Microbial Adhesion and Biofilm Formation on Microfiltration Membranes: A Detailed Characterization Using Model Organisms with Increasing Complexity

Table 5

Results of RDA permutation analyses on bacterial community data derived from ARISA, testing for the effects of membrane type (PE, PSF, and PVDF), treatment (adhesion, Ringer, biofilm), and the interaction between both factors. 𝜆₁ and 𝜆₂ represent the eigenvalues of the first and second axes. 𝜆_tot represents the percentage of total community variation explained by the experimental factors.

	𝜆1	𝜆2	𝜆tot	𝐹	𝑃
Static assay in lab-scale MBR
Membrane	0.066	0.014	8%	1.062	0.382
Treatment (adhesion-Ringer-biofilm)	0.247	0.113	36%	4.809	<0.001
Membrane * treatments	0.263	0.114	43%	2.161	0.007

Significant values are in bold.