Far-UVC 222 nm Treatment: Effects of Nitrate/Nitrite on Disinfection Byproduct Formation Potential.

ABSTRACT: Irradiation at far ultraviolet C (far-UVC) 222 nm by krypton chloride (KrCl*) excilamps can enhance microbial disinfection and micropollutant photolysis/oxidation. However, nitrate/nitrite, which absorbs strongly at 222 nm, may affect the formation of disinfection byproducts (DBPs). Herein, we evaluated model organic matter and real water samples and observed a substantial increase in the formation potential for trichloronitromethane (chloropicrin) (TCNM-FP), a nitrogenous DBP, by nitrate or nitrite after irradiation at 222 nm. At a disinfection dose of 100 mJ·cm^-2, TCNM-FP of humic acids and fulvic acids increased from ∼0.4 to 25 and 43 μg·L^-1, respectively, by the presence of 10 mg-N·L^-1 nitrate. For the effect of nitrate concentration, the TCNM-FP peak w

SUBMITTER: Xu J 

PROVIDER: S-EPMC11360365 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature