Temporal changes in extracellular polymeric substances on hydrophobic and hydrophilic membrane surfaces in a submerged membrane bioreactor /Gerald Matar a , Graciela Gonzalez-Gil a, b , Husnul Maab a , Suzana Nunes a , Pierre Le-Clech c , Johannes Vrouwenvelder a, d, e , Pascal E. Saikaly a, * - Matar,Gerald