The Effects of Different External Carbon Sources on Nitrous Oxide Emissions during Denitrification in Biological Nutrient Removal Processes

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Hu, Xiang^1 ; Zhang, Jing^1 ; Hou, Hongxun^1

Anhui Guozhen Environmental Protection Sci. AndTech. Co. Ltd., Anhui Province Hefei

230088, China^1

关键词: Biological nutrient removal;    Carbon source;    Denitrification process;    External carbon addition;    Nitrous oxide;    Nitrous oxide emissions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012111/pdf
DOI  :  10.1088/1757-899X/301/1/012111

来源: IOP

【 摘 要 】

The aim of this study was to investigate the effects of two different external carbon sources (acetate and ethanol) on the nitrous oxide (N2O) emissions during denitrification in biological nutrient removal processes. Results showed that external carbon source significantly influenced N2O emissions during the denitrification process. When acetate served as the external carbon source, 0.49 mg N/L and 0.85 mg N/L of N2O was produced during the denitrificaiton processes in anoxic and anaerobic/anoxic experiments, giving a ratio of N2O-N production to TN removal of 2.37% and 4.96%, respectively. Compared with acetate, the amount of N2O production is negligible when ethanol used as external carbon addition. This suggested that ethanol is a potential alternative external carbon source for acetate from the point of view of N2O emissions.