Recently, spherical beads entrapping quorum quenching (QQ) bacteria have been reported as effective moving QQ-media for biofouling control in MBRs for wastewater treatment owing to their combined effects of biological (i.e., quorum quenching) and physical washing. Taking into account both the mass transfer of signal molecules through the QQ-medium and collision efficiencies of the QQ-medium against the filtration membranes in a bioreactor, a cylindrical medium (QQ-cylinder) was developed as a new shape of moving QQ-medium. The QQ-cylinders were compared with previous QQ-beads in terms of the QQ activity and the physical washing effect under identical loading volumes of each medium in batch tests. It was found that the QQ activity of a QQ-medium was highly dependent on its specific surface area, regardless of the shape of the medium. In contrast, the physical washing effect of a QQ-medium was greatly affected by its geometric structure. The enhanced anti-biofouling property of the QQ-cylinders relative to QQ-beads was confirmed in a continuous laboratoryscale MBR with a flat-sheet membrane module.
Bibliographical noteFunding Information:
This research was supported by the Convergence Technology Program (2015001640001) funded by the Korea Ministry of Environment (MOE). The authors wish to thank Prof. Michael Givskov at the University of Copenhagen for kindly providing E. coli JB525.
All Science Journal Classification (ASJC) codes
- Applied Microbiology and Biotechnology