engleski

Composting of Vinasse and Grape Marc Solid Waste

In this work composting of binary mixtures of vinasse and grape marc at airflow rate of 0.5 Lmin-1kgVS-1 was carried out in closed thermally insulated column reactor (6.0 L). During the process, which lasted 14 days, air temperatures at the reactor's inlet and at three levels of composting mass (bottom, middle and top) were closely monitored. The biodegradation rate of the organic fraction of the substrate, moisture content and pH-value were recorded every day. Because of the low pH-value the substrate was neutralized with NaHCO3, w(NaHCO3) = 2 %. During the composting process the highest temperature was 46°C, pH-value varied between 7.5 and 8.3 and moisture content in composting mass was between 59.1 and 68.7 %. Biodegradation rate of organic fraction in solid waste was simulated using the empirical model. It was found out that the selected model describes aerobic composting fairly well and confirms the hypothesis that the released heat is proportional to the biodegradation process.

composting; vinasse; grape marc; closed column reactor

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