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| Pilot-scale study on effects of exogenous additives on reducing NH3 and H2S emissions from pig manure compost |
| Received:February 25, 2021 |
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| KeyWord:livestock manure;pilot-scale trial;aerobic composting;NH3;H2S |
| Author Name | Affiliation | E-mail | | SONG Xiuchao | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | GUO Dejie | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | CHENG Weimin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LUO Jia | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XU Yehong | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | WANG Guangfei | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LIU Xinhong | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | MA Yan | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | myjaas@sina.com |
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| Abstract: |
| This study aims to determine how nitrogen and sulfur are transformed into NH3 and H2S while pig manure is composted with different additives under factory conditions, and to understand the effect of reducing NH3 and H2S emissions on composting. Four treatments, in which zeolite(10%) and superphosphate(5%) were added to the manure separately, another in which both were added, and a final treatment without additives that was used as the control(CK), were set up in a pilot study. The results showed that different additives had little effect on the temperature of the compost. Compared with the CK, the addition of zeolite could increase the total nitrogen(TN) and total sulfur(TS) of compost products by 17.5% and 17.1%, respectively, while the addition of calcium superphosphate(CaSSP) increased the TN and TS by 26.1% and 40.6%, respectively. Adding both zeolite and CaSSP had the best effect on nitrogen retention, which increased TN by 32.1% and TS by 52.8%. Zeolite reduced the emissions of NH(3 by 8.2%) and H2S(by 9.4%) through adsorption. CaSSP reduces the release of NH3 by increasing the ammonium nitrogen content, resulting in a 37.6% reduction in emissions. However, because of the higher content of sulfur in CaSSP, H2S emissions increased significantly(P<0.05). The effects of the combination of the two additives on reducing NH3 and H2S were not different from those of the CaSSP alone. Considering the quality of the compost and NH3 emissions, adding a certain amount of CaSSP to industrial composting processes can achieve a nutrient retention effect; however, the addition of both the additives had no synergistic effect. Therefore, the addition of CaSSP should be combined with the appropriate process parameters; otherwise, it would increase the risk of H2S emissions. |
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