Authors: Mohsen Nasrabadi; Mohammad H. Omid; Ali Mahdavi Mazdeh; Toktam Shahriari
Addresses: Department of Irrigation and Reclamation Engineering, University of Tehran, Danashkadeh St., Karaj, Iran ' Department of Irrigation and Reclamation Engineering, University of Tehran, Danashkadeh St., Karaj, Iran ' Department of Water Engineering, Imam Khomeini International University, Imam Khomeini International University Blvd., Qazvin, Iran ' School of Environment, College of Engineering, University of Tehran, Iran
Abstract: In this study, the adsorption characteristics of cadmium by the natural zeolite have been experimentally investigated in a circular flume. The effect of various parameters, such as initial cadmium and zeolite concentrations has been studied to get enhanced simulations for the natural conditions. The optimum equilibrium time was found to be 2 to 3 hr, which was independent of initial cadmium concentration. The results showed that the cadmium adsorption increased with an increase in the zeolite doses. The adsorption values increase by decreasing the initial cadmium concentration. The results of this study also showed that the absorption rate of zeolite increases from 33.3 to 123.23 mg.kg−1, but removal percentage of natural zeolite is reduced from 45.45 to 33.6%. In addition, with increasing the zeolite concentration from 3 to 20 gr.lit−1, the absorption rate decreased from 123.23 to 32.5 mg.kg−1. The results showed that pseudo second order model best described the adsorption rate.
Keywords: adsorption; natural zeolite; cadmium; circular flume.
International Journal of Environmental Technology and Management, 2018 Vol.21 No.3/4, pp.174 - 189
Received: 22 Sep 2017
Accepted: 19 Aug 2018
Published online: 22 Feb 2019 *