Chen Sheng-Jie, Yao Fu-Bing, Pi Zhou-Jie, Hou Kun-Jie, He Li, Li Xiao-Ming, Wang Dong-Bo, Yang Qi
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China.
Huan Jing Ke Xue. 2021 Feb 8;42(2):891-899. doi: 10.13227/j.hjkx.202007035.
Focusing on low biogas yields in the anaerobic co-digestion of waste activated sludge and food waste, the enhancing effects and mechanisms of microscale zero valent iron (mZVI) on anaerobic co-digestion was investigated. The results indicated that the addition of mZVI enhanced the methanogenesis stage of co-digestion but had no significant effect on the solubilization, hydrolysis, and acidification stages. With a dosage of 10 g·L mZVI, the cumulative methane yield (based on VS) within 15 days reached 238.68 mL·g, which was 20.05% higher than the control group. The mechanism analysis showed that mZVI promoted electron transport system (ETS) activity (based on INTF/TS), which increased to 21.50 mg·(g·h) with 10 g·L mZVI compared to 13.43 mg·(g·h) in the control group. Furthermore, mZVI enhanced direct interspecies electron transfer (DIET) between specific bacteria and methanogens. Microbial community analysis demonstrated that the abundance of DIET-related microorganisms, such as , and , was higher in presence of mZVI.
针对剩余活性污泥与餐厨垃圾厌氧共消化过程中沼气产量较低的问题，研究了微尺度零价铁（mZVI）对厌氧共消化的强化效果及作用机制。结果表明，添加mZVI增强了共消化的产甲烷阶段，但对溶解、水解和酸化阶段无显著影响。当mZVI投加量为10 g·L时，15天内累积甲烷产量（基于挥发性固体）达到238.68 mL·g，比对照组高出20.05%。机理分析表明，mZVI促进了电子传递系统（ETS）活性（基于INTF/TS），投加10 g·L mZVI时ETS活性增至21.50 mg·(g·h)，而对照组为13.43 mg·(g·h)。此外，mZVI增强了特定细菌与产甲烷菌之间的直接种间电子传递（DIET）。微生物群落分析表明，在mZVI存在的情况下，与DIET相关的微生物如 、 和 的丰度更高。
