Decentralized biogas produced through co-digestion of biomass can play an important role in our future renewable energy mix. However the optimal design, planning and use of a biogas production chain is a daunting process. When looking into a biogas production chain one must take into account, first, the biomass availability in quantity, quality and the location, second, the energy demand in energy type, quantity and location and finally the needed machinery and infrastructure to connect them. During this process there are social, legal and environmental issues to overcome, but overall the financial aspects will mostly dictate viability. Hence, the complexity involved in linking the aforementioned aspects is difficult at most.
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Met dit opdrachtenboek wordt een brug geslagen tussen het onderwijs en externe bedrijven met onderzoeksvragen. In deze tweede versie van het Innovatiewerkplaats-opdrachtenboek in het kader van het Innovatiewerkplaats/Krachtig MKB van het Kenniscentrum Biobased Economy (KC BBE) en het Instituut voor Life Sciences & Technology (ILST) vindt u ILST-gerelateerde opdrachten voor de ILST-(honours)student of docent-onderzoeker. Deze opdrachten zijn geacquireerd in samenwerking met de Gebiedscoöperatie Westerkwartier en de Gebiedscoöperatie Oost-Groningen (i.o.); ‘opgehaald’ tijdens het door het KC BBE georganiseerde grassymposium en als kennisvraag ontstaan door eerdere verrichte onderzoeken vanuit het Innovatiewerkplaats-gebeuren.
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This study evaluated the performance of anaerobic co-digestion of cow manure (CM) and sheep manure (SM) in both batch and continuous digesters at 37 °C. Synergistic effects of co-digesting CM and SM at varying volatile solids (VS) ratios (1:0, 0:1, 3:1, 1:1, 1:3) were observed in the batch experiment, with the most effective degradation of cellulose (56%) and hemicellulose (55%), and thus, the highest cumulative methane yield (210 mL/gVSadded) obtained at a CM:SM ratio of 1:3. Co-digesting CM and SM improved the hydrolysis, as evidenced by the cellulase brought by SM and the increases of cellulolytic bacteria Clostridium. Besides, co-digestion enhanced the acidogenesis and methanogenesis, reflected by the enrichment of syntrophic bacteria Candidatus Cloacimonas and hydrogenotrophic archaea Methanoculleus (Coenzyme-B sulfoethylthiotransferase). When testing continuous digestion, the methane yield increased from 146 mL/gVS/d (CM alone) to 179 mL/gVS/d (CM:SM at 1:1) at a constant organic loading rate (OLR) of 1g VS/L/d and a hydraulic retention time (HRT) of 25 days. Furthermore, the anaerobic digestion process was enhanced when the daily feed changed back to CM alone, reflected by the improved daily methane yield (159 mL/VS/d). These results provided insights into the improvement of methane production during the anaerobic digestion of animal manure.
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