Mathematical modeling and effects of temperature and pressure on membrane fouling

Abstract

We use the membrane bioreactor (MBR) to treat the effluent from the high concentration wastewater of traditional Chinese medicine(TCM) wastewater from two-phase anaerobic digestion, and effects of sludge concentration(MLSS) on the flux-attenuation of the MBR under different temperature and pressure conditions were discussed. A mathematical model was made to indicate the variation of membrane flux with MLSS with different operations. The result showed that: the membrane flux not only related with MLSS but also with other operating conditions. Under different operating conditions, with the variation of temperature(14°C, 23°C, 31°C)and pressure (10kPa, 20kPa, 30kPa), the membrane flux decreased with the increasing of MLSS and the membrane flux has the positive associations with temperature and pressure under certain MLSS. In order to describe the tendency, we analyzed the relationship and set a mathematical model of membrane flux and MLSS under different operation conditions of temperature and pressure. From the model we found the membrane flux has the negative correlation with MLSS under every operation condition. The membrane flux decreased with the increasing of MLSS which also proves the increasing of temperature and pressure is better for the increasing of in membrane flux.