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Enhanced fermentative lactic acid production from source-sorted organic household waste: Focusing on low-pH microbial adaptation and bio-augmentation strategy

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

DOI

  • Zengshuai Zhang, Danmarks Tekniske Universitet
    • ,
  • Panagiotis Tsapekos, Danmarks Tekniske Universitet
    • ,
  • Merlin Alvarado-Morales, Danmarks Tekniske Universitet
    • ,
  • Xinyu Zhu, Danmarks Tekniske Universitet
    • ,
  • Athanasios Zervas
  • Carsten S. Jacobsen
  • Irini Angelidaki, Danmarks Tekniske Universitet

Lactic acid (LA) production at low pH could significantly reduce the need for neutralizing agents, leading to reduction of operational costs. In the present study, LA production at acidic conditions was investigated using source-sorted organic household waste (SSOHW). Controlling the pH at low value (i.e. 5.0) and bio-augmenting with Pediococcus acidilactici led to a concentration of 39.3 ± 0.5 g-LA/L with a yield of 0.75 ± 0.02 g-LA/g-sugar. In contrast, secondary fermentation at higher pH level (i.e. 5.5 and 6.0) resulted in complete LA degradation. Subsequently, consecutive batch fermentations were conducted to adapt P. acidilactici to SSOHW and improve the LA production. Results showed that P. acidilactici could successively adapt in the SSOHW reaching a relative abundance above 2.8% at adaptation process. The added P. acidilactici ensured a high concentration of LA at three consecutive generations, achieving an increment above 18% compared to control test (abiotic augmentation). Moreover, adaptation processes (i.e. maintaining pH at 4.0 or stepwise decreasing the pH from 5.0 to 4.0) significantly improved LA concentration and productivity at the pH of 4.0. Overall, the results provide a promising method to reduce the LA production costs using residual resources.

OriginalsprogEngelsk
Artikelnummer152129
TidsskriftScience of the total Environment
Vol/bind808
ISSN0048-9697
DOI
StatusUdgivet - feb. 2022

Bibliografisk note

Funding Information:
Zengshuai Zhang would like to thank financial support from the China Scholarship Council , China (CSC). The authors would like to thank the help from technician Hector Hernan Caro Garcia.

Funding Information:
Zengshuai Zhang would like to thank financial support from the China Scholarship Council, China (CSC). The authors would like to thank the help from technician Hector Hernan Caro Garcia.

Publisher Copyright:
© 2021 The Authors

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