Differential analysis of microbial diversity between biological flocs and activated sludge (produced from furfural residue washing wastewater)

Biological floc technology (BFT) is an improved activated sludge technology. The improvement lies in the use of safe microorganisms to form BF, giving them nutritional value and probiotic functions. Based on this theory, if we supplement edible microorganisms into organic wastewater treatment, it is possible to also harvest biological flocs instead of activated sludge. In this way, we will achieve the goal of resource utilization of organic wastewater and reduction of sludge. In this study, we will use metagenomic technology to investigate the differences between the two microorganisms. In sludge group, Pseudomonadales (7.91%), Xanthomonadales (37.52%), and Burkholderiales (1.12%) were the largest proportion of bacteria. In contrast, in the BF group, Leptospirales (0.66%), Saccharomycetales (14.83%), Lactobacillales (26.01%), and Mucorales (19.63%) were the largest proportion. We evaluated the function of the dominant strains and the role they may play in BF system. Results show that BF produced from FR wastewater has the function like microbial feed additive.