Anaerobic lagoons are used to dispose of animal waste, particularly that of cows and pigs. The waste is washed into the
lagoon by flushing the animal pens with water. Solid waste, particularly the fibrous type of cows, is sometimes separated before the
wastewater enters the lagoon to prevent the buildup of solid material.
Anaerobic organisms naturally present in the
manure and the environment decompose the waste in the
anaerobic conditions of the lagoon.
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A liquid-based manure management system, characterized by waste residing in water to a depth of at least six feet for a period ranging between 30 and 200 days. Bacteria produce methane in the absence of oxygen while breaking down waste.