Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
Shanghai Honess Environmental tech Corp., 11 Guotai Road, Shanghai 200092, PR China.
Bioresour Technol. 2024 Aug;406:130968. doi: 10.1016/j.biortech.2024.130968. Epub 2024 Jun 13.
This study evaluated the reflection of long-term anaerobic system exposed to sulfate and propionate. Fe@C was found to efficiently mitigate anaerobic sulfate inhibition and enhance propionate degradation. With influent propionate of 12000mgCOD/L and COD/SO ratio of 3.0, methane productivity and sulfate removal were only 0.06 ± 0.02L/gCOD and 63 %, respectively. Fe@C helped recover methane productivity to 0.23 ± 0.03L/gCOD, and remove sulfate completely. After alleviating sulfate stress, less organic substrate was utilized to form extracellular polymeric substances for self-protection, which enhanced mass transfer in anaerobic sludge. Microbial community succession, especially for alteration of key sulfate-reducing bacteria and propionate-oxidizing bacteria, was driven by Fe@C, thus enhancing sulfate reduction and propionate degradation. Acetotrophic Methanothrix and hydrogenotrophic unclassified_f_Methanoregulaceae were enriched to promote methanogenesis. Regarding propionate metabolism, inhibited methylmalonyl-CoA degradation was a limiting step under sulfate stress, and was mitigated by Fe@C. Overall, this study provides perspective on Fe@C's future application on sulfate and propionate rich wastewater treatment.
本研究评估了长期暴露于硫酸盐和丙酸盐的厌氧系统的反应。Fe@C 被发现可有效缓解厌氧硫酸盐抑制并增强丙酸盐降解。当进水丙酸浓度为 12000mgCOD/L，COD/SO 比为 3.0 时，甲烷产量和硫酸盐去除率仅为 0.06±0.02L/gCOD 和 63%。Fe@C 帮助将甲烷产量恢复至 0.23±0.03L/gCOD，并完全去除硫酸盐。在缓解硫酸盐胁迫后，厌氧污泥中用于自我保护的有机基质较少用于形成胞外聚合物，从而增强了传质。微生物群落演替，特别是关键硫酸盐还原菌和丙酸盐氧化菌的变化，受到 Fe@C 的驱动，从而增强了硫酸盐还原和丙酸盐降解。乙酰营养型 Methanothrix 和氢营养型未分类_f_Methanoregulaceae 被富集以促进产甲烷作用。关于丙酸盐代谢，在硫酸盐胁迫下，抑制甲基丙二酰辅酶 A 降解是一个限制步骤，Fe@C 缓解了这一限制。总的来说，本研究为 Fe@C 在富含硫酸盐和丙酸盐的废水处理中的未来应用提供了新的视角。
