期刊
WASTE MANAGEMENT
卷 159, 期 -, 页码 163-173出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2023.01.036
关键词
anaerobic co-digestion; Accelerants; Carbon quantum dots; Aloe peel; biogas yield; Fertilizer utilization
This study investigates the effect of aloe peel-derived carbon quantum dots (AP-CQDs) on the anaerobic co-digestion system of aloe peel and dairy manure. The results show that the addition of AP-CQDs can enhance methane production and improve chemical oxygen demand removal efficiency while enriching methane-producing microorganisms.
Carbon materials have been widely used in anaerobic digestion (AD), but the role of zero-dimensional carbon quantum dots (CQDs) in anaerobic co-digestion (AcoD) has not yet been reported. In this work, the effect of aloe peel-derived CQDs (AP-CQDs) on the AcoD system of aloe peel and dairy manure was investigated. The addition of AP-CQDs accelerants increased the cumulative CH4 yield from 201.14 to 266.92-339.64 mL/g VS and increased total chemical oxygen demand removal efficiency from 34.72 % to 48.77-57.87 %. The use of a digestate with 0.36 wt.% of AP-CQDs resulted in a thermogravimetric mass loss of 47.15 % and a promising total nutrient content of 46.65 g/kg. The excellent electron exchange capacity of AP-CQDs may facilitate direct interspecies electron transfer during the AD process. Moreover, the use of AP-CQDs can enrich methanogenic microorganisms (Methanosarcina and Methanobacterium). These findings provide a viable strategy for improving methane production and create awareness regarding the dual use of biomass waste.
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