表面活性剂强化原位空气扰动修复实验研究——影响区域及气流分布变化规律

应用一种改进的二维气流可视化装置来研究影响区域（ZOI）内不同介质（粗砂和砾石）和表面活性剂（SDBS）的添加对影响区域以及气流分布规律的影响.结果表明：相同曝气流量下，同种介质中表面活性剂的投加会增大曝气压力.表面活性剂的添加极大地提高了空气饱和度，但在不同介质中作用机理不同.当曝气流量为1000 L/h时，表面活性剂的添加使得粗砂介质（孔道流）和砾石介质（鼓泡流）ZOI的面积分别增大了21.8%和5.2%.这说明在一定粒径范围内，介质粒径越细，表面活性剂的添加对ZOI面积的增加越明显.相同曝气流量下，表面活性剂的添加使粗砂介质中气流分布范围变大且气流分布曲线相对平缓，而砾石介质中气流分布范围不变且气流分布曲线相对陡峭；不同曝气流量下ZOI内气流分布表现出明显的相似性.

Laboratory study of surfactant-enhanced air sparging remediation-The variation rule of the influence of zone and airflow distribution

An improved two-dimensional visualization device was used to study the zone of influence (ZOI) and the airflow distribution when the surfactant (SDBS) was added to the aquifer. The experimental results indicated that the addition of surfactant would increase the sparging pressure in the same media under the same airflow rate. The addition of surfactant greatly improved the air saturation, however, the mechanism was different under different medium. When airflow rate was 1000L/h, the sparging area of coarse sand (channel flow) and gravel (bubbly flow) increased 21.8% and 5.2% respectively by adding the surfactant to the aquifer. This showed that the smaller medium size was, the more obvious sprging area increased. Under same airflow rate, the airflow distribution range of coarse media became larger and the airflow distribution curve was relatively flat gently, while the airflow distribution range of gravel media was little changed and the airflow distribution curve was relatively abrupt when SDBS was added in the aquifer. Under different airflow rate, the airflow distribution showed significantly similar rule within the ZOI.