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Pobeheim, H; Munk, B; Lindorfer, H; Guebitz, GM.
(2011): Impact of nickel and cobalt on biogas production and process stability during semi-continuous anaerobic fermentation of a model substrate for maize silage.
Water Res. 2011; 45(2):781-787 FullText FullText_BOKU

Abstract:: The importance of nickel and cobalt on anaerobic degradation of a defined model substrate for maize was demonstrated. Five semi-continuous reactors were operated for 250 days at 35 degrees C and a well-defined trace metal solution was added to all reactors. Two reactors each were limited regarding the concentration of Ni(2+) and Co(2+), respectively, for certain time intervals. The required nickel concentration was depending on the organic loading rates (OLR) while, for example, above 2.6 g ODM L(-1) d(-1) nickel concentrations below 0.06 mg kg(-1) FM in the process significantly decreased biogas production by up to 25% compared to a control reactor containing 0.8 mg Ni(2+) kg(-1) FM. Similarly, limitation of cobalt to 0.02 mg kg(-1) FM decreased biogas production by about 10%. Limitations of nickel as well as cobalt lead to process instability. However, after gradual addition of nickel till 0.6 mg and cobalt till 0.05 mg kg(-1) FM the OLR was again increased to 4.3 g ODM L(-1) d(-1) while process stability was recovered and a fast metabolisation of acetic and propionic acid was detected. An increase of nickel to 0.88 mg kg(-1) FM did not enhance biogas performance. Furthermore, the increase of cobalt from 0.05 mg kg(-1) FM up to 0.07 mg kg(-1) FM did not exhibit a change in anaerobic fermentation and biogas production. (C) 2010 Elsevier Ltd. All rights reserved.
Authors BOKU Wien:: Gübitz Georg
Find related publications in this database (using NML MeSH Indexing): Anaerobiosis -; Biofuels -; Bioreactors -; Cobalt - administration & dosage; Fatty Acids, Volatile - metabolism; Fermentation - drug effects; Hydrogen-Ion Concentration -; Nickel - administration & dosage; Silage -; Zea mays - metabolism
Find related publications in this database (Keywords): Biogas; Volatile fatty acids; Cellulose; Nickel; Cobalt