Contamination Potential of Specific Ions in Soil Treated With Reject Brine From Desalination Plants

Abstract

-Percolation columns constructed in the Laboratory can predict the degree of contamination in soil due to reject brine disposal and can be a tool for reducing environmental impacts. This study aim to evaluate the mobilization of ions in reject brine from desalination process by reverse osmosis. The mobilization of the contaminant ions in the saline waste was studied in glass percolation columns, which were filled with soil of contrasting textures (eutrophic CAMBISOL, typic dystrophic Red OXISOL, ENTISOL Quartzipsamment). Experiments ware repeated three times each, and the initial and final concentrations of the ion contaminants were analyzed. The pollution potential of this wastewater was determined by the retardation factor and dispersion-diffusion coefficient of K + , Cl -and Na + for each studied soil. The differences in the displacement curves of the ions present in the saline waste among various soil types were analyzed. The Entisol Quartzipsamment showed a higher forward speed of the ions K + and Cl -(greater retardation factor, i.e., greater power of the subsurface contamination for these ions). In typic dystrophic Red OXISOL, the ions move with greater ease and therefore produced greater groundwater contamination. In eutrophic CAMBISOL, the low coefficient of diffusion-dispersion in all ions was evaluated (i.e., reduced ion mobility is directly influenced by their exchangeable levels).Keywords: Semi-arid. Water reuse. Reverse osmosis. POTENCIAL CONTAMINANTE DE ÍONS ESPECÍFICOS EM SOLOS TRATADOS COM

Dynamics of Ions in Soils Irrigated with Saline Reject

“…The use of water with high contents of salts results in the salinization of agricultural soils, causing disorders of physical and chemical nature in these soils, besides limiting crop development (Miranda et al, 2011;Mesquita et al, 2015;Sá et al, 2015). Since the water in some wells has high content of salts, desalinators have become necessary to make its use viable, and reverse osmosis desalination is one of the most employed techniques in arid and semi-arid regions (Santos et al, 2010a;Cosme et al, 2011;Oliveira et al, 2016).…”