College of Forestry, Henan Agricultural University, Zhengzhou, Henan, 450002, China.
South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510345, China; Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, College of Ecology and Environment, Hainan University, Haikou 570228, China.
Bioresour Technol. 2024 Nov;411:131304. doi: 10.1016/j.biortech.2024.131304. Epub 2024 Aug 21.
Nano-bubble water (NBW) was applied to anaerobic digestion (AD) to alleviate volatile fatty acids (VFAs) inhibition, improve the buffering capacity and CH production in this work. Results indicated that NBW accelerated the consumption of VFAs and prevented inhibition due to VFAs accumulation. Additionally, NBW facilitated a rapid increase in partial alkalinity (PA) and total alkalinity (TA) as well as a corresponding rapid decrease in intermediate alkalinity (IA)/PA and VFA/TA, thereby improving buffering capacity and alleviating VFAs inhibition. Moreover, CH production improved by more than 12.2% by NBW. Similarly, the activities of the extracellular hydrolases and coenzyme F420 increased. Besides, NBW increased the abundance of microbial community and strengthened the metabolic pathways of hydrogenotrophic methanogens, which could be the intrinsic mechanism by which NBW alleviated VFAs inhibition, improved system stability, and increased CH production. This study demonstrates that NBW supplementation can be an effective method for mitigating frequent VFAs inhibition.
纳米气泡水 (NBW) 被应用于厌氧消化 (AD) 中，以缓解挥发性脂肪酸 (VFAs) 抑制、提高缓冲能力和 CH 产量。结果表明，NBW 加速了 VFAs 的消耗，防止了由于 VFAs 积累而导致的抑制。此外，NBW 促进了部分碱度 (PA) 和总碱度 (TA) 的快速增加，以及中间碱度 (IA)/PA 和 VFA/TA 的相应快速下降，从而提高了缓冲能力并缓解了 VFAs 抑制。此外，NBW 使 CH 产量提高了 12.2%以上。同样，细胞外水解酶和辅酶 F420 的活性也增加了。此外，NBW 增加了微生物群落的丰度，并加强了产氢甲烷菌的代谢途径，这可能是 NBW 缓解 VFAs 抑制、提高系统稳定性和增加 CH 产量的内在机制。本研究表明，NBW 补充可以是缓解频繁 VFAs 抑制的有效方法。
