Biochar as a waste management strategy for cadmium contaminated cocoa pod husk residues

IF 1.2 Q4 ENVIRONMENTAL SCIENCES
D. A. Pinzon-Nuñez, Carlos Alberto Adarme-Duran, L. Vargas-Fiallo, Nélson F. Rodríguez-López, C. Ríos-Reyes
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引用次数: 1

Abstract

Purpose The role of cocoa pod husk waste in soil cadmium contamination has been largely overlooked. Hence, this study aims to provide a strategy for the management of cocoa pod husk waste when representing a pollution menace for cocoa plantations.Method Cocoa pod husks waste was subjected to composting and pyrolysis for decreasing the heavy metal content. Biochar and compost were characterized using SEM-EDS, and FTIR-ATR. Macro and micronutrients (Mg, K, Zn, Fe, Cu, Zn, Mn, and Na), and Cd were measured by atomic absorption spectroscopy (AAS). Sorption experiments and soil incubation experiments for two months were also carried out looking for an application of CPH materials in Cd sorption and remediation.Results Pyrolysis showed more effectiveness for Cd reduction in cocoa pod husk waste (90%) than composting (66%), 700 ℃ was the optimal temperature. Equilibrium isotherm experiments showed maximum Cd adsorption of 21.58 mg g-1 for Bc700 in solution. Biochar showed a small reduction of available Cd in naturally contaminated soil. Both materials have the potential to be used as organic fertilizer because of their high nutrient contents.Conclusion Biochar is an alternative to compost for the management of post-harvest cocoa wastes contaminated with Cd.
生物炭作为镉污染可可荚壳残留物的废物管理策略
目的可可荚壳废弃物在土壤镉污染中的作用一直被忽视。因此,本研究旨在为可可豆荚废料的管理提供一种策略,当代表可可种植园的污染威胁时。方法对可可豆壳废弃物进行堆肥和热解处理,降低其重金属含量。利用SEM-EDS和FTIR-ATR对生物炭和堆肥进行了表征。采用原子吸收光谱法(AAS)测定了宏、微量元素Mg、K、Zn、Fe、Cu、Zn、Mn、Na和Cd。进行了为期两个月的吸附实验和土壤培养实验,寻找CPH材料在Cd吸附和修复中的应用。结果热解对可可豆壳废弃物Cd的还原效果(90%)优于堆肥(66%),最适温度为700℃。平衡等温线实验表明,Bc700对Cd的最大吸附量为21.58 mg g-1。在自然污染的土壤中,生物炭显示出有效镉的少量减少。这两种材料都有潜力作为有机肥料,因为它们的高营养含量。结论生物炭是一种可替代堆肥处理可可采收后Cd污染废弃物的方法。
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来源期刊
CiteScore
2.10
自引率
26.70%
发文量
0
审稿时长
13 weeks
期刊介绍: The International Journal of Recycling of Organic Waste in Agriculture is an open access journal that publishes high-quality solicited and unsolicited articles, in all areas of Recycling of organic waste including: -Solid waste reuse in agriculture -Waste water reuse in agriculture -Utilization of organic wastes: composting -Ways to reduce, reuse and recycle organic waste -Social and economic impact of reduction, reuse and recycling of organic waste in agriculture -Methods to raise the public awareness of recycling and reuse of organic waste in agriculture -Organic waste utilization in animal and poultry nutrition -Urban food waste composting
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