The Fenton's reagent was applied to decolor and degrade 2,4-dinitrophenol (DNP). Different concentrations of ferrous ion (Fe 2+ ) and hydrogen peroxide (H 2 O 2 ) were dosed to investigate their influences on the removal of DNP. The ADMI color value was adopted as an index to indicate the decoloring performance of the reaction. Low molecular weight of organic acids was monitored, and the role of dissolved oxygen during the DNP degradation was discussed.Results show that due to productions of colored intermediates and the oxalic acid, DNP was quickly removed, followed by the ADMI color value and DOC, respectively. Both initial removal rates of DNP and ADMI color value increased 935

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