Mechanism of nano-scale zero-valent iron modified biochar for enhancing low-nitrogen anammox process resistance to low temperatures

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Wenjing Chen , Lijin Zhang , Zirui Liu , Wenru Liu , Bin Lu , Haitao Zhao
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引用次数: 0

Abstract

Two anaerobic ammonia oxidation (anammox) systems, one with adding nano-scale zero-valent iron modified biochar (nZVI@BC) and the other with adding biochar, were constructed to explore the feasibility of nZVI@BC for enhancing the resistance of low-nitrogen anammox processes to low temperatures. The results showed that the average nitrogen removal efficiency with nZVI@BC addition at low temperatures was maintained at about 80%, while that with biochar addition gradually decreased to 69.49%. The heme-c content of biomass with nZVI@BC was significantly higher by 36.60%-91.45%. Additional, nZVI@BC addition resulted in more extracellular polymeric substances, better biomass granulation, and a higher abundance of anammox bacteria. In particularly, anammox genes hzsA/B/C, hzo and hdh played a pivotal role in maintaining nitrogen removal performance at 15°C. These findings suggest that nZVI@BC has the potential to enhance the resistance of low-nitrogen anammox processes to low temperatures, making it a valuable approach for practical applications in low-nitrogen and low-temperature wastewater treatment.

纳米级零价铁改性生物炭增强低氮厌氧工艺耐低温性的机理
构建了两个厌氧氨氧化(anammox)系统,一个是添加纳米级零价铁改性生物炭(nZVI@BC)的系统,另一个是添加生物炭的系统,以探索 nZVI@BC 增强低氮氨氧化过程耐低温能力的可行性。结果表明,在低温条件下,添加 nZVI@BC 的平均脱氮效率保持在 80% 左右,而添加生物炭的平均脱氮效率则逐渐下降至 69.49%。加入 nZVI@BC 后,生物质中的血红素-c 含量显著提高了 36.60%-91.45% 。此外,添加 nZVI@BC 后,细胞外高分子物质增多,生物质颗粒化效果更好,氨氧化细菌的数量也更多。特别是,anammox 基因 hzsA/B/C、hzo 和 hdh 在保持 15°C 脱氮性能方面发挥了关键作用。这些研究结果表明,nZVI@BC 有潜力提高低氮安默氧工艺对低温的耐受性,使其成为低氮、低温废水处理实际应用中的一种有价值的方法。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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