Combination of Ultrasound Thermal Pretreatment for Sludge Solubilization and Enhanced Anaerobic Digestion

摘要

To enhance the anaerobic digestion pretreatment of waste activated sludge was donecombining three different ultrasound specific energy inputs (1000, 5,000, and 10,000 kJ kg-1 TS-1) and thermal pretreatment temperatures (50, 70 and 90oc). Prior to anaerobic digestion,combined pretreatments have significantly released extracellular polymeric substance (EPS)through sludge solubilisation. A maximum 46% increase in specific methane production (mlCH4/gm VSS added) was observed for sono-thermal combined pretreatment combining 10,000 kJkg-1 TS-1 specific energy input and 30 minutes thermal pretreatment at 90oc.