Investigation of Nitrogen Removal in Flue Gas Desulfurization and Denitrification Wastewater Utilizing Halophilic Activated Sludge.

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Toxics Pub Date : 2024-10-13 DOI:10.3390/toxics12100742
Min Ren, Yuqi Wang, Huining Zhang, Yan Li, Keying Sun
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Abstract

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 Azoarcus, Thauera, and Halomonas, which have significant nitrogen removal capabilities.

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利用嗜卤活性污泥去除烟气脱硫和脱硝废水中的氮的研究。
在烟气脱硫脱硝过程中,产生的高硫酸盐含氮废水是生物废水处理的一大挑战。本研究将嗜卤活性污泥接种到序批式反应器中,以去除高硫酸盐浓度(60 g/L)废水中的氮。当进水浓度为 180 mg/L 时,总氮的去除率超过 96.7%。出水铵态氮浓度低于 1.94 mg/L,出水硝态氮和亚硝态氮浓度甚至低于 0.77 mg/L。活性污泥的耐盐性主要与微生物细胞中外氨酸含量的增加有关。亚硝酸盐比氧化率相当低,而亚硝酸盐比还原率和硝酸盐比还原率相对较强。系统中存在多种氮代谢过程,包括好氧硝化、厌氧反硝化和硝化-反硝化同时进行的过程。通过分析反应系统的氮代谢机制和微生物群落结构,可以确定优势菌,如 Azoarcus、Thauera 和 Halomonas,它们具有显著的脱氮能力。
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来源期刊
Toxics
Toxics Chemical Engineering-Chemical Health and Safety
CiteScore
4.50
自引率
10.90%
发文量
681
审稿时长
6 weeks
期刊介绍: The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.
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