Nima Nazari - Department of Chemical Sciences, Islamic Azad University-South Tehran Branch, Tehran, Iran.
Pouyan Shams Farahsary - Department of Chemical Sciences, Islamic Azad University-South Tehran Branch, Tehran, Iran.
Mehran Moazeni Targhi - Department of Chemical Sciences, Islamic Azad University-South Tehran Branch, Tehran, Iran.

In recent years membrane bioreactors filtration is increasingly used in wastewater treatment to enhance the quality of wastewater. The main problem in preventing the widespread use of membrane bioreactor is itscongestion which has a severe impact on output flux to time ratio. If solid suspensions with high concentrations exist in the wastewater, this influence will be even more severe. In addition to the suspended solids in the liquidmixture, Extracellular polymeric materials (EPS) and soluble microbial products (SMP) are also known as basic microbial products that cause membrane fouling. EPS can be calculated within and on the membranewhich increases the viscosity of suspended solids in the liquid mixture and increases filtration resistance. SMPs cannot penetrate the pores of the ultrafiltration membrane due to the limited size of the pores which would cause fouling in membrane processes. According to the above issues, providing a model that indicates the properties and conditions of formation anddestruction of SMP and EPS at the same time seems necessary. In this paper, CFD modelling of biological fouling in membrane bioreactor is provided using Fluent software.

Membrane Bioreactor, Filtration, Fouling, Extracellular Polymeric Substances, Soluble Microbial Products