Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.
Gujarat Pollution Control Board, Gandhinagar, Gujarat 382 010, India.
Bioresour Technol. 2021 Oct;337:125384. doi: 10.1016/j.biortech.2021.125384. Epub 2021 Jun 16.
In this research, we investigated and compared the effects of three widely used conductive materials, e.g., zero-valent iron (Fe), magnetite (FeO), and biochar on the performance, stability, and in-depth mechanism during the anaerobic co-digestion process of sewage sludge and food waste. Among the three conductive materials, Fe could achieve the highest cumulative methane production of 394.0 mL/g volatile solids (VS) , which was 1.24-fold and 1.17-fold higher than that receiving FeO and biochar. The mechanistic studies indicated that compared to the FeO and biochar groups, Fe could significantly enhance the release of soluble protein, polysaccharide, and dissolved organic matters, the degradation of volatile fatty acids and VS, and the activities of key enzymes and direct interspecies electron transfer (DIET). Consequently, the methane yield and digestate dewaterability were notably improved. Collectively, these findings will offer suggestions of the preferable conductive materials in the anaerobic co-digestion process for decision makers.
在这项研究中，我们研究并比较了三种广泛使用的导电材料，即零价铁 (Fe)、磁铁矿 (FeO) 和生物炭，它们在污水污泥和食物废物的厌氧共消化过程中的性能、稳定性和深入机制。在这三种导电材料中，Fe 可实现最高的累积甲烷产量 394.0 毫升/克挥发性固体 (VS)，比接收 FeO 和生物炭的甲烷产量分别高 1.24 倍和 1.17 倍。机理研究表明，与 FeO 和生物炭组相比，Fe 可显著提高可溶性蛋白质、多糖和溶解有机物的释放、挥发性脂肪酸和 VS 的降解以及关键酶和直接种间电子转移 (DIET) 的活性。因此，甲烷产量和消化物的脱水性能得到显著提高。总的来说，这些发现将为决策者提供在厌氧共消化过程中选择合适的导电材料的建议。
