Chinese Science Bulletin

, Volume 49, Issue 17, pp 1853–1859 | Cite as

Processes and mechanism of effects of sludge dredging on internal source release in lakes

  • Chengxin Fan
  • Lu Zhang
  • Jianjun Wang
  • Chaohai Zheng
  • Guang Gao
  • Sumin Wang
Articles

Abstract

Simulated research of internal loading and collecting and analyzing the samples from the lakes were carried out before and after dredging in polluted suburb lakes, Wuli Lake (Wuxi City) and Xuanwu Lake (Nanjing City). The research results showed that dredging can inhibit internal loadings in a certain degree in a short term. The discrepancy of dredging effect and technical level, namely dredging quality, by different dredging methods will result in a difference of control of lake internal loadings. The internal loadings’ reversion will gradually appear along with the biogeochemical processes, including suspended particle precipitation, hydrodynamic disturbance and microbio-transformation. The reversion rate mainly depends on the dredging method and the change of interfacial processes on the newborn surface layer. The higher nutrient contents and organic matter in the sediment will enhance water-sediment interfacial processes and nutrients regeneration. It is very important to study the physicochemical and biological character of lacustrine sediments before dredging for determining the dredging methods and predicting their environmental effect.

Keywords

lake sediment dredging internal source release pollution reversion interface process 

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Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Chengxin Fan
    • 1
  • Lu Zhang
    • 1
    • 2
  • Jianjun Wang
    • 1
    • 2
  • Chaohai Zheng
    • 3
  • Guang Gao
    • 1
  • Sumin Wang
    • 1
  1. 1.Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjingChina
  2. 2.Graduate School of Chinese Academy of SciencesBeijingChina
  3. 3.Hohai UniversityNanjingChina

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