Functional Materials Laboratory (FML), School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China.
Functional Materials Laboratory (FML), School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China; Qinghai Building and Materials Research Academy Co., Ltd, the Key Lab of Plateau Building and Eco-community in Qinghai, Xining, Qinghai 810000, China.
Waste Manag. 2023 Mar 15;159:163-173. doi: 10.1016/j.wasman.2023.01.036. Epub 2023 Feb 9.
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 CH 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.
碳材料已广泛应用于厌氧消化（AD），但零维碳量子点（CQDs）在厌氧共消化（AcoD）中的作用尚未见报道。本工作研究了从芦荟皮中提取的 CQDs（AP-CQDs）对芦荟皮和奶牛粪便的 AcoD 系统的影响。AP-CQDs 加速剂的添加使累积 CH 产率从 201.14 增加到 266.92-339.64 mL/g VS，总化学需氧量去除效率从 34.72%提高到 48.77-57.87%。使用含有 0.36wt.%AP-CQDs 的消化物进行热重分析，质量损失为 47.15%，总养分含量有很大提升，达到了 46.65 g/kg。AP-CQDs 具有优异的电子交换能力，可能有助于在 AD 过程中直接进行种间电子转移。此外，AP-CQDs 的使用可以富集产甲烷微生物（Methanosarcina 和 Methanobacterium）。这些发现为提高甲烷产量提供了可行的策略，并提高了对生物质废物双重利用的认识。
