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<p>The research interest about the volatile fatty acid (VFA) formation from food or kitchen waste are significantly increasing from the last few years. Assisting the ongoing tendency, in this work, kitchen waste as low-cost carbon source was treated by acidogenic fermentation with sewage sludge digestate as inoculum for VFA production. Due to the remarkable amount of kitchen waste generated annually, investigations were made at high organic loads that simulate favourable practical needs due to the higher volumetric efficiency. Information was obtained about the pH related VFA profiles, unpretreated sludge addition, batch and fed-batch operation. Without pH control, the low pH conditions (under pH 5.5) led mostly to acetic (60.2%), isobutyric (21.7%) and propionic acids (16.8%). Relatively high VFA yield (0.31&#xa0;g TVFA g-1 VS) with the domination of n-butyric acid was reached by daily pH elevation to 6.0 in the fourth day. Unpretreated inoculum addition showed higher hexanoic acid production (0.055&#xa0;g g<sup>− 1</sup> VS). In the case of fed-batch operations, VFA content and yield could be increased. Based on the results, further research directions were identified, and the potential of kitchen waste as a cheap feedstock for VFA production through acidogenic fermentation, even at elevated organic loads, was demonstrated.</p>

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Carboxylic Acid Production from Kitchen Waste and Sewage Sludge Digestate Inoculation via Acidogenic Fermentation at High Organic Load

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月18日

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  • Tamás Rózsenberszki,
  • Veronika Kalauz-Simon,
  • Róbert Fejes,
  • Péter Bakonyi,
  • László Koók,
  • Róbert Kurdi,
  • Nándor Nemestóthy,
  • Katalin Bélafi-Bakó

摘要

The research interest about the volatile fatty acid (VFA) formation from food or kitchen waste are significantly increasing from the last few years. Assisting the ongoing tendency, in this work, kitchen waste as low-cost carbon source was treated by acidogenic fermentation with sewage sludge digestate as inoculum for VFA production. Due to the remarkable amount of kitchen waste generated annually, investigations were made at high organic loads that simulate favourable practical needs due to the higher volumetric efficiency. Information was obtained about the pH related VFA profiles, unpretreated sludge addition, batch and fed-batch operation. Without pH control, the low pH conditions (under pH 5.5) led mostly to acetic (60.2%), isobutyric (21.7%) and propionic acids (16.8%). Relatively high VFA yield (0.31 g TVFA g-1 VS) with the domination of n-butyric acid was reached by daily pH elevation to 6.0 in the fourth day. Unpretreated inoculum addition showed higher hexanoic acid production (0.055 g g− 1 VS). In the case of fed-batch operations, VFA content and yield could be increased. Based on the results, further research directions were identified, and the potential of kitchen waste as a cheap feedstock for VFA production through acidogenic fermentation, even at elevated organic loads, was demonstrated.