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  • Biogas potential of dog rose (Rosa Canina L.) fruit extract residue [Elektronski vir]
    Osojnik Črnivec, Ilja Gasan ; Djinović, Petar ; Pintar, Albin
    High energy prices and increasing demand for energy combined with the up coming standards of the low carbon economy are the driving forces of research and development in the field of waste energy ... exploitation. There is agreat industrial appeal for the utilization of indigenous wastewaters, solid waste and cheap byproducts in the processes where these materials represent the raw material for conversion into synthetic fuels, biogas or high value chemicals. In this study, solid waste from the production of dog rose (Rosa canina L.) fruit extract was considered as a possible substrate for biogas production via anaerobic microbial degradation of organic matter. Waste obtained from the extraction process is heterogeneous and rich in ethanol. Effect of easily degradable ethanol and poorly degradable dog rose seeds was evaluated by drying (at 40°C), sieving (1,5 mm window) and grinding (1 mm cut) the samples in various combinations. As the anaerobic microbial treatment of this biodegradable material has not been reported yet, the production of biogas from waste breadcrumbs, a well known, highly biodegradable and homogeneous substrate was studied simultaneously to enable more relevant comparison of the results. Substrates were analyzed for:(i) dry matter and volatile solids (DM and VS), (ii) content of C, H, N and S, (iii) chemical oxygen demand (COD) and caloric value (~Hco). Biochemical methane potential (BMP) was determined in two separate bench top batch reactor systems (OxiTop (WTW) and AMPTS (Bioprocess Control)). Inoculum was obtained from a commercial biogas plant. The OxiTop system was started at 0,2 g CODsubsrrate/g VSinoculum load [2] of the fermentation mixture and incubated for 10 days at 37°C. The AMPTS bioreactors were started at 0,5 g OSsubstrare/g OSinoculum and incubated for 50 days at the same conditions. It was observed that all the tested samples are suitable for biogas production, As expected, the highest cumulative biogas production and the highest biomethane potential were achieved via anaerobic biodegradation of dry bread (BMP1O = 96 NlCH4/kg CODsubstrate). Amongst the dog rose samples, the sample that was both dried and sieved showed the highest biochemical methane potential (BMPIO = 50 NlCH4/kg CODsubstrate), whereas the production of biogas from the sample that was dried only did not exceed the production of the blank control during the 10 day long fermentation. Longer period of fermentation and higher loading of the bioreactors with the substrate in the AMPTS system yielded considerably higher amounts of methane and BMP values. Considering the C/N ratio of tested substrates, we conclude that reference dry bread substrate is suitable for individual biogas production. On the other hand, residual dog rose fruit C/N ratio is high, which implies that it should be fermented with nitrogen-rich co-substrates toachieve a stable performance of the biogas production process.
    Vir: Book of abstracts [Elektronski vir] (Str. 165)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 5096986

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