Heavy metal passivator and application thereof

Abstract

The invention discloses a heavy metal passivator. The heavy metal passivator comprises the following components in parts by mass: 56-77 parts of straw, 15-33 parts of biological charcoal and 6-18 parts of biological humic acid. The heavy metal passivator consists of the straw, the biological charcoal and the biological humic acid, all of which have the effects of improving the quality of compost and improving soil, so that compared with the existing chemical passivator, physical passivator and the like, the heavy metal passivator can improve the soil quality and protect the soil environment better. The heavy metal passivator is used for passivating heavy metals in livestock and poultry manure in the composting process, and passivated compost is applied to the soil so as to further passivate heavy metals in the soil, so that establishment of a fertilizer-soil heavy metal hindering control system is facilitated.

Description

technical field [0001] The invention relates to a heavy metal passivator and an application thereof, belonging to the technical field of soil fertilizers. Background technique [0002] Statistical analysis of some heavy metal content in farmland soil in 8 regions of my country showed that the heavy metal content in most areas was higher than the background value of the soil environment. For 24 provinces and cities across the country, 320 seriously polluted areas, about 548×10 4 hm 2 The land survey shows that excessive heavy metals in agricultural products is the main problem of excessive pollutants in agricultural products. In 2006, my country carried out sampling tests on farmland protection areas, and the excess rate of heavy metals in the sampling samples was as high as 12.1%. The analysis results of soil samples in Beijing (2005-2009) for five consecutive years showed that the soil was polluted by Cd, Pb and Hg to varying degrees. In agricultural activities, livesto...

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Problems solved by technology

Physical adsorbents are easier to obtain, the mechanism of passivating heavy metals is relatively simple, and the operability is strong. The disadvantage is that it is difficult to separate the adsorbent from the compost product, and the passivation effect on heavy metals is not high.

The passivation effect of chemical passivators is better, but the chemical passivators themselves often pollute the environment. Therefore, chemical passivators have secondary pollution risks

[0005] On the one hand, the passivation effect of the biological passivation agent may be due to the addition of some microbial agents that affect the microbial activity in the material and increase the enrichment of heavy metal ions by microorganisms; on the other hand, it may be due to the enhancement of microbial activity, stronger microorganisms Metabolism produces a large amount of humic acid macromolecules, transforms heavy metal ions into forms that are not easily absorbed by plants or accumulates in microorganisms, reducing their mobility

At present, the research on the types of biological passivators and the passivation mechanism is still insufficient, and further exploration and improvement are still needed

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