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  • Title: Co-digestion of intermediate landfill leachate and sewage sludge as a method of leachate utilization.
    Author: Montusiewicz A, Lebiocka M.
    Journal: Bioresour Technol; 2011 Feb; 102(3):2563-71. PubMed ID: 21167708.
    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 m(3) per kg of removed volatile solids (VS), while that from a 10:1 mixture was 1.24 m(3) 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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