臭氧/活性炭/真空紫外光联用处理甲基肼废水的影响因素

Influencing factors of methylhydrazine wastewater treatment by O_3/VUV using activated carbon as catalyst

研究比较了臭氧氧化(O3)、臭氧/活性炭氧化(O3/AC)、真空紫外/臭氧(VUV/O3)、真空紫外/臭氧/活性炭氧化(VUV/O3/AC)对甲基肼废水的处理效果,以甲基肼和COD去除率为指标,其中VUV/O3/AC最为有效。考察了活性炭投加量、臭氧投加量、初始pH值和活性炭使用次数等因素的影响。结果表明,反应最佳工艺条件为臭氧投加4.2 mg·min^(-1)、pH值为9.60、活性炭投加量为6 g·L^(-1)。反应60 min,甲基肼去除率可达99.3%,COD去除率可达75.7%。同时,探究了活性炭的重复使用效果,分析了反应过程的中间产物。

In this research,the results of four ozone-based advanced oxidation processes（ O_3,O_3/AC,VUV/O_3,and VUV/O_3/AC） were compared for the treatment of propellant asymmetrical methylhydrazine.Based on the removal efficiency of methylhydrazine and COD,the most efficient method was VUV/O_3/AC. The factors that affected removal efficiency,including dosage of activated carbon,dosage of ozone,the initial pH value,and the addition frequency of activated carbon,were investigated. The results showed that the optimal conditions were dosage of ozone 4. 2 mg·min^-1,pH 9. 60,and dosage of activated carbon 6 g·L^-1. Under optimum conditions,after 60 min treatment,the removal efficiency of methylhydrazine and COD could reach 99. 3% and75. 7%,respectively. In addition,the effect from repeated addition of activated carbon,and the intermediates created during the reaction process,were also investigated in this article.