Effects of the reduction of the hydraulic retention time to 1.5 days at constant organic loading in CSTR, ASBR, and fixed-bed reactors – performance and methanogenic community composition

Article

Schmidt, Thomas, Ziganshin, Ayrat M., Nikolausz, Marcell, Scholwin, Frank, Nelles, Michael, Kleinsteuber, Sabine and Proter, Jurgen. 2014. "Effects of the reduction of the hydraulic retention time to 1.5 days at constant organic loading in CSTR, ASBR, and fixed-bed reactors – performance and methanogenic community composition." Biomass and Bioenergy. 69, pp. 241-248. https://doi.org/10.1016/j.biombioe.2014.07.021
Article Title

Effects of the reduction of the hydraulic retention time to 1.5 days at constant organic loading in CSTR, ASBR, and fixed-bed reactors – performance and methanogenic community composition

ERA Journal ID3452
Article CategoryArticle
AuthorsSchmidt, Thomas (Author), Ziganshin, Ayrat M. (Author), Nikolausz, Marcell (Author), Scholwin, Frank (Author), Nelles, Michael (Author), Kleinsteuber, Sabine (Author) and Proter, Jurgen (Author)
Journal TitleBiomass and Bioenergy
Journal Citation69, pp. 241-248
Number of Pages8
Year2014
Place of PublicationUnited Kingdom
ISSN0961-9534
1873-2909
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biombioe.2014.07.021
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0961953414003547
Abstract

The hydraulic retention time (HRT) is one of the key parameters in biogas processes and often it is postulated that a minimum HRT of 10e25 days is obligatory in continuous stirred tank reactors (CSTR) to prevent a washout of slow growing methanogens. In this study the effects of the reduction of the HRT from 6 to 1.5 days on performance and methanogenic community composition in different systems with and without immobilization operated with simulated thin stillage (STS) at mesophilic conditions and constant organic loading rates (OLR) of 10 g L�1d�1 of volatile solids were investigated. With the reduction of the HRT process instability was first observed in the anaerobic sequencing batch reactor (ASBR) (at HRT of 3 days) followed by the CSTR (at HRT of 2 days). The fixed bed reactor (FBR) was stable until the end of the experiment, but the reduction of the HRT to 1.5 days caused a decrease of the specific biogas production to about 450 L kg�1 of VS compared to about 600 L kg�1 of VS at HRTs of 4e5 days. Methanoculleus and Methanosarcina were the dominant genera under stable process conditions in the CSTR and the ASBR and members of Methanosaeta and Methanospirillum were only present at HRT of 4 days and lower. In the effluent of the FBR Methanosarcina spp. were not detected and Methanosaeta spp. were more abundant then in the other reactors.

Keywordsbiogas; methanogenic community; reactors; retention time; washout
ANZSRC Field of Research 2020401102. Environmentally sustainable engineering
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Byline AffiliationsDBFZ German Biomass Research Centre, Germany
Kazan Federal University, Russia
Helmholtz Centre for Environmental Research, Germany
University of Rostock, Germany
Institution of OriginUniversity of Southern Queensland
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