| 水中典型内分泌干扰物质的臭氧氧化研究 |
| 摘要点击 2099 全文点击 1300 投稿时间：2006-08-11 修订日期：2006-10-17 |
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| 中文关键词 内分泌干扰物 臭氧 反应动力学 速率常数 氧化 |
| 英文关键词 endocrine disruptors ozone reactive kinetics rate constant oxidation |
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| 中文摘要 |
| 在静态实验中，考察了臭氧投加量、HCO-3浓度和pH值对O3氧化去除水中典型内分泌干扰物（EDs）E1、E2、EE2、DES和4-n-NP的影响.结果表明，5种EDs的去除率随O3投加量的增加而增大，O3浓度达到63.6 μg/L时可去除92.0%以上的EDs，HCO-3（0～100 mg/L）的引入抑制了O3氧化，O3氧化去除EDs的能力随溶液pH值升高而大幅度提高.在中性（pH≈7.0）和碱性（pH＞10.6）条件下，O3氧化5种EDs的表观二级反应速率常数(20℃±0.5℃)分别在(1.67～3.89)×106 Ｌ·(mol·s)-1和(0.93～1.75)×109 Ｌ·(mol·s)-1范围内，表明这5种物质在水中可被O3迅速氧化去除.计算得出5种EDs的基元反应速率常数(20℃±0.5℃)，发现O3与离子态的EDs反应活性［1.21×109～3.81×109 Ｌ·(mol·s)-1］是其与分子态EDs的反应活性［7.62×105～2.55×106 Ｌ·(mol·s)-1］的103～104倍.对比不同水质本底下O3氧化去除EDs的实验发现，滤后水和江水中EDs的去除率较其在超纯水中分别降低了26.5%～50.3%和57.3%～72.0%，表明实际水体中的有机物通过竞争氧化剂，抑制了EDs的O3氧化去除. |
| 英文摘要 |
| The effects of ozone dose, bicarbonate concentration and pH on endocrine disruptors(EDs) removal, such as E1、E2、EE2、DES and 4-n-NP, were investigated through batch experiment. The results indicated that the removal rates were enhanced by increasing ozone dose, and O3 exposures of only 63.6 μg/L were calculated to achieve ≥92.0% EDs removal efficiency. The presence of bicarbonate (0～100 mg/L) inhibited EDs ozonation. Furthermore, the EDs removal rates increased significantly as pH increased. The five apparent rate constants (20℃±0.5℃) of ozone with the five EDs were in the range of (1.67～3.89)×106 Ｌ·(mol·s)-1 at neutral pH (pH≈7.0) and (0.93～1.75)×109 Ｌ·(mol·s)-1 at basic pH (pH＞10.6). It was indicated that the five EDs were removed rapidly by O3 in water. At the same time, the elementary reaction ozone rate constants (20℃±0.5℃) were calculated, and the reactivity of ozone with ionized EDs ［i.e. 1.21×109～3.81×109 Ｌ·(mol·s)-1］ was 103～104 times higher than with neutral EDs ［i.e. 7.62×105～2.55×106 Ｌ·(mol·s)-1］. The comparative test of EDs ozonation under different water quality conditions indicated that the removal rates of EDs in filtrated water and river water were reduced 26.5%～50.3% and 57.3%～72.0% respectively compared with the case using ultrapurified water as the background. It showed that organics in real water would compete with EDs for ozonation. |
