A study of the influencing factors of air sparing remediation to chlorobenzene in groundwater

A one-dimensional column was installed to study chlorobenzene removal effect on groundwater with different influencing factors,including medium permeability,air injection mode,coexisting contaminant and residual saturated chlorobenzene.The results show that medium permeability greatly affects AS remediation efficiency.The bigger the hydraulic conductivity is,the better the removal efficiency is.It is difficult to use AS in medium with hydraulic conductivity of less than 10-5m/s.In the same operating time,pulsed air injection has advantages over continuous air injection for medium sand with hydraulic conductivity of 5.1×10-4m/s,while the effects of two air injection modes are similar for coarse sand with hydraulic conductivity of 6.2×10-3m/s.There is synergistic effect of co-contaminant benzene and chlorobenzene on the removal efficiency.There is a clear tailing effect when AS remediates residual saturated chlorobenzene.