Abstract
Cost of lining reservoirs, whether for storage or water treatment, can be made it with different materials. As these structures have a relatively large surface area the investment amount can be economically unfeasible. A sustainable alternative method that can be used is the reduction of water infiltration in the soil, carried out through the use of a chemical dispersant such as Sodium Hydroxide (NaOH). Therefore, the aim of the present research was to define the lower NaOH concentration and volume to be applied in samples of a Red Latosol in the southern region of Minas Gerais state, Brazil. The samples, in triplicate, were treated with 5 NaOH concentrations (0, 5, 10, 15 and 30 g L-1) and 3 volumes per square meter application (5, 15 and 25 L m-2), submitting it to saturated hydraulic conductivity in constant head permeameters tests. The results showed that the application of different concentrations of NaOH reduced the saturated hydraulic conductivity in relation to the control treatment. The ratio of condutivity to NaOH concentration is best represented by the cubic regression y = 22.46 - 6.06x + 0.45x² - 0.01x³ (r² = 0.97). Regarding the different application rates, the difference was not significant indicating equality between the treatments analyzed. Therefore, the use of the 5 g L-1 of NaOH, applied at 5 L m-2, was economically more feasible and could therefore be a low-cost lining alternative.
Highlights
The need to storage water in reservoirs has several purposes, such as for pumped or rainwater storage, water treatment for human or animal supply, or even for cattle or swine wastewater treatment
In order to evaluate the efficiency of NaOH chemical dispersant as an alternative water reservoir lining, soil samples were collected at Federal University of Lavras (UFLA), Lavras, Minas Gerais State, Brazil (21.13° S, 44.58° E)
Variance analysis of saturated hydraulic conductivity in Red Latosol samples under different concentrations and application rates of NaOH are presented in table 2
Summary
The need to storage water in reservoirs has several purposes, such as for pumped or rainwater storage, water treatment for human or animal supply, or even for cattle or swine wastewater treatment. Such water reservoirs and sewage treatment projects needs adequate waterproofing systems to ensure the durability of structures and safety of necessary sanitation operations (MEDEIROS et al, 2011). Material selection will depend on the liquid stored characteristics, structure design, and on structure acceptable movement. Local environmental properties, such as temperature and air moisture, should be considered when selecting the waterproofing technology. Use of concrete, CBUQ asphalt (hot worked bituminous concrete), tarpaulins and chemical dispersant are the most used
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