Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Bioresour Technol. 2022 Jan;344(Pt A):126190. doi: 10.1016/j.biortech.2021.126190. Epub 2021 Oct 26.
Thermophilic biological nitrogen removal will provide low-cost strategies for the treatment of high-temperature nitrogenous wastewater (greater than 45 ℃). In this study, a thermophilic denitrifying granular sludge system was established at 50 ℃ and compared with mesophilic systems (30 ℃ and 40 ℃). The results showed a significant increase in COD and nitrate removal rate with the elevating temperature. Besides, the microbial community analysis indicated an obvious succession of key functional bacteria at different temperatures. Enriched thermophiles including Truepera, Azoarcus, and Elioraea were the dominant denitrifiers in the thermophilic denitrifying granular sludge system, which ensured the high nitrate removal at 50 ℃. Moreover, the functional gene prediction also denoted an enrichment of nitrate reduction genes and carbon metabolism pathways at 50 ℃, which could explain the enhancement of thermophilic denitrification. These findings could provide new insight into the application of denitrifying granular sludge in thermophilic wastewater treatment.
嗜热生物脱氮将为高温含氮废水（大于 45℃）的处理提供低成本策略。本研究在 50℃下建立了一种嗜热反硝化颗粒污泥系统，并与中温系统（30℃和 40℃）进行了比较。结果表明，随着温度的升高，COD 和硝酸盐去除率显著提高。此外，微生物群落分析表明，在不同温度下关键功能细菌明显发生了演替。丰度较高的嗜热菌包括真杆菌属、脱氮副球菌属和伊奥拉菌属是嗜热反硝化颗粒污泥系统中的主要脱氮菌，这保证了在 50℃下的高硝酸盐去除率。此外，功能基因预测也表明，在 50℃时硝酸盐还原基因和碳代谢途径得到了富集，这可以解释嗜热反硝化的增强。这些发现为反硝化颗粒污泥在嗜热废水处理中的应用提供了新的见解。
