Institute of Bioresource and Agriculture, Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region.
Gujarat Pollution Control Board, Gandhinagar, Gujarat 382010, India.
Bioresour Technol. 2022 Oct;362:127765. doi: 10.1016/j.biortech.2022.127765. Epub 2022 Aug 17.
This work reported a new waste functionalization and utilization method, which use digestate to prepare hydrochar to improve methane production from food waste (FW) and sewage sludge (SS). Experimental results presented that 10 g/L hydrochar obtained the cumulative methane production of 133.11 ± 1.18 mL/g volatile solids added, 26.99 % higher than that without hydrochar addition. By monitoring the conversion of model metabolic intermediates, 10 g/L hydrochar was determined to favor hydrolysis, acidogenesis and methonogenesis bio-processes involved in methane production, thus improving the degradation of solubilized organics and consumption of short-chain fatty acids (SCFAs) during the co-digestion. Microbial investigation revealed that 10 g/L hydrochar enriched the microbes relevant to methane production (e.g., Methanosaeta and Syntrophomonas), but reduced the abundances of hydrolysis- and acidogenesis-related microbes (e.g., Acinetobacter). This hydrochar-based preparation and utilization strategy might offer a novel paradigm for waste-control-waste, bringing economic and environmental benefits.
本研究报道了一种新型的废物功能化和利用方法，利用消化液制备水热炭来提高厨余垃圾（FW）和污水污泥（SS）的甲烷产量。实验结果表明，添加 10 g/L 水热炭可使挥发性固体的累积甲烷产量达到 133.11±1.18 mL/g，比不添加水热炭时提高了 26.99%。通过监测模型代谢中间产物的转化，确定 10 g/L 水热炭有利于甲烷产生过程中涉及的水解、产酸和产甲烷生物过程，从而提高了共消化过程中溶解有机物的降解和短链脂肪酸（SCFAs）的消耗。微生物研究表明，10 g/L 水热炭富集了与甲烷产生相关的微生物（如 Methanosaeta 和 Syntrophomonas），但降低了水解和产酸相关微生物（如 Acinetobacter）的丰度。这种基于水热炭的制备和利用策略可能为废物控制-废物利用提供一种新的范例，带来经济和环境效益。
