Chinese Journal of Agrometeorology ›› 2020, Vol. 41 ›› Issue (03): 138-145.doi: 10.3969/j.issn.1000-6362.2020.03.002

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 Characteristics of Ammonia Emissions from Trough Composting of Swine Manure Biogas Residue and Corn Cob

 YU Xin, ZHENG Yun-hao, ZHU Zhi-ping, ZHANG Yu, CAO Qi-tao   

  1.  Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, MARA, Beijing 100081, China
  • Online:2020-03-20 Published:2020-03-20
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Abstract:  Composting is a promising way of animal manure treatment and a major source of ammonia (NH3) emissions. However, such studies related to swine manure biogas residue were few and the NH3 emissions data from the field processing were still lacked. To fill this research gap, NH3 emissions from an industrial trough composting system treating swine manure biogas residue and corn cob were investigated in this study. A real-time online gas monitoring system was established to continuously monitor the changes of NH3 concentrations in the plant, calculate the NH3 emission flux and analyze the characteristics of NH3 emissions. Results showed that NH3 concentrations in the composting plant during a composting period (38 days) ranged from 0.85 to 22.40mgm-3, with a mean value of 3.63±1.34mgm-3. The NH3 concentration in the first two weeks(4.70±3.64mg·m-3) was significantly higher than that in the last two weeks(3.00±1.49mg·m-3), and the concentration was higher than the limit value of the emission standard for odor pollutants in most time. Due to the impact of ambient temperature and compost turning, the NH3 concentrations in the daytime were higher than that in the nighttime, with the highest mean value of 6.77±4.37mgm-3 during time of 12:00-16:00, followed by 4.26±2.07mgm-3 during 16:00-20:00, and 3.62±1.46mgm-3 during 8:00-12:00. In this plant, NH3 emission flux per volume unit of compost was 50.25 to 103.99mg·m-3·h-1, with an mean value of 103.99±37.93mg·m-3·h-1. During the whole composting process, the NH3 emission per unit of compost was 94.84gm-3. The conclusions indicate that the NH3 concentrations in the composting plant are primarily impacted by the raw materials and the ventilation and management system. It is suggested to choose appropriate emission reduction measures based on the NH3 concentrations and operational parameters in the actual production process. Results of this study can provide scientific support for the control of NH3 emissions during swine manure composting.

Key words:  Trough composting, Ammonia emission, Swine manure, Biogas residue

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