Effect of ultrasonic pretreatment on anaerobic digestion and its sludge dewaterability

查看全文 作　　者：Huacheng Xu Pinjing He Guanghui Yu Liming [1]Shao

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

出　　处：《Journal of Environmental Sciences》索引2011年第23卷第9期,共7页

基　　金：supported by the National Key Project for Water Pollution Control (No.2008ZX07316-003);the Program of Shanghai Subject Chief Scientist (No.10XD1404200) 摘　　要：To investigate the effect of ultrasonic pretreatment on anaerobic digestion and sludge dewaterability and further to probe into the influencing factors on sludge dewaterability,sludge flocs were stratified into four fractions: (1) slime;(2) loosely bound extracellular polymeric substances (LB-EPS);(3) tightly bound EPS (TB-EPS);and (4) EPS-free pellets.The results showed that ultrasonic pretreatment increased the anaerobic digestion efficiency by 7%–8%.Anaerobic digestion without ultrasonic pretreatment deteriorated the sludge dewaterability,with the capillary suction time (CST) increased from 1.42 to 47.3 (sec·L)/g-TSS.The application of ultrasonic pretreatment firstly deteriorated the sludge dewaterability (normalized CST increased to 44.4 (sec·L)/g-TSS),while subsequent anaerobic digestion offset this effect and ultimately decreased the normalized CST to 23.2 (sec·L)/g-TSS.The dewaterability of unsonicated sludge correlated with protein (p = 0.003) and polysaccharide (p = 0.004) concentrations in the slime fraction,while that of sonicated sludge correlated with protein concentrations in the slime and LB-EPS fractions (p < 0.05).Fluorescent excitationemission matrix analysis showed that the fluorescence matters in the LB-EPS fraction significantly correlated with sludge dewaterability during anarobic digestion. 关键词：超声波预处理污泥脱水脱水性能厌氧消化性能恶化相关蛋白 EPS 超声波处理

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Effect of ultrasonic pretreatment on anaerobic digestion and its sludge dewaterability

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