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The DOI matches its Crossref record; 129 of the 129 references it cites were found in a registry or an index.

RETRACTED ARTICLE: Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review

Open access
Wainaina, Steven, Lukitawesa, Kumar Awasthi, Mukesh, Taherzadeh, Mohammad J.·2019·Bioengineered

Abstract

Anaerobic digestion (AD) is a well-established technology used for producing biogas or biomethane alongside the slurry used as biofertilizer. However, using a variety of wastes and residuals as substrate and mixed cultures in the bioreactor makes AD as one of the most complicated biochemical processes employing hydrolytic, acidogenic, hydrogen-producing, acetate-forming bacteria as well as acetoclastic and hydrogenoclastic methanogens. Hydrogen and volatile fatty acids (VFAs) including acetic, propionic, isobutyric, butyric, isovaleric, valeric and caproic acid and other carboxylic acids such as succinic and lactic acids are formed as intermediate products. As these acids are important precursors for various industries as mixed or purified chemicals, the AD process can be bioengineered to produce VFAs alongside hydrogen and therefore biogas plants can become biorefineries. The current review paper provides the theory and means to produce and accumulate VFAs and hydrogen, inhibit their conversion to methane and to extract them as the final products. The effects of pretreatment, pH, temperature, hydraulic retention time (HRT), organic loading rate (OLR), chemical methane inhibitions, and heat shocking of the inoculum on VFAs accumulation, hydrogen production, VFAs composition, and the microbial community were discussed. Furthermore, this paper highlights the possible techniques for recovery of VFAs from the fermentation media in order to minimize product inhibition as well as to supply the carboxylates for downstream procedures.

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Crossref · 10.1080/21655979.2019.1673937This paper is marked retracted.

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Metadata

Authors
Wainaina, S., Lukitawesa, Kumar Awasthi, M., & Taherzadeh, M. J.
Venue
Bioengineered
Published
2019-01
Volume
10
Issue
1
Pages
437-458
ISSN
  • 2165-5979 (ISSN-L)
  • 2165-5987
OpenAlex
W2979252516
Cited by
555
References
129
FWCI
42.89
Type
journal article
Language
en
Status
Retracted
Open access
gold

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CoChat. (2026). Citation check: RETRACTED ARTICLE: Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review. https://app.cochat.ai/papers/10.1080/21655979.2019.1673937
The paper
Wainaina, S., Lukitawesa, Kumar Awasthi, M., & Taherzadeh, M. J. (2019). RETRACTED ARTICLE: Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review. Bioengineered. https://doi.org/10.1080/21655979.2019.1673937

Data sources

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.