There is growing concern about residual antibiotics and feed additives in the manure of treated animals because of the effects of these residues in the environment. Monensin is the most widely used ionophore coccidiostat in the U.S. The objective of this study was to determine the fate and effect of monensin during the anaerobic digestion of dairy manure. Duplicate plug flow field-scale digesters were operated using non-amended dairy manure and dairy manure amended with monensin to 1 and 10 mg/L for 56 days at 30°C at an organic loading rate of 1.4 kg VS/m3-d and 17-day hydraulic retention time. Results showed that monensin was reduced approximately 70% during anaerobic digestion. Methane production from digesters using manure amended with 1 mg/L monensin was comparable to that from digesters operated without added monensin. However, digesters using manure amended with 10 mg/L monensin yielded 75% less methane than digesters using manure without added monensin. These results suggest that anaerobic digestion is an effective treatment for reducing, but not eliminating, monensin in dairy manure. Monensin did not reduce methane production at concentrations expected in dairy manure at recommended dosage rates.
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机译:由于这些残留物对环境的影响,人们越来越关注残留在处理过的动物粪便中的抗生素和饲料添加剂。莫能菌素是美国使用最广泛的离子载体抗球虫药。本研究的目的是确定莫能菌素在厌氧消化乳牛粪过程中的命运和作用。使用未修正的乳牛粪和用莫能菌素修正为1和10 mg / L的乳牛粪在30°C以1.4 kg VS / m <3的有机负荷速率运行双重塞流场规模的消化器 sup> -d和17天的水力停留时间。结果表明,莫能菌素在厌氧消化过程中减少了约70%。使用添加了1 mg / L莫能菌素的粪肥在消化池中产生的甲烷与未添加莫能菌素的消化池中的甲烷产量相当。但是,使用粪肥添加了10 mg / L莫能菌素的消化池产生的甲烷比不添加莫能菌素的肥料消化池的甲烷减少了75%。这些结果表明,厌氧消化是减少但不能消除奶牛粪中莫能菌素的有效方法。在推荐的剂量率下,莫能菌素在乳牛粪中预期的浓度下不会减少甲烷的产生。
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