Title: Correction of the aggressiveness of desalinated water by mixing of treated seawater - case of Western Algeria
Authors: Maamar Mokadem; El-Amine Cherif; Benamar Bekhti
Addresses: University of Science and Technology Mohamed Boudiaf, USTO-MB, BP 1505 El M'naouer, 31000 Oran, Algeria ' University of Science and Technology Mohamed Boudiaf, USTO-MB, BP 1505 El M'naouer, 31000 Oran, Algeria ' University of Science and Technology Mohamed Boudiaf, USTO-MB, BP 1505 El M'naouer, 31000 Oran, Algeria
Abstract: Several countries suffering from a water deficit have opted for the desalination of seawater and salty waters, but the corrosive quality of the permeate produced by reverse osmosis stations remains a critical factor which does not meet the standards in force and it is not suitable for direct consumption by the population because corrosive water promotes the dissolution of toxic metals such as lead and copper, and increases the appearance of leaks in distribution networks. To improve the mineralisation of water to correct its corrosivity and guaranteeing the carbon-carbon balance of post-treatments are necessary. Several strategies are used, namely adding lime, CO2 to the permeate, and percolation of the permeation on the filtering calcite. The technique of mixing the permeate with 1% of treated seawater has been studied and has presented a very interesting economic advantage. To assess the quality of the water produced before distribution, changes in various indicators, in particular salinity, the Langelier saturation index, were analysed.
Keywords: remineralisation; seawater reverse osmosis; corrosivity; calco-carbonic equilibrium.
International Journal of Hydrology Science and Technology, 2022 Vol.13 No.3, pp.298 - 304
Received: 17 Apr 2020
Accepted: 05 Aug 2020
Published online: 07 Apr 2022 *