbrella: a chemical process (Sulfurex®CR), a biological process (Sulfurex®BF), and a biological-chemical process (Sulfurex®BR). Each H₂S removal treatment method has its own specific advantages that if leveraged correctly, can help maximize a project’s ROI.
Technology Selection for H₂S Removal
There are various factors to consider when selecting the optimal technology for H₂S removal. These factors can be site conditions, gas application, operation & maintenance (O&M), capital expenditure (CAPEX) or operational expense (OPEX). Our sales team will be happy to assist during this selection process.
A helpful and main contributing factor will be the plant’s H₂S inlet concentration, of which it is particularly important to note the 3,000 ppmv line where a Sulfurex® BR would be most optimal compared to the Sulfurex® BF.
What is gas desulfurization (H₂S removal)?
Biogas is a mixture of gases produced by the breakdown of organic matter– primarily methane (CH₄), carbon dioxide (CO₂), hydrogen sulfide (H₂S), water vapor, and other trace compounds (e.g., siloxanes). Using biogas as a renewable energy source requires pretreatment technologies to remove harmful contaminants present in the biogas, such as H₂S and siloxanes.
Hydrogen Sulfide: a toxic gas
H₂S is a toxic gas that has health and safety risks, contributes to SOx emissions and has detrimental effects on cogeneration engines and microturbine units. Due to the high cost of existing H₂S removal technologies, predominantly based on chemical and physical processes, biogas pretreatment contributes significantly to the overall operation and maintenance costs of any energy recovery system.
H₂S Removal Technologies
Common H₂S removal technologies for H₂S removal from biogas fall into one of the following: (1) absorption into a liquid either water or caustic solution; (2) adsorption on a solid such as iron oxide based materials or activated carbon and (3) biological conversion by which sulfur compounds are converted into elemental sulfur by sulfide oxidizing microorganisms with addition of air and oxygen. DMT offers a wide portfolio for gas desulfurization tailored to a plant’s specification.