title: [Degradation of oxytetracycline in chicken feces aerobic-composting and its effects on their related parameters].
abstract: In order to illustrate the degradation of tetracyclines (TCs) and their influences on process parameters during the period of chicken feces aerobic-composting, the degradation of oxytetracycline (OTC), a kind of TCs and its effects on parameters during the period of chick feces aerobic-composting including temperature, pH, and germination index were investigated using the method of aerobic-composting. The contents of OTC decreased gradually with composting time. The degradation rate was high before 10 d, and then decreased gradually. The differences in OTC degradation among the OTC treatments were also found. The degradation rate of OTC was higher at the level of 25 mg.kg-1, than that of other levels. The degradation curve of OTC could be described by the first-order kinetic model, and the correlation coefficients ranged from 0. 911 1 to 0. 9913. The impacts of OTC on chick feces composting were found. OTC could decrease the rising rate of composting temperature and make the high temperature (> or =50 degrees C) period shorter than that of the control. The values of pH, TN, WSC, and the content of NH: -N of composting were 4.58%, 12.62%, 49.06%, and 35.30% higher than those of the control. The impacts of OTC on maturity of chicken feces composting was not found when the OTC addition contents were lower than 50 mg.kg-1. However, the strong impacts of OTC on maturity of chicken feces composting were found when the OTC addition contents were higher than 50 mg.kg-1. The rates of NH+4 -N to NO-3 -N, and GI were much higher than 0. 5 and lower than 80% , respectively. Theses results suggest that OTC have strong impacts on chicken feces composting when the contents of TOC was higher than 50 mg.kg-1, although OTC have the short half-life period ranged from 1.79-4.88 d.
authors.affiliation: Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, China Academy of Agricultural Sciences, Beijing 100081, China. wangguizhenxx@163.com
authors.forename: Gui-Zhen
authors.initials: GZ
authors.lastname: Wang
authors.forename: Zhao-Jun
authors.initials: ZJ
authors.lastname: Li
authors.forename: Shu-Qing
authors.initials: SQ
authors.lastname: Zhang
authors.forename: Xiao-Tong
authors.initials: XT
authors.lastname: Ma
authors.forename: Yong-Chao
authors.initials: YC
authors.lastname: Liang
mesh_terms: D000332:Aerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D002645:Chickens; D005243:Feces / Q000737:chemistry*; D008372:Manure; D010118:Oxytetracycline / Q000302:isolation & purification* / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods*
chemical_list: D008372:Manure; D010118:Oxytetracycline