Co-digestion of intermediate landfill leachate and sewage sludge as a method of leachate utilization |
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Authors: | Montusiewicz A Lebiocka M |
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Institution: | Lublin University of Technology, Faculty of Environmental Engineering, 20-618 Lublin, Nadbystrzycka St. 40 B, Poland |
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Abstract: | This study examines the co-digestion of intermediate landfill leachate and sewage sludge from a municipal wastewater treatment plant. Application of leachate as a co-fermentation component increased the concentrations of soluble organic compounds (expressed as total organic carbon), ammonium nitrogen, and alkalinity in the digester influents.The biogas yield obtained from the co-fermentation of a 20:1 sewage sludge: intermediate leachate mixture was 1.30 m3 per kg of removed volatile solids (VS), while that from a 10:1 mixture was 1.24 m3 per kg of removed VS. These values exceeded the biogas yield for the sludge alone by 13% and 8%, respectively. The leachate addition influenced the proportion of methane to a minor extent. Increased methane yields of 16.9% and 6.2% per kg of removed VS were found for the two sewage sluge:intermediate leachate mixtures, respectively. |
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Keywords: | Leachate utilization Intermediate landfill leachate Mixed sewage sludge Anaerobic co-digestion Enhanced biogas production |
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