Ren Min, Wang Yuqi, Zhang Huining, Li Yan, Sun Keying
Marine Environmental Monitoring Centre of Ningbo, Ningbo 315100, China.
School of Civil Engineering, NingboTech University, Ningbo 315100, China.
Toxics. 2024 Oct 13;12(10):742. doi: 10.3390/toxics12100742.
In the process of flue gas desulfurization and denitrification, the generation of high-sulfate wastewater containing nitrogen is a significant challenge for biological wastewater treatment. In this study, halophilic activated sludge was inoculated in a Sequencing Batch Reactor to remove nitrogen from wastewater with a high sulfate concentration (60 g/L). With the influent concentration of 180 mg/L, the removal rate of total nitrogen was more than 96.7%. The effluent ammonium nitrogen concentration was lower than 1.94 mg/L, and the effluent nitrate nitrogen and nitrite nitrogen concentrations were even lower than 0.77 mg/L. The salt tolerance of activated sludge is mainly related to the increase in the content of ectoine in microbial cells. The Specific Nitrite Oxidation Rate is quite low, while the Specific Nitrite Reduction Rate and Specific Nitrate Reduction Rate are relatively strong. In the system, there are various nitrogen metabolic processes, including aerobic nitrification, anaerobic denitrification, and simultaneous nitrification-denitrification processes. By analyzing the nitrogen metabolic mechanisms and microbial community structure of the reaction system, dominate bacteria can be identified, such as , , and , which have significant nitrogen removal capabilities.
在烟气脱硫脱硝过程中，含氮高硫酸盐废水的产生对生物废水处理而言是一项重大挑战。在本研究中，嗜盐活性污泥被接种于序批式反应器中，以去除高硫酸盐浓度（60 g/L）废水中的氮。进水浓度为180 mg/L时，总氮去除率超过96.7%。出水氨氮浓度低于1.94 mg/L，而出水硝酸盐氮和亚硝酸盐氮浓度甚至低于0.77 mg/L。活性污泥的耐盐性主要与微生物细胞中四氢嘧啶含量的增加有关。亚硝酸盐比氧化速率相当低，而亚硝酸盐比还原速率和硝酸盐比还原速率相对较强。在该系统中，存在多种氮代谢过程，包括好氧硝化、厌氧反硝化以及同步硝化反硝化过程。通过分析反应系统的氮代谢机制和微生物群落结构，可鉴定出具有显著脱氮能力的优势细菌，如 、 和 。
