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Cleaning and Management of Water Contaminated with Pesticides through the Process of Adsorption in the Natural Clay of Brari

Behrami Esad, Berbatovci Isak, Xhaxhiu Kledi, Isak Nensi, Andoni Adelaida, Reka Arianit, Hamiti Xhuljeta, Musliu Zehra Hajrulai, Uzunov Risto

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 2

281--291

This study aimed to investigate the potential for widespread application of clay in the purification of water polluted with pesticides and water management through the absorption and desorption of dimethoate and methomyl in the natural clay of Brari (Tirana). While the maximum adsorption of methomyl on Brari clay was reached in 12 hours, the maximum adsorption of dimethoate on Brari clay was reached in 48 hours. To compare the adsorption of methomyl and dimethoate on Brari clay, their water degradation time was also taken into account. Dimethoate dissolves quickly; a contact period of 1–2 hours is sufficient to desorb 81.2% of the material. Dimethoate dissolves in water at 25 °C and has a half-life t1/2 = 30 days. Methomyl is desorbed even faster; in just two hours, 96.2% of the material is desorbed. At 25 °C, dimethoate has a half-life of t1/2 = 14 days and a high solubility of 58 g/L in water. Because methomyl and dimethoate bind poorly to clay, they can contaminate surface and groundwater.

Cleaning of Pesticide-Contaminated Water Using Natural Clays

Behrami Esad, Avdiu Vahid

Journal of Ecological Engineering

2023

Vol. 24, nr 6

13--24

The primary purpose of this research was the study of two natural clays Dardha (Korçë), which is located at 40°31'16.59'' N and 20°49'33.69'' E and the clay of Brari (Tirana), 41°21'14.49'' N and 19°50'17.74'' E for the removal of dimethoate, in order to clean the waters polluted with this pesticide. During the Clay-water+dimethoate contact time from 0 to 24 hours, there was spontaneous hydrolysis of dimethoate, which also theoretical data accurately explains this phenomenon. Clay-water+dimethoate contact time longer than 120 hours are not of interest for this study, because after this time there is no adsorption of dimethoate. Our experimental study focused on contact times from 24 to 120 hours. The adsorption process of dimethoate with concentrations of 0.2 mg/mL was studied; 0.3 mg/mL and 0.5 mg/mL in the natural clays of Dardhe and Brari. The desorption process of dimethoate from these clays was also studied. The desorption process was fast, where in the first two hours of contact 80 to 95% dimethoate was desorbed.