Application of Champia kotschyana Harvey biosorbent for cadmium removal: mechanisms and influencing factors
Subject Areas : Soil and water pollution with heavy metals
Maryam Menati
1
,
Parvaneh Tishehzan
2
,
Abdolrahim Hooshmand
3
,
Majid Baghdadi
4
1 - PhD student, Department of Irrigation and Drainage, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 - Assistant Professor, Department of Environmental Engineering, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 - Professor, Department of Irrigation and Drainage, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
4 - Associated Professor, Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran
Keywords: Cadmium, alga, adsorption, isotherm, kinetic,
Abstract :
One way to compensate for water shortages, especially in the agricultural sector, is to use recyclable water, including agricultural water, domestic and industrial wastewater. On the other hand, removing pollutants in these waters is particularly important. Due to the high cost and low efficiency of other pollutant removal methods, biological adsorption methods with low cost have good efficiency for removing pollutants, including cadmium. In this study, cadmium absorption in aqueous solutions was studied using Champia Kotschyana Harvey. Effect of effective variables such as concentration of cadmium ions (0.5-5 mg/L), absorbent value (7-1 gr/L), solution pH (3-8) and contact time (90-90 min) with model response level method became. The design of the Box- Behken was used for experimental data and the best level of independent variables, namely the initial concentration of cadmium ion, pH, contact time and adsorbent value, were selected. Under suitable conditions (pH=4, adsorbent value = 1.5 g/L, contact time = 36.53 min, cadmium initial concentration = 3.3 mg/L) adsorption capacity and cadmium removal percentage, respectively 3/1 mg/ g and 80/14 obtained. Kinetic and isotherm studies showed that the second-order Kinetic model and the isotherm Langmuir well corresponded to cadmium absorption data. According to the results, the Champia K. Harvey alga biomass can be used to adsorb cadmium from aqueous solutions.