Effect of phosphogypsum and dicyandiamide as additives on NH3, N2O and CH4 emissions during composting |
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Authors: | Yiming Luo Guoxue Li Wenhai Luo Frank Schuchardt Tao Jiang and Degang Xu |
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Institution: | 1. College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China 2. Institute of Agricultural Technology and Biosystems Engineering, Johann Heinrich von Thuenen-Institute, Braunschweig 38116, Germany 3. College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China;College of Chemistry, Leshan Normal University, Leshan 614004, China 4. Research Institute of Safety and Environment Technology, CNPC, Beijing 102206, China |
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Abstract: | A laboratory scale experiment of composting in a forced aeration system using pig manure with cornstalks was carried out to investigate the effects of both phosphogypsum and dicyandiamide (DCD, C2H4N4) as additives on gaseous emissions and compost quality. Besides a control, there were three amended treatments with different amounts of additives. The results indicated that the phosphogypsum addition at the rate of 10% of mixture dry weight decreased NH3 and CH4 emissions significantly during composting. The addition of DCD at the rate of 0.2% of mixture dry weight together with 10% of phosphogypsum further reduced the N2O emission by affecting the nitrification process. Reducing the phosphogypsum addition to 5% in the presence of 0.2% DCD moderately increased the NH3 emissions but not N2O emission. The additives increased the ammonium content and electrical conductivity significantly in the final compost. No adverse effect on organic matter degradation or the germination index of the compost was found in the amended treatments. It was recommended that phosphogypsum and DCD could be used in composting for the purpose of reducing NH3, CH4 and N2O emissions. Optimal conditions and dose of DCD additive during composting should be determined with different materials and composting systems in further study. |
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Keywords: | composting phosphogypsum dicyandiamide greenhouse gas pig manure |
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