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Comparative analysis of sulfur-driven autotrophic denitrification for pilot-scale application: Pollutant removal performance and metagenomic function
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-09-03 , DOI: 10.1016/j.biortech.2024.131433
Peng Cui 1 , Nianhong Wan 1 , Chaoyu Li 2 , Lei Zou 1 , Min Ma 3 , Jing Du 3 , Yu Jiang 2
Affiliation  

Two parallel pilot-scale reactors were operated to investigate pollutant removal performance and metabolic pathways in elemental sulfur-driven autotrophic denitrification (SDAD) process under low temperature and after addition of external electron donors. The results showed that low temperature slightly inhibited SDAD (average total nitrogen removal of ∼4.7 mg L−1) while supplement of sodium thiosulfate (stage 2) and sodium acetate (stage 3) enhanced denitrification and secretion of extracellular polymeric substances (EPS), leading to the average removal rate of 0.75 and 1.01 kg N m−3 d−1, respectively with over twice higher total EPS. Correspondingly, nitrogen and sulfur related microbial metabolisms especially nitrite reductase and nitric oxide reductase encoding were promoted by genera including Thermomonas and Thiobacillus. The variations revealed that extra sodium acetate improved denitrification and enriched more SDAD-related microorganisms compared with sodium thiosulfate, which potentially catalyzed the refinement of practical strategies for optimizing denitrification in low carbon to nitrogen ratio wastewater treatment.

中文翻译:


用于中试规模应用的硫驱动自养反硝化作用的比较分析:污染物去除性能和宏基因组功能



运行两个平行的中试规模反应器,以研究元素硫驱动的自养反硝化 (SDAD) 过程中在低温和添加外部电子供体后的污染物去除性能和代谢途径。结果表明,低温略微抑制了 SDAD(平均总氮去除量约为 4.7 mg L-1),而补充硫代硫酸钠(第 2 阶段)和乙酸钠(第 3 阶段)增强了细胞外聚合物物质 (EPS) 的反硝化和分泌,导致平均去除率分别为 0.75 和 1.01 kg N m-3 d-1,总 EPS 高出两倍多。相应地,氮和硫相关的微生物代谢,尤其是亚硝酸盐还原酶和一氧化氮还原酶编码被包括热单胞菌属和硫杆菌属在内的属促进。这些变化表明,与硫代硫酸钠相比,额外的乙酸钠改善了反硝化作用并富集了更多与 SDAD 相关的微生物,这可能促进了在低碳氮比废水处理中优化反硝化的实用策略的改进。
更新日期:2024-09-03
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