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Dynamic variation of the microbial community structure during the long-time mono-fermentation of maize and sugar beet silage.

Klang J, Theuerl S, Szewzyk U, Huth M, Tölle R, Klocke M - Microb Biotechnol (2015)

Bottom Line: Based on the high amount of complex compounds, the anaerobic conversion rate of maize silage was slightly lower compared with the sugar beet silage.It was further shown that species of the genus Methanosaeta are highly sensitive against sudden stress situations such as a strong decrease in the ammonium nitrogen (NH₄(+)-N) concentration or a drop of the pH value.However, the overall biomass conversion of both feedstocks proceeded efficiently as a steady state between acid production and consumption was recorded, which further resulted in an equal biogas yield.

View Article: PubMed Central - PubMed

Affiliation: Department Bioengineering, Leibniz Institute for Agricultural Engineering, Max Eyth Allee 100, Potsdam, 14469, Germany.

No MeSH data available.


Total Kjeldahl nitrogen (TKN) and ammonium nitrogen (NH4+-N) concentration of the maize reactor digestate as well as the sugar beet reactor digestate over the entire experimental time as mean values including standard deviation of the three parallel reactors per feedstock.
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fig02: Total Kjeldahl nitrogen (TKN) and ammonium nitrogen (NH4+-N) concentration of the maize reactor digestate as well as the sugar beet reactor digestate over the entire experimental time as mean values including standard deviation of the three parallel reactors per feedstock.

Mentions: The total Kjeldahl nitrogen (TKN) was rather constant in the maize reactors, but decreased in the sugar beet reactors until around day 141. These findings indicate that the sugar beet reactors required more time to reach stationary conditions caused by the generally lower TKN in the sugar beet silage (Fig. 2). On the other hand, the NH4+-N concentration constantly decreased in both reactor systems (Fig. 2). Considering that no TKN was accumulated, this indicates that only low protein degradation took place. It can be assumed that the present microorganisms utilized the more easy accessible carbon compounds as primary energy source whereby the proteins were only degraded into amino acids, which were used for their cell growth but not mineralized to ammonium nitrogen. Several studies confirmed that the protein degradation capacity decreased when high amounts of sugar are present (Breure et al., 1986; Tommaso et al., 2003). This seems to be the case especially in the sugar beet reactors.


Dynamic variation of the microbial community structure during the long-time mono-fermentation of maize and sugar beet silage.

Klang J, Theuerl S, Szewzyk U, Huth M, Tölle R, Klocke M - Microb Biotechnol (2015)

Total Kjeldahl nitrogen (TKN) and ammonium nitrogen (NH4+-N) concentration of the maize reactor digestate as well as the sugar beet reactor digestate over the entire experimental time as mean values including standard deviation of the three parallel reactors per feedstock.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4554465&req=5

fig02: Total Kjeldahl nitrogen (TKN) and ammonium nitrogen (NH4+-N) concentration of the maize reactor digestate as well as the sugar beet reactor digestate over the entire experimental time as mean values including standard deviation of the three parallel reactors per feedstock.
Mentions: The total Kjeldahl nitrogen (TKN) was rather constant in the maize reactors, but decreased in the sugar beet reactors until around day 141. These findings indicate that the sugar beet reactors required more time to reach stationary conditions caused by the generally lower TKN in the sugar beet silage (Fig. 2). On the other hand, the NH4+-N concentration constantly decreased in both reactor systems (Fig. 2). Considering that no TKN was accumulated, this indicates that only low protein degradation took place. It can be assumed that the present microorganisms utilized the more easy accessible carbon compounds as primary energy source whereby the proteins were only degraded into amino acids, which were used for their cell growth but not mineralized to ammonium nitrogen. Several studies confirmed that the protein degradation capacity decreased when high amounts of sugar are present (Breure et al., 1986; Tommaso et al., 2003). This seems to be the case especially in the sugar beet reactors.

Bottom Line: Based on the high amount of complex compounds, the anaerobic conversion rate of maize silage was slightly lower compared with the sugar beet silage.It was further shown that species of the genus Methanosaeta are highly sensitive against sudden stress situations such as a strong decrease in the ammonium nitrogen (NH₄(+)-N) concentration or a drop of the pH value.However, the overall biomass conversion of both feedstocks proceeded efficiently as a steady state between acid production and consumption was recorded, which further resulted in an equal biogas yield.

View Article: PubMed Central - PubMed

Affiliation: Department Bioengineering, Leibniz Institute for Agricultural Engineering, Max Eyth Allee 100, Potsdam, 14469, Germany.

No MeSH data available.