Author(s): Xiaojing Zhang
Linked Author(s): Xiaojing Zhang
Keywords: Perfluorooctanoic acid (PFOA) Nitrogen removal Anammox Biofilter Gene expression
Abstract: Perfluorooctanoic acid (PFOA) is an emerging pollutant and is frequently detected in nitrogenous wastewaters. In this study, the long-term impact of PFOA (0.001-1000 μg/L) on nitrogen removal, microbial community, functional genes of Anammox process, and PFOA migration were explored. Results showed that 1 ng/L of PFOA slightly influenced nitrogen removal, but stimulated the growth of anaerobic ammonia-oxidizing bacteria (AAOB) as stress response. 0.1-1000 μg/L continuously suppressed nitrogen removal, but then the reactor showed a recovery due to the adaption. PFOA was mainly adsorbed into the biofilm, and maximum adsorption was achieved when exposed to 1 μg/L PFOA. After that, the system up-regulated AAOB abundance and gene expression as a protective strategy, and the genes of nitrite oxidation (narG) and nitrite reduction (nirS and nirK) both increased. Generally, PFOA had slight impact on the functional prediction and metabolic, denitrification and nitrification bacteria should be washed out when treating wastewater contains PFOA
Year: 2025