Kinetics model of extracellular polymeric substances extraction.

To evaluate the relations between some factors in extract process of extracellular polymeric substances (EPS) and optimize EPS extract methods, EPS extraction kinetics about EPS concentration change with extract time in EPS extract process was deducted using a newly developed modeling framework. Some data from this study and other researches were used to verify the model. It could acquire some satisfied linear fitting results when used data were from some classic references, with R2 more than 0.94 in every model validation. Some EPS extract experiments were also completed to check the model, where the concentrations of MLSS and MLVSS in activated sludge were (1064.47±298.70) and (822±147)mg/L, respectively. It also could acquire some good fitting results for TOC and protein, but just passable results for DNA and carbohydrate. The EPS extraction kinetics model could be used to rough estimate the high EPS yield concentration and EPS concentration at anytime in the whole extract process.