Mineral scaling behavior in typical salt-resistant solar interfacial desalination: Edge-preferential crystallization vs. enhanced convection
CHEMICAL ENGINEERING JOURNAL(2023)
摘要
The burgeoning solar interfacial evaporation (SIE) technology reveals enormous prospect to address the global freshwater crisis, but its application might be limited by a grossly neglected problem of inorganic salt scaling. Herein, based on the carbon nanotubes (CNTs)@carbon black (CB)/polyvinyl alcohol (PVA) evaporators, the scaling behavior and its influence on the SIE performance were investigated systematically in the two typical anti-salt modes, including the edge-preferential crystallization (T-type mode) and the enhanced convection with vertically aligned vessels (EC-type mode). The results revealed that the scaling occurred easily in both modes when only Ca2+ and SO42- co-existed in the feed water. Meanwhile, in the T-type mode, the scaling aggravated the NaCl crystallization, resulting in a coverage of NaCl crystals on the whole evaporator surface. For a high salt concentration (10.0 wt% NaCl) with SI(Ca2++SO42-) = -0.13, the evaporation rate seriously decreased to similar to 12.6% of its initial value after 12 h. On the contrary, the scaling behavior was significantly suppressed in the presence of Na+ and Cl- ions in the EC-type mode. Furthermore, the slight scaling presented a negligible effect on the NaCl accumulation, which ensured a stable evaporation rate of 2.58 +/- 0.10 kg m(-2)h(-1) under the same condition (10.0 wt% NaCl and SI of -0.13) for even 12 h irradiation under 2.0 sun. Therefore, it can be emphasized that developing novel evaporators not only requires a good anti-salt ability, but also possesses an excellent resistance to scaling for the practical application of SIE in the future.
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关键词
Solar-drive interfacial evaporation,Seawater desalination,Inorganic salt scaling,Salt crystallization
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