| 苏州城区雨水管道沉积物典型污染物分布特征 |
| 摘要点击 1775 全文点击 607 投稿时间：2021-04-16 修订日期：2021-06-09 |
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| 中文关键词 雨水管道 沉积物 粒径分布 总氮(TN) 总有机碳(TOC) 氨氮(NH4+-N) |
| 英文关键词 rainwater sewer sediments particle size distribution total nitrogen(TN) total organic carbon(TOC) ammonia nitrogen(NH4+-N) |
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| 中文摘要 |
| 分别采集了苏州城区商业区、历史文化保护区、文教区和生活区等典型样点的雨水管道沉积物，分析沉积物粒径分布和各分级粒度下碳、氮和磷含量及污染负荷的分布特征.结果表明，各样点沉积物颗粒的中值粒径（D50）为16.55~327.50 μm，从大到小为：商业区 > 生活区 > 历史文化保护区 > 文教区，D50与沉积物中总有机碳（TOC）、总氮（TN）、总磷（TP）和氨氮（NH4+-N）呈显著正相关.各样点雨水管道沉积物中ω（TOC）、ω（TN）、ω（TP）和ω（NH4+-N）空间差异性为：商业区 > 历史文化保护区 > 生活区 > 文教区，其中ω（TOC）为0.84%~6.76%，ω（TN）、ω（TP）和ω（NH4+-N）分别为：917.5~12707.1、196.1~2524.8和9.3~156.8 mg·kg-1，TOC、TP和NH4+-N污染负荷主要来源为≤ 75 μm和250~1000 μm颗粒物.TP和TN在管道内呈现一定的富集特性. |
| 英文摘要 |
| In this study, we separately collected rainwater sewer sediments from typical samples in Suzhou city, such as the urban commercial district, historical and cultural protection area, cultural and educational area, and living area, and analyzed the particle size distribution of the sediments and the characteristics of carbon, nitrogen, phosphorus content, and pollution load distribution under each graded particle size. The median particle size D50 of each sample point was 16.55-327.50 μm, and the particle size trend was as follows:commercial area > living area > historical and cultural protection area > cultural and educational area. D50 was related to the total organic carbon (TOC). The total nitrogen (TN), total phosphorus (TP), and ammonia nitrogen (NH4+-N) were significantly positively correlated, as were the pollutants. The spatial difference of ω(TOC), ω(TN), ω(TP), and ω(NH4+-N) in rainwater sewer sediments from different regions was as follows:commercial area > historical and cultural protection area > living area > cultural and educational area, in which ω(TOC) was 0.84%-6.76%, and ω(TN), ω(TP), and ω(NH4+-N) were 917.5-12707.1, 196.1-2524.8, and 9.3-156.8 mg·kg-1, respectively. TOC, TP, and NH4+-N pollution loads were mainly concentrated on particles ≤ 75 μm and 250-1000 μm. Street dust pollutants highly differed spatially, with a high content of attached pollutants on street dust particles with a particle size of ≤ 75 μm. Various pollutants migrated into the street dust-pipes, and TP and TN showed certain enrichment characteristics in the sewer. Controlling the transportation of street dust and the accumulation of sediments in the sewer can reduce the pollution of sediment into the rivers during the rainy season. |
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