| 城镇与城郊污染河道中DOM成分分布与影响因素 |
| 摘要点击 2077 全文点击 589 投稿时间：2021-04-05 修订日期：2021-04-24 |
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| 中文关键词 溶解性有机物(DOM) 三维荧光耦合平行因子分析(EEM-PARAFAC) 城镇河道 城郊河道 生活污水污染 农业废水污染 |
| 英文关键词 dissolved organic matter(DOM) excitation-emission matrix-parallel factor analysis(EEM-PARAFAC) urban rivers suburban rivers sewage pollution agricultural wastewater pollution |
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| 中文摘要 |
| 河道水环境的溶解性有机物（dissolved organic matter，DOM）是全球碳循环的重要环节.在国内当前城镇河道污染治理攻坚的紧迫形势下，探究河道DOM受不同类型的外源污染、内源次生污染及天气模式等因素的影响，是明晰关键污染成因的前提.为了解析受生活污水污染的城镇河道与受水产养殖业、种植业及畜禽养殖业污染的城郊河道中DOM成分与当量的差异，以某大型城市作为研究区域，以城镇河道、城郊河道与水源地共21个点位的表层水与沉积物为研究对象，应用了三维荧光光谱-平行因子分析（excitation-emission matrix-parallel factor analysis，EEM-PARAFAC）.结果表明：①城镇与城郊河道水体DOM成分都以蛋白质类成分为主（酪氨酸类与色氨酸类成分），含有少量腐殖酸类成分，但城镇河道水体存在人为腐殖酸类成分；②城镇河道与市郊河道DOM成分的形成原因截然不同，城镇河道主要受生活污水污染与内源次生污染，导致人为腐殖酸类成分增多.城郊河道主要受富含N、P的农业废水污染，促进自养细菌的内源代谢使蛋白质类成分增多，这可能是形成其现有DOM特征的关键原因；③降雨产生的雨水径流与城市溢流将外源污染物输送到河道中，同时水力搅动等水动力学因素通过稀释等物理作用影响了表层水与沉积物中的DOM成分分布. |
| 英文摘要 |
| Dissolved organic matter(DOM) in water environments is an important component of the global carbon cycle. Under the current urgency to control the pollution of urban rivers in China, exploring the influence of different exogenous and endogenous secondary pollution and weather patterns on river DOM is the premise to better understand the causes of the pollution. In this study, a large city in China was established as the research area, and the underlying water and sediments from 21 sites along urban and suburban rivers, and other water sources were evaluated. The excitation-emission matrix-parallel factor analysis(EEM-PARAFAC) was used to analyze the difference in DOM composition and equivalent in urban rivers polluted by domestic sewage and suburban rivers polluted by aquaculture, agriculture, and livestock breeding. The results showed that:① DOM components in urban and suburban river waters were mainly protein compounds(tyrosine-and tryptophan-like), containing a small amount of humic acid. Humic acid components of anthropogenic origin were found in urban river water; ② The reasons for the formation of DOM components in urban and suburban rivers were completely different. Urban rivers are mainly polluted by domestic sewage and endogenous secondary pollution, resulting in an increase in anthropogenic humic acid components. Suburban rivers are mainly polluted by agricultural wastewater rich in N and P, which promotes endogenous metabolism of autotrophic bacteria and increases protein components, which may be related to the formation of existing DOM characteristics. ③ Rainfall runoff and urban overflow transported exogenous pollutants into rivers, while hydrodynamic factors such as hydraulic agitation affect the distribution of DOM components in underlying water and sediments through physical effects such as dilution. |
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