In-situ remediation passivator for cadmium-copper contaminated rice field soil and preparation and use methods thereof

Abstract

The invention provides an in-situ remediation passivator for cadmium-copper contaminated rice field soil and a preparation and use method of the in-situ remediation passivator. The passivator is prepared from, by mass, 15%-25% of calcium carbonate, 55%-65% of humus and 15%-25% of calcium magnesium phosphate fertilizer. The preparation method of the passivating agent is simple, the passivating agent is obtained only by smashing, grinding, screening and mixing the raw materials, the preparation process is simple, the repairing technology is original repairing, and ectopic treatment is not needed; the method can be used for repairing the rice field soil polluted by cadmium and copper at the same time, and also can be used for repairing the rice field soil only polluted by cadmium or repairing the rice field soil only polluted by copper; the remediation method is simple, the remediation method only needs to be applied to the rice field in a manual or mechanical mode in the slack season and ploughed through a rotary cultivator, field management after crop planting is the same as daily field management, agricultural planting is not affected, the remediation effect is obvious, and the remediation method has the persistent effect and is suitable for large-area popularization.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to an in-situ remediation passivator for cadmium-copper-contaminated paddy field soil and a preparation and use method. Background technique [0002] Soil heavy metal pollution has the characteristics of strong concealment, long-term, irreversible, and high toxicity, and is considered to be one of the most serious environmental problems in the world. According to the National Soil Pollution Survey Bulletin conducted by the State Environmental Protection Administration of China in 2014, my country's polluted land involves 25 regions in 11 provinces, and the quality of the soil environment is deteriorating day by day, and the pollution phenomenon is prominent. From the perspective of pollutant types exceeding the standard, the exceeding standard of many heavy metal pollutants is in a severe state, and the excessive rate of heavy metal cadmium and copper pollutant...

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Problems solved by technology

[0004] At present, the use of passivators mainly has the following problems: pure chemical passivation restoration technology is often affected by the interaction of multiple factors such as material type-combination method-soil, and different chemical passivators in soil with complex coexisting ions, due to their performance The differences in passivation will show different passivation repair effects; limited by the region and research conditions, the current research is mainly focused on the role of specific passivators in soils in specific environments, which lacks universality; the types and physical and chemical properties of heavy metal-contaminated soils There are large differences, and the ability of chemical passivators to regulate soil fertility is limited

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