Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian, Liaoning 116024, China.
Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, PR China.
Environ Pollut. 2019 Apr;247:973-979. doi: 10.1016/j.envpol.2019.02.008. Epub 2019 Feb 4.
Feammox, i.e., Fe(III) reduction coupled to anaerobic ammonium oxidation, is a potential alternative to ammonium removal in natural and artificial ecosystems. However, the efficiency of Feammox is quite low to restrain its practical application in wastewater/solid disposal. In this study, three batch experiments, including control (FeO/AQDS-free), FeO group (25 mM FeO only) and AQDS-FeO group (25 mM FeO and 0.6 mM AQDS), were conducted in 200 mL serum vials to explore whether AQDS can promote Feammox. Results showed that the nitrogen removal efficiency of the AQDS-FeO group was 82.6%, compared with 64.3% of the FeO group and 46.0% in the control. AHQDS, the reduced state of AQDS, was detected in the AQDS-FeO group. Another experiment indicated that AHQDS was oxidized back to AQDS by FeO. These results suggested that AQDS/AHQDS had been serving as electron shuttles between ammonium and FeO to successively forward the oxidation of NH. X-ray diffraction analysis showed that new Fe(III) species were found in the systems, implying that a Fe(II)/Fe(III) cycle also occurred. In agreement, both iron-reducing and oxidizing bacteria were detected in the systems.
铁氨单加氧（Feammox），即三价铁还原耦合厌氧氨氧化，是自然和人工生态系统中替代氨去除的一种潜在方法。然而，由于 Feammox 的效率相当低，限制了其在废水/固体废物处理中的实际应用。在这项研究中，进行了三组批实验，包括对照（无 FeO/AQDS）、FeO 组（仅 25mM FeO）和 AQDS-FeO 组（25mM FeO 和 0.6mM AQDS），以探究 AQDS 是否能促进 Feammox。结果表明，AQDS-FeO 组的氮去除效率为 82.6%，而 FeO 组为 64.3%，对照组为 46.0%。AQDS-FeO 组中检测到 AQDS 的还原态 AHQDS。另一个实验表明，FeO 将 AHQDS 氧化回 AQDS。这些结果表明，AQDS/AHQDS 一直作为铵和 FeO 之间的电子穿梭体，使 NH4+ 的氧化连续进行。X 射线衍射分析表明，体系中发现了新的三价铁物种，这意味着也发生了一个 Fe(II)/Fe(III) 循环。同样，在体系中检测到了铁还原菌和铁氧化菌。
