Simultaneous removal of typical antibiotics and nitrogen by SWIS assisted by iron carbon micro-electrolysis

In this study, a combination of subsurface wastewater infiltration system (SWIS) with iron carbon micro-electrolysis (namely ICMESWIS) was used to enhance the simultaneous removal of nitrogen and typical antibiotics (SMX, OTC and HCl-Lev was selected). The results indicated that assisted by 10 % dopant amount of ICME, SMX, OTC, Lev-HCl, NH 4 + -N, NO 3 - -N and NO 2 - -N removal rates increased by 26.6 %, 19.7 %, 10.2 %, 33.7 %, 28.5 % and 19.3 %, respectively via ICMESWIS than SWIS. The higher TFe release rate, organic matter content and richer microbial populations encouraged ICMESWIS to resist the impact of antibiotics. High-throughput sequencing revealed that electrochemical effect enhanced the microbial community structure, which was the main pathway for nitrogen and antibiotics removal . The total proportions of nitrogen and antibiotics removal relating bacteria were 18.38 % and 46.67 %, 5.49 % and 4.72 % higher than those of SWIS, respectively. Anammox became an additional N removal way in ICMESWIS.