负载型FeOOH催化臭氧氧化对HAAsFP的控制效果

Control of HAAs Formation Potential Using Supported Goethite-catalyzed Ozonation

考察了在连续流体系中,滤后水经负载型羟基氧化铁(FeOOH)催化臭氧氧化后5种卤乙酸的生成势(HAAsFP)。结果发现,经负载型FeOOH催化臭氧氧化后,滤后水的HAAsFP比单独臭氧氧化后的降低了33.1%,对TOC较高的去除率及.OH对卤代活性位较高的破坏能力,可能是连续流体系中催化臭氧氧化进一步控制HAAsFP的主要原因。同时还考察了Br-浓度、O3投量及停留时间对连续流体系中催化臭氧氧化控制滤后水中HAAsFP的影响。结果表明,在不同的反应条件下,FeOOH催化臭氧氧化都表现出明显控制HAAsFP的优势。Br-浓度的增加提高了溴代HAAs的比例,当[Br-]=1 mg/L时,FeOOH催化臭氧氧化降低滤后水中HAAsFP的优势相对更明显。增大臭氧投量和延长接触氧化的停留时间都能使FeOOH催化臭氧氧化滤后水中的HAAsFP值进一步降低。

Five haloacetic acids formation potentials （HAAsFP） of filtered water after catalytic ozonation with supported ferric hydroxide （FeOOH） were investigated in a continuous flow reactor. HAAsFP of filtered water after catalytic ozonation with supported FeOOH are 33.1% lower than those af- ter ozonation alone. The higher TOC removal rate and higher reactivity of hydroxyl radical may be the main reasons for the further control of HAAsFP by the catalytic ozonation with supported FeOOH. The effects of bromide concentration, ozone dosage and contact time on the HAAsFP after catalytic ozonation were investigated. The catalytic ozonation shows a significant advantage over ozonation alone in control- ling HAAsFP under different conditions. High bromide concentration results in the predominance of bro- minated HAAs, and more significant reduction of HAAsFP after catalytic ozonation with supported Fe00H is observed at bromide concentration of 1 mg/L. Furthermore, HAAsFP of filtered water after catalytic ozonation with supported FeOOH are gradually decreased with increasing ozone dosage and extending the contact time.