Surface modified basalt as a photothermal material for improved oily wastewater distillation
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Many industries such as petrochemical, food, mining, pharmaceutical, and metal industries produce enormous amounts of oily wastewater, which has become an urgent environmental concern. Current oily wastewater treatment methods have poor efficiencies, high cost, or unfavorable environmental outcomes. In this work, an efficient, low cost, scalable, and environmentally friendly photothermal membrane is prepared with a TiO2 surface modified basalt membrane for applications in solar steam generation of produced water systems. Owing to its surface chemistry and structure, basalt has been reported as uniquely suitable for oily wastewater purification. The additional TiO2 coating improves hydrophilicity and anti-fouling properties of the membrane, which is especially beneficial for oily wastewater treatment. The basalt membrane was tested in water compositions common to produced water environments including high salinity waters, water with organic contamination, and water with crude oil. The TiO2 coated basalt membrane boasted an impressive 1.423 𝑘𝑔 ∗ 𝑚^-2ℎ𝑟^-1 evaporation rate in a 1 g/L oily water composition. This evaporation rate is over 500% higher than the rate of the 1 g/L oily water evaporation by itself (without any basalt photothermal membrane). This technology is promising to facilitate improved efficiency and resource recovery in oily wastewater storage tanks and evaporation ponds.
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M.S.