释氧渗透反应格栅填料的改进研究

Improving Property of Filler in Oxygen-releasing Permeable Reactive Barrier

释氧材料的性能是释氧格栅能否经济有效地应用到地下水原位修复中的关键因素。作者在前人研究的基础上,通过在一般的释氧材料中加入膨润土而使释氧材料的性能得到明显的改善。这种释氧材料释氧速率平缓,释氧时间长,总释氧量大,是一种能有效应用到释氧格栅中的改进释氧材料。实验数据表明,在天然地下水的作用下,该材料持续释氧约1a后,水中的溶解氧还能保持在15mg/L左右;把本材料引入地下水中不会显著改变地下水环境的pH值,天然含水层介质能把pH值缓冲到一个中性的环境。

The study is intended for improving property of oxygen-releasing materials used in situ polluted groundwater remediation, focusing on preparing ideal filler containing ORC （oxygen releasing compounds） in permeable reactive barrier. Bentonite is added into CaO2, the oxygen releasing source, to upgrade ORC＇s property characterized with a lengthened O2 releasing duration, decreased O2-release dropping rate and increased gross O2 releasing amount. The batch and continuous column experiments conducted also suggest that the new O2 releasing material does not change pH of the groundwater so much and the natural aquifer can buffer pH to a neutral condition.