Effects of aeration method and aeration rate on greenhouse gas emissions during composting of pig feces in pilot scale
Effects of aeration method and aeration rate on greenhouse gas emissions during composting of pig feces in pilot scale
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中试曝气方式和曝气量对猪粪堆肥过程中温室气体排放的影响
DOI：
10.1016/j.jes.2014.12.005
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发表时间：
2015-05-01
影响因子：
6.9
通讯作者：
Schuchardt, Frank
中科院分区：
文献类型：
--
作者：
Jiang, Tao;Li, Guoxue;Schuchardt, Frank
本研究的目的是找出减少堆肥过程中温室气体 (GHG) 排放和能源消耗的方法。我们评估了不同曝气率（0、0.18、0.36 和 0.54 L/（kg 干物质 (dm).min））和方法（连续和间歇）对温室气体排放的影响。猪粪和玉米秆按7：1的比例混合。堆肥过程持续了10周，大约每两周翻一次堆肥。结果表明，曝气速率和方法均显着影响温室气体排放。较高的曝气率增加了 NH3 和 N2O 的损失，但减少了 CH4 的排放。例外的是被动曝气处理的CH4排放量低于低曝气量处理。如果没有强制曝气，堆中心的CH4扩散速率非常低，并且部分CH4在表层被氧化。间歇性通气减少了 NH3 和 CH4 的损失，但显着增加了成熟期间 N2O 的产量。间歇曝气增加了硝化/反硝化作用的交替，从而提高了N2O的产量。强制曝气处理的温室气体排放率高于被动曝气处理。强制曝气加速了成熟过程，但无法提高最终产品的质量。与连续曝气相比，间歇曝气可提高O-2供给效率，减少温室气体排放总量17.8%，堆肥36天结束时减少量达到47.4%。 (C) 2015 中国科学院生态环境研究中心。由 Elsevier B.V. 出版
The aim of this study was to uncover ways to mitigate greenhouse gas (GHG) emissions and reduce energy consumption during the composting process. We assessed the effects of different aeration rates (0, 0.18, 0.36, and 0.54 L/(kg dry matter (dm).min)) and methods (continuous and intermittent) on GHG emissions. Pig feces and corn stalks were mixed at a ratio of 7:1. The composting process lasted for 10 weeks, and the compost was turned approximately every 2 weeks. Results showed that both aeration rate and method significantly affected GHG emissions. Higher aeration rates increased NH3 and N2O losses, but reduced CH4 emissions. The exception is that the CH4 emission of the passive aeration treatment was lower than that of the low aeration rate treatment. Without forced aeration, the CH4 diffusion rates in the center of the piles were very low and part of the CH4 was oxidized in the surface layer. Intermittent aeration reduced NH3 and CH4 losses, but significantly increased N2O production during the maturing periods. Intermittent aeration increased the nitrification/denitrification alternation and thus enhanced the N2O production. Forced aeration treatments had higher GHG emission rates than the passive aeration treatment. Forced aeration accelerated the maturing process, but could not improve the quality of the end product. Compared with continuous aeration, intermittent aeration could increase the O-2 supply efficiency and reduced the total GHG emission by 17.8%, and this reduction increased to 47.4% when composting was ended after 36 days. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.