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| Effects of exogenous microbial agents on pig manure compost quality and tetracycline antibiotic degradation |
| Received:June 11, 2015 |
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| KeyWord:exogenous agents;oxytetracycline;tetracycline;composting |
| Author Name | Affiliation | E-mail | | XIAO Li | Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | | | HUANG Yi-mei | Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | ymhuang1971@nwsuaf.edu.cn | | ZHAO Jun-feng | Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | | | ZHOU Li-na | Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| Microbes have important impacts on composting of animal waste, thus influencing compost quality. An experiment was conducted to investigate the effects of different exogenous microbial agent combinations on pig manure-straw composting and tetracycline antibiotic degradation. A forced ventilation pig manure-straw composting box was employed. Three microbial treatments included:no exogenous microbial agent(CK), white rot fungi(F), and combined white rot fungi, ammonification and nitrification bacteria(FAN). Samples were collected from each treatment at different composting time. Basic physical properties, nitrogen, carbon, total phosphorus, total potassium and tetracycline and oxytetracycline content were determined. Results showed that the addition of foreign microbial agents(F and FAN) had little effect on the maturity of the pig manure-straw compost indicated by seed germination rate, but increased degradation of organic carbon in the compost as well as total phosphorus and potassium content. Of three treatments, the loss of ammonium nitrogen was the lowest(0.24 g·kg-1) in the F treatment. The concentrations of tetracycline(TC) and oxytetracycline(OTC) decreased significantly(P<0.05) over the time. On the 42nd day of composting, the content of both OTC and TC was lower than 5 mg·kg-1 and their degradation rates were greater than 90%. The addition of white rot fungus accelerated the degradation of tetracycline to some extent. |
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