Identification of the change of soluble microbial products on membrane fouling in membrane bioreactor (MBR)

Publication year: 2011
Source: Desalination, In Press, Corrected Proof, Available online 14 June 2011

Meng, Yao , Bradley, Ladewig , Kaisong, Zhang

Comprehensive fouling propensity associated with the change of soluble microbial products (SMP), especially the concentration of SMP and the ratio of protein to polysaccharide (PN/PS) has been investigated in a lab-scale submerged microfiltration MBR. Results showed that the higher ratio of PN/PS induced less irreversible fouling and improved the interaction of protein and polysaccharide to form cake layer. The rejection efficiency of major components in SMP also increased with higher PN/PS ratios. Fouling mechanisms altered from combination of intermediate pore blocking and cake formation at initial stage to cake formation on the membrane surface during long-term operation. Moreover, the irreversible…