State Key Laboratory of Marine Environmental Science, College of Environment and Ecology, Xiamen University, Xiamen, China.
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan.
Water Environ Res. 2021 Sep;93(9):1651-1659. doi: 10.1002/wer.1549. Epub 2021 Mar 15.
Fe(II) is one of the commonly used additives in wastewater treatment and proved to be beneficial for promoting microbial activity. In this study, the effects of Fe(II) on the specific anammox activity (SAA) and reactor performance were proved to be concentration-dependent. In the short-term experiment, low concentration of Fe(II) (5-80 mg/L) significantly enhanced the SAA, while high concentration of Fe(II) (120-300 mg/L) inhibited the SAA. It was confirmed that anammox can be domesticated after long-term exposure to low Fe(II) concentration, and the SAA could be further enhanced by higher Fe(II) concentration in the following phases. In addition, as an important factor for anammox granulation and maintaining the SAA, the extracellular polymeric substance (EPS) was also affected by Fe(II) addition. In spite of the effects on SAA and EPS, Fe(II) was proved to be the key factor that enhances the N O emission via abiotic pathway in the anammox reactor. PRACTITIONER POINTS: Low Fe(II) concentrations enhanced SAA, while high concentrations inhibited SAA. Long-term acclimatization by Fe(II) improved the tolerance of anammox to Fe(II). Fe(II) affects the amount and constituent of EPS and the performance of anammox granules. Accumulation of Fe(II) in the AAFEB reactor promoted the N O emission.
亚铁（Fe(II)）是废水处理中常用的添加剂之一，被证明有利于促进微生物活性。在本研究中，Fe(II)对特定厌氧氨氧化活性（SAA）和反应器性能的影响被证明是浓度依赖性的。在短期实验中，低浓度的 Fe(II)（5-80mg/L）显著提高了 SAA，而高浓度的 Fe(II)（120-300mg/L）则抑制了 SAA。证实了在长期暴露于低 Fe(II)浓度下，厌氧氨氧化菌可以被驯化，并且在随后的阶段中，较高的 Fe(II)浓度可以进一步提高 SAA。此外，作为厌氧氨氧化颗粒化和维持 SAA 的重要因素，胞外聚合物（EPS）也受到 Fe(II)添加的影响。尽管 Fe(II)对 SAA 和 EPS 有影响，但它被证明是通过厌氧氨氧化反应器中的非生物途径增强 N O 排放的关键因素。
低浓度的 Fe(II)提高了 SAA，而高浓度则抑制了 SAA。
通过 Fe(II)进行长期驯化提高了厌氧氨氧化菌对 Fe(II)的耐受性。
Fe(II)影响 EPS 的数量和组成以及厌氧氨氧化颗粒的性能。
AAFEB 反应器中 Fe(II)的积累促进了 N O 的排放。
