| 污水生物处理过程中溶解性有机氮分布和转化特征 |
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| 引用本文： | 王小东,陈明飞,王子文,王燕,王硕,李激.污水生物处理过程中溶解性有机氮分布和转化特征[J].哈尔滨工业大学学报,2020,52(2):161-168. |
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| 作者姓名： | 王小东 陈明飞 王子文 王燕 王硕 李激 |
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| 作者单位： | 江南大学 环境与土木工程学院,江苏 无锡214122,江南大学 环境与土木工程学院,江苏 无锡214122,江南大学 环境与土木工程学院,江苏 无锡214122,江南大学 环境与土木工程学院,江苏 无锡214122,江南大学 环境与土木工程学院,江苏 无锡214122;江苏省厌氧生物技术重点实验室(江南大学),江苏 无锡214122;江苏省高校水处理技术与材料协同创新中心,江苏 苏州215009,江南大学 环境与土木工程学院,江苏 无锡214122;江苏省厌氧生物技术重点实验室(江南大学),江苏 无锡214122;江苏省高校水处理技术与材料协同创新中心,江苏 苏州215009 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项(2017ZX07202-001)； 江苏省重点研发计划(社会发展)科技示范工程(BE2015622) |
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| 摘 要： | 为研究太湖流域城镇污水处理厂溶解性有机氮（dissolved organic nitrogen,DON）的污染现状及迁移转化规律,选取数座典型污水处理厂（wastewater treatment plants,WWTPs）,通过长期水质监测研究出水DON污染水平及其季节变化,并运用多种方法阐明WX-A工艺沿程中DON的分子质量（molecular weight,MW）、亲疏水及荧光光谱变化等特性.结果表明:出水中97.66%～99.22%的含氮化合物为溶解态,DON/溶解性总氮（soluble total nitrogen,STN）为21.88%～26.15%,DON平均质量浓度范围为2.7～3.4 mg/L.厌氧段DON质量浓度出现明显降低趋势,生物膜法（moving bed biofilm reactor,MBBR）工艺段中,分子质量高于30 ku的DON被降解为低于3 ku的DON.出水中低于1 ku的DON比例约为42%,79%的出水DON为亲水性化合物.荧光谱图显示进水DON以酪氨酸类蛋白质和溶解性微生物代谢产物为主要组分,总荧光响应百分比（Pi,n,%）达76.5%,但是进出水中区域Ⅱ（酪氨酸类蛋白质）和区域Ⅳ（溶解性微生物代谢产物）的荧光区域标准体积去除率分别为77.0%和23.7%,进一步表明活性污泥工艺无法实现低分子有机氮的高效去除.
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| 关 键 词： | 污水处理厂 溶解性有机氮 分子质量 三维荧光光谱 荧光响应百分比 |
| 收稿时间： | 2018/12/18 0:00:00 |
Distribution and transformation characteristics of dissolved organic nitrogen in wastewater biological treatment process |
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| WANG Xiaodong,CHEN Mingfei,WANG Ziwen,WANG Yan,WANG Shuo and LI Ji.Distribution and transformation characteristics of dissolved organic nitrogen in wastewater biological treatment process[J].Journal of Harbin Institute of Technology,2020,52(2):161-168. |
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| Authors: | WANG Xiaodong CHEN Mingfei WANG Ziwen WANG Yan WANG Shuo and LI Ji |
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| Affiliation: | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China,School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China,School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China,School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China,School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China ;Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan University, Wuxi 214122, Jiangsu, China ;Collaborative Innovation Center of Water Treatment Technology and Material of Jiangsu Colleges, Suzhou 215009, Jiangsu, China and School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China ;Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan University, Wuxi 214122, Jiangsu, China ;Collaborative Innovation Center of Water Treatment Technology and Material of Jiangsu Colleges, Suzhou 215009, Jiangsu, China |
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| Abstract: | To investigate the pollution status and migration and transformation rules of dissolved organic nitrogen (DON) in urban wastewater treatment plants (WWTPs) of Taihu Basin, several typical WWTPs were selected. Through long-term wastewater quality monitoring of the DON pollution level and seasonal variation, DON molecular weight, hydrophobicity, and fluorescence spectrum characteristics were studied by multiple methods. Experimental results showed that 97.66%-99.22% of effluent nitrogen were dissolved nitrogen compound, and the proportion of DON to soluble total nitrogen (STN) was 21.88%-26.15%, and the average DON concentration ranged from 2.7 to 3.4 mg/L. A significant decrease of DON was observed in anaerobic tank, and the DON with molecular weight higher than 30 ku was degraded to lower than 3 ku after moving bed biofilm reactor (MBBR) process. In the study, 42% of the DON with molecular weight lower than 1 ku was measured within effluent, and 79% of the effluent DON were hydrophilic compounds. Fluorescence spectrum showed that tyrosine-like proteins and soluble microbial metabolites were the main influent DON components, and the total fluorescence response percentage (Pi,n, %) reached 76.5%. However, the removal rates of tyrosine protein and soluble microbial metabolite were 77.0% and 23.7% respectively, which further indicated that the activated sludge process was not suitable to the effective removal of low molecular weight organic nitrogen. |
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| Keywords: | wastewater treatment plants dissolved organic nitrogen molecular weight three dimensional fluorescence spectrum fluorescence response percentage |
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