Anaerobic Digestion: Hydrogen Sulfide Biofiltration from Biogas Using Cow-Manure Compost

Abstract

Integrated farm energy systems utilize an anaerobic digester (AD) to provide a waste treatment solution, improved nutrient recovery and energy generation potential in the form of biogas. This biogas consists primarily of methane and carbon dioxide plus, smaller amounts of trace gases, particularly hydrogen sulfide (H2S). H2S, although present in small quantities (500 – 6000 ppm), is a major problem for internal combustion engines, microturbines and fuel cells. There are numerous chemical, physical and biological methods utilized for removal of H2S from a gas stream. Many of these methods are expensive, labor intensive and generate a waste stream that poses environmental disposal concerns and risks. Research conducted under NYSERDA Agreement #7250 (collaboration between NYSEG and Cornell) has studied the utilization of cow-manure compost for removal of H2S from AD biogas using small-scale reactors.