Assessing Adsorbable Organic Halogen Formation and Precursor Removal during Drinking Water Production

作者：Farre Maria Jose^*; Lyon Bonnie; de Vera Glen A; Stalter Daniel; Gernjak Wolfgang

来源：Journal of Environmental Engineering (United States), 2016, 142(3): 04015087.

DOI：10.1061/(ASCE)EE.1943-7870.0001022

• Adsorbable organic halogen (AOX)
• Total organic halogen (TOX)
• Drinking water
• Disinfection byproducts
• Formation potential

Adsorbable organic halogens (AOX) were measured at the outlet (AOXo) and after 24h contact time with residual disinfectant (AOX24h) for 10 samples obtained from 7 drinking water treatment plants (WTPs) that employ chlorine-based disinfectants. AOXo ranged from 0.75 to 7.60M (26.2-266.0gCl/L) and increased by up to 170% after 24h contact time. The results were also compared with AOX formation potential (AOXFP) measured in the laboratory for the samples collected prior to disinfection at the same WTPs. In general, AOX24h and AOXFP values varied by less than +/- 20%. A suite of disinfection byproducts (DBPs) were individually measured to elucidate the AOX composition. Trihalomethanes and haloacetic acids explained the largest fraction of AOX; however, the percentage of AOX not accounted for by measured DBPs varied greatly between samples (14.5-62.0%). Additionally, the fate of AOXFP was assessed across the seven WTPs. On average, coagulation removed 67 +/- 7% of AOXFP across the WTPs, while dual media filtration did not substantially remove AOXFP. The effect of ozone on AOXFP varied between WTPs, while biological activated carbon filtration removed 33 +/- 13% AOXFP. The ratio of known versus unknown AOXFP did not change across the WTPs.

• 出版日期2016-3