Metals removal during estuarine mixing of Arvand River water with the Persian Gulf water
2010
Karbassi, Abdolreza (Graduate Faculty of Environment, University of Tehran, P.O.Box 14155-6135, Tehran, Iran) | Bidhendi, Gholam (Graduate Faculty of Environment, University of Tehran, P.O.Box 14155-6135, Tehran, Iran) | Saeedi, Mohsen (Environmental Research Laboratory, Department of Hydraulics and Environmental Engineering, School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, 16846, Iran) | Rastegari, Azadeh (Graduate Faculty of Environment, University of Tehran, P.O.Box 14155-6135, Tehran, Iran)
In the present study, the removal of dissolved and colloidal Cd, Co, Cu, Ni and Zn in Arvand River water during estuarine mixing with the Persian Gulf water is investigated. The flocculation process was investigated for a series of mixtures with salinities ranging from 0.48 to 30.3‰. The flocculation rates were indicative of the non-conservative behavior of studied metals during estuarine mixing. Rapid flocculation in the low salinity regimes was observed. The order of the final flocculation rate of metals in the river water was as follows: Co (91.2%)> Cd (86.9%)> Zn (83%)> Cu (75.2%)> Ni (74.3%). Salinity, pH, EC and dissolved oxygen do not govern the flocculation of metals during estuarine mixing. The results of the present investigation show that estuarine processes can be considered as an effective mechanism in self purification of colloidal metals that are anthropogenically introduced into the fresh water ecosystem.
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