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<p>This study explores the sustainable production and multifunctional applications of rhamnolipids synthesized by <i>Pseudomonas aeruginosa</i> using olive mill wastewater (OMW) as a low-cost, renewable substrate. Under optimized conditions (pH 7, 30&#xa0;°C, 120&#xa0;rpm), the culture achieved a high biomass density (OD = 13.51 ± 0.48). Biosurfactant production was confirmed by a reduction in surface tension (42.0 mN/m), a strong emulsification index (72.22%), and enhanced oil displacement compared to synthetic surfactants. The rhamnolipid yield reached 6&#xa0;g/L. Antimicrobial assays showed no inhibitory effect against <i>E. coli</i>, <i>S. aureus</i>, or <i>S. typhimurium</i> at concentrations up to 3&#xa0;g/L, indicating a low toxicity profile. Seed germination assays revealed significant stimulation in <i>Trigonella foenum-graecum</i> and <i>Zea mays</i>, with peak germination indices of 151.71% and 176.83% at 0.5&#xa0;g/L and 0.75&#xa0;g/L, respectively. The novelty of this study lies in the dual approach of simultaneous OMW detoxification and the production of rhamnolipids with plant growth-promoting potential. Overall, this work highlight the promise of rhamnolipids as eco-friendly agents for agricultural applications, while contributing to waste valorization and environmental protection.</p>

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Bioconversion of olive mill wastewater into rhamnolipids with biostimulant potential

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Ben Arif Meriem,
  • Lazzem Assia,
  • Gamraoui Afef,
  • Landoulsi Ahmed,
  • Chatti Abdelwaheb

摘要

This study explores the sustainable production and multifunctional applications of rhamnolipids synthesized by Pseudomonas aeruginosa using olive mill wastewater (OMW) as a low-cost, renewable substrate. Under optimized conditions (pH 7, 30 °C, 120 rpm), the culture achieved a high biomass density (OD = 13.51 ± 0.48). Biosurfactant production was confirmed by a reduction in surface tension (42.0 mN/m), a strong emulsification index (72.22%), and enhanced oil displacement compared to synthetic surfactants. The rhamnolipid yield reached 6 g/L. Antimicrobial assays showed no inhibitory effect against E. coli, S. aureus, or S. typhimurium at concentrations up to 3 g/L, indicating a low toxicity profile. Seed germination assays revealed significant stimulation in Trigonella foenum-graecum and Zea mays, with peak germination indices of 151.71% and 176.83% at 0.5 g/L and 0.75 g/L, respectively. The novelty of this study lies in the dual approach of simultaneous OMW detoxification and the production of rhamnolipids with plant growth-promoting potential. Overall, this work highlight the promise of rhamnolipids as eco-friendly agents for agricultural applications, while contributing to waste valorization and environmental protection.