Perfluoroalkyl and polyfluoroalkyl substances(PFASs)are synthetic organic fluorinated compounds known for their excellent stabilizing,hydrophobic and oleophobic properties,and are therefore widely used in the chemical industry.They are of great concern due to their persistence,toxicity to life on earth,tendency to bioaccumulate,and adverse health and ecological effects.In this study,perfluorobutanesulfonic acid(PFBS),a typical compound of PFASs,was chosen to study the response of anammox upon long-term exposure to different concentrations of PFBS.Different PFBS concentrations(200 ng/L,100 μg/L,50 mg/L)were set to affect the physicochemical properties of sludge.The results showed that with the increase of PFBS concentration sludge flocs were destroyed and metabolites changed,even to the point of causing the death of microorganisms to wither away.
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