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Shale gas produced water (SGPW) contains complex pollutants that pose environmental risks, while membrane distillation (MD) is a promising technology for desalinating SGPW. However, the transport of small volatile molecules (ammonia) in SGPW, across the membrane with water vapor accelerates membrane fouling and deteriorates permeate quality. In this study, a modified zeolite-MD combined process was proposed for treating high salinity SGPW. Zeolite modified with NaOH+NaCl was selected and the surface area and pore size of modified zeolite was increased by 8 % and by 44 %, respectively significantly improving ammonia removal. The zeolite adsorption effluent was filtered and flowed to MD unit for further purification. The modified zeolite at 66 g/L increased the MD flux by 68 % and reduced the permeate conductivity by 32 % than that without adsorption, outperforming the raw zeolite which improved flux by 26 % and decreased conductivity by 28 %. The deposited foulants on MD membrane surface using modified zeolite were reduced by 95 % compared to the raw SGPW and 28 % compared to the raw zeolite. The adsorption of modified zeolite significantly extended the service life and reusability of the MD membranes. Therefore, the proposed modified zeolite adsorption and MD hybrid process is a cost-effective method for treating SGPW.
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DESALINATION
ISSN: 0011-9164
Year: 2024
Volume: 596
8 . 4 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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