1. Toxicity intensity inhibition

Using certain methods to change the existing form of arsenic in soil, or fix it, reduce its activity, make it passivated and leave the food chain, thus reducing its mobility and bioavailability in the environment and reducing the harmful effect of pollution without changing the total amount of arsenic.

Strength inhibition technology refers to the principle of diluting, isolating, stabilizing and curing pollutants in the way of controlling arsenic toxicity. The corresponding technologies include soil-digging method, soil-turning method, biological stabilization method, physical and chemical stabilization method, solidification and vitrification method. Because arsenic still exists in soil, under the influence of natural conditions and human activities, the change of soil physical and chemical properties is easy to reactivate arsenic toxicity and cause secondary pollution.

2. Toxic capacity limitation

Various technologies are used to remove arsenic from the soil, so that the arsenic content in the soil can reach or approach the background value, and arsenic can be recovered, which can simultaneously reduce the total arsenic and its toxic activity in the soil.

Capacity limitation technology refers to avoiding the secondary pollution of direct arsenic by controlling the total amount of arsenic, mainly by changing the mobility and adsorption of arsenic, using physical, chemical and biological forces to make arsenic leave the soil, or directly adopting engineering measures to transfer arsenic contaminated soil to unpolluted new soil, thus permanently removing arsenic from the soil. The corresponding technologies include chemical leaching (or extraction), plant absorption and volatilization, synergistic effect between rhizosphere bacteria and plants, electroremediation, osmotic reaction wall electrowinning, soil replacement and so on.