| As a representative detonating explosives in the nitro-diazotized category, diazodinitrophenol(DDNP) has been widely used, because of its excellent performance, abundant raw materials, low cost and comparatively safe production, especially in manufacture of industrial blasting detonators. However, DDNP wastewater contain some hazardous substances, such as diazodinitrophenol, nitro-compound, sulfide and phenolic compound, all of which are toxic organic wastewater, exerting high pollution on the environment and impact on the healthy of nearby residents if proper handle is not given. Although there are some treatment programs, these programs fail to be widely used in the real operation because of their poor effect, or technical problems and the economic reasons. Some manufacturers forced to stop production because they can not reach the emission standards. Therefore, the DDNP wastewater brings about aseries of problems to people and the society.The wastewater was treated by catalytic ozonation technology in this paper, effects of different factors on processing results were discussed and the reasons which may lead to its generating were analyzed, at last the optimum technological parameters were obtained. The result of the test shows that the treated water can reach the corresponding national wastewater discharge standards. All in all, this method which is used in the treatment of DDNP wastewater, has high potential value and broad application prospect. In the meantime, it can be also used for the reference in netrophenolic organic wastewater treatment.The main contents of this article includes the following four aspects:First of all, the paper examined the ozonization of DDNP wastewater. By employing the single-factor method, the study further investigated the effects of different technological parameters, including the processing time, temperature, pH value and the concentration of ozone. The result of the study showed that under such a condition of the processing time of 40 min, temperature of 20℃, pH value 9, the concentration of ozone of 1.32mg/L, the CODCr, nitrophenols, chroma could reach to 140.04mg/L, 1.5mg/L and 202. Secondly, In order to enhance the effects of treatment, the strengthening oxidation process of catalysts was introduced, the catalysis of the active components(copper ion and iron ion nitrate salts) were added into treated water, the catalysis were screened out which had the best treatment effect towards the wastewater.Thirdly, heterogeneous catalyst was prepared with the active ingredient of catalyst which soaks on the carrier. The pH value, reaction temperature, concentration of ozone, adsorption of heterogeneous catalysts in testing process, which influent the CODcr's removal efficiency, are investigated. The results showed that under such a condition of the processing time of 30 min, temperature of 20℃, pH value 12, the concentration of ozone of 1.32mg / L, the velocity of flow of 400ml/min, the CODCr, chroma and nitrophenols could reach 73.15mg/L, 43 and 0.97mg/L, industrial emission standards can be reached.Finally, based on the data of experiment, the utilization of ozone is preliminarily calculated. The utilization of ozone can be reached about 41percent when only use the ozone to dispose the DDNP wastewater. However, the utilization of ozone has great elevation, which can be reached above 76 percent when use heterogeneous catalytic ozonation to dispose DDNP wastewater.
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