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Ozonation of humic acid in water

✍ Scribed by Hengfeng Miao; Wenyi Tao

Publisher
Wiley (John Wiley & Sons)
Year
2008
Tongue
English
Weight
288 KB
Volume
83
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

BACKGROUND: Humic acids (HAs) are heterogeneous macromolecules widely dispersed in natural waters, which display significant resistance to biodegradation. Removal of HA by ozone and its related reaction mechanisms are investigated.

RESULTS: Ozonation of HA showed a significant reduction of UV~254~, Color~436~ and had the capability of mineralizing the TOC to CO~2~ and improving the biodegradability. Fourier trandform infrared (FT‐IR) spectra, elemental composition analysis and high performance size exclusion chromatography (HPSEC) revealed that ozonation could not only change the structure characteristics but modify the molecular size distribution of HA. Volatile compounds detected by gas chromatography‐mass spectroscopy (GC‐MS) showed that ozonation brought out 43 different organics, which were identified as mainly: aldehydes, ketones, aromatics, carboxylic acids and alcohols.

CONCLUSION: Ozonation of HA could be elucidated by the followed mechanism: ozonation with its direct and indirect pathway hydroxylated the HA in water, and polyhydroxy HA was further oxidized to bond rupture leading to the change of molecular structure and size distribution of HA, trimming out a series of small molecular volatile compounds. The volatile compounds with electron denoting group could be further oxidized to acids and esters, and even totally mineralized to CO~2~. Copyright © 2007 Society of Chemical Industry

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