School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Sci Total Environ. 2021 Jan 10;751:141703. doi: 10.1016/j.scitotenv.2020.141703. Epub 2020 Aug 15.
Ammonium removal in wastewater treatment plants requires a large number of energy input, such as aeration and the addition of organics. Alternative, more economical technologies for nitrogen removal from wastewater are required. This study comprehensively investigated the feasible of microbial electricity coupled with Fe(III) reduction promoting the anaerobic ammonium removal. It was found that electrostimulation coupled with Fe(III) reduction (bioelectrochemical systems-Fe(III) (BES-Fe(III)) reactor) enhanced the anaerobic ammonium removal by 50.38% and 38.8% compared with the BES reactor and Fe(III) reactor, respectively. The ammonium removal rate reached the highest value of 80.62 ± 0.26 g N m·d in the Fe(III)-BES reactor comparable to conventional wastewater treatment plants (WWWTPs). The improvement of ammonium removal might be the synergistic effect of BES and Feammox process on reaction process and microorganisms. Firstly, the addition of FeO could improve the electrochemical characteristics by enriching iron-reducing bacterial (FeRB). Secondly, the improved ammonium removal could be due to nitrite generated from Feammox process driving the anodic ammonium oxidation. Additionally, the ammonium removal improvement might be the effect of BES on the Fe leaching so as to accelerate the Fe (II)/Fe(III) cycle. In agreement, higher abundance of FeRB and iron-oxidizing bacteria was detected in the Fe(III)-BES reactor. This study provides a lower energy consumption and operational cost technology compared with the conventional partial nitrification/denitrification, which was more than 800 times less than for the conventional wastewater treatment.
在废水处理厂中去除氨氮需要大量的能源投入，如曝气和添加有机物。需要替代的、更经济的废水脱氮技术。本研究全面考察了微生物电化学耦合 Fe(III)还原促进厌氧氨氧化的可行性。结果发现，与 BES 反应器和 Fe(III)反应器相比，电刺激耦合 Fe(III)还原（生物电化学系统- Fe(III)（BES-Fe(III)）反应器）分别提高了 50.38%和 38.8%的厌氧氨氧化去除率。在 Fe(III)-BES 反应器中，氨氮去除率达到了 80.62 ± 0.26 g N m·d，与传统废水处理厂（WWWTPs）相当。氨氮去除率的提高可能是 BES 和 Feammox 工艺对反应过程和微生物的协同作用。首先，添加 FeO 可以通过富集铁还原菌（FeRB）来改善电化学特性。其次，氨氮去除率的提高可能是由于 Feammox 过程产生的亚硝酸盐驱动阳极氨氧化。此外，BES 对 Fe 浸出的促进可能是氨氮去除率提高的原因，从而加速 Fe(II)/Fe(III)循环。同样，在 Fe(III)-BES 反应器中检测到更高丰度的 FeRB 和铁氧化菌。与传统的部分硝化/反硝化相比，本研究提供了一种能耗和运行成本更低的技术，比传统废水处理低 800 多倍。
