Dry Fermentation of Agricultural Substrates

Kaiser, Franziska; Aschmann, Vera; Effenberger, Mathias; Gronauer, Andreas

doi:10.13031/2013.15267

Cited by 3 publications

(2 citation statements)

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“…To avoid failure of a fermenter, the total concentration of volatile fatty acids should be lower than 4 g L −1 . The acetic acid concentration should be lower than 3 g L −1 , the isobutyric acid concentration lower than 0.5 g L ‐1 , and the propionic acid concentration lower than 1 g L −1 but a concentration of propionic acid higher than 0.3 g L −1 is enough to disturb the anaerobic digestion .…”

Section: Resultsmentioning

confidence: 99%

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Gomes

Repke

Meyer

2019

Engineering in Life Sciences

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During leather manufacture, high amounts of chromium shavings, wet by‐products of the leather industry, are produced worldwide. They are stable towards temperatures of up to 110°C and enzymatic degradation, preventing anaerobic digestion in a biogas plant. Hitherto, chromium shavings are not utilized industrially to produce biogas. In order to ease enzymatic degradation, necessary to produce biogas, a previous denaturation of the native structure has to be carried out. In our projects, chromium shavings were pre‐treated thermally and mechanically by extrusion and hydrothermal methods. In previous works, we intensively studied the use of these shavings to produce biogas in batch scale and significant improvement was reached when using pre‐treated shavings. In this work, a scale‐up of the process was performed in a continuous reactor using pre‐treated and untreated chromium shavings to examine the feasibility of the considered method. Measuring different parameters along the anaerobic digestion, namely organic matter, collagen content, and volatile fatty acids content, it was possible to show that a higher methane production can be reached and a higher loading rate can be used when feeding the reactor with pre‐treated shavings instead of untreated chromium shavings, which means a more economical and efficient process in an industrial scenario.

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Section: Resultsmentioning

confidence: 99%

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Gomes

Repke

Meyer

2019

Engineering in Life Sciences

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“…Feedstock characteristics ( Table S1 ) make obvious that SBS contains easily degradable components like alcohol, carboxylic acid and sugar, which leads to intensive formation of organic acid that causes low pH values (Böttcher et al ., 2011 ). Furthermore, mono-fermentation of SBS requires larger volume of reactors or reduction of OLR and causes foam evolution (Kaiser et al ., 2008 ; Böttcher et al ., 2011 ).…”

Section: Methodsmentioning

confidence: 99%

Functionally redundant but dissimilar microbial communities within biogas reactors treating maize silage in co‐fermentation with sugar beet silage

Langer

Ahmed

Einfalt

et al. 2015

Microbial Biotechnology

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Numerous observations indicate a high flexibility of microbial communities in different biogas reactors during anaerobic digestion. Here, we describe the functional redundancy and structural changes of involved microbial communities in four lab-scale continuously stirred tank reactors (CSTRs, 39°C, 12 L volume) supplied with different mixtures of maize silage (MS) and sugar beet silage (SBS) over 80 days. Continuously stirred tank reactors were fed with mixtures of MS and SBS in volatile solid ratios of 1:0 (Continuous Fermenter (CF) 1), 6:1 (CF2), 3:1 (CF3), 1:3 (CF4) with equal organic loading rates (OLR 1.25 kgVS m−3 d−1) and showed similar biogas production rates in all reactors. The compositions of bacterial and archaeal communities were analysed by 454 amplicon sequencing approach based on 16S rRNA genes. Both bacterial and archaeal communities shifted with increasing amounts of SBS. Especially pronounced were changes in the archaeal composition towards Methanosarcina with increasing proportion of SBS, while Methanosaeta declined simultaneously. Compositional shifts within the microbial communities did not influence the respective biogas production rates indicating that these communities adapted to environmental conditions induced by different feedstock mixtures. The diverse microbial communities optimized their metabolism in a way that ensured efficient biogas production.

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The Influence of Leachate Refluence on Dry Mesophilic Co-Fermentation

Yin

Hou

et al. 2013

AMM

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The main objectives of this research were to determine the effect of leachate refluence on biogas production for dry mesophilic co-fermentation of chicken manure and corn straw. The biogas production, the ratio of biogas production, methane content and pH were analyzed. The results showed that the leachate refluence has a significant impact on biogas production of dry co-fermentation. The cumulative biogas yield of the once in 48h has an increase by 10% and 5% for no reflux and once in 24h, respectively. The leachate refluence has little influence on the methane content, but it has good effect to keep pH in the optimum rang.

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Dry Fermentation of Agricultural Substrates

Cited by 3 publications

References 0 publications

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Functionally redundant but dissimilar microbial communities within biogas reactors treating maize silage in co‐fermentation with sugar beet silage

The Influence of Leachate Refluence on Dry Mesophilic Co-Fermentation

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