College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.
Melbourne School of Engineering, The University of Melbourne, Grattan Street, Parkville Victoria, Melbourne, 3010, Australia.
Appl Biochem Biotechnol. 2020 Sep;192(1):313-324. doi: 10.1007/s12010-020-03339-1. Epub 2020 May 6.
An emerging contaminant, micron-sized zero valent iron (mZVI) has been reported to be accumulated in waste activated sludge (WAS). In the present study, the potential effects of mZVI on WAS anaerobic fermentation performance, as well as the shift of the microbial community composition and function, were assessed. Results from batch experiments indicated that a particular concentration of mZVI (1.5 g/L, in the range of 0.0 to 5.0 g/L) improved volatile fatty acids (VFA) accumulation by 4.84 times that in the control group, the ability (dosage dependent) to remove phosphorus, and the dewaterability of fermented WAS from 126 ± 5 s (control group) to 104 ± 3 s (group with 1.5 g/L mZVI). Furthermore, high-throughput sequencing revealed that mZVI had no significant impact on the shift of microbial community structure, but directly stimulated the functional performance related to anaerobic fermentation. This study will provide new insights into the mZVI application and its effect on WAS utilization.
一种新兴的污染物，即纳米零价铁（mZVI）已被报道在废活性污泥（WAS）中积累。在本研究中，评估了 mZVI 对 WAS 厌氧发酵性能的潜在影响，以及微生物群落组成和功能的变化。批处理实验结果表明，特定浓度的 mZVI（1.5 g/L，范围为 0.0 至 5.0 g/L）使挥发性脂肪酸（VFA）的积累提高了 4.84 倍，比对照组高，同时 mZVI（1.5 g/L）还具有剂量依赖性去除磷的能力，以及发酵后的 WAS 的脱水性能，从 126±5 s（对照组）降至 104±3 s（添加 1.5 g/L mZVI 的组）。此外，高通量测序表明，mZVI 对微生物群落结构的变化没有显著影响，但直接刺激了与厌氧发酵相关的功能性能。本研究将为 mZVI 的应用及其对 WAS 利用的影响提供新的见解。
