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《Environmental Science》 2013-07
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Influence of Vallisneria spiralis on the Physicochemical Properties of Black-odor Sediment in Urban Sluggish River

XU Kuan1,LIU Bo1,2,WANG Guo-xiang1,MA Jiu-yuan1,CAO Xun1,ZHOU Feng1(1.School of Geographical Science,Nanjing Normal University,Nanjing 210046,China;2.School of Geographical Science,Nantong University,Nantong 226000,China)  
Using Indoor simulation method,the effect of Vallisneria spiralis on the physicochemical propertise of black and stink sediment was investigated.The surface sediment of urban sluggish river which had been heavily polluted was used as material in the study.The results showed that the redox environment of the sediment was significantly improved by Vallisneria spiralis.During the experiment,the Eh of surface sediment rose from-70 mV to 90 mV.The ferrous content was reduced by 25% in the experiment group while increased by 38% in the control group;the organic matter was decomposed effectively,prevented from natural decomposition to the smelly substances.There was a 3 mm thick greyish yellow oxide layer after 7 days in the experimental group,and the oxide layer gradually thickened over time.The thickness of the oxide layer reached 11mm at the end of the experiment,and no significant odor was detected.On the contrary,the oxide layer in the control group was only 1mm thick and the thickness remained unchanged.Meanwhile,an obnoxious odor existed during the whole experiment.The roots of Vallisneria spiralis had significant influence on the porosity of sediment.On one hand,the densification of sediment could be improved by Vallisneria spiralis.On the other hand,Vallisneria spiralis was able to change the state of the surface sediment flows,reduce the erosion of river sediment and inhibit the transfer of black-odor substances,which has a positive ecological meaning.
【Fund】: 江苏省太湖水环境治理专项基金项目(TH2011207);; 江苏省科技厅科技支撑计划项目(BE2011690);; 江苏省建设系统科技项目(JS2011JH25);; 科技部国际合作专项(2010DFB33960)
【CateGory Index】: X524
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