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| Pilot test on radius of influence for air sparging——taking a coking plant in Beijing as a case study |
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Abstract A pilot test scheme, which consists of 1 injection well, 3 groundwater monitoring wells and 5 soil gas monitoring wells, was designed and installed in a Beijing coke plant. Injection pressure and flow rate test, groundwater response test, dissolved oxygen test, helium tracing test and soil gas test were carried out for determining the optimum injection pressure and flow rate and radius of influence (ROI) of the air sparging system. The injection pressure and flow rate test shows that 0.03MPa, 23.2 m3/h are the optimum injection pressure and flow rate. Under the suggested optimum injection pressure and flow rate, water tables in groundwater monitoring well G3、G5、G8 rose up to 0.36、0.11、0.04m in 10、15、15min, respectively, and DO rose up to 7.35、2.47、0.74mg/L in 60、65、75min, respectively, suggesting that response was obvious in G3 and G5, not G8. The highest helium concentration was 83%、13%、41% in S2、S4、S5 at 10、7、6min, and none in S6; the oxygen concentration was 19.9%、19.6%、19.2%、19.0%、16.6% in S2、S3、S4、S5、S6, respectively, suggesting that injection air has relatively significant influence on S2-S5. The ROI in the test area is suggested to be 5m based on the comprehensive analysis of the above results.
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Received: 06 November 2011
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