Metabolic Profiles
and Microbial Synergy Mechanism
of Anammox Biomass Enrichment and Membrane Fouling Alleviation in
the Anammox Dynamic Membrane Bioreactor
posted on 2024-03-15, 14:05authored byYijing Zhu, Han Wang, Jia Li, Zhiwei Wang, Yayi Wang
The anammox dynamic membrane bioreactor (DMBR) is promising
in
applications with enhanced anammox biomass enrichment and fouling
alleviation. However, the metabolic mechanism underlying the functional
features of anammox sludge and the biofilm membrane is still obscure.
We investigated the metabolic networks of anammox sludge and membrane
biofilm in the DMBR. The cooperation between anammox and dissimilatory
nitrate reduction to ammonium processes favored the robust anammox
process in the DMBR. The rapid bacterial growth occurred in the DMBR
sludge with 1.33 times higher biomass yield compared to the MBR sludge,
linked to the higher activities of lipid metabolism, nucleotide metabolism,
and B vitamin-related metabolism of the DMBR sludge. The metabolism
of the DMBR biofilm microbial community benefited the fouling alleviation
that the abundant fermentative bacteria and their cooperation with
the anammox sludge microbial community promoted organics degradation.
The intensified degradation of foulants by the DMBR biofilm community
was further evidenced by the active carbohydrate metabolism and the
upregulated vitamin B intermediates in the biofilms of the DMBR. Our
findings provide insights into key metabolic mechanisms for enhanced
biomass enrichment and fouling control of the anammox DMBR, guiding
manipulations and applications for overcoming anammox biomass loss
in the treatment of wastewater under detrimental environmental conditions.