Passivating agent for weakly acidic cadmium contaminated soil and application thereof
A technology of cadmium-contaminated soil and passivating agent, which is applied in the restoration, application, soil conditioning materials and other directions of polluted soil, can solve the problem of increasing cadmium content, difficult to guarantee the long-term effectiveness of passivating agent, and invariable change of extractable cadmium content. Obvious and other problems to achieve the effect of improving stability and satisfying efficient and fast repair
Active Publication Date: 2016-05-04
NANJING UNIV
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Abstract
The invention discloses a passivating agent for weakly acidic cadmium contaminated soil and application thereof. The passivating agent is compounded and mixed from modified biological carbon, and mineral materials including calcium oxide, a calcium magnesium phosphate fertilizer and a silicon fertilizer beneficial to the soil. The passivating agent is applied to the surface of the weakly acidic cadmium contaminated farmland soil, and the application amount of passivating agent is controlled at more than 1.5 wt% of the soil; and then soil and passivating agent rotary tillage is carried out on a plough layer 20cm above the land surface, and the maximum field water holding capacity is maintained at more than 70% stably for more than ten days to complete the in situ remediation of the weakly acidic cadmium contaminated soil. The passivating agent can effectively reduce the content of available cadmium in soil, restore agricultural function of the polluted land, and ensure food security; the passivating agent contains a lot of organic matters and other nutrients, can provide abundant nutrition for the growth of crops, and has the advantages of environment-friendliness, high repair rate, long-term stability, and high application value.
Application Domain
Other chemical processesContaminated soil reclamation +3
Technology Topic
Contaminated soilsEnvironmental chemistry +16
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