Persulfate is the newest oxidant that is being used for in the remediation of soil and groundwater.
The rapid development of economy has had a great impact on land.
In terms of agricultural production, the residues of agricultural production cannot be decomposed in the land, as well as pesticide residues; In terms of industrial production, such as the indiscriminate dumping of industrial waste; In the aspect of mining, for example, soil layer and soil structure are destroyed by mining, resulting in land degradation. Will cause different degrees of pollution to the land, which makes soil remediation become an urgent problem to be solved.
Currently on the organic pollutants of soil restoration approach, can be roughly divided into the three methods are physical, chemical, biological, and its principle is to transfer, absorption, degradation and transformation of organic pollutants in the soil, make its concentrations reach, within the scope of the crops can grow or directly to the pollutants into harmless substance. At present, sodium persulfate is widely used as remediation agent of organic pollutant source soil.
Activated sodium persulfate has strong oxidation ability and can quickly degrade most of the organic pollutants in the soil. Activated sodium persulfate has low damage to soil organic matter and indigenous microbial community, and can better maintain the original soil fertility.
Compared with (ferrous + hydrogen peroxide) and potassium permanganate (easy to produce drugs and explosive products under the supervision of public security), sodium persulfate has much better safety and convenience in storage and transportation.
As a new oxidation agent, activated sodium persulfate has the advantages of high stability, high water solubility, no peculiar smell, and can have a relatively strong oxidation capacity in a large pH range, can adapt to most of the scene to degrade pollutants. Activated sodium persulfate can be oxidized and degraded in the face of chlorinated organics, chlorine-containing pesticides and hard-to-degrade organics, so it has a wide range of application and can effectively repair a variety of contaminated soils.
The use method of activated sodium persulfate oxidation agent is also relatively simple, just inject activated sodium persulfate into the ground, can achieve the removal of harmful substances in the soil, compared with other soil remediation methods, activated sodium persulfate use method is relatively simple, the cost is also lower.