RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (11): 1913-1919.doi: 10.11870/cjlyzyyhj201511015

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POLLUTION CHARACTERISTICS AND ECOLOGICAL RISK ASSESSMENT OF SEDIMENT FROM MALODOROUS RIVERS IN NANJING CITY

LI Ji-zhou1,2, WU Hai-xu1, JIANG Wan1, YUAN Xu-yin1,2, LIU Bin-wu1   

  1. 1. College of Environmental, Hohai University, Nanjing 210098, China;2.
    Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Nanjing 210098, China
  • Received:2015-01-14 Revised:2015-05-07 Online:2015-11-20

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Abstract: Malodorous status of urban rivers is an environmental problem that occurs in many cities of our country. Study on the pollution characteristics of pollutants in sediment, such as organic matter, nitrogen, phosphorus and heavy metals, together with the ecological risk assessment, is of great significance to the pollution control and ecological restoration of malodorous rivers. Eight typical malodorous rivers were chosen in Nanjing City. Their surface sediment samples were collected and analyzed. The result showed that the contents of organic matter, total nitrogen and total phosphorus ranged from 0.75% to 10.86%, 0.05% to 0.68% and 0.04% to 0.23%, respectively. Significant positive correlations were found among these three pollutants, indicating that they were from the same pollution source. Assessed by the sediment quality standard, it can be known that the contents of these three pollutants were all between the severe level and the lowest level in general. While the pollution of nitrogen and phosphorus was more serious than that of organic matter. The mean contents of the six heavy metals in sediment were all higher than their background value. Extremely significant positive correlations were shown between Cu, Cr, Ni and Zn, while no good correlations were found among different heavy metals and nutrients. The result of potential ecological risk assessment indicates that the pollution of heavy metals in the sediment of malodorous rivers was serious and the potential ecological risk of 84.2% of the samples was high. The potential ecological risk of these elements was Cd>Cu>Pb>Cr>Ni>Zn in sequence. Cadmium was the key pollutant and had very strong ecological risk. Compared with other typical polluted water bodies in our country, the pollution of total nitrogen, total phosphorus and cadmium in the sediment of malodorous rivers in Nanjing City was more serious.

Key words: malodorous rivers, sediment, pollution characteristics, ecological risk, assessment

CLC Number: 

  • X524
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