Research Project Summary Information
Efficient Hydrogen Sulfide Removal from Landfill gas for Bioenergy (ST10374-1)
A system for removing hydrogen sulfide (H2S) and other reduced sulfur compounds from biogas generated by the microbial decomposition of manure, landfill debris, or sewage sludge, was demonstrated at two sites; a dairy farm that uses methane generated in its manure digester to generate electrical power, and a construction and demolition landfill requiring removal of H2S for odor control. The system uses iron salts precipitated on an organic solid matrix (i.e., dried cow manure). When exposed to H2S, ferrous and ferric sulfides are formed. When the system is regenerated, a process whereby air is pumped through the system, the H2S is oxidized to elemental sulfur. Regeneration also returns the iron to the ferrous and ferric oxidation states; where it can again react with H2S in the next cycle.
The objectives of pilot testing were to characterize operational parameters for the farm and landfill applications, demonstrate the ability of the media to be regenerated, develop costs of installation and operation at moderate gas flow rates, and evaluate the spent media as a soil amendment.
Ferric carbonate impregnated materials are easier to handle and more environmentally friendly than other solid media H2S removal materials (e.g., iron sponge). The system also has the promise of being less expensive to install and operate than other solid media systems.
Removal of H2S was demonstrated using a pilot-scale modular system. The system can be regenerated five- to-10 times before free sulfur begins to clog the matrix. The high iron and sulfur content of the spent organic matrix makes it an excellent soil conditioner for alkaline soils.
500 Technology Farm Drive
Geneva, NY 14456
Waste Management and Pollution Prevention
Water/Wastewater treatment systems
NYSERDA Contact Information
R&D - Environment & Energy Res