NEWS

In situ chemical oxidation/reduction remediation technology is to inject oxidant or reducing agent into contaminated areas of soil or groundwater, through oxidation or reduction, so that pollutants in soil or groundwater into non-toxic or relatively less toxic substances. However, in the process of remediation, the change of pollutant concentration, intermediate products, as well as the influence range and underground movement path of the agent are of great significance to the remediation effect.

In the process of monitoring the diffusion and repair effect of injection agents in the traditional way, water samples, laboratory testing, layout, sample testing and other steps are taken, which not only has a long cycle, but also has many limitations in the sampling and monitoring of fixed points, including the single point of information and the uncertainty of depth information caused by the sampling method. In this experiment, the cross-hole high-density electrical method (a geophysical method) was used to conduct real-time imaging of underground resistivity distribution, and continuous online monitoring was carried out during the period of agent perfusion and reaction. In addition, the change of resistivity before and after agent perfusion in the block was compared to monitor, so as to infer the diffusion seepage flow diameter, diffusion rate and range of agent.