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Liquified cow manure commonly is stored in a covered digester where microbes from the animals' digestive systems produce gas. The gas then is cleaned and compressed into a liquid fuel that can be ...
The manure is usually stored in slurry form (slurry is a liquid mixture of urine and feces). During storage on farm, slurry emits methane and when manure is spread on fields it emits nitrous oxide and causes nitrogen pollution of land and water. Poultry manure from factory farms emits high levels of nitrous oxide and ammonia. [108]
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The ranch is known to travelers for the "ripe, tangy odor of cow manure", described alternately as a "horrible stench" [16] and "a good, honest, American smell". [17] This smell inspired food writer Michael Pollan to conduct the research on factory farming that led to his sustainability book, The Omnivore's Dilemma . [ 16 ]
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"Cow Town", [clarification needed] written in the early 1940s, discusses the travails of a city vastly built on cow manure and the hardships brought upon by the resulting methane biogas. Carter McCormick, an engineer from a town outside the city, is sent in to figure out a way to utilize this gas to help power, rather than suffocate, the city.
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Unlike manure produced in a conventional farm, CAFO manure cannot all be used as direct fertilizer on agricultural land because of the poor quality of the manure. [citation needed] Moreover, CAFOs produce a high volume of manure. A feeding operation with 800,000 pigs could produce over 1.6 million short tons (1,500,000 tonnes) of waste per year ...