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Article

Gypsum Crystallization during Reverse Osmosis Desalination of Water with High Sulfate Content in Presence of a Novel Fluorescent-Tagged Polyacrylate

1
JSC “Fine Chemicals R&D Centre”, Krasnobogatyrskaya, str. 42, b. 1, 107258 Moscow, Russia
2
Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125047 Moscow, Russia
3
Moscow State University of Civil Engineering, Yaroslavskoe shosse, 26, 129337 Moscow, Russia
4
Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str., 38, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(4), 309; https://doi.org/10.3390/cryst10040309
Received: 17 March 2020 / Revised: 9 April 2020 / Accepted: 14 April 2020 / Published: 16 April 2020
(This article belongs to the Special Issue Advances in Industrial Crystallization)
Gypsum scaling in reverse osmosis (RO) desalination process is studied in presence of a novel fluorescent 1,8-naphthalimide-tagged polyacrylate (PAA-F1) by fluorescent microscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS) and a particle counter technique. A comparison of PAA-F1 with a previously reported fluorescent bisphosphonate HEDP-F revealed a better PAA-F1 efficacy, and a similar behavior of polyacrylate and bisphosphonate inhibitors under the same RO experimental conditions. Despite expectations, PAA-F1 does not interact with gypsum. For both reagents, it is found that scaling takes place in the bulk retentate phase via heterogeneous nucleation step. The background “nanodust” plays a key role as a gypsum nucleation center. Contrary to popular belief, an antiscalant interacts with “nanodust” particles, isolating them from calcium and sulfate ions sorption. Therefore, the number of gypsum nucleation centers is reduced, and in turn, the overall scaling rate is diminished. It is also shown that, the scale formation scenario changes from the bulk medium, in the beginning, to the sediment crystals growth on the membrane surface, at the end of the desalination process. It is demonstrated that the fluorescent-tagged antiscalants may become very powerful tools in membrane scaling inhibition studies. View Full-Text
Keywords: reverse osmosis; membrane fouling; gypsum scaling; fluorescent-tagged polyacrylate; fluorescence; scale inhibition mechanisms reverse osmosis; membrane fouling; gypsum scaling; fluorescent-tagged polyacrylate; fluorescence; scale inhibition mechanisms
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MDPI and ACS Style

Oshchepkov, M.; Golovesov, V.; Ryabova, A.; Redchuk, A.; Tkachenko, S.; Pervov, A.; Popov, K. Gypsum Crystallization during Reverse Osmosis Desalination of Water with High Sulfate Content in Presence of a Novel Fluorescent-Tagged Polyacrylate. Crystals 2020, 10, 309. https://doi.org/10.3390/cryst10040309

AMA Style

Oshchepkov M, Golovesov V, Ryabova A, Redchuk A, Tkachenko S, Pervov A, Popov K. Gypsum Crystallization during Reverse Osmosis Desalination of Water with High Sulfate Content in Presence of a Novel Fluorescent-Tagged Polyacrylate. Crystals. 2020; 10(4):309. https://doi.org/10.3390/cryst10040309

Chicago/Turabian Style

Oshchepkov, Maxim; Golovesov, Vladimir; Ryabova, Anastasia; Redchuk, Anatoly; Tkachenko, Sergey; Pervov, Alexei; Popov, Konstantin. 2020. "Gypsum Crystallization during Reverse Osmosis Desalination of Water with High Sulfate Content in Presence of a Novel Fluorescent-Tagged Polyacrylate" Crystals 10, no. 4: 309. https://doi.org/10.3390/cryst10040309

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