摘要
以4,4＇-二溴联苯（4,4-＇DBB）为代表性有机物,对比研究了单独O3和O3/H2O2处理持久性有机污染物的效能,并通过UV254值表征溶液的TOC、DOC值.结果发现,2种方法都可以达到一定的去除效果,尤其是碱性条件下H2O2的加入使去除率得到进一步提高.4 mg/L的4,4-＇DBB溶液反应270 min后,最终去除率达到78.0%,UV254值变化率与去除率基本吻合,最终在76.9%-77.8%之间,矿化程度明显.高低2种浓度比较发现,加相同氧化剂的量,反应相同时间,去除率随溶液初始浓度增高而降低,但浓度越高的溶液的绝对处理量越大.4,4-＇DBB的反应符合动力学拟一级反应规律,计算增强因子f为1.54.
A comparative study of O3 alone and O3/H2O2 was made to evaluate their respective eftectiveness for removal of persistent organic pollutants （POPs） from water with 4, 4＇-dibro minated hiphenyl （4, 4＇-DBB） as the model pollutant, and UV254 was used as the surrogate parameter for TOC and DOC. It was found that both processes enhanced the removal rate. Especially, it has been made a further enhancement of the removal of 4, 4＇-DBB as H2O2 was added under the alkaline-condition. The final removal rate of 4 mg/L 4, 4＇-DBB solution reached 78.0% after reacting for 270 nlin, while the UV254 vahle varies with the removal rate and reached 76.9% - 77.8% ultimately. It means that the total organic carbon has been removed obviously. Two kinds of solution of different concentration with the same amount of oxidant reacting for the same tittle have been compared with each other and the results showed that the higher the initial concentration was, the smaller the removal rate was, however, the more the absolute amount could be removed. It was also found that 4, 4＇-DBB＇s removal followed pseudo-first order reaction and the promoted factor f for 4, 4＇-DBB removal rate constant was about 1.54.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第9期1998-2003,共6页
Environmental Science
关键词
4
4'-二溴联苯
臭氧
过氧化氢
动力学
4, 4＇-dibro minated biphenyl
ozone
hydrogen peroxide
kinetics
