WU Qing,JIA Yan,CUI Yan-rui,et al.Effects of BAC on N2O Production during Biological Nitrogen Removal Process in SBR under Different C/N Ratios[J].China Water & Wastewater,2021,37(9 9):33-39.
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Effects of BAC on N2O Production during Biological Nitrogen Removal Process in SBR under Different C/N Ratios

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 9 9 Page: 33-39 Column: Date of publication: 2021-05-01
Author(s):
WU Qing1; 2; 3; JIA Yan1; 2; 3; CUI Yan-rui1; 2; 3; BAO Lin-lin1; 2; 3; MA Kai-li1; 2; 3; KANG Wei1; 2; 3; ZHANG Heng-tao4; ZOU Xu-yan4
(1. Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control , School of Environment, Henan Normal University, Xinxiang 453007, China； 2. Henan Key Laboratory of Environmental Pollution Control, Henan Normal University, Xinxiang 453007, China； 3. Henan Province International Joint Laboratory on Key Techniques in Water Treatment, Henan Normal University, Xinxiang 453007, China； 4. China Petroleum Pipeline Engineering Corporation, Langfang 065000, China)
Keywords:
biological activated carbon(BAC); sequencing batch reactor(SBR); simultaneous nitrification and denitrification (SND); N2O; C/N ratio
Abstract:
In order to investigate the effects of biological activated carbon (BAC) on N2O production in biological nitrogen removal process for different C/N ratio wastewater,activated carbon was added to sequencing batch reactor (SBR) to form BAC-SBR (SBRBAC), and compared with activated sludge SBR (SBRAS). At room temperature of 15-27 ℃, methanol was used as the carbon source to prepare artificial wastewater, the influent C/N ratio was adjusted to be 3, 6 and 9 respectively, and the two reactors were operated simultaneously. The concentrations of N2O,NH4+-N，NO3--N，NO2--N and TN were measured. And also the mechanism of BAC affecting N2O production was analyzed. The experimental results showed that when DO in mixed liquid was controlled at 2.0-3.0 mg/L, and C/N ratio was 3, BAC had no effect on N2O production; when the C/N ratio was 6, BAC could reduce N2O production; and when the C/N ratio was 9, BAC led to an increase in N2O concentration. The presence of BAC promoted simultaneous nitrification and denitrification (SND), which affected the production of N2O; C/N ratio of wastewater was an important factor that affected the effect of denitrification and N2O. The complex reaction environment at the inflection point of COD decline provided the necessary conditions for SND, and BAC could strengthen the reaction conditions at this inflection point.
Last Update: 2021-05-01