School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China; School of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
Environ Pollut. 2021 Jan 1;268(Pt B):115708. doi: 10.1016/j.envpol.2020.115708. Epub 2020 Sep 24.
Thiosulfate is frequently used as an energy source and electron donor in autotrophic denitrification (AD) for removing nitrate from wastewater. However, transforming pathways of SO in this process is unclear. Herein, the aim of this study is to explore possible transforming pathways of sulfur compounds in thiosulfate-based AD process. After measuring the variation of NO, NO, and various sulfur compounds such as S, SO, SO, acid volatile sulfide (AVS), and S in the presence and absence of SO, the variation process of SO and the contribution of various sulfur compounds were analyzed. The results indicated that S, AVS, and S were the intermediate products when SO was applied as an electron donor. All SO, S, AVS, and S could act as electron donors in the nitrate removal process with the final products of SO. The utilization priority of these four sulfur sources was presumed in the following order: S > SO > AVS ≈ S. Furthermore, sulfur transformation and balance in nitrate removal process was also investigated. This suggests the transforming pathways of sulfur compounds in denitrification process. Nitrogen removal and sulfur conversion process are dependent on the presence of microorganisms in the sludge.
硫代硫酸盐经常被用作自养反硝化（AD）中的能源和电子供体，以去除废水中的硝酸盐。然而，在此过程中硫的转化途径尚不清楚。本研究旨在探索硫代硫酸盐基 AD 工艺中硫化合物的可能转化途径。在测量了存在和不存在 SO 时 NO、NO 和各种硫化合物（如 S、SO、SO、酸可挥发性硫（AVS）和 S）的变化后，分析了 SO 的变化过程和各种硫化合物的贡献。结果表明，当 SO 用作电子供体时，S、AVS 和 S 是其中间产物。所有 SO、S、AVS 和 S 都可以在硝酸盐去除过程中作为电子供体，最终产物为 SO。这四种硫源的利用优先级被推测为：S>SO>AVS≈S。此外，还研究了硝酸盐去除过程中的硫转化和平衡。这表明了反硝化过程中硫化合物的转化途径。氮的去除和硫的转化过程依赖于污泥中微生物的存在。
