Journal of East China Normal University(Natural Sc ›› 2015, Vol. 2015 ›› Issue (2): 58-66.doi: 10.3969/j.issn.1000-5641.2015.02.007

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Impact of dredging on water quality of Niuqiaodi River in Wenzhou

TONG Min1,2,YANG Le1,HUANG Min-sheng1,HE Yan1,CAO Chen-jing1   

  1. 1. School of Ecologial and Environmental Sciences, East China Normal University, Shanghai200062, China;
    2. Shanghai Baosteel New Building Materials Technology Co.Ltd, Shanghai201900, China
  • Received:2014-07-29 Online:2015-03-25 Published:2015-05-28

Abstract: The physicochemical factors, heavy metals and biological toxicity in water sample before, during and after dredging of Niuqiaodi River in Wenzhou were investigated. The result showed that after the sediment dredging of Niuqiaodi River, the CODCr concentration in water sample was significantly reduced,
while the DO content and transparency were enhanced. The contents of NH+4-N, TN, TP and heavy metals in water sample were firstly increased and then decreased. Both the Luminescent bacteria and Xenopus tropicalis embryos tests indicated the toxicity of water sample firstly weakened, then enhanced in different stages of dredging. Generally speaking, sediment dredging was helpful to alleviate the toxicity of water sample. The correlation analysis showed the toxicity of water sample was significantly related to TN content and had little relationship with heavy metals.

Key words: dredging, Niuqiaodi River, water quality, heavy metals, toxicity

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