REMOVAL OF METALS DURING ESTUARINE MIXING

摘要

Behavior of metals during estuarine mixing can significantly influence the chemical mass balance between rivers and seas or lakes. In the present study, the removal of dissolved metals Cu, Ni, Zn, Pb and Mn in Zarinehrud River water during estuarine mixing with Uremia Lake is investigated. In flocculation vessels, filtered river water and lake water were mixed together at room temperature in various proportions yielding 6 different salinities (2 to 2%o). The results show that pH is the most important governing factor in the flocculation of the studied metals, and Eh, SO_4~(2-), Cl~-, EC and salinity have a reverse effect on flocculation process in Zarinehrud River estuary. Rapid flocculation in the lower salinity regimes was observed (2 to 6‰). The final flocculation rate of the studied metals was in the following order: Mn (75%) > Ni (74%) > Zn (67%) >Pb (63%)> Cu (48%).