QQ-PAC core-shell structured quorum quenching beads for potential membrane antifouling properties

[Display omitted] •Double-layer gel beads were prepared to promote the synergistic effect of QQ bacteria and PAC.•The surface of the porous shell-with PAC layer was rough and uneven.•The core part QQ bacteria embedded was a dense sponge structure.•The addition of PAC into the shell can improve the mass transfer conditions and adsorption capacity. Quorum quenching (QQ) has been proven to be an effective method to reduce MBR membrane biological contamination. In this paper, a novel and efficient QQ-PAC core-shell beads were prepared for mitigating the membrane contamination. The bead was composed of two parts: QQ bacteria embedded in the core and PAC in the shell. The microstructure of the bead was observed by scanning electron microscopy (SEM) and the functional groups were revealed by Fourier transform infrared spectroscopy (FTIR). Meanwhile, the mechanical strength, swelling property, penetration property and QQ activity of the core bead, the core shell-without PAC bead and the core shell-with PAC bead were compared. The core shell-with PAC structure improved the adsorption capacity under good mass transfer conditions. Besides, the combined effect of QQ bacteria and PAC enhanced the QQ effect and alleviated the process of MBR membrane biological contamination consequently. Therefore, the QQ-PAC core-shell beads have a potential possibility in MBR membrane fouling control as the immobilization technology of QQ bacteria.