THE COMBINED EFFECT OF HYDROGEL TYPE AND ACCOMPANYING CATION ON CHLORIDE TRANSPORT IN A SATURATED SANDY LOAM SOIL

Nassar, Ibrahim; Ahmed, Hosam; Ebrahim Shehata, Ebrahim A

doi:10.21608/jaesj.2024.320228.1198

THE COMBINED EFFECT OF HYDROGEL TYPE AND ACCOMPANYING CATION ON CHLORIDE TRANSPORT IN A SATURATED SANDY LOAM SOIL

Document Type : Full research articles

Authors

¹ Soil Science and Agricultural Engineering, Faculty of Agriculture, Damanhour University

² Department of Natural Resources & Agricultural Engineering Faculty of Agriculture, Damanhour University, Damanhour, Egypt

³ Department of Natural Resources and Agricultural Engineering ,Faculty of Agriculture , Damanhour University

10.21608/jaesj.2024.320228.1198

Abstract

Chloride (Cl^-) transport in soil can be affected by amendments such as sodium polyacrylate (SAP) and polyacrylamide (CLP). Four levels (0.0, 0.1, 0.3 and 0.5% w/w) for either SAP/CLP were mixed with sandy loam soil then packed in PVC columns (25 cm - long and 4.5 cm - inner diameter). Breakthrough curves (BTC) were established using a replacement fluid of either potassium or calcium chloride at a concentration of 0.1 molar under a head pressure of 2 cm then described using the program of CXTFIT. The dispersion (D), dispersivity (α), and retardation coefficient (R) of Cl^- were obtained by the program. The CXTFIT described the observed data of BTC well with a determination coefficient of more than 0.97. According to the dispersivity criteria, all the studied treatment possessed a preferential flow, but the CLP 0.5% treated soil using CaCl₂ soil had a matrix flow/dispersive flow. The reported results of average pore-water velocity (v), D), and α decreased significantly as the rates of both hydrogels increased. Contradictory, the observed complete breakthrough times and R increased significantly as the rates of both hydrogels increased. This time was longer using the KCl replacement solution than using that of the CaCl₂ solution. It is obvious that using CaCl₂ with CLP-treated soils was vital for reducing the dispersion coefficient and boosting the retardation coefficient. The use of hydrogel appears to be a good option for controlling leaching of such a compound. The results of the present work might be a platform towards controlling and managing the water resource contamination by nonorganic or organic compounds.

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