Nitrogenous, calcium and phosphorus levels in carbonized products of livestock carcass, infected manure and medical waste
2008
Sato, H.(Rakuno Gakuen Univ., Ebetsu, Hokkaido (Japan))
Strict sanitation is desired in handling of livestock carcasses, beddings and infectious medical waste in livestock industry. Carbonization plant was established in Rakuno Gakuen University for proper handling and disposal of livestock carcass including digesta, infected beddings of domestic and experimental animals, and medical waste from the animal hospital. The carbonization chamber of the plant was operated under the anaerobic conditions at approximately 600degC for 12 hours, accompanying with natural cooling in room temperature. For the purpose of making use of the carbonized products in the future, nitrogen (N), ammonia, total ash, calcium (Ca) and phosphorus (P) concentrations were examined in the carbonized products from the individual raw materials. The plant completely yielded carbonization products of higher carbon contents in the most cases, and their moisture was less than 7% with scarcely any ammonia. Total N contents were higher (2 to 7%) in the products made of alimentary digesta and muscles from cattle and horses than those of beddings, skeleton and medical waste from the hospital. Carbonized product of skeleton had higher amounts of Ca of approximate 30% and P of approximate 12 to 13% in dry matter basis. Their ash level was 73 to 85% on dry matter. Higher variation was observed in the Ca and P levels in the carbonized product of beddings, medical waste and alimentary digesta of the large animals. However, improper carbonization was observed in some cases of beddings and alimentary digesta which were intensively compressed in the carbonization chamber. Those products showed higher moisture and ammonia levels.
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