Coffee industry waste-derived biochar: characterization and agricultural use evaluation according to Brazilian legislation

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Bragantia Pub Date : 2021-01-01 DOI:10.1590/1678-4499.20210159
Ruan Carnier, A. Coscione, Douglas Delaqua, C. A. Abreu
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引用次数: 3

Abstract

The agricultural use of biochar has been the focus of much research in the last decade due to the improvement of soil chemical, physical, and biological attributes. Nonetheless, Brazil still has no specific legislation for biochar, limiting its agricultural use. The objective of the present work is to evaluate the use of biochar produced from spent coffee grounds (SCG) and coffee parchment (CP) by slow pyrolysis at 700 °C according to the existing framework of the Brazilian Ministry of Agriculture, Livestock, and Food Supply (MAPA) legislation for organic fertilizer, soil conditioner or plant substrate. Biochar was characterized according to normative instructions No. 17, 31, 61, 7, 5 and 35. Although not required by the addressed legislation, the semitotal content of macroand micronutrients was also determined. While CP biochar could be used as an organic fertilizer or plant substrate, SCG biochar, due to its higher Ni content and lower than required cation exchange capacity (CEC), did not meet MAPA legislation criteria to allow for its agricultural use. Future regulations can be based on the current standards, and structural attributes, such as total C content, particle size distribution, and complete macroand micronutrient determination should be included. Further research may also indicate the viability of biochar use as a soil conditioner based on a more representative set of biomasses with a higher CEC. These considerations will help to take advantage of the benefits of biochar to soil, contributing to a circular economy, which is still at a difficult stage in Brazil.
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咖啡工业废物衍生的生物炭:根据巴西立法的特性和农业用途评估
由于生物炭能改善土壤的化学、物理和生物特性,在过去十年中,生物炭的农业利用已成为许多研究的焦点。尽管如此,巴西仍然没有针对生物炭的具体立法,限制了其农业用途。本研究的目的是根据巴西农业、畜牧业和食品供应部(MAPA)立法的现有框架,评估在700°C下通过缓慢热解从废咖啡渣(SCG)和咖啡羊皮纸(CP)中产生的生物炭用于有机肥料、土壤调节剂或植物基质的使用。生物炭按照第17、31、61、7、5、35号规范说明书进行表征。虽然所涉及的立法没有要求,但也确定了宏量营养素和微量营养素的半总含量。虽然CP生物炭可以用作有机肥料或植物基质,但SCG生物炭由于其较高的Ni含量和低于所需的阳离子交换容量(CEC),不符合MAPA立法标准,不允许其农业使用。未来的法规可以在现行标准的基础上,并应包括结构属性,如总C含量,粒度分布,以及完整的宏量和微量营养素测定。进一步的研究还可能表明,基于具有更高CEC的更具代表性的生物质,生物炭作为土壤调理剂的可行性。这些考虑将有助于利用生物炭对土壤的好处,为循环经济做出贡献,这在巴西仍处于困难阶段。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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