Soil legislation is still blank 【Technical】 Treatment of heavy metals in groundwater

Under natural conditions, the heavy metals in groundwater mainly come from the mother rock and residual biological substances, and the content is generally low, which will not cause harm to human beings and ecosystems. With the rapid development of industry and the sharp increase of human activities, the Chemical Industry and Chemical Products such as Cr, Cd, Ni, Pb, Hg and other heavy metals produced by mining, mineral processing, metallurgy, electroplating, Chemical industry and leather industry are discharged. Major environmental pollution events such as paper making and electronics industry not only cause serious pollution to surface water, but also cause a large amount of heavy metals to accumulate in the soil, and the heavy metals accumulated in the soil enter the underground water body through leaching, thus causing harm to human beings and irreversible heavy metal pollution to groundwater.

At present, there are two main ways to control heavy metals in groundwater: one is to change the existence form of heavy metals in groundwater and soil, make them fixed, and reduce their environmental mobility and bioavailability; Another is to remove heavy metals from groundwater and soil. The current treatment technology has its limitations: high cost and poor treatment effect; The natural purification of heavy metals by microorganisms is slow and limited by the type of pollution. Chemical fixes may produce more toxic byproducts.