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<p>Although microalgae-based wastewater treatment has the&#xa0;potential to recover&#xa0;nutrients and capture&#xa0;carbon, efficient biomass harvesting remains energy-intensive. This study evaluated electrocoagulation-flotation (ECF) for simultaneous microalgae separation and chemical oxygen demand (COD) reduction in real landfill leachate. A microalgal consortium was cultivated directly in landfill leachate at low (OD<sub>680</sub> = 0.3)&#xa0;and high biomass densities (OD<sub>680</sub> = 2.2) and treated in a 0.5-L batch ECF reactor operated under a low-duty pulsed-voltage regime (5.0&#xa0;V for 0.1&#xa0;s and 1.5&#xa0;V for 29.9&#xa0;s) for 30&#xa0;min. ECF achieved separation efficiencies of&#xa0;99.7% and 94.7% for&#xa0;low and high biomass, respectively, with mass-based specific energy ranging from 0.22&#xa0;to&#xa0;0.40 kWh kg<sup>−1</sup> total solids and volumetric energy from&#xa0;0.33&#xa0;to&#xa0;0.38 kWh m<sup>−3</sup>. The&#xa0;COD of&#xa0;low biomass microalgae decreased from 715 ± 12&#xa0;mg O<sub>2</sub> L<sup>−1</sup> (raw leachate) to 564 ± 14&#xa0;mg O<sub>2</sub> L<sup>−1</sup> after ECF i.e. 21% reduction. These results&#xa0;show that ECF can&#xa0;effectively combine microalgae harvesting and partial organic pollutant removal in challenging wastewater matrices. This offers a promising low-energy strategy for the&#xa0;combined treatment and resource recovery in landfill leachate management. </p> Graphical Abstract <p></p>

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Simultaneous microalgae separation and COD reduction from landfill leachate using electrocoagulation-flotation

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Marvin Bruns,
  • Alexander Kuss,
  • Peter Kern,
  • Christian Wolf,
  • Himanshu Himanshu

摘要

Although microalgae-based wastewater treatment has the potential to recover nutrients and capture carbon, efficient biomass harvesting remains energy-intensive. This study evaluated electrocoagulation-flotation (ECF) for simultaneous microalgae separation and chemical oxygen demand (COD) reduction in real landfill leachate. A microalgal consortium was cultivated directly in landfill leachate at low (OD680 = 0.3) and high biomass densities (OD680 = 2.2) and treated in a 0.5-L batch ECF reactor operated under a low-duty pulsed-voltage regime (5.0 V for 0.1 s and 1.5 V for 29.9 s) for 30 min. ECF achieved separation efficiencies of 99.7% and 94.7% for low and high biomass, respectively, with mass-based specific energy ranging from 0.22 to 0.40 kWh kg−1 total solids and volumetric energy from 0.33 to 0.38 kWh m−3. The COD of low biomass microalgae decreased from 715 ± 12 mg O2 L−1 (raw leachate) to 564 ± 14 mg O2 L−1 after ECF i.e. 21% reduction. These results show that ECF can effectively combine microalgae harvesting and partial organic pollutant removal in challenging wastewater matrices. This offers a promising low-energy strategy for the combined treatment and resource recovery in landfill leachate management.

Graphical Abstract