Effect of carbon sources on nitrogen removal in denitrification process of rural wastewater
FU Kunming,, YANG Zongyue, LIU Fanqi, QIU Fuguo, CAO Xiuqin Sino-Dutch R&D Center for Future Wastewater Treatment Technologies, Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
Abstract:Aiming at the common problems of insufficient carbon source in rural domestic wastewater, the effects of different organic carbon sources in denitrification process were studied. SBR reactor was used to study its denitrification rate and variation of nitrogen element indices when sodium acetate, ethanol, glucose and sucrose were taken as carbon sources and COD/N value was controlled at 4.5, 5, 6.5 and 6.5, respectively. The results showed that when sodium acetate, ethanol, glucose or sucrose were added, the average denitrification rates were 0.050, 0.031, 0.034 and 0.026 g·(g·h)?1, respectively. The more complex the organic structure, the more complex the metabolic process and the longer the time required for denitrification. When sodium acetate, ethanol, glucose, or sucrose were added and the nitrate was completely consumed, the nitrite accumulation reached the maximum value at 50, 70, 70 and 70 min, respectively. When glucose was used as the carbon source, the maximum nitrite accumulation rate was 42.5%. When sodium acetate or ethanol were used as the carbon source, the maximum nitrite accumulation rate were 23.2% and 19.5%, respectively. When sucrose was used as the carbon source, the maximum nitrite accumulation rate was the smallest with a value of 7.0%. The results of this study can provide a reference for the selection of external carbon sources in the process of low-concentration rural sewage treatment. Key words:low-concentration wastewater/ nitrite/ denitrification/ carbon source/ SBR.
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Sino-Dutch R&D Center for Future Wastewater Treatment Technologies, Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China Received Date: 2020-01-15 Accepted Date: 2020-06-04 Available Online: 2020-09-05 Keywords:low-concentration wastewater/ nitrite/ denitrification/ carbon source/ SBR Abstract:Aiming at the common problems of insufficient carbon source in rural domestic wastewater, the effects of different organic carbon sources in denitrification process were studied. SBR reactor was used to study its denitrification rate and variation of nitrogen element indices when sodium acetate, ethanol, glucose and sucrose were taken as carbon sources and COD/N value was controlled at 4.5, 5, 6.5 and 6.5, respectively. The results showed that when sodium acetate, ethanol, glucose or sucrose were added, the average denitrification rates were 0.050, 0.031, 0.034 and 0.026 g·(g·h)?1, respectively. The more complex the organic structure, the more complex the metabolic process and the longer the time required for denitrification. When sodium acetate, ethanol, glucose, or sucrose were added and the nitrate was completely consumed, the nitrite accumulation reached the maximum value at 50, 70, 70 and 70 min, respectively. When glucose was used as the carbon source, the maximum nitrite accumulation rate was 42.5%. When sodium acetate or ethanol were used as the carbon source, the maximum nitrite accumulation rate were 23.2% and 19.5%, respectively. When sucrose was used as the carbon source, the maximum nitrite accumulation rate was the smallest with a value of 7.0%. The results of this study can provide a reference for the selection of external carbon sources in the process of low-concentration rural sewage treatment.
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