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- W4315640863 abstract "In this study, we examined pressure-retarded osmosis (PRO) performance using naturally high temperature NaHCO3-enriched geothermal water (i.e., capturing CO2 waste gas) and geothermal brine. The results showed that increasing draw solution temperature from 20 °C to 60 °C, NaHCO3-enriched geothermal water facilitated improving water flux (Jw) without compromising reverse salt flux (Js), leading to lower Js/Jw ratios compared to NaCl-based solution. With NaHCO3-enriched geothermal water (60 °C) as draw solution, periodically physical cleaning (clean water flushing with/without air sparging, osmotic backwashing) displayed ∼17 % lower permeability recovery ratio (p < 0.05), dissimilar foulant morphology and inorganic compositions compared to chemical cleaning (acid, base, NaClO); while the average permeability levels under both cleaning conditions were comparable (p > 0.05). However, the recovery ratio decreased with extending cleaning cycle, resulting in an almost comparable permeability to that without cleaning after 60-h operation. In addition, the presence of Ca2+ at 5 mM in the NaHCO3-enriched geothermal water (60 °C) led to more significant water flux drop and less reverse flux decrease compared to those with Ca2+ at 0 and 30 mM, possibly due to its dense fouling layer formed by smaller-sized CaCO3 precipitates. When geothermal brine (low or high salinity, pH = 3 or 9.7, 60 °C) was used as draw solution, it was noticed that (1) with low salinity brine, basic pH levels led to higher water fluxes; (2) with high salinity brine, the water flux was impacted by the ionic compositions of draw solutions, instead of pH levels." @default.
- W4315640863 created "2023-01-12" @default.
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- W4315640863 date "2023-02-01" @default.
- W4315640863 modified "2023-10-18" @default.
- W4315640863 title "Fouling behaviours and mitigation in pressure-retarded osmosis processes with geothermal water/brine-based draw solutions" @default.
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- W4315640863 doi "https://doi.org/10.1016/j.jwpe.2023.103485" @default.
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