Enhanced anaerobic digestion and sludge dewaterability by alkaline pretreatment and its mechanism

查看全文 作　　者：Liming [1]Shao;Xiaoyi [1]Wang;Huacheng [1]Xu;Pinjing [1]He

机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongdi University,Shanghai 200092,China

出　　处：《Journal of Environmental Sciences》索引2012年第24卷第10期,共8页

基　　金：supported by the National Natural Science Foundation of China (No. 20977066);the Program of Shanghai Subject Chief Scientist (No. 10XD1404200) 摘　　要：To investigate the influences of alkaline pretreatment on anaerobic digestion(AD) and sludge dewaterability after AD,waste activated sludge was adjusted to different pH values(8,9,10,11,12) and placed at ambient temperature for 24 hr.The samples were then adjusted to the initial pH and subjected to 25 days of AD.The results showed that,when compared with the control(pH 6.8),total suspended solids(TSS) and volatile suspended solids(VSS) reduction following pretreatment at pH 9-11 increased by 10.7%-13.1% and 6.5%-12.8%,respectively,while biogas production improved by 7.2%-15.4%.Additionally,significant enhancement of sludge dewaterability after AD occurred when pretreatment at pH 8-9 was conducted.The proteins and carbohydrates transferred from the pellet and tightly bound extracellular polymeric substances(TB-EPS) fractions to the slime and loosely bound EPS(LB-EPS) fractions after pretreatment and during the AD process,and the concentrations of proteins and carbohydrates in the slime fraction had a good linear relationship with the normalized capillary suction time(CST).During the AD process,the normalized CST was positively correlated with the organic materials in the loosely bound fraction of the sludge matrix(R 2 0.700,p < 0.01),while it was negatively correlated with the organic materials in the tightly bound fraction(R 2 0.702,p < 0.01).These results suggest that alkaline pretreatment could break the EPS matrix and release inner organic materials,thus influencing the efficiency of the AD process and dewaterability after AD. 关键词：厌氧消化污泥碱性预处理脱水性能碳水化合物机理有机材料悬浮固体每股收益

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Enhanced anaerobic digestion and sludge dewaterability by alkaline pretreatment and its mechanism

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