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Open AccessArticle

Zwitterion-Modified Ultrafiltration Membranes for Permian Basin Produced Water Pretreatment

1
Center for Energy and Environmental Sustainability, Prairie View A&M University, Prairie View, TX 77446, USA
2
Department of Civil and Environmental Engineering, Prairie View A&M University, Prairie View, TX 77446, USA
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1710; https://doi.org/10.3390/w11081710
Received: 5 July 2019 / Revised: 14 August 2019 / Accepted: 15 August 2019 / Published: 17 August 2019
Unconventional oil and gas extraction generates large quantities of produced water (PW). Due to strict environmental regulations, it is important to recover and reuse PW. In this study, commercial polyethersulfone (PES) ultrafiltration (UF) membranes were surface-modified with zwitterionic polymer 3-(3,4-Dihydroxyphenyl)-l-alanine (l-DOPA) solution to alleviate membrane fouling during the ultrafiltration of shale oil PW of the Permian Basin. UF membranes were coated in l-DOPA solution by using a dip coating technique. Membrane characterization tests confirmed successful l-DOPA coating on UF membranes. While performing the experiments, permeate flux behaviors of the uncoated and coated membranes and antifouling resistance of the zwitterionic coating were evaluated. Among the coated UF membranes with varying coating times from one day to three days, the three-day coated UF membrane showed a good flux performance and the highest fouling resistance. The flux reduced by 38.4% for the uncoated membrane, while the reduction was 16% for the three-day coated membrane after the 5 h ultrafiltration of PW. Both improvements of the flux performance and recovery ratio are attributed to a negatively-charged surface developed on the membranes after the zwitterionic coating. The UF pretreatment also improved the flux behavior of the later forward osmosis (FO) process for PW treatment. View Full-Text
Keywords: ultrafiltration; zwitterionic modification; hydrophilicity; produced water ultrafiltration; zwitterionic modification; hydrophilicity; produced water
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MDPI and ACS Style

Babayev, M.; Du, H.; Botlaguduru, V.S.V.; Kommalapati, R.R. Zwitterion-Modified Ultrafiltration Membranes for Permian Basin Produced Water Pretreatment. Water 2019, 11, 1710.

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