Mixing effect on bio-methanation, settleability and dewaterability in the anaerobic digestion of sewage sludge fractions

Authors : Dilek ERDİRENÇELEBİ, Recep YİĞİT

Pages : 242-247

Doi:10.35208/ert.1243907

View : 25 | Download : 28

Publication Date : 2023-09-30

Article Type : Research Paper

Abstract :Biomethanation and dewaterability characteristics of primary sludge insert ignore into journalissuearticles values(PS);, secondary sludge insert ignore into journalissuearticles values(SS); and mixed sludge insert ignore into journalissuearticles values(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 digestion. Continuous mixing resulted in 50% increase in the methane yield insert ignore into journalissuearticles values(600insert ignore into journalissuearticles values(+/-100); mL/g VSadd.d. SS digestion produced a comparable methane yield at 650insert ignore into journalissuearticles values(+/-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 and dewaterability characteristics where intermittent mixing enhanced settling ability while continuous mixing resulted in higher dewaterability of the stabilized sludges. Polyelectrolyte insert ignore into journalissuearticles values(PE); addition showed a negative effect on the settleability of the sludges. Low degree mixing resulted in 50% sludge volume reduction and an SVI of 64 mL/g VS compared to 25% volume reduction and 82 mL/g SVI in the continuous mixing mode for the stabilized PS. A similar trend for the stabilized SS but weaker values with 25% volume reduction and an SVI 182 mL/g in the intermittent mixing mode compared to 15% volume reduction and 200 mL/g VS SVI indicated a much lower settleability in the continuous mixing mode and compared to stabilized PS.
Keywords : Anaerobic digestion, biosolids, dewaterability, mixing, settleability, sewage sludge