Leaching solution for heavy metal contaminated soil, preparation method thereof, and leaching device

Abstract

The invention discloses a preparation method of a leaching solution for heavy metal contaminated soil. The preparation method comprises the following steps: dropwise adding a ferrous sulfate solution into a sodium polyacrylate solution, uniformly stirring, and dropwise adding a sodium sulfide solution into the mixed solution to generate the sodium polyacrylate dispersed nano ferrous sulfide leaching solution. The invention further discloses the leaching solution for the heavy metal contaminated soil. The leaching solution is prepared through the preparation method. The invention further discloses a leaching device for the heavy metal contaminated soil. The leaching device comprises a leaching solution preparation unit, a spraying unit, a tank body, a porous barrier plate unit and an adsorption unit, and the leaching solution preparation unit is used for preparing the leaching solution. According to the leaching solution for the heavy metal contaminated soil, the preparation method of the leaching solution, and the leaching device, the process is simple, and mixed pollution of various heavy metals in the soil and secondary pollution possibly caused by the leaching solution can be reduced.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a leaching liquid for heavy metal-contaminated soil, a preparation method thereof, and a rinsing device. Background technique [0002] Soil leaching is a process of spraying or infiltrating the eluent into the soil so that it flows through the soil layer to be repaired, decomposing or fixing the pollutants in the soil, and then concentrating and reusing the flushing solution containing the pollutants. The principle of soil leaching is that effective substances in the eluent combine with heavy metals in the soil through complexation or form dissolved heavy metal ions. Generally, the heavy metal ions in the soil are transferred to the eluent, which can reduce the amount of soil treatment and realize the transfer from solid phase to liquid phase. The efficient fixation of heavy metal ions in soil can be achieved by selecting different eluents, reducing the risk o...

AI Technical Summary

Problems solved by technology

However, the process of soil leaching is relatively complicated at present, and the eluent generally selected is acidic liquid, mainly because heavy metals are easily soluble in acidic liquid, but the introduction of acidic liquid may cause great changes in soil physical and chemical properties and microbial community results , thereby destroying the original ecological balance of the soil; at the same time, the leaching of acidic substances may cause secondary pollution

Images