Abstract

FLORES-PRIETO, José Jassón et al. Solar Brackish Water Treatment for Irrigation Using Low-Pressure Nanofiltration. Tecnol. cienc. agua [online]. 2015, vol.6, n.6, pp.5-17. ISSN 2007-2422.

This work relates a solution for brackish water treatment by low pressure NF using photovoltaic energy oriented to offer space to agricultural activities in remote areas. The study area was the sub basin Aj of the Pánuco River basin, in the RH26 hydrological region of the Chihuahua desert, which was considerate representative of endorheic basins around sampling zone. The raw water had high content of sulfate (1863 mg/l), which mainly demerits its quality. The total dissolved solids (TDS) were 2 195 mg/l. A photovoltaic low pressure nanofiltration treatment was proposed to primarily remove sulfates (divalent oin). The treatment was studied using synthetic and raw water, determining the removal efficiency of TDS and sulfates, the specific energy, the daily production and the viability of its field operation. In the results, the removal efficiency of TDS, the specific energy and the productivity were significantly associated with irradiation, and then linear correlations were obtained for each case. Sulfates and TDS were removed 98.21 and 75.15%, respectively, at equal or higher level of irradiation of 750 W/m2 and specific energy of 1.94 kWh/m3. Under field conditions, the permeate productivity was 3.2 m3/day, at average insolation of 6.3 peak-sun-hours/day, above PV modules. The continuous operation of the desalination system by users during four months, without specialized assistance, showed feasibility of the proposed solution.

Keywords : Nanofiltration photovoltaic; solar desalination nanofiltration low pressure; solar irrigation.

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