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Wahlstedt, Germany

Feher A.,HAWK University of Applied Sciences and Arts | Loewen A.,HAWK University of Applied Sciences and Arts | Fritz T.,ISF GmbH | Nelles M.,University of Rostock | Nelles M.,DBFZ German Biomass Research Center
IYCE 2015 - Proceedings: 2015 5th International Youth Conference on Energy | Year: 2015

The significance of the method of sequential extraction for the evaluation of the bioavailability of trace elements in biogas formation process was investigated by supplementation tests (batch tests and semi-continuous tests). According to their bioavailability, eleven nickel compounds were arranged in an order. The shift of nickel concentrations between the fractions while increasing the gas production rate determined by sequential extraction represents assumedly the adsorption process on the cell membrane. We found that the bioavailability of the trace elements in the successively extracted fraction does not decrease continuously, but it has to be evaluated element and time specific. Fermentation substrates used for the experiments were generated in test reactors by depleting only one trace element. Simultaneously the correlation between trace element supply, organic loading rate and trace element concentration was quantified. Furthermore storage stability of the samples, as well as the impact of extraction duration and temperature was examined. © 2015 IEEE. Source


A method for producing amino acid chelate compounds, characterized in that metal oxides and/or metal carbonates and/or metal sulfates and/or metal chlorides and/or metal hydroxides in solid form are activated mechanically and then the activated metal oxides and/or metal carbonates and/or metal hydroxides and/or metal sulfates and/or metal chlorides are brought together with amino acids in solid form and converted to amino acid chelate compounds in a solid-state reaction.


Haag N.L.,University of Hohenheim | Nagele H.-J.,University of Hohenheim | Fritz T.,ISF GmbH | Oechsner H.,University of Hohenheim
Bioresource Technology | Year: 2015

A green biorefinery enables the material and energetic use of biomass via lactic acid and methane production. Different ensiling techniques were applied to maize and amaranth with the aim to increase the amount of lactic acid in the silage. In addition the methane formation potential of the ensiled samples and the remaining solid residues after separating the organic juice were assessed. Treating maize with homofermentative lactic acid bacteria in combination with carbonated lime increased the amount of lactic acid about 91.9%. For amaranth no additional lactic acid production was obtained by treating the raw material. Specific methane yields for the solid residues of amaranth were significantly lower in comparison to the corresponding silages. The most promising treatment resulted in a production of 127.9±4.1gkg-1 DM lactic acid and a specific methane yield for the solid residue of 349.5±6.6lNkg-1 ODM. © 2014 Elsevier Ltd. Source


Haag N.L.,University of Hohenheim | Steinbrenner J.,University of Hohenheim | Demmig C.,ISF GmbH | Nagele H.-J.,University of Hohenheim | Oechsner H.,University of Hohenheim
Industrial Crops and Products | Year: 2016

Immense research has been performed on influencing silage characteristics by use of biological and chemical additives. For new applications, such as the non-food material use of silage ingredients (e.g. lactic acid) in biorefineries, new ensiling techniques and additives are required. To investigate the influence of manganese supplementation on lactic acid production in maize silage, different concentrations of MnSO4 (0.001 g kg-1 & 0.003 g kg-1) and contrast treatments (homofermentative lactic acid bacteria (LAB) mixture & carbonated lime in various combinations) were applied to the raw material maize. Manganese addition had no effect (r=0.047) on the lactic acid content in the silage. In fact the addition of carbonated lime (13.81gkg-1) increased the lactic acid amount by 169.4% up to 167.3±3.1 g kg-1 DM (dry matter). As well the addition of the homofermentative LAB mixture slightly increased the amount of lactic acid in the silage by 12.6%. © 2015 Elsevier B.V. Source


Vintiloiu A.,University of Hohenheim | Boxriker M.,University of Hohenheim | Lemmer A.,University of Hohenheim | Oechsner H.,University of Hohenheim | And 3 more authors.
Chemical Engineering Journal | Year: 2013

The uptake of essential trace elements by methanogenic bacteria can be obstructed by precipitation in the presence of sulfides and carbonates. The objective of this study was to investigate whether the bioavailability of trace elements, and therefore the methane yield, can be improved through the use of complexing agents. Research showed that the use of EDTA as a complexing agent in the biogas process increases the solubility of essential metals and enhances their bioavailability. If the substrate of a biogas digester has a low content of trace elements, solutions of elements essential for the methanogenic bacteria have to be added to the process. If these metals are complexed with EDTA prior to their supply, the necessary amount can be reduced by up to 75% compared to the non-complexed metals. Therefore, it would be advantageous for environmental and economic reasons to complex trace elements prior to their addition to the biogas process. © 2013 Elsevier B.V. Source

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