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Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste Cover

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Open Access
|Jul 2018

Abstract

The aim of this study was to investigate the effect of pH on the dark fermentation process of kitchen waste by specifying the composition of the volatile fatty acids (VFA), H2 and by drawing the carbon balance. Studies were carried out in 8 dm3 batch bioreactor in mesophilic conditions. The kitchen waste from the city of Lodz were used as a substrate. Based on the study, it was observed that most of the VFA was produced during the first two days of the process, while in the following days the production was diminished. The highest production of VFA (19.5 g/dm3) was obtained in the bioreactor, where the pH was 7 and 8. Analyzing the produced VFA it was observed that mostly the acetic and butyric acid had been produced. Most of acetic acid (over 70 %) was obtained in fermenter with pH 7 and 8. In contrast, most of the butyric acid (over 40 %) was in the bioreactor with a pH of 6. Production of H2 was in the range from 4.29 to 26.5 dm3, wherein the largest amount of H2 was created in the bioreactor with a pH of 6.

DOI: https://doi.org/10.1515/eces-2018-0020 | Journal eISSN: 2084-4549 | Journal ISSN: 1898-6196
Language: English
Page range: 295 - 306
Published on: Jul 17, 2018
Published by: Society of Ecological Chemistry and Engineering
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2018 Justyna Grzelak, Radosław Ślęzak, Liliana Krzystek, Stanisław Ledakowicz, published by Society of Ecological Chemistry and Engineering
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.