Method and device for combined remediation of soil cadmium/chromium micro-pollution in rice planting process

The invention discloses a method and device for combined remediation of soil cadmium/chromium micro-pollution in the rice planting process, and the method and device are coupled with dry-wet alternate moisture management, polarity exchange electric field, citric acid synergistic electrokinetic remediation and phytoremediation technologies, and the method comprises the following steps that field soil is pre-acidified with a citric acid solution; a first electrode plate and a second electrode plate are vertically inserted into rice field soil, an enrichment plant is planted between the two electrode plates, and the polarities of the first electrode plate and the second electrode plate are repeatedly exchanged according to trigger conditions. The device comprises a solar power supply system, a chemical-electric-plant combined remediation module and a soil moisture content and pH value sensor. According to the method, directed migration and directed enrichment of exchangeable Cd/Cr are realized under the action o