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Degradation of Humic Acid and Formation of Formaldehyde in PEROXONE Processes
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.1, pp.80-87
Kim,
K. W., &
Rhee,
D.
S.
(2001). Degradation of Humic Acid and Formation of Formaldehyde in PEROXONE Processes. Analytical Science and Technology, 14(1), 80-87.
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Abstract
This research was studied the action of the coupling ozone-hydrogen peroxide on aqueous humic acid. PEROXONE process is enhanced the generation of hydroxyl radicals which is effective for degradation of organic matters. Therefore the changes of <TEX>$UV_{254}$</TEX> and TOC were investigated through the change of concentrations, injection time of <TEX>$H_2O_2$</TEX>, initial pH of aqueous humic acid and concentrations of radical savenger as <TEX>$HCO_3{^-}$</TEX> in the PEROXONE processes. And the GC/ECD was used to detect the formaldehyde formed by ozonation of humic acid. From the experimental results, concentrations and injection time of <TEX>$H_2O_2$</TEX> and initial pH in solution in the PEROXONE processes were very important for enhancing the efficiency of degradation in humic acid. The results indicated that removal efficiency of TOC was the highest when concentration of <TEX>$H_2O_2$</TEX> was 5mg/L, injection time of <TEX>$H_2O_2$</TEX> was 5 minutes and initial pH in solution was 10.5. And presence of alkalinity in solution was reduced the efficiency of treatment. The formaldehyde were formed less PEROXONE processes than only ozone. When initial pH in solution were changed from 3.5 to 10.5, the formaldehyde were formed highest concentration at pH 5.
- keywords
- humic acid, ozonation by-products, formaldehyde, TOC, <TEX>$UV_{254}$</TEX>, PEROXONE process
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