Department of Soil Science, Federal University of Lavras, Department of Soil Science, P.O. Box 3037, 37200-000 Lavras, Minas Gerais, Brazil.
Bioresour Technol. 2010 Feb;101(4):1239-46. doi: 10.1016/j.biortech.2009.09.024. Epub 2009 Sep 30.
The aim of this study was to evaluate the use of biochar (produced by slow pyrolysis of Eucalyptus grandis biomass) as bulking agent for the composting of poultry manure. Three composting mixtures were prepared by the turned-pile system by mixing poultry manure with different organic wastes used as bulking agent (biochar, coffee husk and sawdust) in a proportion of 1:1 (fresh weight). Despite the inert nature of biochar, the composting mixture prepared with biochar underwent an organic matter degradation of 70% of the initial content. The organic matter of the poultry manure-biochar mixture was characterised by a high polymerisation degree of the humic-like substances, with a relative high proportion of humic acids in relation to fulvic acids. At the end of the composting process, the humic acid fraction represented more than 90% of the alkali extractable fraction, reflecting the intense humification of this material. Enrichment of poultry manure with biochar reduced the losses of nitrogen in the mature composts, although the use of sawdust would be more efficient in preserving the organic matter and nitrogen in the mature compost.
本研究旨在评估生物炭（通过缓慢热解大桉树生物质制成）作为膨松剂在禽畜粪便堆肥中的应用。通过混合禽畜粪便和不同的有机废弃物（生物炭、咖啡壳和木屑）作为膨松剂，采用翻堆系统制备了三种堆肥混合物，比例为 1:1（新鲜重量）。尽管生物炭具有惰性，但由生物炭制备的堆肥混合物经历了初始含量 70%的有机物降解。禽畜粪便-生物炭混合物的有机物具有较高的类腐殖质物质聚合度，腐殖酸与富里酸的比例相对较高。在堆肥过程结束时，腐殖酸组分占碱提取组分的比例超过 90%，反映了该材料强烈的腐殖化。用生物炭富集禽畜粪便减少了成熟堆肥中氮的损失，尽管使用木屑更有利于保持成熟堆肥中的有机物和氮。
