Targeted Pre-Adsorption Enhances Nanofiltration Performance in Petrochemical Wastewater Treatment

Strategic Insights -

Researchers from Beijing Normal University have made significant strides in the field of nanofiltration, demonstrating the effectiveness of targeted pre-adsorption in removing key pollutants from petrochemical wastewater. By combining coal activated carbon and aluminum silica gel in a two-step adsorption process, the team achieved impressive results, including a 95.4% reduction in dissolved organic carbon (DOC) removal and a 92.7% decrease in biotoxicity reduction. The findings offer a promising solution for the long-term, cost-effective treatment of complex wastewater.

Key Takeaways:

  • Targeted stepwise pre-adsorption using coal activated carbon and aluminum silica gel can enhance nanofiltration performance, reducing membrane fouling by 89.4% and maintaining stable nanofiltration performance over five cycles.
  • The surface cake layer contributes 56% of the increased resistance, primarily mitigated by removing colloidal fractions (e.g., FDOM) and hydrophobic fractions (e.g., aromatic compounds and alkanes).
  • The two-step pre-adsorption process extended the service life of the nanofiltration membranes, reduced operating costs by 75%, and decreased carbon emissions by 13.8%.
  • Mechanistic analysis revealed that the removal of multi-component pollutants is crucial for enhancing nanofiltration purification of petrochemical wastewater.
  • The study highlights the potential of targeted pre-adsorption as a feasible option for the deep treatment of complex wastewater.

Statistics:

  • 95.4% DOC removal achieved through targeted two-step adsorption
  • 92.7% biotoxicity reduction achieved through targeted two-step adsorption
  • 89.4% reduction in membrane fouling through targeted two-step adsorption
  • 56% contribution of the surface cake layer to the increased resistance
  • 6.8% decrease in carbon emissions through targeted pre-adsorption process
  • 13.8% decrease in carbon emissions through targeted pre-adsorption process

Sources:

  • Qi, R., Lei, J., Yang, Y., Feng, C. H., et al. (2025). Targeted stepwise pre-adsorption for enhanced nanofiltration removal of dissolved organic pollutants in petrochemical wastewater. Water Research, 287, 124390. doi: 10.1016/j.watres.2023.124390
  • NewsRx (2025, September 1). Investigators at Beijing Normal University Report New Data on Nanofiltration (Targeted stepwise pre-adsorption for enhanced nanofiltration removal of dissolved organic pollutants in petrochemical wastewater). Nanotechnology Weekly, 1095.