Effects of membrane covers and biochar on compost quality and greenhouse gas reduction in aerobic composting

Jie Cao, H. Qu, Ruirong Li, Pengjun Wang, Jingjing Fu, Mingjiang Chen
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Abstract

The addition of biochar and the use of membrane coverings are two methods used in aerobic composting of agricultural waste. The effectiveness of each of these two methods on compost quality and reduction of greenhouse gas emissions was tested in the laboratory. The results showed that both methods increased the maximum composting temperature and extended the thermophilic period. The germination index of biochar-treated compost and membrane-covered compost reached 70% on the 18th day, which was 12 days earlier than the corresponding value in the control group. The products from the biochar-treated compost had higher pH and lower electrical conductivity, compared with the product of the control group, indicating that these products are more suitable for acidic soils. In terms of greenhouse gas reduction, both methods were found to reduce the emissions of CH4 and N2O from composting. The addition of biochar had a better emission reduction effect on N2O, whereas the membrane covering technique yielded a better effect on CH4 emission reduction. The results of this study provide technical support for managed aerobic composting to reduce greenhouse gas emissions.
膜覆盖物和生物炭对好氧堆肥中堆肥质量和温室气体减排的影响
添加生物炭和使用膜覆盖物是农业废弃物好氧堆肥的两种方法。这两种方法分别对堆肥质量和减少温室气体排放的效果进行了实验室测试。结果表明,这两种方法都提高了堆肥的最高温度,延长了嗜热期。生物炭处理堆肥和膜覆盖堆肥的发芽指数在第 18 天达到 70%,比对照组的相应值提前了 12 天。与对照组的产品相比,生物炭处理堆肥的产品具有更高的 pH 值和更低的电导率,这表明这些产品更适合酸性土壤。在减少温室气体排放方面,两种方法都能减少堆肥产生的甲烷和氧化亚氮的排放。添加生物炭对 N2O 的减排效果更好,而膜覆盖技术对 CH4 的减排效果更好。这项研究的结果为有管理的好氧堆肥减少温室气体排放提供了技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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