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.
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Biological Denitrification of Low Carbon to Nitrogen Ratio Wastewater Enhanced by Iron Oxyhydroxide

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第11期 Page: 19-24 Column: Date of publication: 2022-06-01
Author(s):
LUO　Pei-wen1;  LI　Wei1; 2;  DING　Jie1;  TANG　Jing-yao1;  ZHANG　Liu2;  YUAN　Bu-xian2;  LIANG　Yue-gan1
（1. School of Resources and Environment， Anhui Agricultural University， Hefei 230036， China； 2. Anhui Academy of Environmental Sciences， Hefei 230071， China）
Keywords:
iron oxyhydroxide;  denitrification;  iron cycle;  nitrate-dependent Fe(Ⅱ) oxidation
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.
Last Update: 2022-06-01