Zhang Dejin, Lu Peng, Zhang Mingjiang, Wei Yidan, Liang Jianru, Zhou Lixiang
Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
J Biosci Bioeng. 2023 Jan;135(1):63-70. doi: 10.1016/j.jbiosc.2022.10.003. Epub 2022 Nov 4.
In our previous study, anaerobic digestion of food waste could be effectively enhanced by adding sulfidated nanoscale zero-valent iron (S-nZVI) under high-strength ammonia concentrations. In this study, in order to further elucidate the specific interactive effects of S-nZVI and ammonia on anaerobic digestion of nitrogen-rich food waste, the methanogenic performance of anaerobic digestion systems respectively added with nanoscale zero-valent iron (nZVI) and S-nZVI were compared and monitored under different ammonia stress conditions. Both nZVI and S-nZVI could effectively stimulate the methanogenesis process among ammonia concentrations ranging from 0 to 3500 mg/L. However, the enhancing effects of S-nZVI and nZVI on anaerobic digestion of food waste were different, in which anaerobic digestion systems added with S-nZVI and nZVI performed best under 2500 mg/L of ammonia and 1500 mg/L of ammonia, respectively. Furthermore, the analysis of microbial communities suggested that ammonia stress enriched acetoclastic methanogens, while adding nZVI and S-nZVI into anaerobic digestions stimulated the process of hydrogenotrophic methanogenesis. Moreover, S-nZVI performed better in promoting the evolution of DIET-related microorganisms than nZVI, resulting in enhanced methane production under high ammonia-stressed conditions. This work provided fundamental knowledge about the interactive effects of S-nZVI and ammonia on the anaerobic digestion of food waste.
在我们之前的研究中，在高浓度氨条件下添加硫化纳米零价铁（S-nZVI）可有效促进食物垃圾的厌氧消化。在本研究中，为了进一步阐明S-nZVI和氨对富氮食物垃圾厌氧消化的具体交互作用，在不同氨胁迫条件下，对分别添加纳米零价铁（nZVI）和S-nZVI的厌氧消化系统的产甲烷性能进行了比较和监测。在氨浓度为0至3500mg/L范围内，nZVI和S-nZVI均能有效刺激产甲烷过程。然而，S-nZVI和nZVI对食物垃圾厌氧消化的增强作用有所不同，其中添加S-nZVI和nZVI的厌氧消化系统分别在氨浓度为2500mg/L和1500mg/L时表现最佳。此外，微生物群落分析表明，氨胁迫使乙酸营养型产甲烷菌富集，而在厌氧消化中添加nZVI和S-nZVI则刺激了氢营养型产甲烷过程。此外，在促进与直接种间电子传递（DIET）相关微生物的演化方面，S-nZVI比nZVI表现更好，从而在高氨胁迫条件下提高了甲烷产量。这项工作提供了关于S-nZVI和氨对食物垃圾厌氧消化交互作用的基础知识。
