Reduction of the hydraulic retention time at constant high organic loading rate to reach the microbial limits of anaerobic digestion in various reactor systems

Article

Ziganshin, Ayrat M., Schmidt, Thomas, Lv, Zuopeng, Richnow, Hans Hermann, Kleinsteuber, Sabine and Nikolausz, Marcell. 2016. "Reduction of the hydraulic retention time at constant high organic loading rate to reach the microbial limits of anaerobic digestion in various reactor systems." Bioresource Technology. 217, pp. 62-71. https://doi.org/10.1016/j.biortech.2016.01.096
Article Title

Reduction of the hydraulic retention time at constant high organic loading rate to reach the microbial limits of anaerobic digestion in various reactor systems

ERA Journal ID3454
Article CategoryArticle
AuthorsZiganshin, Ayrat M. (Author), Schmidt, Thomas (Author), Lv, Zuopeng (Author), Richnow, Hans Hermann (Author), Kleinsteuber, Sabine (Author) and Nikolausz, Marcell (Author)
Journal TitleBioresource Technology
Journal Citation217, pp. 62-71
Number of Pages10
Year2016
PublisherElsevier
Place of PublicationNetherlands
ISSN0960-8524
1873-2976
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biortech.2016.01.096
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S0960852416300724
Abstract

The effects of hydraulic retention time (HRT) reduction at constant high organic loading rate on the activity of hydrogen-producing bacteria and methanogens were investigated in reactors digesting thin stillage. Stable isotope fingerprinting was additionally applied to assess methanogenic pathways. Based on hydA gene transcripts, Clostridiales was the most active hydrogen-producing order in continuous stirred tank reactor (CSTR), fixed-bed reactor (FBR) and anaerobic sequencing batch reactor (ASBR), but shorter HRT stimulated the activity of Spirochaetales. Further decreasing HRT diminished Spirochaetales activity in systems with biomass retention. Based on mcrA gene transcripts, Methanoculleus and Methanosarcina were the predominantly active in CSTR and ASBR, whereas Methanosaeta and Methanospirillum activity
was more significant in stably performing FBR. Isotope values indicated the predominance of aceticlastic pathway in FBR. Interestingly, an increased activity of Methanosaeta was observed during shortening HRT in CSTR and ASBR despite high organic acids concentrations, what was supported by stable isotope data.

Keywordsbiogas; thin stillage; Fe–Fe-hydrogenases; methanogenic activity Stable isotope fingerprinting
ANZSRC Field of Research 2020401102. Environmentally sustainable engineering
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Byline AffiliationsKazan Federal University, Russia
DBFZ German Biomass Research Centre, Germany
Helmholtz Centre for Environmental Research, Germany
Institution of OriginUniversity of Southern Queensland
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