Iranian Journal of Irrigation & Drainage

Iranian Journal of Irrigation & Drainage

Investigation of Reducing the Salinity of Agricultural Drainage Water Using Cocopeat Adsorbent

Document Type : Original Article

Authors
Sara Hoveizavi 1
Parvaneh Tishehzan 2
Abdolrahim hooshmand 3
1 Ph.D. 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.
Abstract
Water resource limitations have made using unconventional waters such as drainage water important. Cocopeat is a type of growing medium that is commonly used in greenhouses. This research aimed to investigate the application of cocopeat adsorbent in reducing the salinity of agricultural drainage water simulated with sodium chloride salt at salinity levels of 4, 8, 12, 16, and 20 dS/m. For this purpose, the effect of independent variables pH, adsorbent dosage, contact time, and initial EC at 5 different levels on the adsorption efficiency of sodium and chloride ions was evaluated using the Taguchi experimental design method. The results showed under optimal conditions (pH equal to 6, an adsorbent dosage of 40 g/L, a contact time of 180 min, and an initial EC of 20 dS/m), the maximum adsorption efficiency of sodium and chloride ions is 20.03% and 20.14%, respectively. To validate this estimate, an experiment was conducted under the mentioned optimal conditions, and the adsorption efficiency of sodium and chloride ions was obtained at 20.71% and 20.81%, respectively. Investigating kinetic and isotherm models of the adsorption of sodium and chloride ions showed that the experimental data have a better match with the pseudo-second-order kinetic model and the Langmuir isotherm model. According to this research, cocopeat has the ability to reduce the electrical conductivity of saline water by about 20%.
Keywords
Adsorbent
Cocopeat
Drainage water
Experimental design
Taguchi
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Iranian Journal of Irrigation & Drainage
Volume 18, Issue 3 - Serial Number 106
July and August 2024
Pages 421-432