Nitrite formation during low pressure ultraviolet lamp irradiation of nitrate

Ning Lu, Nai Yun Gao, Yang Deng, Qing Song Li

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

During ultraviolet light (UV) disinfection, nitrate (NO3 -) present in raw water may transform to nitrite (NO2 -) that can cause serious human diseases. In this study, the formation of NO2- from NO3- was studied at different experimental conditions under the irradiation of a low-pressure ultraviolet (LPUV) lamp at 253.9 nm. The investigated experimental variables included initial NO3- concentration, solution pH (6.2-9.5), and hydrogen peroxide (H2O2) dose (0-25 mg L-1). Moreover, the effect of titanium dioxide (TiO2) was determined. Results showed that the formation of NO2- was enhanced at a high initial NO3- concentration and a high pH, but was inhibited, to some different degrees, by introduction of H 2O2 or photocatalyst TiO2. The effect of pH on NO2- formation was probably due to the impact of hydrogen ion on the stability of several intermediates such as peroxynitrite (ONOO -), N2O3, and N2O4. And the inhibiting effects of H2O2 and TiO2 were attributable to production of additional hydroxyl radical (·OH) that scavenged NO2-. At pH 9.5 and an initial NO 3- concentration of 10 mgL-1 NO 3--N, the concentration of NO2- produced was above 0.1 mgL-1 NO2--N, the Germany drinking water standard. When 25 mgL-1 H2O 2 was added, the NO2- level was decreased below the standard.

Original languageEnglish
Pages (from-to)1393-1400
Number of pages8
JournalWater Science and Technology
Volume60
Issue number6
DOIs
StatePublished - 1 Dec 2009

Fingerprint

Ultraviolet lamps
nitrite
low pressure
Nitrates
irradiation
Irradiation
nitrate
Disinfection
Photocatalysts
Hydrogen peroxide
Potable water
Titanium dioxide
hydroxyl radical
disinfection
Hydrogen
hydrogen peroxide
Ions
transform
drinking water
hydrogen

Keywords

  • Low-pressure UV lamp
  • Nitrate
  • Nitrite
  • Photolysis

Cite this

Lu, Ning ; Gao, Nai Yun ; Deng, Yang ; Li, Qing Song. / Nitrite formation during low pressure ultraviolet lamp irradiation of nitrate. In: Water Science and Technology. 2009 ; Vol. 60, No. 6. pp. 1393-1400.
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Nitrite formation during low pressure ultraviolet lamp irradiation of nitrate. / Lu, Ning; Gao, Nai Yun; Deng, Yang; Li, Qing Song.

In: Water Science and Technology, Vol. 60, No. 6, 01.12.2009, p. 1393-1400.

Research output: Contribution to journalArticle

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