引用本文:李海云,邸琰茗,李东青,梁籍,郭逍宇,等.北京市潮白河再生水补水河段水质时空变异[J].环境科学研究,2017,30(10):1542-1552.
LI Haiyun,DI Yanming,LI Dongqing,LIANG Ji,GUO Xiaoyu,et al.Spatial and Temporal Variations of Water Quality in a Wetland-Reclaimed Water-Supplied Purification Urban River:Case Study in Chaobai River of Beijing[J].Reserrch of Environmental Science,2017,30(10):1542-1552.]
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北京市潮白河再生水补水河段水质时空变异
李海云1,2,3,4, 邸琰茗1,2,3,4, 李东青1,2,3,4, 梁 籍5, 郭逍宇1,2,3,4
1.首都师范大学资源环境与旅游学院, 北京 100048 ;2.三维信息获取与应用教育部重点实验室, 北京 100048 ;3.资源环境与地理信息系统北京市重点实验室, 北京 100048 ;4.北京市城市环境过程与数字模拟重点实验室, 北京 100048 ;5.华中科技大学水电与数字化工程学院, 湖北 武汉 430074
摘要:
城市河道是城市再生水利用的主要载体,而人工湿地是城市再生水河道补水前主要的水质净化方式.为了解再生水补水与人工湿地对再生水补水段水质的影响,选取北京市潮白河再生水补水河段作为研究对象,利用聚类分析、判别分析及因子分析等方法对不同季节水体的水质情况进行分析.结果表明:研究区内水体氮磷污染严重,其中TN污染表现为NO3--N、NO2--N和NH4+-N的混合型污染.聚类分析结果表明,水质在季节尺度上表现为丰水期(6-9月)和枯水期(2月、3月、5月和12月)两大类;在空间尺度上受再生水补水和湿地净化的影响表现为显著的空间差异性.判别分析结果表明,再生水补给对河道水质的影响无显著季节差异,湿地净化功能在丰水期和枯水期差异较大且丰水期湿地的净化效果最为明显.因子分析结果表明,再生水作为城市河道的补充水源,一方面对河道中的F-、Chl-a等起到稀释作用,另一方面使得水体中的N、P及离子含量增加;丰水期湿地的净化作用使水体中氮磷等有机营养物质含量及ρ(TDS)等显著降低.
关键词:  再生水补水  人工湿地  多元统计分析  时空变异
DOI:10.13198/j.issn.1001-6929.2017.02.93
分类号:
基金项目:国家自然科学基金项目(40901281);北京市教育委员会科技计划面上项目(KM20130028012)
Spatial and Temporal Variations of Water Quality in a Wetland-Reclaimed Water-Supplied Purification Urban River:Case Study in Chaobai River of Beijing
LI Haiyun1,2,3,4, DI Yanming1,2,3,4, LI Dongqing1,2,3,4, LIANG Ji5, GUO Xiaoyu1,2,3,4
1.College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China ;2.Laboratory of 3D Information Acquisition and Application, MOST, Beijing 100048, China ;3.Beijing Municipal Key Laboratory of Resources Environment and GIS, Beijing 100048, China ;4.Urban Environmental Processes and Digital Modeling Laboratory, Beijing 100048, China ;5.College of Hydroelectricity and Digitalization Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:
Urban riversare the main carriers of reclaimed water, while urban wetlands are widely applied to improve the quality of urban landscape water. In order to analyze the spatial and temporal variations in water quality and to identify pollution sources, we described the variations in the water quality of a typical urban river supplied with reclaimed water. Clustering analysis (CA), discriminant analysis (DA) and principal component analysis/factor analysis (PCA/FA) of multivariate statistics were used. Statistical analysis of water quality characteristics showed that the nitrogen and phosphorus pollution was serious in the study area, and the pollution of TN was mixed pollution of NO3--N, NO2--N and NH4+-N. The mean of TP (1.36 mg/L) was 6.8 times higher than the surface water Ⅲ class standard, and The mean of TN (39.75 mg/L) was 39.75 times higher than the surface water Ⅲ class standard. The results of cluster analysis showed that the water quality was divided into two categories at the season scale:flood period (from June to September) and non-flood period (February, March, May and December). Affected by the variation of temperature and runoff of different seasons, fluorine and aluminum were significantly selected to indicate seasonal variation. The results of discriminant analysis showed that there was no significant seasonal difference in the effect of reclaimed water supply on the river channel; the purification function of wetland was different in the wet and dry seasons; and the purification effect of wetland in the wet season was the most obvious. Compared with the water quality upstream, reclaimed water distinctly increased the contents of Fe3+, Na+, TN and volatiles. Attributing to the active wetland purification during the flood period, there was no significant difference in nitrogen and phosphorus contents between upstream and downstream samples. Owing to the poor wetland purification and litter nutrient returning, the contents of NH4+-N, TN and BOD5 were significantly higher in the downstream sample than in the upstream sample. The results of source and components of pollutants based on factor analysis showed that the reclaimed water played a role in diluting the river pollution, such as F- and Chl-a. On the other hand, the reclaimed water increased the content of N, P and ions. Wetlands have a significant purification function on reclaimed water. The purification effect of wetlands in FL made the organic nutrients such as nitrogen and phosphorus and the content of TDS decrease obviously. The results can provide scientific basis for the ecological restoration of urban river supplied with reclaimed water. To sum up, the reclaimed water supply, the acid and alkali pollution and the redox effect of wetland were the main sources of water pollution. The water pollution in the study area was mainly organic matter, nitrogen and phosphorus and ion pollution. It is necessary to strengthen the supervision over the discharge of reclaimed water, and strictly enforce the discharge standard of wastewater for the regeneration of water.
Key words:  reclaimed water  constructed wetlands  multivariate statistical analysis  spatial and temporal variations