Influence of Different Water Treatment Processes on the Concentration of Perfluoroalkyl Substances in Waterworks
Perfluoroalkyl substances(PFASs)are a new type of pollutants with toxic,accumulative and persistent properties.This pa-per collected and analyzed water samples from the source water,end water and different process steps of a tap water treatment plant in Chengdu to study the effects of treatment processes on the removal of PFASs.The results show that Perfluorooctanoic acid(PFOA)has the highest concentration in all samples,followed by perfluorobutanoic acid(PFBA),accounting for 26.7%～74.1%and 12.0%～26.0%,respectively,suggesting that PFOA and PFBA are the main PFASs.After the treatment,the total concentrations of twelve PFASs decreased from 2.22 ng/L(source water)to 1.74 ng/L(end water),with the removal rate of 21.6%.The result indi-cated that the tap water treatment plant is effective in the removal of PFASs.The highest concentration of Σ12PFASs(4.42 ng/L)occurred at the folded plate reactor,and PFOA accounted for the highest proportion.Coagulation displayed the greatest removal effi-ciency of PFASs,with a removal rate of 48.9%.The concentrations of PFOA and(perfluorooctane sulfonic acid,PFOS)in the final water of this treatment plant are far below the limit values of the"Standards for Drinking Water Quality"(GB 5747-2022),so it can and meet the requirements of daily water safety.
perfluoroalkyl substances(PFASs)tap water treatment processtap waterremoval efficiency
NETL
NSTL
万方数据
