环境工程学报2024，Vol.18Issue(4)：1104-1112,9.DOI:10.12030/j.cjee.202310021
纳米Fe2O3强化MBF生物巢脱氮的机制
Augmentation of nitrogen removal by MBF bio-nests supplemented with nano-Fe2O3
摘要
Abstract
Addressing the issue of low C/N ratio in municipal wastewater in China,this study aims to investigate the enhanced nitrogen removal efficacy and its mechanism of nano-iron oxide in an MBF bio-nest reactor treating municipal wastewater with low C/N ratio.As nano-iron oxide was added to the MBF bio-nest treating actual municipal wastewater with low C/N ratio,the nitrogen removal efficiency and carbon source utilization were monitored,and the microbial community structure and functional gene expression levels were also analyzed,then the performance on treating wastewater with low C/N ratio was evaluated.The results showed that addition of nano-iron oxide significantly increased the nitrogen removal efficiency of the reactor by 58％.Microbial community structure analysis revealed that nano-iron oxide affected the relative abundance of specific nitrogen-removing microorganisms.Functional gene expression analysis found that nano-iron oxide downregulated the expression of electron transfer proteins on the outer membrane of microorganisms,reducing interspecies electron transfer and thereby enhancing the effective utilization of electrons within the cells.Above results indicated that nano-iron oxide increased the efficiency of carbon source utilization and effectively removed nitrogen from municipal wastewater with low C/N ratio through regulating microbial community structure and functional gene expression.This provides a new technical approach for municipal wastewater treatment.关键词
纳米氧化铁/生物巢/生物接触氧化反应器/低C/N污水/脱氮效率Key words
nano-iron oxide/biological nest/biological contact oxidation reactor/low carbon-to-nitrogen ratio sewage/denitrification efficiency分类
环境科学引用本文复制引用
李婉蒙,李姗蔚,吴智仁,周向同,徐保荐,孙朋,黄婷,王晓,梁止水,杨菲,刘志刚,韦静..纳米Fe2O3强化MBF生物巢脱氮的机制[J].环境工程学报,2024,18(4):1104-1112,9.基金项目
青海省科技厅重点研发与转化计划项目(2022-SF-137) （2022-SF-137）
江苏水处理技术与材料协同创新中心项目(XTCXSZ2020-4) （XTCXSZ2020-4）
