臭氧催化氧化处理苯酚废水研究

Degradation of Aqueous Phenol by Catalytic Ozonation

采用臭氧催化氧化法处理苯酚废水,用自制的催化剂--活性炭负载金属氧化物(Fe/AC,Cu/AC,Mn/AC)对模拟苯酚废水进行臭氧催化氧化比较,并对影响催化氧化效果的几个因素:不同的活性组成分、初始COD、反应时间、pH值进行了分析。结果表明:在每次处理量为500mL苯酚废水时,负载铁氧化物的活性炭催化剂用量为15g、反应时间为40min、COD初始浓度为1000mg/L、pH值为9、臭氧投加量为10mg/L,催化氧化具有较佳的效果;催化剂的重复利用性较好,连续使用11次,COD的去除率仍可达70.4%;通过GC-MS的检测,推测其反应机理为:苯酚→苯二酚类及苯醌类化合物→醛酮类化合物→羧酸类化合物→CO2。

The reactive phenol wastewater was treated by ozone catalytic oxidization systems. Different activated carbon supported metal oxides,i.e. Fe/AC(iron carried by activated carbon) ,Cu/AC,Mn/AC,were used in these simulations as the catalysts to get the optimal reaction conditions such as different active component,initial COD,reaction time,and pH value. The results showed that when the Fe/AC is 15g/500mL,reaction time is 40min,the initial COD is 1000mg/L,pH is 9,and adding ozone amount is 10mg/L,COD removal rate can still reach 70.4% after the catalyst was used 11 times continuously. Using GC-MS,we can presume that the reaction mechanism is phenol hydroquinone compounds or benzoquinones compounds aldehydes and ketones compounds carboxylic compounds CO2,H2O.