Manu M K, Wang Chen, Li Dongyi, Varjani Sunita, Xu Yunjie, Ladumor Narsi, Lui Michael, Zhou Jun, Wong Jonathan W C
Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong.
Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong; College of Land Science and Technology, China Agricultural University, Beijing 100193, PR China.
Bioresour Technol. 2021 Dec;341:125871. doi: 10.1016/j.biortech.2021.125871. Epub 2021 Sep 2.
High concentration of NH-N in food waste digestate (FWD) produced from biological treatment of food waste is considered as a major threat on the composting process resulting in production of immature compost. Hence, a laboratory batch composting study was conducted to examine the feasibility of using biochar as a physical additive to ameliorate the inhibitory effect of NH-N and to mitigate the nitrogen loss during FWD composting. FWD was co-composted with tobacco biochar at a dosage of 0%, 2.5%, 5% or 10% (dw) in bench-scale composters with a controlled aeration system. The addition of 10% biochar enhanced the degradation rate resulting in 44% higher carbon decomposition than the control. Besides, 10% biochar amendment reduced NH and N loss by 58% and 5%, respectively and significantly reduced NH-N content to HKORC limit of < 700 mg/kg dw within 5 days showing the beneficiary impact of biochar addition.
食物垃圾生物处理产生的食物垃圾消化液（FWD）中高浓度的氨氮（NH-N）被认为是堆肥过程的主要威胁，会导致未成熟堆肥的产生。因此，开展了一项实验室批次堆肥研究，以检验使用生物炭作为物理添加剂来减轻NH-N抑制作用并减少FWD堆肥过程中氮损失的可行性。在具有可控曝气系统的实验室规模堆肥器中，将FWD与烟草生物炭以0%、2.5%、5%或10%（干重）的剂量进行共堆肥。添加10%的生物炭提高了降解速率，导致碳分解量比对照高44%。此外，添加10%的生物炭分别使氨氮和氮损失减少了58%和5%，并在5天内将NH-N含量显著降低至<700 mg/kg干重的香港有机资源回收中心（HKORC）限值，显示了添加生物炭的有益影响。
