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<p>The fermentation of bioethanol from cellulose as a raw material offers an effective means to mitigate environmental pollution caused by agricultural waste, holding significant economic and ecological importance. However, during the production of cellulosic ethanol fermentation, a significant amount of cellulosic ethanol wastewater (CEW) rich in nutrients is generated. In this research, four strains of oleaginous yeasts (<i>Trichosporon dermatis</i>, <i>Rhodotorula glutinis</i>, <i>Lipomyces starkeyi</i>, and <i>Yarrowia lipolytica</i>) were fermented in CEW. Biomass, lipid content, lipid yield, fatty acid composition, substrate metabolism and chemical oxygen demand (COD) removal were assessed for these strains. The results showed that <i>T. dermatis</i> had the maximum fermentation effectively when biomass is 18.702&#xa0;g/L, lipid content is 9.08%, lipid yield is 1.70&#xa0;g/L and COD removal is 50.8%, respectively. To elucidate the effects of pivotal fermentation parameters, a comprehensive series of single-factor experiments was methodically conducted to evaluate the influences of cultivation temperature, initial pH, inoculation concentration, and carbon–nitrogen ratio (C/N ratio) on the growth characteristics of <i>T. dermatis</i>, and the optimal conditions were 28&#xa0;℃, pH 7.5, inoculation concentration 15%, and C/N ratio 64:1. Meanwhile, fermentation efficiency reached its peak, with biomass, lipid content, lipid yield, and COD removal measured at 18.375&#xa0;g/L, 13.65%, 2.51&#xa0;g/L, and 72%, respectively. Building on these findings, response surface analysis was performed, with COD removal as the primary factor, to identify the optimal process parameters. It was determined that at a pH of 8, an inoculation rate of 15%, and a C/N ratio of 60:1, the COD removal reached its maximum value of 73.7%.</p>

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A Comparative Study on the Efficiency Process of Cellulosic Wastewater Fermentation by Oleaginous Yeasts

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Shimiao Yao,
  • Hailong Li,
  • Ruiling Gao,
  • Xuefang Chen,
  • Can Wang,
  • Lian Xiong,
  • Xinde Chen

摘要

The fermentation of bioethanol from cellulose as a raw material offers an effective means to mitigate environmental pollution caused by agricultural waste, holding significant economic and ecological importance. However, during the production of cellulosic ethanol fermentation, a significant amount of cellulosic ethanol wastewater (CEW) rich in nutrients is generated. In this research, four strains of oleaginous yeasts (Trichosporon dermatis, Rhodotorula glutinis, Lipomyces starkeyi, and Yarrowia lipolytica) were fermented in CEW. Biomass, lipid content, lipid yield, fatty acid composition, substrate metabolism and chemical oxygen demand (COD) removal were assessed for these strains. The results showed that T. dermatis had the maximum fermentation effectively when biomass is 18.702 g/L, lipid content is 9.08%, lipid yield is 1.70 g/L and COD removal is 50.8%, respectively. To elucidate the effects of pivotal fermentation parameters, a comprehensive series of single-factor experiments was methodically conducted to evaluate the influences of cultivation temperature, initial pH, inoculation concentration, and carbon–nitrogen ratio (C/N ratio) on the growth characteristics of T. dermatis, and the optimal conditions were 28 ℃, pH 7.5, inoculation concentration 15%, and C/N ratio 64:1. Meanwhile, fermentation efficiency reached its peak, with biomass, lipid content, lipid yield, and COD removal measured at 18.375 g/L, 13.65%, 2.51 g/L, and 72%, respectively. Building on these findings, response surface analysis was performed, with COD removal as the primary factor, to identify the optimal process parameters. It was determined that at a pH of 8, an inoculation rate of 15%, and a C/N ratio of 60:1, the COD removal reached its maximum value of 73.7%.