Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China; Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China.
Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China.
Bioresour Technol. 2021 Jun;329:124918. doi: 10.1016/j.biortech.2021.124918. Epub 2021 Mar 2.
Sulfur-driven autotrophic denitrification (SDAD) is feasible for the treatment of low-C/N-ratio and sulfur-laden wastewaters. The nitrite accumulated in SDAD will affect the performance and stability of the system but can be a potential electron acceptor. Thus, single- and multiple-electron acceptor-mediated SDAD systems were investigated. Batch assays revealed that nitrite and nitrate were the preferential options in the SDAD system with single and multiple electron acceptors, respectively. Synchronous nitrogen and sulfur removal was successfully achieved in continuous flow experiments with multiple electron acceptors, and the system could adapt well to high concentrations of sulfide, nitrate and nitrite (i.e., 720, 108 and 64.8 mg L, respectively), with the predominant genera shifting from Thiobacillus (48.88%) at the initial stage to unclassified_p_Firmicute (34.24%) and Syner-01 (12.31%) at the last stage. This work provides a fundamental basis for applying and regulating SDAD with multiple electron acceptors for the remediation of nitrogen- and sulfide- laden wastewaters.
硫驱动自养反硝化（SDAD）可用于处理低 C/N 比和含硫废水。SDAD 中积累的亚硝酸盐会影响系统的性能和稳定性，但可以作为一种潜在的电子受体。因此，研究了单电子和多电子受体介导的 SDAD 系统。批处理实验表明，在具有单电子和多电子受体的 SDAD 系统中，亚硝酸盐和硝酸盐分别是首选的电子受体。在多电子受体连续流实验中成功实现了同步氮和硫的去除，该系统可以很好地适应高浓度的硫化物、硝酸盐和亚硝酸盐（即分别为 720、108 和 64.8 mg/L），优势菌从初始阶段的硫杆菌（48.88%）转变为未分类的Firmicute（34.24%）和 Syner-01（12.31%）。这项工作为应用和调控具有多电子受体的 SDAD 修复含氮和含硫废水提供了基础。
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