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The Performance of Anaerobic Ammonium Oxidation Coupled to Iron Reduction in Constructed Wetland Mesocosms

Speaker: Weitao Shuai, Graduate Student
Series: EEWR Brown Bag Seminars
Location: Engineering Quad E225
Date/Time: Friday, April 28, 2017, 12:00 p.m. - 1:00 p.m.

Abstract:

Ammonium removal is an essential objective in wastewater treatment. Nitrification followed by denitrification has been used as the conventional ammonium removal technology in current wastewater treatment plants. However, the aeration process required by nitrification makes this approach energy intensive, and the nitrogen removal ability in passive systems such as constructed wetlands (CW) is also limited by the oxygen transfer in the sediments. Anaerobic ammonium oxidation coupled to iron reduction, also known as Feammox process, is a novel process that can be carried out by an Acidimicrobiaceae bacterium A6 (Huang and Jaffe, 2013; Huang et al, 2016). The application of Feammox process in constructed wetlands would be able to reduce the cost by aeration and treat the non-point agricultural runoff which is typically high in ammonium concentration. However, the properties concerning the performance of Feammox process in CW remain unclear. To characterize and enhance the Feammox process in CW systems, CW mesocosms inoculated with Feammox bacterium A6 and fed with high ammonium nutrient solution were investigated in this study. The CW mesocosm with higher initial iron level showed larger ability of removing ammonium from the inflow and higher abundance in A6 gene copies than the CW mesocosm with lower initial iron level. The results indicated that the performance of Feammox process in terms of ammonium removal could be enhanced by supplementing iron source in constructed wetlands, which means the application of Feammox process in CW with sediments containing high iron concentration is promising.