Heavy metal polluted soil repairing agent with high content of biocarbon and humus and application method thereof

Abstract

The invention discloses a heavy metal polluted soil repairing agent with a high content of biocarbon and humus, and an application method thereof. The repairing agent is composed one or more of kitchen garbage, blue algae, livestock and poultry manure, straw, wood chip, rice husk, plant wastes, dead animal due to diseases and residual body of livestock and poultry. The raw materials mentioned above is subjected to steps of impurity removing, grinding, and proportioning, and then the mixture is subjected to a sub-critical water treatment for 90 to 150 minutes at a temperature of 180 to 360 DEG C under a pressure of 1.8 to 5.8 MPa so as to obtain the tail product; wherein the biocarbon content accounts for not less than 45% of the dry substrate, the total nutrient content is 4 to 6%, the amino acid content is not less than 20%, the humus content is not less than 40%, the trace element content is not less than 0.5%, and the pH value of the repairing agent is 5 to 7. The provided repairing agent can be used to repair polluted soil, and can also be used to treat the soil secondary salinization and hardened soil caused by over application of chemical fertilizer and pesticides. The organic solid waste pollutants are processed to produce the repairing agent, thus the environment pollution problem is solved, and at the same time, the biocarbon and humus in the tail product can repair and improve the soil polluted by metals, chemical fertilizers, and pesticides.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to a heavy metal-polluted soil remediation agent containing high biological carbon and humus, which is used for remediating soil polluted by heavy metals, chemical fertilizers and pesticides, and an application method thereof. Background technique [0002] At present, my country's planting soil is increasingly polluted by heavy metals, chemical fertilizers, and pesticides. The total area of ​​pollution has exceeded one-fifth of the total area that can be planted. The relevant local governments, agricultural authorities, environmental protection departments, and food safety departments are under great pressure. However, due to technical bottlenecks, there is no good solution; [0003] Agricultural production and the consumption of its products produce a large amount of urban and rural organic waste, such as kitchen waste, livestock and poultry manure, crop straw, blue-green alg...

AI Technical Summary

Problems solved by technology

However, the acquisition and use of biochar and humus currently encounter comprehensive bottlenecks such as high cost, high environmental cost, and inconvenient use.

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