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堆肥是最合适的处理农业废弃物的技术之一,但在堆肥过程中,碳素的损失及温室气体的大量排放引起越来越多的关注.因此,如何减少堆肥过程中碳素损失成为堆肥面临的重要问题.本研究以猪粪等为原料,利用强制通风反应箱研究了生物炭添加对堆肥过程中碳素转化及碳素损失的影响.结果表明,在堆肥过程中总有机碳呈下降趋势,添加生物炭处理的总有机碳含量提高了6.69%~20.60%;可溶性有机碳的变化规律与总有机碳相似.腐殖质碳含量呈先下降后上升的变化趋势,添加生物炭处理的腐殖质碳含量下降了0.39%~14.97%;腐殖化系数(胡敏酸/富里酸)与生物炭添加量成正比,说明生物炭添加有利于堆肥的腐熟.至堆肥结束,堆料干物质失重率为23.51%~30.91%,碳素损失率为20.71%~28.85%,添加3%生物炭的处理干物质失重率与碳损失率均最高,添加9%生物炭处理均最低.
Composting is one of the most suitable technologies for the treatment of agricultural wastes, but in the process of composting, carbon loss and greenhouse gas emissions have drawn more and more attention.Therefore, how to reduce the carbon loss during compost to become compost The main problems faced in this study pig manure and other raw materials, the use of forced-ventilation reaction tank to study the impact of biochar on carbon conversion and carbon loss in the composting process.The results show that the composting process decreased total organic carbon Trend, the content of total organic carbon increased by 6.69% -20.60% with the addition of biochar, and the variation of dissolved organic carbon was similar to that of total organic carbon.The content of humus carbon decreased first and then increased, and the biochar-treated humus carbon (Humic acid / fulvic acid) is proportional to the amount of biochar added, indicating that the addition of biochar is conducive to compost maturity.At the end of composting, the weight loss rate of heap dry matter is 23.51% -30.91%, and carbon loss rate was 20.71% -28.85%. The treatment with 3% biochar had the highest dry weight loss rate and carbon loss rate, and the lowest rate of 9% biochar treatment.