Biochar improves N cycling during composting of olive mill wastes and sheep manure

Waste Management
Inés López-CanoMiguel Angel Sánchez-Monedero

Abstract

The use of biochar has been revealed to have beneficial effects during the composting of manures and other N-rich materials by reducing N losses and enhancing the rate of the process. However, the impact of biochar has not been explored in other complex organic matrices with low N nitrogen that may hinder the composting process. The main novelty of this work was to study the impact of a small amount of biochar (4%) on the composting process of olive mill wastes, which are characterised by a recalcitrant lignocellulosic composition with reduced nitrogen (N) availability. Two treatments: (i) control (olive mill waste 46%+sheep manure 54%, dry weight) and (ii) the same mixture treated with biochar (4%), were composted during 31 weeks. The incorporation of a small amount of biochar improved N cycling by increasing NO3(-)-N content, indicating a higher nitrifying activity, and reducing N losses by 15% without affecting the amount of N2O released. The use of biochar as an additive for composting could improve the value of olive mill waste composts by reducing N losses and increasing N availability in lignocellulosic and N-poor materials.

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Citations

Jul 16, 2017·The Science of the Total Environment·Jawaria SadafMuhammad Imtiaz Rashid
Jun 25, 2019·Journal of Experimental Botany·Zhixiang JiangBaoshan Xing
Nov 21, 2019·Biotechnology and Applied Biochemistry·Ayodeji BelloXiuhong Xu
May 30, 2017·Environmental Science and Pollution Research International·Shaohua WuZhenfeng Han
Sep 22, 2017·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·S Aalfin EmmanuelSung-Cheol Koh
Jul 22, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Shizheng ZhouYan Wang
Jun 29, 2018·Environmental Science and Pollution Research International·Yun-Bei LiJi-Shao Jiang
Jan 6, 2021·Environmental Science and Pollution Research International·Ilyass TabrikaKhalid Azim
Oct 14, 2020·Journal of Environmental Management·João A AntonangeloHailin Zhang
Mar 20, 2021·The Science of the Total Environment·Meiling LiuZhiling Gao

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