Influence of loosely bound extracellular polymeric substances (EPS) on the biomass-effluent separation of activated sludge system
Introduction Microbial extracellular polymeric substances (EPS) are major components of the activated sludge floc matrix (Fr01und et al, 1996). Many investigations have been carried out on the role of EPS in sludge settleability (Nagaoka et al., 1996; Wilen et al, 2003). However, the results of previous studies are often inconsistent and the exact effects of EPS on sludge-water separation still need to be identified. Bacteria in the activated sludge suspension and floc matrix are likely to have a dynamic double-layered EPS structure of loosely bound EPS diffused from the tightly bound EPS that surrounds the cells (Poxon and Darby, 1997). However, most previous experimental work on EPS has not specifically addressed the role of LB-EPS in cell adhesion in activated sludge. The objectives of the experimental work were to examine the abundance of tightly bound EPS and loosely bound EPS in the sludge produced under different feeding and growth conditions, to correlate the EPS contents and the floc structure and surface properties, and to determine the respective effects of LB-EPS and TB-EPS on the biomass-effluent separation.
Li Anjie Li Xiaoyan Yang Shufang
Key Laboratory of Water and Sediment Sciences of Ministry of Education / State Key Laboratory of Wat Environmental Engineering Research Centre, Department of Civil Engineering,The University of Hong Ko
国际会议
北京
英文
67-68
2011-11-24（万方平台首次上网日期，不代表论文的发表时间）