地下水曝气工程技术研究——以德州胜利油田地下水石油污染治理为例

为了研究地下水石油污染现场曝气治理效果,在胜利油田石油开采区进行了地下水现场曝气治理技术研究。采用溶解氧浓度法研究了曝气操作条件(曝气深度、曝气压力和曝气流量)对地下水石油污染曝气治理技术的影响。实验结果表明:在相同曝气压力和流量下,曝气深度越大,影响半径越大,但影响区内的气流分布越稀疏;相反,曝气深度越小,则曝气影响半径越小,但在影响区内空气流线分布越密。气流分布密度和曝气影响半径随曝气压力和流量增大而增大,但存在一个最佳限值;现场曝气存在气流分布不对称现象,是由于土壤介质的渗透性不均匀所致。地下水曝气技术对地下水石油污染治理效果显著,但曝气操作条件对该技术影响较大,需根据地质条件通过现场曝气试验确定。

Study on the groundwater air sparging in engineering technique

In order to study groundwater petroleum contamination remediation effect by field air sparging(AS),the AS engineering technique was carried out in Shengli Oil Field.The dissolved oxygen concentration method was adopted to study the influence of AS running parameters on the remediation effect,which includes well depth,pressure and airflow rate.The result shows that with the same AS pressure and airflow rate,the greater the AS well depth,the greater the radius of influence(ROI),but the air distribution concentration is thinner in the influence zone.On the contrary,the smaller the AS well depth,the smaller the ROI,but the air distribution concentration is thicker in the influence zone,and the dissolved oxygen concentration is higher.The concentration of air distribution and the ROI will increase with the AS pressure and airflow rate increasing,but there exists an optimal value.The reason of air distribution being asymmetric is that the penetrability of the field soil is not uniform.The AS technique is effective to the groundwater petroleum contamination remediation,but the running parameters have a great influence on the AS technique,which needs to be decided by the field AS experimentation.