TY - JOUR
T1 - Behaviour of aquaporin forward osmosis flat sheet membranes during the concentration of calcium-containing liquids
AU - Omir, Alibek
AU - Satayeva, Aliya
AU - Chinakulova, Aigerim
AU - Kamal, Arailym
AU - Kim, Jong
AU - Inglezakis, Vassilis J.
AU - Arkhangelsky, Elizabeth
N1 - Funding Information:
Funding: This study was supported by Nazarbayev University, grant number 110119FD4533.
Publisher Copyright:
© 2020 by the authors.
PY - 2020/5
Y1 - 2020/5
N2 - This study aims to examine the scaling and performance of flat sheet aquaporin FO membranes in the presence of calcium salts. Experiments showed that the application of calcium sulphate (CaSO4) resulted in an 8%–78% decline in the water flux. An increase in the cross-flow velocity from 3 to 12 cm/s reduced the decline in the flux by 16%. The deposition of salt crystals on the membrane surface led to the alteration in the membrane’s intrinsic properties. Microscopy, attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, and X-Ray fluorescence (XRF) analyses confirmed measurements of the zeta potential and contact angle. The use of a three-salt mixture yielded severe scaling as compared with the application of calcium sulphate dehydrate (CaSO4 × 2H2O), i.e., a result of two different crystallisation mechanisms. We found that the amount of sodium chloride (NaCl), saturation index, cross-flow velocity, and flow regime all play an important role in the scaling of aquaporin FO flat sheet membranes.
AB - This study aims to examine the scaling and performance of flat sheet aquaporin FO membranes in the presence of calcium salts. Experiments showed that the application of calcium sulphate (CaSO4) resulted in an 8%–78% decline in the water flux. An increase in the cross-flow velocity from 3 to 12 cm/s reduced the decline in the flux by 16%. The deposition of salt crystals on the membrane surface led to the alteration in the membrane’s intrinsic properties. Microscopy, attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, and X-Ray fluorescence (XRF) analyses confirmed measurements of the zeta potential and contact angle. The use of a three-salt mixture yielded severe scaling as compared with the application of calcium sulphate dehydrate (CaSO4 × 2H2O), i.e., a result of two different crystallisation mechanisms. We found that the amount of sodium chloride (NaCl), saturation index, cross-flow velocity, and flow regime all play an important role in the scaling of aquaporin FO flat sheet membranes.
KW - Aquaporin
KW - Calcium
KW - Forward osmosis (FO)
KW - Membrane
KW - Scaling
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U2 - 10.3390/membranes10050108
DO - 10.3390/membranes10050108
M3 - Article
AN - SCOPUS:85085275095
SN - 2077-0375
VL - 10
JO - Membranes
JF - Membranes
IS - 5
M1 - 108
ER -