5 Although small farms and family businesses have been instrumental in market growth, most growth is driven by large-scale operations. poultry production has expanded over the last decade due to increased domestic and foreign demand. At least half of these systems codigest other organics along with poultry manure. Complete mix tanks are the most common design among these systems, although covered lagoons and plug flow systems are both used as well. process manure from about 2 million birds at eight sites in Kentucky, Maryland, Mississippi, Ohio, Pennsylvania, and South Carolina. Current Use of Anaerobic Digestion SystemsĪD systems in the U.S. Anaerobic lagoons produce much more methane than dry manure management systems.įor more information about manure management system types, see Chapter 9 of the USDA Agricultural Waste Management Field Handbook or visit the Livestock and Poultry Environmental Learning Center’s (LPELC) Manure Collection and Handling Systems website.
For poultry operations, anaerobic lagoons are commonly used for layers in the South and Central U.S., often on operations that include egg washing.
Operators may store liquid or slurry poultry manure in anaerobic lagoons-earthen structures which look like farm ponds. Belt systems are more common than scrape and flush systems, and nearly all newly constructed layer houses use belt systems. Belt systems collect deposited manure on a belt that runs continuously under the cages to a spreader for immediate disposal or storage. Scrape and flush systems remove manure mechanically by scraping or hydraulicly by flushing. In other caged bird houses, cages are suspended over a shallower space, and scrape, flush, or belt systems collect the manure more frequently. These types of houses are not commonly being built, but many are still in use.
For poultry raised in high rise houses, cages are raised, and manure collects into deep stacks in a well-ventilated lower level.
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