NDLI: Plug-flow hydrolysis with lignocellulosic residues: effect of hydraulic retention time and thin-sludge recirculation

Content Provider	Springer Nature : BioMed Central
Author	Menzel, Theresa Neubauer, Peter Junne, Stefan
Abstract	Background Two parallel plug-flow reactors were successfully applied as a hydrolysis stage for the anaerobic pre-digestion of maize silage and recalcitrant bedding straw (30% and 66% w/w) under variations of the hydraulic retention time (HRT) and thin-sludge recirculation. Results The study proved that the hydrolysis rate profits from shorter HRTs while the hydrolysis yield remained similar and was limited by a low pH-value with values of 264–310 and 180–200 gO2 kgVS−1 for 30% and 66% of bedding straw correspondingly. Longer HRT led to metabolite accumulation, significantly increased gas production, a higher acid production rate and a 10–18% higher acid yield of 78 gSCCA kgVS−1 for 66% of straw. Thin-sludge recirculation increased the acid yield and stabilized the process, especially at a short HRT. Hydrolysis efficiency can thus be improved by shorter HRT, whereas the acidogenic process performance is increased by longer HRT and thin-sludge recirculation. Two main fermentation patterns of the acidogenic community were found: above a pH-value of 3.8, butyric and acetic acid were the main products, while below a pH-value of 3.5, lactic, acetic and succinic acid were mainly accumulating. During plug-flow digestion with recirculation, at low pH-values, butyric acid remained high compared to all other acids. Both fermentation patterns had virtually equal yields of hydrolysis and acidogenesis and showed good reproducibility among the parallel reactor operation. Conclusions The suitable combination of HRT and thin-sludge recirculation proved to be useful in a plug-flow hydrolysis as primary stage in biorefinery systems with the benefits of a wider feedstock spectrum including feedstock with cellulolytic components at an increased process robustness against changes in the feedstock composition. Graphical Abstract
Related Links	https://biotechnologyforbiofuels.biomedcentral.com/counter/pdf/10.1186/s13068-023-02363-7.pdf
Ending Page	17
Page Count	17
Starting Page	1
File Format	HTM / HTML
ISSN	27313654
DOI	10.1186/s13068-023-02363-7
Journal	Biotechnology for Biofuels and Bioproducts
Issue Number	1
Volume Number	16
Language	English
Publisher	BioMed Central
Publisher Date	2023-07-06
Access Restriction	Open
Subject Keyword	Biotechnology Plant Breeding Environmental Engineering Renewable and Green Energy Microbiology Microbial hydrolysis Plug-flow reactor Anaerobic digestion Recirculation Hydraulic retention time Plant Breeding/Biotechnology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Energy Management, Monitoring, Policy and Law Renewable Energy, Sustainability and the Environment Applied Microbiology and Biotechnology Biotechnology
Journal Impact Factor	6.1/2023
5-Year Journal Impact Factor	6/2023

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