School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
Bioresour Technol. 2019 Dec;293:122061. doi: 10.1016/j.biortech.2019.122061. Epub 2019 Aug 25.
This study investigated sulfamethoxazole (SMX) biodegradation and nitrogen conversion by Achromobacter sp. JL9 using different carbon and nitrogen sources. Results showed that SMX and sodium acetate could be co-metabolized as carbon sources for bacterial growth and nitrogen conversion with highest removal efficiencies of 82.44%, 80.2%, and 79.45% for NH-N, NO-N, and SMX, respectively. Strain JL9 was able to utilize SMX as its sole nitrogen source for growth, with an SMX biodegradation efficiency of 63.10%. In addition, carbon and nitrogen balance analyses showed that approximately 35.31% and 63.22% of carbon and nitrogen, respectively, were lost as gaseous products. Finally, medium toxicity gradually decreased during the carbon and nitrogen dependence experiments. This study, thus, suggests that carbon and nitrogen play vital roles in SMX biodegradation and biotoxicity reduction.
本研究采用嗜甲基杆菌 JL9 考察了不同碳源和氮源条件下磺胺甲恶唑（SMX）的生物降解和氮转化。结果表明，SMX 和乙酸钠可作为细菌生长和氮转化的共代谢碳源，NH-N、NO-N 和 SMX 的去除率最高分别为 82.44%、80.2%和 79.45%。菌株 JL9 可将 SMX 作为唯一氮源进行生长，SMX 生物降解效率为 63.10%。此外，碳氮平衡分析表明，约 35.31%和 63.22%的碳和氮分别以气态产物的形式损失。最后，在碳氮依赖实验中，培养基毒性逐渐降低。因此，本研究表明，碳源和氮源在 SMX 的生物降解和生物毒性降低中起着至关重要的作用。
