Secondary modification repairing agent after treatment of heavily-polluted soil

Abstract

The invention discloses a secondary modification repairing agent after treatment of heavily-polluted soil. The secondary modification repairing agent comprises the following raw materials in parts by weight: 8-10 parts of pulverized fuel ash, 28-30 parts of furfural residue, 13-14 parts of wheat bran, 3.6-3.8 parts of potash feldspar powder, 3-4 parts of ammonium sulfate nitrate, 1.7-1.8 parts of sodium selenite, 56-58 parts of polluted pen manure, 22-24 parts of papermaking black liquor, 3.8-4.2 parts of a nitric acid solution with concentration being 10%, 15-17 parts of alum slurry, and a proper amount of water. The repairing agent employs combination of alum slurry and an organic material for performing adsorption treatment on residual noxious substrates in the soil, the polluted pen manure is used to repair the soil structure and soil pores, unit weight is reduced, permeability is increased, compounding usage of organic substrates such as furfural residue, wheat bran and potash feldspar powder and ammonium sulfate nitrate provides help for enhancing soil nutrients, and reutilization of the polluted soil can be realized.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a remediation agent for secondary improvement after treatment of heavily polluted soil. Background technique [0002] Soil improvement is aimed at the poor texture and structure of the soil, and corresponding measures are taken to improve soil properties and soil fertility. Soil improvement and restoration agent is an important application of soil improvement. However, the soil remediation and improvement agents currently on the market have many defects: one is that the raw materials used contain artificially synthesized polymer compounds, which are not easy to decompose in the soil and remain for a long time, which has potential safety hazards; Soils, such as acidic and alkaline soils, have no effective targets for heavy metal pollution and nutrient deficiencies, resulting in low efficiency of improvement and restoration, or even counterproductive effects; third, the lo...

AI Technical Summary

Problems solved by technology

However, the soil remediation and improvement agents currently on the market have many defects: one is that the raw materials used contain artificially synthesized polymer compounds, which are not easy to decompose in the soil and remain for a long time, which has potential safety hazards; Soils, such as acidic and alkaline soils, have no effective targets for heavy metal pollution and lack of nutrients, resulting in low efficiency of improvement and restoration, or even counterproductive effects; third, the cycle of soil improvement is long and the cost is high, so it cannot be applied on a large scale

[0004] As a renewable biological resource with a wide range of sources and low cost, pig manure has great potential as a raw material for soil improvement and restoration because it is rich in organic matter and nutrients such as nitrogen, phosphorus, and potassium. The feed contains a large amount of additives during the process, resulting in excessive heavy metals and indirectly polluting the excrement