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Temperature is an underestimated parameter to regulate the start-up of enhanced carbon chain elongation

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  • Ren, Weiping
  • He, Pinjing
  • Zhang, Hua
  • Lü, Fan

Abstract

Temperature is an important environmental factor for optimized bioreactions. In this study, seven temperatures between 25 and 55 °C were undertaken to explore the product spectrums of carbon chain elongation in a mixed culture. Temperature was manifested to significantly affect the production rate, productivity, and selectivity of carbon chain elongation. 40 °C resulted in the highest caproate concentration (138.94 mmol-C/L) and the highest caproate selectivity up to 84.5 %. Combining microbial quantitative and diversity analysis, it was identified that the optimized temperature was owing to the competitive abilities of metabolically different species. The dominant bio-elongation Clostridium kluyveri preferred 35–45 °C. The competitive fermentative bacteria Clostridium magnum and Clostridium butyricum for acetate and butyrate anabolism preferred 25–35 °C, therefore, excluding lower temperature bio-elongation because of more acetate and butyrate conversion but not caproate. Metabolically diverse Pseudomonas sp was abundant at higher temperatures (50–55 °C) and longer duration, therefore, excluding thermophilic bio-elongation because of reduced caproate productivity.

Suggested Citation

  • Ren, Weiping & He, Pinjing & Zhang, Hua & Lü, Fan, 2024. "Temperature is an underestimated parameter to regulate the start-up of enhanced carbon chain elongation," Renewable Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:renene:v:234:y:2024:i:c:s0960148124012898
    DOI: 10.1016/j.renene.2024.121221
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    References listed on IDEAS

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    1. Liu, Yuhao & He, Pinjing & Han, Wenhao & Shao, Liming & Lü, Fan, 2020. "Outstanding reinforcement on chain elongation through five-micrometer-sized biochar," Renewable Energy, Elsevier, vol. 161(C), pages 230-239.
    2. Nie, Erqi & He, Pinjing & Zhang, Hua & Hao, Liping & Shao, Liming & Lü, Fan, 2021. "How does temperature regulate anaerobic digestion?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
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