Pit gases are generated or produced during storage of animal manure by the decomposition of organic matter by microorganisms within in-ground and enclosed structures. These gases are comprised of ammonia, methane, hydrogen sulfide, and various volatile organic compounds. At high concentrations, as might exist over the manure surface, several manure pit gases pose health risks. At lower concentrations, as may exist in areas surrounding the storage structure, the gases may be a nuisance if they are odorous or irritating. In confined spaces such as pits, these gases displace oxygen, making their presence a SUFFOCATION HAZARD in high concentrations. Never enter a manure pit without taking proper precautions.
Author: Jactone Arogo-Ogejo, Biological Systems Engineering Department, Virginia Tech
