School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
Bioresour Technol. 2024 Jun;402:130800. doi: 10.1016/j.biortech.2024.130800. Epub 2024 May 9.
A sulfur-iron coupled ecological floating bed (EFB-SFe) was developed to enhance the denitrification capability of sulfur-based ecological floating beds (EFB-S). The denitrification performance, kinetic process and microbial community composition were explored. Results showed that sulfur-iron coupling effectively enhanced the denitrification performance of EFB, surpassing the sum of their individual effects. The average total nitrogen removal rate ranged from 1.56 to 4.56 g·m·d, with a removal efficiency of 22-84 %. The k value for the S + Fe group increased from 0.04 to 0.18 d to 0.40-0.46 d relative to the S group. The sulfur-iron coupling promoted the enrichment of denitrifying bacteria (Thiobacillus and Ferritrophicum). The denitrification genes in EFB-SFe were upregulated, being 12-22 times more abundant than in EFB-S. Sulfur and iron autotrophic denitrification were identified as the main nitrogen removal processes in EFB-SFe. Overall, sulfur-iron coupling showed the potential to enhance the denitrification capacity of EFB-S for treating low-pollution water.
开发了一种硫铁耦合生态浮床（EFB-SFe）以提高基于硫的生态浮床（EFB-S）的脱氮能力。探讨了其脱氮性能、动力学过程和微生物群落组成。结果表明，硫铁偶联有效地增强了 EFB 的脱氮性能，超过了它们各自作用的总和。平均总氮去除率范围为 1.56 至 4.56 g·m·d，去除效率为 22-84%。与 S 组相比，S + Fe 组的 k 值从 0.04 增加到 0.18 d 到 0.40-0.46 d。硫铁偶联促进了反硝化菌（硫杆菌和铁营养菌）的富集。EFB-SFe 中的脱氮基因被上调，丰度是 EFB-S 的 12-22 倍。硫和铁自养反硝化被确定为 EFB-SFe 中主要的氮去除过程。总的来说，硫铁偶联显示出了提高 EFB-S 处理低污染水的脱氮能力的潜力。
