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paper20133

Removing Cd2+ from water and wastewater by blowy sand; the effects of total hardness and pH

 
 
Shayan Shamohamadi a , Mohammad Bustanian a & Hossein Tavakol
 
Desalination and Water Treatment
doi: 10.1080/19443994.2012.749365
51 (2013) 3463–3471
 
ABSTRACT
In the present work, blowy sand, as a cheap and available adsorbent, was employed to
remove the Cd2+ from water and obtain the best kinetic and isotherm models for this elimination
process. In addition, the effects of total hardness and pH on this process were examined
to obtain the best conditions for elimination of Cd2+. The calibration of kinetic and
isotherm models shows that the model presented by Ho and co-workers is the best kinetic
model and Redlich–Peterson model is the best isotherm model for presentation of our
results. The pH equal to 5 is the best acidic condition to remove Cd2+ in all conditions. Moreover,
by the increase of total hardness from 0 to 320 (in milligrams of calcium carbonate), the
efficiency and capacity of adsorption will decrease, respectively, from 80.4% to 18.7% and
from 0.331 to 0.067 mg/g. The reusability of adsorbent without decreasing its efficiency is
three times.

 

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