Mn-Al_2O_3/O_3催化氧化深度处理制药废水

以活性氧化铝球为载体,采用静置、搅拌、超声3种方法制备了Mn-Al_2O_3催化剂,通过XRD、SEM等手段比较了不同方法制备的催化剂的性能。并采用以搅拌法制备的Mn-Al_2O_3催化剂与臭氧联用来处理制药废水,分析了臭氧投加量、Mn-Al_2O_3催化剂投加量、pH值和反应时间对处理效果的影响,同时对反应过程进行了动力学分析。试验结果表明,当制药废水体积为1 L、臭氧投加量为4. 8 g/h、Mn-Al_2O_3催化剂投加量为300 g、pH值为7、反应时间为30 min时,对COD的去除率高达55. 6%,且Mn-Al_2O_3/O_3催化氧化过程符合拟一级动力学方程,对COD的降解速率常数为0. 026 41 min^-1。

Advanced Treatment of Pharmaceutical Wastewater by Mn-Al_2O_3/O_3 Catalytic Oxidation

Mn-Al2O3 catalysts were prepared by standing, stirring and sonication methods by using activated aluminum oxide balls as the carrier, and properties of the catalyst prepared by different methods were compared by means of X-ray diffraction ( XRD ) and scanning electron microscopy ( SEM ). Pharmaceutical wastewater was treated by the Mn-Al2O3 catalysts prepared by stining method combined with ozone. Meanwhile, the effect of ozone dosage, catalyst dosage, pH value and reaction time on treatment efficiency was explored, and kinetics of the reaction process was analyzed. The results showed that the removal rate of COD was up to 55. 6% when volume of the pharmaceutical wastewater was 1 L, the dosage of ozone was 4. 8 g/h, the dosage of the catalyst was 300 g, pH value was 7 and reaction time was 30 min. Moreover, the Mn-Al2O3/O3 catalytic oxidation process conformed to pseudo-first-order kinetic equation, and the degradation rate constant of COD was 0. 026 41 min ^-1.