EXPERIMENTAL STUDY OF SORPTION AND TRANSPORT OF CADMIUM IN THE PRESENCE OF BED LOAD

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MAHDAVI ALI; OMID M.H.; GANJALI M.R.

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Journal: Journal of Environmental Studies Year:2009 | Volume:34 | Issue:48 Page(s): 1-12

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Title

EXPERIMENTAL STUDY OF SORPTION AND TRANSPORT OF CADMIUM IN THE PRESENCE OF BED LOAD

Author(s)

MAHDAVI ALI | OMID M.H. | GANJALI M.R. | Issue Writer Certificate

Keywords

BED LOADQ3

SORPTIONQ2

CIRCULAR FLUMEQ3

POLLUTANT TRANSPORTQ2

HEAVY METALSQ2

Abstract

The influence of environmental variables on trace heavy metal partitioning has been widely investigated by means of batch reactor experiments, where the interactions between water, sediments and heavy-metal ions differ from those in natural conditions. Since advection, which is an important factor in sediment and POLLUTANT TRANSPORT, is ignored in TST (Turbulence Simulation Tank) experiments, this technique does not exhibit good simulations of the natural conditions. To get enhanced simulations for this condition, a CIRCULAR FLUME, which is well known device in cohesive sediment transport investigations, was used in this study. The kinetic SORPTION of cadmium (Cd) was investigated in a CIRCULAR FLUME and by batch reactor experiments, and variations of cadmium concentration with time in a water column and a sediment layer were measured. It was found that sediment motion can affect the adsorption kinetics. The results show that the equilibrium SORPTION and SORPTION rate will be over estimated by batch reactor experiments. Therefore, considering natural condition of sediment movement in studying transport transformation modeling of heavy metal pollutant is necessary. The effects of EC, pH, temperature, sediment concentration and cadmium concentration were also investigated through the experiments. Results show that the amount of adsorbed Cd in unit weight of the sediment increases by increasing Cadmium concentration, but the removal percent of Cadmium will be decreased. The results also indicate that the amount of adsorbed Cd in unit weight of sediment will be decreased by increasing sediment concentration; however the total removed Cadmium is increased. Increasing temperature will increase the amount of adsorbed Cadmium by unit weight of sediment. Even though previous investigations, used deionized water, show that pH over 6 has no significant effect on SORPTION, but as we know in natural condition increasing pH may result in CaCo3 precipitation. The results indicate that precipitated CaCO3 increases the amount of removed Cadmium and decreases the equilibrium time. In fact, precipitation of CaCo3 seriously increases the amount of the removed Cadmium and the equilibrium time. Therefore SORPTION by CaCo3 must also be taken into account in the heavy metal transport transformation modeling.

Cites

EXPERIMENTAL STUDY OF CALCIUM CARBONATE ROLE IN REMOVAL, ADVECTION AND DISPERSION OF CADMIUM

References

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APA: Copy

MAHDAVI, ALI, OMID, M.H., & GANJALI, M.R.. (2009). EXPERIMENTAL STUDY OF SORPTION AND TRANSPORT OF CADMIUM IN THE PRESENCE OF BED LOAD. JOURNAL OF ENVIRONMENTAL STUDIES, 34(48), 1-12. SID. https://sid.ir/paper/2846/en

Vancouver: Copy

MAHDAVI ALI, OMID M.H., GANJALI M.R.. EXPERIMENTAL STUDY OF SORPTION AND TRANSPORT OF CADMIUM IN THE PRESENCE OF BED LOAD. JOURNAL OF ENVIRONMENTAL STUDIES[Internet]. 2009;34(48):1-12. Available from: https://sid.ir/paper/2846/en

IEEE: Copy

ALI MAHDAVI, M.H. OMID, and M.R. GANJALI, “EXPERIMENTAL STUDY OF SORPTION AND TRANSPORT OF CADMIUM IN THE PRESENCE OF BED LOAD,” JOURNAL OF ENVIRONMENTAL STUDIES, vol. 34, no. 48, pp. 1–12, 2009, [Online]. Available: https://sid.ir/paper/2846/en

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