Abstract
In this study pre-treatment of pulp and paper mill sludge was investigated to enhance the energy recovery by anaerobic digestion. Two approaches were followed using hydrolytic enzymes or microbiological treatment at 30 °C. In the first attempt, anaerobic digestion of the whole sludge, no significant improvement of the methane production potential was found. In the second test series only the liquid phase after pre-treatment and solids separation was anaerobically degraded. This option provided up to ten times increased methane production compared to the untreated sample. Sludge mass reduction between 6 and 13 % was achieved after pre-treatment. Moreover this concept can be easily integrated in the established wastewater treatment scheme utilizing an existing upflow anaerobic sludge blanket reactor.
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The authors are thankful to Petrofer Industrial Oils and Chemicals Company for providing the enzyme products and also to Markus Pruckner on site of IFATulln for his support during the analysis.
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Stoyanova, E., Bochmann, G., Couperus, A. et al. Enhanced Separation of the Organic Fraction from Paper Mill Effluent for Energy Recovery. Waste Biomass Valor 7, 1031–1039 (2016). https://doi.org/10.1007/s12649-016-9507-3
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DOI: https://doi.org/10.1007/s12649-016-9507-3