Remediation agent for remediating heavy metal cadmium and lead compound polluted soil and preparation method thereof

Abstract

The invention discloses a remediation agent for remediating heavy metal cadmium and lead compound polluted soil and a preparation method thereof. The remediation agent is prepared from the following components in percentage by weight: 5 percent to 8 percent of fulvic acid, 4 percent to 7 percent of peanut dregs, 7 percent to 12 percent of bitter herb dregs, 42 percent to 48 percent of modified sepiolite, and 26 percent to 32 percent of dolomite, wherein the powder fineness of the soil remediation agent is 50 to 80 meshes; a pH value of the soil remediation agent is 11 to 12; and the fulvic acid in the soil remediation agent contains multiple functional groups such as hydroxy, carboxyl and sulfydryl, and is bonded with soil heavy mental ions to form a slightly soluble substance, so that aneffective-state heavy metal in the soil is changed into a residual state, and the migration of heavy metal is inhibited. By adding the peanut dregs and the bitter herb dregs, the activity of gram positive bacteria and pseudomonadaceae phosphate solubilizing bacteria in the soil can be improved, slightly soluble phosphorite in the soil can be dissolved through low molecular organic acids such as lactic acid, amino acid, oxalic acid, fumaric acid and citric acid secreted by the bacteria, phosphate radical in the soil can be released, and the quality and the yield of agricultural products are improved.

Description

technical field [0001] The invention relates to the technical field of agricultural environmental protection and restoration, in particular to a restoration agent for treating heavy metal cadmium and lead compound polluted soil and a preparation method thereof. Background technique [0002] With the advancement of urban industrialization, the mining and application of heavy metals and human activities have caused many heavy metals such as lead, cadmium, and mercury to enter the global ecosystem, and the soil is facing severe environmental pollution. At present, the situation of heavy metal pollution in farmland soil in my country is becoming increasingly serious. According to the report of the State Environmental Protection Administration, the area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, and lead in my country is nearly 20 million hectares, accounting for about 20% of the total cultivated land area in the country. The pollution situation of he...

AI Technical Summary

Problems solved by technology

In view of the limitations of the above method, it has not been widely applied

Images