| Petrochemical industry plays an important role in the economic development of our country, with the rapid development of it, the environmental problems followed can not be ignored, especially, water pollution is more serious. With the work of the national environmental emission reduction policies implements and the pollutant emission standards enhances, the traditional technologies and methods are difficult to meet the new requirements.In order to use the water resources more rationally and save water resource, implement the policy of national environmental emissions, it is necessary to explore and application convenient and economic new technology. Catalytic ozonation technology, as a promising advanced oxidation processes(AOPs), has been widely used in effluent water treatment, drinking water treatment, sewage treatment, and so on. Therefore, more and more environment scientific and technical workers pay attention to it and it has a good application prospect due to its high efficiency, no secondary pollution.Therefore, the drainage outside of petrochemical was treated by ozone catalytic oxidation technology in this paper on the basis of literature. The findings will provide the technical support on promoting the water reuse project.The results show that, firstly, phenol and oxalic acid are treated by the self-made catalyst. Al2O3-Mn can absorb phenol and oxalic acid, but the adsorption capacity of others is little. The removal rate of Al2O3-Mn on phenol is about 50% through catalyst oxidation, and the test result is stable relatively. The effect of Al-Cu0530 and G-Mn0603 catalyst for oxalic acid decreased with the prolonging of time of catalytic oxidation gradually. Al2O3-Cu catalyst has little degradation for oxalic acid, the removal rate of Al2O3-Ti and Al2O3-Mn catalyst for oxalic acid can reach 60% and 52% through catalyst oxidation, respectively. Accordingly, catalytic oxidation effect of Al2O3-Mn is better compared with the others.Then, six kinds of catalysts that available commercially are selected, the results showed that HWS-X and PX catalyst have a high removal rate for COD. Therefore, the optimum parameters of catalyst HWS-X and PX were optimized. The optimal experimental conditions of catalyst HWS-X is: ozone is added at a concentration of 35 mg/L once, dosing time is 15 min, residence time is 30 min, the pH of water is not adjusted, the amount of catalyst is 600 mL. Optimum test conditions of catalyst PX: ozone is added at a concentration of 35 mg/L, dosing time is 20 min, residence time is 30 min, the pH of water is not adjusted, the amount of catalyst is 500 m L. Under the conditions for the optimal test parameters, catalyst HWS-X and PX reduction of COD values are about 62.0 and 30.7 mg/L, respectively. Experimental results of HWS-X catalysts rise first and remain stable then with the increasing of numbers of trails, while the catalytic oxidation effect of PX catalyst decrease. The absorbed saturation HWS-X catalyst after three times, have proximity effect with new catalyst, the adsorption effect for reducing the value of COD reached 54.3 mg/L.Finally, COD removal of the chemical external drainage has a growing trend with the lengthening of reaction time on ozone alone. When the reaction time reaches 30 min, the removal efficiency of COD was only 7.54%. The removal of Al2O3-Mn catalyst for the organic matter of the chemical external drainage is low. When the reaction time is 10 min of HWS-X catalyst, COD and TOC increased suddenly, COD value of the outflow water is increased by 11.53% compared with the raw water. Then, the COD and TOC values decreased gradually as the reaction time. The UV254 and pH of the outflow water remain constant. When a large number of HWS-X catalyst were used to handle the chemical external drainage, the COD of effluent can meet the new national standards. Thus, HWS-X catalyst has good effect in conjunction with ozone. And, the ability of self-made catalyst Al2O3-Mn is equal to the PX catalyst when handle the chemical external drainage. |
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