Soil remediation agent capable of passivating heavy metals in soil and preparation method for soil remediation agent

Abstract

The invention discloses a soil remediation agent capable of passivating heavy metals in soil and a preparation method for the soil remediation agent. According to the soil remediation agent and the preparation method therefor, the soil remediation agent with an efficient remediation action on the heavy metals in the soil is obtained through blending biochar, bentonite and magnesium oxide accordingto a specific dosage ratio, the three ingredients have a synergistic passivating effect on the heavy metals in the soil through being combined together at the specific ratio, particularly, the effective-state content of heavy-metal cadmium in the soil can be efficiently lowered, and the content of effective-state cadmium can be lowered by 55% to 60% in one month. Through remedying heavy-metal contaminated soil by employing the soil remediation agent disclosed by the invention, the soil remediation agent has the advantages that the remediation cost is low, the operation is simple, the maintenance is convenient, and the like.

Description

technical field [0001] The invention relates to a soil remediation agent for repairing soil, in particular to a soil remediation agent for passivating heavy metals in soil and a preparation method thereof, which belongs to the field of remediation of heavy metal polluted soil. Background technique [0002] In soil pollution, heavy metal pollution has become a global environmental problem due to its latent, hidden, long-term and irreversible nature, among which cadmium is one of the most toxic heavy metal elements. The extensive use of cadmium-containing fertilizers and pesticides in agricultural production and the use of industrial sewage for irrigation have caused serious problems of cadmium pollution in farmland soil. According to incomplete statistics, the area of ​​farmland polluted by cadmium in my country has exceeded 20×10 4 hm 2 , the annual production of agricultural products with cadmium content exceeding the standard reaches 14.6×10 8 kg. The "cadmium rice" in...

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Problems solved by technology

However, due to some biological factors, such as the limited growth range of plant roots and the susceptibility of animal growth to environmental and other factors, bioremediation also has certain limitations.

[0004] Existing remediation agents for passivating heavy metal cadmium in soil have problems such as long repair period, long effective time, and low passivation rate to varying degrees, which need to be improved

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