Quality characterization and impact assessment of highway runoff in urban and rural area of Guangzhou, China
Quality characterization and impact assessment of highway runoff in urban and rural area of Guangzhou, China
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DOI：
10.1007/s10661-007-9856-2
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发表时间：
2008-05-01
影响因子：
3
通讯作者：
Zhou, Yongzhang
中科院分区：
文献类型：
--
作者：
Gan, Huayang;Zhuo, Muning;Zhou, Yongzhang
准确了解华南珠三角地区公路径流的质量和环境影响是评估这一重要面源污染源的必要条件。本文介绍了珠江三角洲第一大城市广州市城乡公路降雨径流历时一年调查的水质特征及环境影响评价。采用多元回归和Pearson相关分析确定降雨特征对水质的影响以及公路径流各成分之间的相关性。结果分析表明，径流水接近中性，可生物降解性较低。与径流中的营养成分含量较低相比，石油和油脂 (O&G)、悬浮固体 (SS) 和重金属是主要污染物。对于大多数选民来说，农村地区的公路径流质量优于城市地区。深度和前期枯水期是影响公路径流质量的主要降雨因素。城市公路径流成分之间的相关模式与其在水中的主导相一致。化学需氧量 (COD)、总磷、铜和锌以及电导率、硝态氮和总氮之间存在很强的相关性 (r >= 0.80)。城市公路径流中O&G、COD、SS、Pb的浓度大大超过珠江受纳水体的浓度。目前农村公路径流直接排放的土壤，表层重金属污染严重，pH值由原来的酸性转为碱性。
Accurate knowledge of the quality and environmental impact of the highway runoff in Pear River Delta, South China is required to assess this important non-point pollution source. This paper presents the quality characterization and environmental impact assessment of rainfall runoff from highways in urban and rural area of Guangzhou, the largest city of Pear River Delta over 1 year's investigation. Multiple regression and Pearson correlation analysis were used to determine influence of the rainfall characteristics on water quality and correlations among the constituents in highway runoff. The results and analysis indicates that the runoff water is nearly neutral with low biodegradability. Oil and grease (O&G), suspended solids (SS) and heavy metals are the dominant pollutants in contrast to the low level of nutrient constituents in runoff. Quality of highway runoff at rural site is better than that of at urban site for most constituents. Depth and antecedent dry period are the main rainfall factors influencing quality of highway runoff. The correlation patterns among constituents in highway runoff at urban site are consistent with their dominant phases in water. Strong correlations (r >= 0.80) are found among chemical oxygen demand (COD), total phosphorus, Cu and Zn as well as conductivity, nitrate nitrogen and total nitrogen. O&G, COD, SS and Pb in highway runoff at urban site substantially exceed their concentrations in receiving water of Pear River. The soil directly discharged by highway runoff at rural site has contaminated seriously by heavy metals in surface layer accompanying with pH conversion from original acidic to alkaline at present.