Soil heavy metal pollution repairing agent, and preparation method and application thereof

Abstract

The invention discloses a soil heavy metal pollution repairing agent, and a preparation method and application thereof. The soil heavy metal pollution repairing agent comprises the following components in parts by weight: 40-60 parts of treated biochar, 5-10 parts of marlstone, 10-15 parts of dolomite, 3-7 parts of zeolite, 10-20 parts of treated waste sulfuric acid, 2-5 parts of thiourea, 3-5 parts of ferrous sulfate and 0.5-2 parts of thiobacillus. The repairing agent utilizes the waste sulfuric acid, is environmentally friendly and economical, and can obviously reduce the content of heavy metals and organic pollutants in soil or water; generate secondary pollution is avoided; the soil hardening phenomenon is avoided; soil quality is effectively improved; and the usage amounts of chemical fertilizers and pesticides are reduced. The repairing agent also has the advantages of simple operation flow, short period and quick response.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a soil heavy metal pollution remediation agent and its preparation method and application. Background technique [0002] With the growth of population and the acceleration of industrialization, the pollution of industrial wastes, chemical fertilizers and pesticides is becoming more and more serious, and the quality of farmland soil is degrading day by day. Soil pollution has become one of the main problems that endanger the quality of the global environment and the survival and development of human beings. According to the survey results of soil pollution in my country, the rate of over-standard soil points in cultivated land is close to 20%, and more than 80% of the over-standard points are heavy metals. Soil heavy metal pollution has aroused the concern and attention of the whole society. [0003] Heavy metal pollution refers to environmental pollution cau...

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Problems solved by technology

[0005] 1. Engineering measures such as alien soil method, soil replacement method, deep plowing method, solidification and stabilization method, electrodynamic repair method, etc. have the advantages of stability and quick results, but there are large engineering quantities, high investment costs, and secondary pollution Not suitable for the treatment of large-scale polluted soil

2. The leaching method and the application of modifiers can reduce the toxicity and bioavailability of heavy metals in the soil in a short period of time. Because the artificial application of chemical agents to the soil can easily cause secondary pollution, and this method is an in-situ Restoration method, the heavy metal Cd still remains in the soil, it is easy to reactivate and harm plants, and its potential threat has not been eliminated

But at present, most microbial remediation technologies are still limited to scientific research and laboratory level, and there are not many case studies, so they cannot be widely promoted

5. The use of some lower animals in the soil, such as earthworms, to remediate heavy metal cd pollution is still limited to the laboratory stage, and due to factors such as the growth environment of lower animals, the remediation efficiency is average, which is not an ideal method. repair technology

However, the biomass is small, the enrichment coefficient is low, the remediation efficiency is poor, and there are few studies on the harmless treatment of remediation plants.