Afroze Niema, Nakhla George, Kim Mingu, Yazdanpanah Andisheh
Civil and Environmental Engineering, University of Western Ontario, London, ON, Canada.
Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada.
Environ Technol. 2023 Nov;44(27):4157-4172. doi: 10.1080/09593330.2022.2082324. Epub 2022 Jun 16.
Trace elements (TE), as micronutrients for microorganisms, have a significant impact on the stability of anaerobic digestion (AD). Studies have been conducted on process stability and performance of the AD of food waste (FW) by supplementing TEs. In this study, mesophilic batch biomethane potential (BMP) tests using FW were conducted to investigate the effect of TEs (Fe, Ni, Co, Se, and Mo) as single and mixed ions. In view of their scarcity, correlations between the microbial community and digester performance such as first-order hydrolysis coefficient (K), volatile fatty acids (VFA), methane yield, and methane production rate (MPR) have been developed. Ni at 1 and 1.5 mg/L increased the methane yield by 27% and 23% respectively. Similarly, Co at 0.1 and 0.5 mg/L increased the yield by 21% and 23% respectively, compared to control. Although Se at all concentrations enhanced the methane yield, Fe at only 50 mg/L increased methane yield by 22%. For mixed TEs, the combination of Ni [1 mg/L] +Co was the best and increased methane for all Co concentrations (0.1, 0.4 and 0.5 mg/L) by 16%, 14% and 12% respectively. were the most abundant phyla among hydrolytic and methanogenic microbial groups, respectively, constituting 42%-61% and 60-80% of their respective microbial groups. The most significant positive correlations were observed between aceto/acidogenic microorganisms and final VFA concentrations with Pearson correlation factors of 0.91.
微量元素（TE）作为微生物的微量营养素，对厌氧消化（AD）的稳定性有重大影响。通过添加微量元素，已对食物垃圾（FW）厌氧消化的过程稳定性和性能进行了研究。在本研究中，进行了使用食物垃圾的嗜温批次生物甲烷潜力（BMP）测试，以研究作为单一离子和混合离子的微量元素（铁、镍、钴、硒和钼）的影响。鉴于它们的稀缺性，已建立了微生物群落与消化器性能之间的相关性，如一级水解系数（K）、挥发性脂肪酸（VFA）、甲烷产量和甲烷生产率（MPR）。1 mg/L和1.5 mg/L的镍分别使甲烷产量提高了27%和23%。同样，与对照相比，0.1 mg/L和0.5 mg/L的钴分别使产量提高了21%和23%。尽管所有浓度的硒都提高了甲烷产量，但仅50 mg/L的铁使甲烷产量提高了22%。对于混合微量元素，镍[1 mg/L]+钴的组合是最佳的，并且在所有钴浓度（0.1、0.4和0.5 mg/L）下分别使甲烷产量提高了16%、14%和12%。在水解和产甲烷微生物组中分别是最丰富的门类，分别占其各自微生物组的42%-61%和60%-80%。在乙酸/产酸微生物与最终挥发性脂肪酸浓度之间观察到最显著的正相关，皮尔逊相关系数为0.91。
