This study investigated whether bioaugmentation improves sulfamethoxazole (SMX) degradation and nitrogen removal in the Moving Bed Biofilm Reactor (MBBR) system. The effects of the C/N ratio on SMX degradation and nitrogen removal were also evaluated. Using MBBR system operation experiments, the bioaugmented reactor was found to perform more effectively than the non-bioaugmentation reactor, with the highest SMX, nitrate-N, and ammonia-N removal efficiencies of 80.49, 94.70, and 96.09%, respectively. The changes in the sulfonamide resistance genes and bacterial communities were detected at various operating conditions. The results indicate that the diversity of the bacterial communities and the abundance of resistance genes were markedly influenced by bioaugmentation and the C/N ratio, with Achromobacter among the dominant genera in the MBBR system. The bio-toxicity of samples, calculated as the inhibition percentage (IP) toward Escherichia coli, was found to decrease to non-toxic ranges after treatment.

这项研究调查了生物强化是否可改善移动床生物膜反应器（MBBR）系统中的磺胺甲恶唑（SMX）降解和氮去除。还评估了C / N比对SMX降解和脱氮的影响。使用MBBR系统操作实验，发现生物强化反应器的性能比非生物强化反应器更有效，SMX，硝酸盐氮和氨氮的去除效率最高，分别为80.49％，94.70％和96.09％。在不同的操作条件下检测到磺酰胺抗性基因和细菌群落的变化。结果表明，无色杆菌的生物强化和C / N比对细菌群落的多样性和抗性基因的丰度有显着影响。在MBBR系统中占主导地位。发现样品的生物毒性以对大肠杆菌的抑制百分比（IP）计算，在处理后降低到无毒范围。