By constructing an anaerobic reaction system,evaluate the response characteristics of efflluent water quality,sludge properties,and bacterial communities under low concentration(lmg/L)and high concentration(l0mg/L)of chlorinated poly fluorinated ether sulfonic acids(F-53B)stress.The results showed that under F-53B stress,the contents of COD,nitrogen(TN,NH4+-N),and phosphorus(TP,PO43-P)in the effluent were elevated,while the relative biomass of sludge(MLVSS/MLSS)showed a decrease,and the higher the concentration of F-53B,the greater the effect.High-throughput sequencing analysis revealed that only the diversity of bacterial communities(ACE,Chaol,and PD_whole_tree indices)significantly decreased under high concentration F-53B stress compared to the control group(0mg/L F-53B).Additionally,the study found that with prolonged exposure to high concentration F-53B,the relative abundance of Firmicutes phylum gradually increased,while the relative abundance of Proteobacteria,Bacteroidota and Nitrospirota decreased.Furthermore,based on FAPROTAX functional prediction analysis,microorganisms exhibited lower nitrogen(N)metabolism potential and higher chemoheterotrophic and fermentative capabilities under F-53B stress.Redundancy analysis(RDA)indicated that the Firmicutes was mainly positively influenced by F-53B and positively correlated with TN and NH4+-N,while the Proteobacteria was negatively influenced by F-53B and positively correlated with COD,TP,and PO43-P.Revealed the stress mechanism of a novel fluoride compound,F-53B,on wastewater anaerobic treatment systems.
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