The role of reversibility in flocculation of heavy metals in the estuarine zone

Document Type : Original Article

Authors

1 Graduate Faculty of Environmental Engineering, University of Tehran, Tehran, Iran.

2 Associate Professor, Graduate Faculty of Environmental Engineering, University of Tehran, Tehran. Iran.

3 - M.Sc. Graduate of Coastal Engineering, Department of Environmental Engineering, college of Environmental, University of Tehran, Tehran, Iran.

Abstract

After discover of flocculation process in estuaries, there was a significant change in calculation of dissolved metals load entering sea and other saline water environments through rivers. In other words, due to mixing of fresh and saline water in an estuarine zone, a significant amount of heavy metals flocculate and settle in the estuarine zone. In the present research, the flocculation process of heavy metals in Shfarud River is investigated during estuarine mixing with Caspian Sea water. Results indicated that that Cd, Cr, Co and Ni lose their initial load by 86, 74, 62 and 52 percent, respectively. Furthermore, an updated method, which is considered as one achievement, was used to simulate the estuary in this research. Actually, it is showed that flocculation process could be a reversible process. In other words, due to continuous chemical and physical change of estuary environment, flocs of metals might return to dissolve phase.

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Main Subjects

References

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Iran-Water Resources Research
Volume 15, Issue 1
February 2019
Pages 154-162

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History

  • Receive Date: 06 April 2018
  • Revise Date: 16 October 2018
  • Accept Date: 19 October 2018

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