Effects of sulfamethoxazole on nitrogen removal and molecular ecological network in integrated vertical-flow constructed wetland

• DOI: 10.1016/j.ecoenv.2021.112292
• Publication Date: 2021-05-19T22:07:30Z
• Authors: Shaoyong Lu; Yaru Zhang; Xiaohui Liu; Jiamin Xu; Ying Liu; Wei Guo; Xianbin Liu; Jing Chen
• Keywords: Constructed wetland; Sulfamethoxazole; Nutrient pollution

Response of nitrogen removal efficiency and microbial interactions to organic pollution has been a major issue in wastewater treatment system. However, the among community under antibiotics press is still unclear. Thus, effect sulfamethoxazole (SMX) on responses IVCWs was investigated through recorded before after adding SMX random matrix theory (RMT)-based network analysis. Results showed that better NH4+-N (> 90%) long period operation were achieved IVCWs, but NO3--N accumulated. nitrate rates significantly increased long-term exposure (60 d) 100 μg L−1 (from 27.35% 35.57%) with relatively high (53.50%). Surprisingly, ammonia rate (90.07−92.70%) not affected by IVCWs. Moreover, bacterial richness decreased structures altered presence SMX, especially those nitrogen-transforming microorganisms. Molecular ecological analysis suggested had positive influences denitrifying bacteria reduced complexity whole molecular network, among-module connections weakened obviously at SMX.