Passivation improver for heavy metal pollution farmland and using method thereof

Abstract

The invention provides a passivation improver for a heavy metal pollution farmland and a using method of the passivation improver. The raw materials comprise coal ash, nano iron powder, zeolite, medical stone, calcium magnesium phosphate, hydroxypropyl modified SiO2 / chitosan nanoparticles and porous spherical cellulose. According to the composite passivation improver, the passivation effect on heavy metals cadmium, lead, arsenic and chromium in soil can be improved, copper and zinc in soil are well passivated, and the soil remediation effect is improved.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal passivation, in particular to a passivation improver for heavy metal polluted farmland and a use method thereof. Background technique [0002] The agricultural resource environment is not only an important material basis for agricultural production, but also directly related to the quality and safety of agricultural products, affecting human health, related to the frequency and intensity of agricultural disasters, and plays a decisive role in the sustainable development of agriculture and rural economy. role. With the aggravation of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, heavy metals discharged from industry, agriculture, and life continue to increase, and soil heavy metal pollution is becoming more and more serious. Heavy metals are currently the main pollutants in my country's farmland. In 1980, the area of ​​polluted farm...

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Problems solved by technology

[0003] The most commonly used method at present is the passivation method. The traditional research method is to add chemical substances such as slaked lime and calcium silicate to the soil. By adding these substances, precipitation, adsorption, ion exchange, humification and oxidation will occur with heavy metal elements. A series of reactions such as reduction, and then change the occurrence of heavy metals in Xingtai, significantly reduce their bioavailability and mobility, significantly slow down the toxic effect of heavy metal pollution on plant growth, and greatly reduce the absorption and accumulation of heavy metals by plants. However, most of these substances It is an inorganic substance, which affects the physical and chemical properties and fertility of the soil, affects the growth environment of microorganisms to varying degrees, and also affects the availability of the soil after the restoration is completed. Therefore, it is necessary to further search and study the in-situ restoration of heavy metal pollution that is friendly to the soil environment. Materials, traditional organic passivators have both the functions of passivating heavy metals and improving the physical and chemical properties of soil, but they are easy to decompose and the passivation effect is not long-term. The key point of passivation repair technology is to screen out the effective High-efficiency heavy metal passivation agent with application value, the applicant has developed a passivation improver for heavy metal remediation in soil, which is formed by mixing fly ash, iron powder, zeolite and calcium magnesium phosphate fertilizer. It has a good passivation effect on the heavy metals cadmium, lead, arsenic and chromium in the soil, but the passivation effect on copper and zinc is poor. The present invention further improves on the basis of this technology, by further adding three improved components , to further improve the passivation effect on heavy metals cadmium, lead, arsenic and chromium in the soil, and at the same time have a good passivation effect on copper and zinc in the soil, and improve the effect of soil restoration

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