Performance of Biogas Production by Anaerobic Digestion of Primary Sludge and Waste Activated Sludge
This study investigated the effects of hydrothermal pretreatment on the physicochemical properties,as well as an-aerobic digestion performance of primary and waste activated sludge.The results showed that the organic matter in both types of sludge consisted mainly of sugars,proteins,and lipids.The lipid content was higher in primary sludge,while the sugar and protein contents were higher in excess sludge.The anaerobic digestion gas production rates of primary and excess sludge before and after hydrothermal pretreatment were 365 and 376 L·kg-1TS,and 102 and 273 L·kg-1TS,respective-ly.The effect of hydrothermal pretreatment on primary sludge was not significant,while the anaerobic digestion performance of excess sludge was significantly improved,with a volatile solids removal rate increasing from 29％to 49％.The mixed sludge also showed an increase in volatile solids removal rate from 33％to 48％after hydrothermal pretreatment.There-fore,hydrothermal pretreatment can significantly enhance the anaerobic digestion performance of sludge,but appropriate hydrothermal pretreatment processes should be selected based on the characteristics of different types of sludge.
万方数据
维普
