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| Effects of freeze-thaw cycles on particle size, structure and organic matter composition of pig manure |
| Received:July 27, 2020 |
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| KeyWord:freeze-thaw cycles;pig manure;organic matter;particle size;effect |
| Author Name | Affiliation | E-mail | | HU Bai-yang | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | JIANG Lin-shu | Beijing University of Agriculture, Beijing 102206, China | | | LI Yan-xia | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | liyxbnu@bnu.edu.cn | | CHEN Xing-cai | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | AN Si-yu | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| To explore the effects of freeze-thaw cycles on particle size distribution and organic matter composition of livestock manure, changes in the particle size distribution of pig manure before and after freeze-thaw cycle treatments were studied using the wet screening method; organic matter components(dissolved organic matter, humic acid, lignin, and protein)were extracted from pig manure before and after freeze-thaw cycle treatments and their structure was characterized using Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance spectroscopy.The results showed that freeze-thaw cycles resulted in the breaking of large particles of pig manure, and the breaking effect became significant with an increase in freeze-thaw cycle times. Compared with samples without freeze-thaw cycle treatment, particlesize>1 000 μm in pig manure treated with 30 freeze-thaw cycles decreased by 6.73%, and particlesize of 38~75 μm and <38 μm increased by 5.94% and 6.13%, respectively. Freeze-thaw cycles reduced the total organic matter content and increased the dissolved and unsaturated organic matter content of pig manure. Moreover, pig manure produced more amino acids and -COO- and C=O functional groups after freeze-thaw cycle treatment. Aromatic degree of dissolved organic matter decreased, remained unchanged for humic acid and lignin,and increased for protein. Studies have shown that freeze-thaw cycles may increase the solubility and mobility of livestock manure in natural environment. |
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