Effect of EPS Content on Activated Sludge Reduction in Process of Predation by T. tubifex

[摘要] A Sludge reduction in a conventional activated sludge process combined with a membrane biofilm inoculated with T.Tubifex was investigated. The influence of microbial extracellular polymeric substances (EPS) extracted in forms of LB-EPS and TB-EPS respectively on the surface properties of biomass was studied. Results showed that variations of polysaccharides and protein along with the increasing of EPS feeding would affect the existence of T.Tubifex. When the amount of EPS varied from 10 to 50μg/mg, the specific resistance of a sludge suspension was obtained from 3.5×107to 1.4×107S2/g. Meanwhile, polysaccharides content in EPS was to be positively correlated with the SSR of sludge suspension whereas protein content would be not. Anyway, it can be argued that an increase in LB-EPS not TB-EPS may affect the performance of activated sludge reduction with efficiency about 40.1% to 31.6%.

[发布机构] Department of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin; 300384, China^1;Fujian Provincial Key Laboratory of Photo Catalysis State Key Laboratory Breeding Base, College of Civil Engineering, Fuzhou University, Fuzhou, FUJIAN; 350108, China^2;Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo, Shaanxi, 726000, China^3

[关键词] Activated sludge;Conventional activated sludges;Extracellular polymeric substances;In-process;Protein contents;Sludge reduction;Specific resistances