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Oxygen dynamics, organic matter degradation and main gas emissions during pig manure composting: Effect of intermittent aeration.
机构信息
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China.
出版信息
Bioresour Technol. 2022 Oct;361:127697. doi: 10.1016/j.biortech.2022.127697. Epub 2022 Jul 26.
To investigate the effect of intermittent aeration on oxygen dynamics, organic matter degradation and main gas emissions, a lab-scale pig manure composting experiment was conducted with intermittent aeration (I_A, 30-min on and 30-min off) and continuous aeration (C_A). Although aeration volume and oxygen supply of I_A was only half of C_A, I_A could obviously enhance the oxygen utilization efficiency by 96.67 % and reduce energy dissipation for aeration by 50.87 %. Based on the comprehensive analysis of total organic matter, total carbon, total nitrogen, cellulose, hemicellulose and lignin contents, there was no significant difference in organic matter degradation between I_A and C_A (p > 0.05). Moreover, a reduction of 21.71 %, 38.93 %, 44.40 % and 62.19 % of CH, NO and the total GHG emission equivalent as well as NH emissions was realized, respectively, in I_A compared with C_A. Therefore, adopting intermittent aeration was a useful strategy and choice for high-efficiency, high-quality and environment-friendly composting.
为了研究间歇曝气对氧气动态、有机物降解和主要气体排放的影响，采用间歇曝气（I_A，30min 开和 30min 关）和连续曝气（C_A）进行了实验室规模的猪粪堆肥实验。尽管 I_A 的曝气体积和氧气供应量仅为 C_A 的一半，但 I_A 可明显提高氧气利用率 96.67%，并减少曝气能耗 50.87%。基于对总有机物质、总碳、总氮、纤维素、半纤维素和木质素含量的综合分析，I_A 和 C_A 之间的有机物降解没有显著差异（p>0.05）。此外，与 C_A 相比，I_A 分别实现了 CH、NO 和总 GHG 排放当量以及 NH 排放减少 21.71%、38.93%、44.40%和 62.19%。因此，采用间歇曝气是高效、高质量和环保堆肥的有效策略和选择。
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