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Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
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Carbonized Dual-Layer Balsa Wood Membrane for Efficient Oil-Water Separation in Kitchen Applications.

Mamadou Souare1, Changqing Dong1,2, Xiaoying Hu1

  • 1National Engineering Laboratory for Biomass Power Generation Equipment, School of New Energy, North China Electric Power University, Beijing 102206, China.

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|June 25, 2025
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Summary

This study introduces a novel wood-based membrane for treating oily kitchen wastewater. The innovative design significantly improves separation efficiency and reduces fouling, offering a sustainable solution for wastewater treatment.

Keywords:
carbonized balsa woodhydrophobicity/hydrophilicitykitchen wastewateroil–water separation

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Wood-based membranes are promising for oily wastewater treatment due to their structure and durability.
  • Conventional methods face challenges like toxic chemicals, secondary pollution, and membrane fouling.
  • Fouling reduces performance and increases resource loss in wastewater treatment processes.

Purpose of the Study:

  • To develop an innovative, sustainable bilayer wood-based membrane for efficient oily kitchen wastewater treatment.
  • To enhance membrane performance by improving hydrophobicity and reducing fouling.
  • To evaluate the membrane's separation efficiency, flux, fouling resistance, mechanical properties, and selective wettability.

Main Methods:

  • Fabrication of a bilayer membrane from balsa wood.
  • Combining a hydrophilic longitudinal layer with a polydimethylsiloxane (PDMS)-impregnated carbonized transverse layer.
  • Characterization of membrane performance through permeation flux, separation efficiency, fouling resistance, mechanical tests, and wettability measurements.

Main Results:

  • Achieved a high permeation flux of 1176.86 Lm⁻² h⁻¹ and separation efficiency of 98.60%.
  • Demonstrated a significant reduction in fouling by 98.38% and maintained low fouling resistance (<3%) over 20 cycles.
  • Exhibited excellent selective wettability with distinct water and oil contact angles and low sliding angles, alongside robust mechanical properties (10.92 MPa tensile strength).

Conclusions:

  • The developed carbonized wood-based bilayer membrane offers a sustainable and effective solution for oily kitchen wastewater treatment.
  • The innovative design overcomes limitations of conventional methods, showing high efficiency and durability.
  • The membrane's properties suggest strong potential for large-scale application in environmental remediation.