Flocculation process of fine-grained sediments by the combining effect of salinity and humus in the Changjiang Estuary in China

LIU Qi-zhen; LI Jiu-fa; XU Can-hua; DAI Zhi-jun; LI Dao-ji

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Article Navigation > Haiyang Xuebao > 2008 > 30(3): 140-147

LIU Qi-zhen, LI Jiu-fa, XU Can-hua, DAI Zhi-jun, LI Dao-ji. Flocculation process of fine-grained sediments by the combining effect of salinity and humus in the Changjiang Estuary in China[J]. Haiyang Xuebao, 2008, 30(3): 140-147.

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Flocculation process of fine-grained sediments by the combining effect of salinity and humus in the Changjiang Estuary in China

1.
Shanghai Environment Monitoring Center, Shanghai 200030, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
3.
Shanghai Municipal Sewerage CoLtd, Shanghai 200070, China

Received Date: 2007-05-20
Rev Recd Date: 2007-10-16

Abstract

Abstract

For the great amount of organic compounds and the variation of salinity in the Changjiang Estuary,the study on the flocculation process of fine-grained sediments by the combining effect of salinity and humus on the high-turbid system is of critical significance in the underst anding of the mechanism of the formation of maximum turbidity zone.The effects of salinity and humus on the fine-grained sediments are analyzed through the synthetic study of the aspects of flocculation/coagulation power,diameter and electric pot ential.And the microco smic configuration of the flocs is analyzed by using the scan electron microsco peand Fourier transform infrared spectrometry.The results show that:(1) with the increase of salinity,floculation/coagulation power and diameter become greater and the electric potential becomes smaller,and with increase of the concent ration of humus,flocculation becomes smaller,but the diamerer and the electric potential become greater;(2) the micro cosmic config uration of the flocculation shows that humus packs on the fine sediments in the form of salt,and the flocculation model of clay-positiveion-orgamic compound can successfully demonst rate the mechanism of the for mation of the fine-grained sediments in the high-turbid area of Changjiang Estuary.
- Chang jiang Estuary,
- org anic compounds,
- fine-grained sediment,
- salinity,
- flocculation

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References(33)

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