Correlation of typical disinfection by-products retained by nanofiltration in pilot-scale study based on spectral analysis
To enhance water resource utilization at a water treatment plant in North,Nanofil-tration(NF)technology was employed to treat Ultrafiltration(UF)effluent derived from the backwash water of the plant's filtration process.A comparative investigation was conducted to as-sess the impact of five distinct NF membranes(T membrane,H membrane,F membrane,N270 membrane,and N90 membrane)on the quality improvement of the treated water.Additionally,this study explored the applicability of the EEM and UV spectroscopy(Different absorbance)in in-dicating the presence of typical DBPs.The results revealed that the N90 membrane exhibited the i-deal retention rates for TCM and BDCM in the UF effluent,achieving 76.29％and 100％respec-tively.The N270 membrane followed closely,while the T membrane demonstrated a comparative-ly lower retention effect.EEM-PARAFAC analysis of the UF effluent identified major components such as C1 fulvic acid,C2 humic acid,and C3 microbial metabolites.Furthermore,Gaussian fit-ting of different absorbance spectroscopy(DAS)in influent and effluent water revealed four charac-teristic peaks denoted as A1 to A4.Correlation analysis between spectral parameters and DBPs indi-cated that,for TCM,the component C2 derived from PARAFAC analysis exhibited the highest correlation coefficient at 0.83.In the case of BDCM,the highest correlation at 0.68 was observed with A3 obtained from DAS.This study aimed to identify the most suitable NF membrane for im-proving the water quality of the plant and provides valuable insights for predicting subsequent wa-ter quality regarding the impact of DBPs on regeneration and reuse.
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