Szukana fraza: [Abstract = "The sludge in the reactor was replaced once a day, with hydraulic retention time of 10 days. Grease trap waste accounted for 35%wt. of the fermentation mixture. The stabilization process was monitored everyday based on the measurements of biogas volume. Addition of yeast biopreparation to methane fermentation of sewage sludge with grease trap waste caused an increase in mean daily biogas production from 6.9 dm3\(control mixture\) to 9.21dm3\(mixture M3\). No differences in biogas production were found for other cases \(mixtures M1, M2\). A similar relationship was observed for methane content in biogas."]

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