Research on Dynamic Gradient Multiphase Extraction Operation Mode
Multiphase extraction technology has a significant remediation effect on organic contaminated groundwater,which can improve the vacuum degree in the extraction well,promote the release of Volatile Organic Compounds(VOCs),increase the extraction amount of polluted water,and reduce the concentration of pollutants.This study proposes a dynamic gradient multiphase extraction operation mode and selects an industrial legacy plot in Shanghai city for intermediate experiments to restore the groundwater environment.The results show that after 28 d of multiphase extraction operation,the concentration of 1,2-dichlorobenzene in the dynamic gradient multiphase extraction zone decreased from 68.5 mg/L to 21.3 mg/L,and the concentration of 1,4-dichlorobenzene decreased from 33.6 mg/L to 11.4 mg/L,its pollutant removal effect was significantly better than the traditional continuous multiphase extraction mode.It can form a hydraulic gradient centered around the heavily polluted area,and increases the extraction volume of Dense Nonaqueous-Phase Liquids(DNAPLs)phase and total water pumping volume in the heavily polluted area through the pressure brought by the liquid level difference,thereby promoting groundwater remediation.
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