Journal
WATER AND ENVIRONMENT JOURNAL
Volume 30, Issue 3-4, Pages 203-210Publisher
WILEY
DOI: 10.1111/wej.12188
Keywords
anaerobic digestion; energetic potential capture; PS: WAS ratio; sludge management practices
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This work aimed the study of methane yield using different proportions of primary sludge (PS) and waste activated sludge (WAS) for anaerobic digestion (AD) conversion. Three trials were carried out: T1 (60 : 40, v/v), T2 (80 : 20, v/v) and T3 (100 : 00, v/v) to estimate the best proportion in comparison with a reference scenario, T0 (40 : 60, v/v). AD was performed in mesophilic conditions with a hydraulic retention time (HRT) of 15 days and an organic loading rate (OLR) expressed in total volatile solids (TVS) of 1.62 +/- 0.06 kg(TVS) m(-3) day(-1). Biogas production for trials T1 and T2 increased from 45 to 71% in comparison with T0. The experimental methane production along trials was used to assess the energy recovery corresponding to increases from 32 to 55%. The most suitable trial to be implemented at real-scale is T1, applying a lower PS solid retention time combined with an increase of WAS thickening.
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