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Inhibiting the regeneration of N-nitrosodimethylamine in drinking water by UV photolysis combined with ozonation

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Abstract.
N-Nitrosodimethylamine (NDMA) is a highly carcinogenic compound that is suspected of carcinogenic
activity in the human body. A variety of methods are used to remove NDMA from water, but the
main degradation products, dimethylamine (DMA) and NO2−, are also precursors for NDMA formation.
UV irradiation combined with ozonation (UV/O3) was examined in this investigation for its ability to
inhibit the regeneration of NDMA after degradation. Both the degradation products and the regeneration
potential of NDMA were compared between UV irradiation alone and UV/O3. The yields of DMA and NO2
− in the UV/O3 process were less than for UV irradiation alone. Yields of DMA and NO2− were 2.25mgL−1 and 3.22mgL−1 from UV irradiation, while they were 0.92mgL−1 and 0.45mgL−1 from the UV/O3 process. Furthermore, the regeneration of NDMA was also less after the UV/O3 process than after UV irradiation. The concentration of regenerated NDMA was more than 51.8 ugL−1 fter UV irradiation regardless of the dosage of Cl2. However, the concentration of regenerated NDMA in the UV/O3 process was less than 7.37 ugL−1 under the same conditions. Consequently, the UV/O3 process was more effective than UV irradiation alone in inhibiting NDMA regeneration. The inhibition of NDMA regeneration was due to a decrease in DMA and NO2− produced by the UV/O3 process. As the major products generated from NDMA, NO2− and DMA were likely to be oxidized by ozone and
hydroxyl radicals (•OH). In addition, the reaction between NDMA and •OH would possibly generate methylamine as the only product, leading to a decrease in the production of DMA by the UV/O3 process.

Keywords:
UV irradiation
UV/O3
N-Nitrosodimethylamine
Dimethylamine
Hydroxyl radical

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 168 (2009) 108–114

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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