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Effects of salt and oil concentrations on volatile fatty acid generation in food waste fermentation

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  • Liu, Nuo
  • Wang, Quan
  • Jiang, Jianguo
  • Zhang, Haowei

Abstract

The main objective of this study was to evaluate the effects of salt and oil on volatile fatty acid (VFA) generation during anaerobic digestion. Lab-scale sequencing batch reactor experiments were operated at various salt concentrations of 3 g/L (S3), 6 g/L (S6), 9 g/L (S9), 12 g/L (S12) and oil concentrations of 5 g/L (O5), 15 g/L (O15), 25 g/L (O25), 35 g/L (O35) under previously determined optimal conditions (35 °C and pH of 6). The results revealed that VFA generation was reduced 18.7% and 89.9% at S6 and S12. Similarly, VFA generation decreased by 6% and 67.2% at O5 and O35, respectively. The salt concentration ＜ 6 g/L or the oil concentration ＜ 5 g/L minimally inhibited the VFA yield. Moreover, the VFA yield remain stable and the lag phase was shorten at salt and oil concentration at 6 g/L and 5 g/L, respectively (S6O5) compared with a single addition. The above finding indicates the possibility of VFA generation under conditions where salt and oil coexist. Thus, a salt concentration ＜ 6 g/L and/or oil concentration＜5 g/L in food waste was suitable for VFA generation in food waste fermentation.

Suggested Citation

  • Liu, Nuo & Wang, Quan & Jiang, Jianguo & Zhang, Haowei, 2017. "Effects of salt and oil concentrations on volatile fatty acid generation in food waste fermentation," Renewable Energy, Elsevier, vol. 113(C), pages 1523-1528.
    • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:1523-1528
    DOI: 10.1016/j.renene.2017.07.042
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    References listed on IDEAS

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    1. Appels, Lise & Lauwers, Joost & Degrève, Jan & Helsen, Lieve & Lievens, Bart & Willems, Kris & Van Impe, Jan & Dewil, Raf, 2011. "Anaerobic digestion in global bio-energy production: Potential and research challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(9), pages 4295-4301.
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    Cited by:

    1. Zexuan Wu & Bangyi Yin & Xu Song & Jiangping Qiu & Linkui Cao & Qi Zhao, 2019. "Effects of Salinity on Earthworms and the Product During Vermicomposting of Kitchen Wastes," IJERPH, MDPI, vol. 16(23), pages 1-12, November.
    2. He, Xiaoman & Deng, Chen & Li, Pengfei & Yu, Wenbing & Chen, Huichao & Lin, Richen & Shen, Dekui & Baroutian, Saeid, 2024. "The impact of salinity on biomethane production and microbial community in the anaerobic digestion of food waste components," Energy, Elsevier, vol. 294(C).

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