Nonlinear Dynamics Research Of Membrane Bioreactor In Sewage Treatment

Advantages of membrane bioreactor (MBR) are increasingly in evidence in sewage treatment. But the problem of membrane pollution has become a bottleneck blocking the development of the technics. In the three kinds of impact, the characteristic of sludge has played an important role in membrane pollution and has been the main aspect of research in membrane pollution.In this paper, A two dimension mathematical model which is applicable for membrane bioreactor (MBR) was proposed by simplifying the dynamical relations in ASM1 active sludge model. With some new parameter combinations, the simulation results fit the testing data well, so the accuracy of this model was proved. Then the boundedness and the stability of this model was analyzed in the view of nonlinear dynamics, and the choice region of the parameters was gained theoretically.In the research of theory of the building of EPS and SMP, One new mathematical model was proposed to explain the relationships among between soluble microbial product and extra cellular polymeric substances in MBR. This model has a simple structure with only four variables:Original substrate,active biomass, soluble microbial product and extra cellular polymeric substances. With a set of parameters model outputs capture all trends observed in the experiment.