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<p>Microalgae offer a promising and greener route towards sustainable energy production by addressing the twin problems of fossil fuel dependence and increasing atmospheric CO₂ concentration. They are an ideal candidate for integrated operations because of their short generation time, metabolite storage capacity wastewater remediating capacity. However, the small size and negative surface charge on microalgal cells are factors that impedes cost effective biomass recovery. In the present study, <i>Chlamydomonas reinhardtii</i> was grown in mixed nutrition using acetate and a CO₂-air mixture of 7% (v/v) and the different harvesting techniques were analyzed. Electro-flocculation was the most efficient strategy and the process intensification with in situ setup allowed &gt; 90% biomass recovery in 45&#xa0;min, under the optimum conditions (14&#xa0;V, 4&#xa0;cm inter-electrode distance, 40&#xa0;cm² electrode area). Compared to conventional centrifugation, the present method uses 78% less energy, thereby enhancing the overall process energy of the biofuel production chain, contributing to SDG. The harvested biomass was subsequently utilized in a biorefinery approach yielding biodiesel (0.38 ± 0.02&#xa0;g g⁻¹), and bioethanol (0.48&#xa0;g g⁻¹), achieving an overall 30% energy recovery from the substrate. By deploying a state-of -the art electro-flocculation set-up, this study demonstrates how innovative harvesting techniques can be integrated in the biofuel pipelines. Through the synergistic integration of low energy harvesting of algal biomass for clean energy production (SDG 7), and carbon capture (part of SDG 13) this study advances the development of resource efficient biofuel production platform, aligning with the global sustainability goals.</p> Graphical Abstract <p></p>

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Advancing algal biorefineries: In-situ electroflocculation for biomass recovery for biofuel production

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Sanjukta Banerjee,
  • Ananta K Ghosh,
  • Debabrata Das

摘要

Microalgae offer a promising and greener route towards sustainable energy production by addressing the twin problems of fossil fuel dependence and increasing atmospheric CO₂ concentration. They are an ideal candidate for integrated operations because of their short generation time, metabolite storage capacity wastewater remediating capacity. However, the small size and negative surface charge on microalgal cells are factors that impedes cost effective biomass recovery. In the present study, Chlamydomonas reinhardtii was grown in mixed nutrition using acetate and a CO₂-air mixture of 7% (v/v) and the different harvesting techniques were analyzed. Electro-flocculation was the most efficient strategy and the process intensification with in situ setup allowed > 90% biomass recovery in 45 min, under the optimum conditions (14 V, 4 cm inter-electrode distance, 40 cm² electrode area). Compared to conventional centrifugation, the present method uses 78% less energy, thereby enhancing the overall process energy of the biofuel production chain, contributing to SDG. The harvested biomass was subsequently utilized in a biorefinery approach yielding biodiesel (0.38 ± 0.02 g g⁻¹), and bioethanol (0.48 g g⁻¹), achieving an overall 30% energy recovery from the substrate. By deploying a state-of -the art electro-flocculation set-up, this study demonstrates how innovative harvesting techniques can be integrated in the biofuel pipelines. Through the synergistic integration of low energy harvesting of algal biomass for clean energy production (SDG 7), and carbon capture (part of SDG 13) this study advances the development of resource efficient biofuel production platform, aligning with the global sustainability goals.

Graphical Abstract