Dehydration method for a liquid or gaseous effluent selected from LPG, gasoline, diesel, kerosene, solvents and natural gases, by inserting the liquid or gaseous effluent against gravity through a drying column having a drying bed with an initial height (H+h) constituted in its lower area by an inert material bed having the height of h and in its upper area by deliquescent desiccants having an initial height of H. The deliquescent desiccants have an initial weight of between 3 and 40 g, the h/H ratio is lower than 0.49, and the inert material has a specific surface area greater than 100 m2/m3 and lower than 800 m2/m3. The method further includes separating water obtained from the liquid or gaseous effluent.