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| Nitrogenous Gas Emissions from Solid Swine Manure Under Natural Composting Conditions |
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| KeyWord:solid swine manure; compost; nitrogenous gas; influencing factors |
| Author Name | Affiliation | | YUAN Yu-ling | College of Resources and Environment, Hunan Agricultural University，Changsha 410128, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | WANG Li-gang | Ministry of Agriculture Key Laboratory of Non-point Source Pollution Control, CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LI Hu | Ministry of Agriculture Key Laboratory of Non-point Source Pollution Control, CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | DING Gang-qiang | Guangdong University of Technology, Guangzhou 510006, China | | HAN Sheng-hui | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | WEI Jian-hong | College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China |
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| Abstract: |
| In China growing livestock industries are arousing public concerns over the environmental quality, especially atmospheric environment. In this study, we collected emission data of three nitrogenous gases, nitrous oxide（N2O）, nitrogen oxides（NOx） and ammonia（NH3）, from naturally composted swine manure piles in Changsha, Hunan, China, during one composting period（53 days）. A statistic chamber was employed for sampling gases and gas-chromatography for quantifying gas concentrations. The daily emission rate of NH3 was the highest at the beginning of the composting, then decreased rapidly during the following 14 days, and kept relatively low during the rest time of the experiment; The emissions of N2O and NOx were initially low but gradually increased. The emissions of nitrogenous gases from the surface and inside of the compost piles showed roughly similar patterns. Since no ammonium or nitrate in the compost piles were measured at the beginning, it could be hypothesized that the initial high NH3 emissions could result only from urea or dissolved NH3 in the original manure while emissions of N2O or NOx could be related to increased moisture or nitrate at the late stage of the composting process. Further studies are needed to prove or disprove the hypotheses. |
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