Study On The Advanced Catalytic Oxidation Treatment Of Petrochemical Drainage Outside The Enterprises

China's water resources per capita is less than the world average of 1/4,severe water shortage, so the production of wastewater treatment and reuse of depth is important. Ozone is a strong oxidant,the oxidation capacity is 1.52 times of chlorine. The oxidation reaction product will not bring secondary pollution, the remaining decomposition of ozone into oxygen, is very environmental. This paper studies the depth of water outside the petrochemical treatment and reuse, the corresponding metal oxide catalyst preparation process and the outer water treatment process.This paper studies the preparation of catalyst. With certain concentration of metal salt solution as a binder,γ-Al2O3 balls were made which were calcined at the temperature of 300℃-400℃for 2-5 hours to prepareγ-Al2O3 catalyst. This balls, the catalyst carrier, were impregnated with different concentrations of Fe (Ⅲ),Ce (Ⅲ),Cu (Ⅱ),Mn (Ⅱ), Ni(Ⅱ), Co(Ⅳ) salt, and were calcined for 3 hours into the roasting Kinds of catalyst.The research shows the metal oxide catalyst has certain effect on the removal of CODcr of external drainage in the petrochemical enterprises.in which the load MnO2γ-Al2O3 catalysts has the maximum efficiency.The results show that with the MnO2/γ-Al2O3 catalyst, the ozone has good removal results for the of CODcr of external drainage, oil and ammonia nitrogen. When the ozone dosage was to 65mg/L with 20min contact time, the CODcr of treated water samples was less than 20mg/L, removal efficiency was 75.38%;Ammonia concentration was decreased to 2mg/L or so, the removal rate reached 56.3%;Oil removal rate was 86.3%. When CODcr, oil, ammonia concentration in water samples was decreased to a certain extent, the lower concentration of reducing substance, the more difficult for oxidation and the remaining material was difficult to oxidize therefore, continuingto increase the ozone dosage and contact time for the water Impurities had no significant effect Ozone oxidation had significant effect on the removal of CODcr,and oil, the sllight effect on ammonia and nitrogen.It was found that the catalyst layer height had on great influence on removal of CODcr,oxidation was mainly concentrated in the catalyst layer 40cm below the partially.When the fill-storey was more than 40cm, CODcr concentration significantly reduced, and easily oxidized organic ingredients in the water had been disposed the first 40cm catalyst layer, in the layer with low concentrations of ozone,and low concentrations of oxidizable substances, thus the catalyst layer later had no significant effect on the removal of CODcr.It was also found was the height of the catalyst layer above 30cm, in the processing device within the air resistance increasing, there was air disturbance, energy consumption increased and the catalyst was wasted, so the catalyst layer height was selected 30cm.The results of this study was carried out in the Jin Cheng petrochemical industry, the enterprise outside wastewater was treated deeply, water after the ozone treatment meets to the require of the recycling supply water, which not only saves water, but also protects the environment, with obvious economic and social benefits.