LUOPei-wen,LIWei,DINGJie,et al.Biological Denitrification of Low Carbon to Nitrogen Ratio Wastewater Enhanced by Iron Oxyhydroxide[J].China Water & Wastewater,2022,38(11):19-24.
羟基氧化铁强化低C/N废水生物反硝化脱氮研究
- Title:
- Biological Denitrification of Low Carbon to Nitrogen Ratio Wastewater Enhanced by Iron Oxyhydroxide
- 关键词:
- 羟基氧化铁; 反硝化; 铁循环; 硝酸盐型厌氧亚铁氧化
- 摘要:
- 针对处理低C/N废水过程中传统生物反硝化效率低的技术难题，在活性污泥反硝化系统中投加羟基氧化铁，研究羟基氧化铁对C/N逐渐降低废水反硝化效率的影响。结果表明，在C/N为10、7.5时，羟基氧化铁对硝态氮去除率的影响不明显；当C/N为5、2.5时，投加羟基氧化铁可使硝态氮去除率分别提高16.38%和15.76%，同时加快了系统对反硝化中间产物亚硝态氮的去除。另外，投加羟基氧化铁还促进了胞外聚合物（EPS）中蛋白质（PN）和多糖（PS）的分泌，降低了传统反硝化亚硝酸还原酶（NIR）的活性。羟基氧化铁可以改变微生物的群落结构，使系统能够富集Uncultured_bacterium_f_Gemmatimonadaceae和Neochlamydia等脱氮菌，诱导发生硝酸盐型厌氧亚铁氧化，实现传统反硝化和硝酸盐型厌氧亚铁氧化协同去除硝态氮。
- Abstract:
- To solve the problem of low denitrification efficiency of traditional biological process for the treatment of low carbon to nitrogen (C/N) ratio wastewater, iron oxyhydroxide was added into an activated sludge system to investigate its effect on the denitrification efficiency of wastewater with a gradually decreasing C/N ratio. When the C/N ratio was 10 and 7.5, the effect of iron oxyhydroxide on nitrate removal efficiency was not obvious. When the C/N ratio was 5 and 2.5, the addition of iron oxyhydroxide increased the nitrate removal efficiency by 16.38% and 15.76%, respectively, and the removal rate of nitrite (an intermediate produced in denitrification) was accelerated. In addition, iron oxyhydroxide also promoted the secretion of protein and polysaccharide in EPS, and decreased the activity of nitrite reductase (NIR) enzyme. Iron oxyhydroxide changed the microbial community composition, enriched denitrifying bacteria such as Uncultured_bacterium_f_Gemmatimonadaceae and Neochlamydia in the system, induced nitrate?dependent Fe(Ⅱ) oxidation, and realized synergistic removal of nitrate nitrogen through traditional denitrification and nitrate-dependent Fe(Ⅱ) oxidation.
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