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.

中文翻译：

---

特定数量的微米级零价铁对废物活化污泥厌氧发酵的更强烈刺激。

据报道，一种新兴的污染物，微米级的零价铁（mZVI）积累在废物活性污泥（WAS）中。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。批处理实验的结果表明，特定浓度的mZVI（1.5 g / L，范围为0.0至5.0 g / L）可使挥发性脂肪酸（VFA）的积累提高了对照组的4.84倍，其能力（剂量依赖性） ）去除磷，使发酵后的WAS的脱水能力从126±5 s（对照组）降至104±3 s（1.5 g / L mZVI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着影响，但直接刺激了与厌氧发酵有关的功能性能。这项研究将为mZVI应用及其对WAS利用率的影响提供新的见解。