Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Bioresour Technol. 2021 Aug;333:125131. doi: 10.1016/j.biortech.2021.125131. Epub 2021 Apr 7.
Anaerobic digestion (AD) of ammonia-rich swine manure (SM) with nano-bubble water (NBW) supplementation was studied in this work with the expectation of ammonia inhibition alleviation, buffering capacity promotion, and methane production enhancement. Results indicated that cumulative methane yield was elevated by 12.3-38.7% in NBW groups. Besides, the reduced methane production rate and elongated lag phase under ammonia inhibition were increased and shortened by NBW supplementation, respectively. The rapid increase of total alkalinity (TA) and partial alkalinity (PA) could be observed with NBW supplementation, as well as the rapid decline of VFA/TA, thus improved buffering capacity and alleviated ammonia inhibition. Moreover, higher level of extracellular hydrolases and coenzyme F could be detected in NBW groups. In conclusion, NBW with higher mobility and zeta potential (absolute value) could be a promising strategy for the alleviation of ammonia suppression during the AD of SM.
本研究采用纳米气泡水（NBW）对富含氨的猪粪（SM）进行厌氧消化，以期缓解氨抑制、提高缓冲能力和增强甲烷生成。结果表明，NBW 组的累积甲烷产量提高了 12.3-38.7%。此外，NBW 补充可分别增加和缩短氨抑制下的甲烷生成率降低和迟滞期延长。NBW 补充后可观察到总碱度（TA）和部分碱度（PA）的快速增加，以及 VFA/TA 的快速下降，从而提高了缓冲能力并缓解了氨抑制。此外，NBW 组可检测到更高水平的细胞外水解酶和辅酶 F。总之，具有更高迁移率和 ζ 电位（绝对值）的 NBW 可能是缓解 SM 厌氧消化过程中氨抑制的一种有前途的策略。
