Mixing Effect on Bio-Methanation, Settleability and Dewaterability in the Anaerobic Digestion of Sewage Sludge Fractions

Biomethanation and dewaterability characteristics of primary (PS), secondary sludge (SS) and mixed sludge (MS) fractions were assessed after anaerobic stabilization under parallel batch and continuous mixing conditions at 35℃ in order to investigate the performance of the separate digestion system. Similar methane conversion/yield values were obtained in PS, SS and MS digestion with continuous mixing’s positive effect only in PS digestionContinuous mixing resulted in 50% increase in the methane yield (600(+/-100) mL/g VSadd.d. SS sludge digestion produced a comparable methane yield at 650(+/-100) mL/g VSadd.d showing no effect due to mixing pattern. Settling and dewaterability characteristics of the stabilized PS were superior to stabilized SS samples. A reverse relationship was obtained between settling characteristics and where intermittent mixing enhanced settling ability while continuous mixing resulted in higher dewaterability of the stabilized sludges. PE addition showed a negative effect on the settleability of the sludges. Low degree mixing resulted in lower Imhoff settling volume with 50% sludge volume reduction and an SVI of 64 mL/g VS compared to 25% volume reduction and 82 mL/g SVI in the CM mode for the stabilized PS. A similar trend for the stabilized SS but worsened values with 25% volume reduction and an SVI 182 mL/g compared to 15% volume reduction and 200 mL/g VS indicated much lower settleability character in the CM mode and compared to stabilized PS.