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• W3044752892 endingPage "141148" @default.
• W3044752892 startingPage "141148" @default.
• W3044752892 abstract "Biofilms are ubiquitous in drinking water systems due to their external matrix of exopolymeric substances (EPS) that provide them protection and adaptability. They are even more common in low flow conditions where hydraulics favor their growth. EPS are organic substances (i.e., proteins, carbohydrates and humic substances) that can react with disinfectant, forming disinfection byproducts (DBP), some of which are controlled by water regulation. However, there is little information available on biofilm-disinfectant interaction and the effect of operational conditions such as biofilm age, water velocity, chlorine and pipeline length on the DBP formation potential of EPS (DBPfpEPS). Using experimental setup and studies of two different biofilms: Biofilm 1 (2.6 ± 0.8 mg Cl/L) and Biofilm 2 (0.7 ± 0.2 mg Cl/L), the DBPfpEPS was studied and compared to the DBPfp of filtered water (FW). The DBP studied were trihalomethanes (THM), haloacetic acids (HAA), haloacetonitriles (HAN), chloropropanones (CP) and chloropicrin (CPK). The DBP concentration trend in both EPS and FW was HAA > THM > CP > HAN > CPK. Biofilm age only increased chloroform (CF)fpEPS in Biofilm 1, while other DBPfpEPS decreased. A direct relationship between water velocity and CFfp in Biofilm 1 was found, probably related to higher chlorine diffusion and the production of a more reactive matrix. Chlorine positively affected DBPfpEPS, increasing Cl-HAA, Cl-THM, CPK and Br-HAN. Biofilm 2 produced higher quantities of EPS per meter of pipeline, this constituting a precursor of intermediary DBP 1,1 dichloropropanone (1,1, DCP). The study compared DBP in chlorinated water in contact with biofilm (BCW) and without (CW). Biofilm 1 increased levels of Cl-HAA, Cl-CP and dichloro-acetonitrile, while Biofilm 2 diminished Cl-HAA and Cl-HAN. Biofilm 1 reduced some Br-HAA in BCW, whereas Biofilm 2 promoted Br-HAA and 1,1, DCP in BCW. EPS and biofilms were significant in terms of their effect on DBP formation." @default.
• W3044752892 created "2020-07-29" @default.
• W3044752892 creator A5023052990 @default.
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• W3044752892 date "2020-12-01" @default.
• W3044752892 modified "2023-10-16" @default.
• W3044752892 title "The effect of operational conditions on the disinfection by-products formation potential of exopolymeric substances from biofilms in drinking water" @default.
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• W3044752892 doi "https://doi.org/10.1016/j.scitotenv.2020.141148" @default.
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