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10.1016_j.eti.2023.103198.pdf (3.48 MB)

Purification of emulsified oily polluted waters with modified melamine foams

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submitted on 2024-01-23, 04:53 and posted on 2024-01-23, 04:54 authored by Sarah Hailan, Patrik Sobolciak, Peter Kasak, Anton Popelka, Yongfeng Tong, Samer Adham, Igor Krupa

Oil and gas industry operations produce tremendous amounts of wastewater (produced water; PW). Tertiary treatment of the PW in the final treatment stage is challenging due to the presence of colloids with sizes < 500 nm and a low concentration target for the effluent of <10 mg/L. This study was focused on the purification of colloidal PW with modified melamine foams (MFs) and ferric chloride. The modified MFs exhibited superhydrophobic and superoleophilic character due to increasing roughness and complexation of Fe3+ ions within the MF structure. The modified MF showed separation efficiencies up to 86 ± 3% for emulsions containing 120 ppm carbon. The Fe3+ cations changed the hydrophilicities of the foams and made them highly hydrophobic, and they also contributed significantly to the adsorption of negatively charged species, such as crude oil droplets modified with an anionic surfactant (sodium dodecyl sulfate). The demulsification mechanism involved multiple diffusion processes run over different time scales, including diffusion of an emulsion into the foam and diffusion of the oil droplets within the foam, combined with parallel adsorption of the oil droplets onto the solid skeleton of the foam. The adsorption capacity of the MFs increased linearly with increasing initial concentration of crude oil content in the PW. The MFs were reusable for six consecutive cycles.

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Published in: Environmental Technology & Innovation
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Open Access funding provided by the Qatar National Library.



  • English



Publication Year

  • 2023

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This Item is licensed under the Creative Commons Attribution 4.0 International License.

Institution affiliated with

  • Qatar University
  • Center for Advanced Materials - QU
  • College of Arts and Sciences - QU
  • Hamad Bin Khalifa University
  • Qatar Environment and Energy Research Institute - HBKU
  • ConocoPhillips Water Technology Ltd QSTP-B
  • Qatar Science & Technology Park

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