LIHui-ping,PANGWei-hai,XIELi,et al.Characteristics and Conversion of Organic Carbon Sources during Treatment of Municipal Wastewater with Low Carbon to Nitrogen Ratio[J].China Water & Wastewater,2022,38(7):69-74.
低C/N污水处理过程中有机碳源的特性及转化分析
- Title:
- Characteristics and Conversion of Organic Carbon Sources during Treatment of Municipal Wastewater with Low Carbon to Nitrogen Ratio
- Keywords:
- municipal wastewater; low C/N; organic carbon source; parallel factor; advanced denitrification
- 摘要:
- C/N值是影响污水脱氮效果的主要因素之一，为探究低C/N值城镇污水处理过程中不同特性有机碳源的利用水平，采用三维荧光光谱-平行因子分析技术（3DEEM-PARAFAC），对广东省某污水厂SBR工艺不同处理阶段的水质进行分析。结果表明，3DEEM-PARAFAC技术可有效表征低C/N污水处理过程中有机碳源的特征变化，并解析出4种荧光组分：类色氨酸、氨基酸、腐殖酸类和富里酸类。其中，类色氨酸和氨基酸占比较高，属于易生物降解碳源；腐殖酸类和富里酸类占比较低，属于难生物降解碳源。相关性分析表明，4种荧光组分与COD、TP、NH4+-N和TN指标之间存在显著相关性（p<0.05），其中氨基酸呈现出最显著相关性，是影响脱氮效果的关键物质。
- Abstract:
- The carbon to nitrogen ratio (C/N) is one of the main factors affecting the nitrogen removal efficiency of wastewater. To investigate the utilization rate of organic carbon sources with different characteristics in low C/N municipal wastewater treatment, the effluent quality in different treatment stages of a SBR process in a wastewater treatment plant in Guangdong Province was analyzed by using three-dimensional excitation emission matrix and parallel factor analysis (3DEEM-PARAFAC). The 3DEEM-PARAFAC technology could effectively characterize the characteristics change of organic carbon sources in the treatment process of low C/N wastewater, and four fluorescent components were identified, namely tryptophan-like, amino acids, humic acids and fulvic acids. Among them, tryptophan-like and amino acids were biodegradable organic carbon sources with high proportion, while humic acids and fulvic acids belonged to recalcitrant organic carbon sources with low proportion. Correlation analysis showed that there were significant correlations between the four fluorescence components and COD, TP, NH4+-N and TN (p<0.05). Among them, amino acids showed the most significant correlation and was the key substance affecting the denitrification efficiency.
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