Abstract:

The removing effectiveness of U(Ⅵ) in U(Ⅵ)-bearing wastewater by nano zero-valent iron has been studied.The effects of the dosage of nano zero-valent iron,pH and competitive ions on treatment effiency are investigated.The results indicate that the U(Ⅵ) removing rate is 99%,when the pH of simulated U(Ⅵ)-bearing wastewater is 5.The common cations have no evident influence on U(Ⅵ) removing rate,while bivalent anions,such as SO₄^2-,CO₃^2-,do.Under the same conditions,the removing efficiency of nano zero-valent iron is remarkably better than common iron powder,and the deoxidizing velocity is 15 times higher than that of common iron powder.

Key words: zero-valent iron, wastewater treatment, U(Ⅵ)

摘要：

研究了纳米级零价铁对废水中铀(Ⅵ)的去除效果,考察了纳米级零价铁投加量、pH及竞争离子等因素对处理效果的影响。结果表明,当模拟含铀(Ⅵ)废水的pH=5时,铀去除率达到99%。常见的阳离子对铀去除率没有明显影响,但二价阴离子SO₄^2-、CO₃^2-对铀去除率的影响显著。在相同条件下,纳米铁对铀(Ⅵ)的去除效果明显优于普通铁粉,还原速率比普通铁粉提高了15倍。

关键词: 零价铁, 废水处理, 铀(Ⅵ)

CLC Number: 

• X703