| Summary: | <p>Fenton's reaction is one alternative technology in wastewater treatment. In this
reaction, the reactive hydroxyl radical (OHâ¢) can easily oxidize many organic
molecules. 2,4-dinitrophenol (DNP) was used as a model pollutant in this study. The
ratio of concentration of DNP and Fenton's reagent (Fe<sup>2+</sup> and H<sub>2</sub>O<sub>2</sub>) played an
important role in this process, which determined the performance of the reaction. As
part of Fenton's reaction, oxygen was produced and consumed by the DNP-OHâ¢
radical. Based on observations of dissolved oxygen (DO) during the reaction, a typical
DO profile was obtained and it was used to develop a computer-controlled Fenton's
oxidation process.</p>
<p>Several reaction cycles were conducted in order to monitor the reliability of the
control program. The experimental results show that the methods applied in the
program could anticipate the trend of the DO curve and effectively handle the
variability of the DO data received from the DO meter. The end-point of the Fenton's
reaction could be identified by the control system. At the end point, DO concentration
began increasing and there was no DNP detected in the solution. From these
observations, it was discovered that the DO concentration can reflect the progress of the
reaction and it can be used as an parameter for controlling the process.</p>
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