Heavy metal-polluted saline land modifier by using waste white clay and saline land improvement method

Abstract

The invention provides a heavy metal-polluted saline land modifier by using waste white clay and a saline land improvement method. The modifier comprises the following raw materials: 65-80% of waste white clay, 0.5-2% of composite microbe inocula, 2-5% of chitosan, 8-15% of fly ash, 6-8% of calcium polysulfide, and 2-6.5% of acetic acid slag; and the composite microbe inocula is a mixture of bacillus subtilis, bacillus licheniformis, bacillus laterosporus, streptomyces jingyangensis and bacillus mucilaginosus according to volume ratio of a nutrient solution at 1: 1.2-1.6: 0.5-0.7: 1.2-1.5: 0.6-0.9. The modifier and an improvement method can effectively realize the improvement of the saline land, especially the heavy metal-polluted saline land, treatment requirement of the saline land can be radically solved, the cost is low, re-utilization of the resource is realized, and the environment pollution is reduced.

Description

technical field [0001] The invention belongs to the field of soil improvement, and in particular relates to a heavy metal-polluted saline-alkali soil improver and an improvement method. Background technique [0002] Soil salinization has a relatively large damage to the physical and chemical properties of the soil, which is extremely unfavorable to the growth of many crops, and it is easy to cause the lack of seedlings or death of crops, thus hindering the development of agricultural economy. Due to the high salt content, low organic mass, and high pH in saline-alkali land, the soil humus is leached and the soil structure is damaged. It is sticky when wet and hard when dry. There are often white salt deposits on the soil surface, and poor ventilation and water permeability. Severe cases can cause plant wilting, poisoning and root rot to die. In addition, if the soil is too alkaline, it will affect the availability of nutrients such as phosphorus, iron, manganese, boron, and...

AI Technical Summary

Problems solved by technology

The patented formula is complex, inconvenient to produce, a large amount of nutrients needed for microbial growth are added, and the cost is high, and in the hardened environment of saline-alkali land, the growth and reproduction of microorganisms are limited, and the treatment effect is not good

[0006] Compared with ordinary saline-alkali land, the improvement and treatment of heavy metal-polluted saline-alkali land is more difficult. First, pollutants have poor mobility in the soil, long residence time, cannot be naturally degraded, diluted, and flow, and will become more and more enriched in saline-alkali land as time goes on. , harmful to plants grown in saline-alkali land; second, due to the high salt content and alkaline nature, the survival rate of plants is very low, and natural improvement is extremely slow

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