Abstract
In this study, an experimental apparatus of oxidation + absorption columns was set up to investigated ClO2 and Cl2 emission characteristics when NaClO2 was used as oxidant. Two sets of experiments were designed and compared, one was sampled every 15 min for 2 h and the other one was continuous sampling for 2 h. The results show that the concentration of ClO2 in the outlet of oxidation column increased first and then decreased while Cl2 barely changed during the experiment. The concentration of Cl2 was far less than ClO2, which indicated that the chlorine-containing gaseous component was mainly in the form of ClO2. After 2 h reaction, the chlorine-containing ions in oxidation liquid before and after reaction were in good consistence with the theoretical calculation. High concentration of Cl- was detected in the absorption liquid, while no ClO2- and ClO3- existed. As the reaction proceeded, the oxidation liquid gradually turned into light yellow, and pungent odor released.
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