Composite soil passivator for reducing contents of cadmium and lead as well as preparation method and application method of composite soil passivator

Abstract

The invention discloses a composite soil passivator for reducing contents of cadmium and lead as well as a preparation method and an application method of the composite soil passivator. The composite soil passivator comprises the following components in percentage by weight: 5-15wt% of composted chicken manure, 5-15wt% of composted mixture of rice chaff and husk, 5-15wt% of turf, 10-20wt% of silicon-calcium-magnesium-potassium fertilizer, 5-15wt% of talcum powder, 25-35wt% of sepiolite, 10-20wt% of stacking fermented sugarcane filter mud and 1.5-2.5wt% of microbial fermentation liquor. The composite soil passivator can be widely applied to the mild and moderate cadmium / lead polluted rice fields to ensure that active cadmium and lead of the soil in the heavy metal polluted rice fields are respectively reduced by 51.5-51.6% and 52.6-58.8%, the cadmium and lead contents of the polished rice are respectively reduced by 48.8-51.6% and 52.7-56.0% and the pH value of the soil is improved by 0.97-1.04; and the composite soil passivator has the functions of restoring the acidized soil, improving the soil fertility and improving the physicochemical property of soil and has huge popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to a composite soil passivator for reducing cadmium and lead content and a preparation and use method thereof. Background technique [0002] Soil is the main material basis for human survival. However, due to the increasing mining, smelting, processing, and commercial manufacturing activities of heavy metals, many heavy metals such as lead, cadmium, and mercury enter the atmosphere, water, and soil, causing serious environmental pollution. According to statistics, about 30,000 tons of cadmium is released into the environment every year in the world, and 82%-94% of the cadmium will enter the soil. According to relevant statistics, about 40% of the lead in the world is used to make batteries, 20% is added to gasoline as an anti-knock agent in the form of alkyl lead, 12% is used for building materials, 6% is used for the outer protective la...

AI Technical Summary

Problems solved by technology

[0006] Most of the existing remediation technologies use a single organic passivator or inorganic passivator. With the increase of the risk of heavy metal pollution in rice field soil, the remediation effect of a single inorganic or organic passivator is often not ideal. Problems such as instability or damage to soil quality are difficult to meet repair standards

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