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Passivator for heavy metal chromium pollution in southern paddy fields and preparation method thereof

A technology for heavy metal and chromium pollution, which is applied in the field of heavy metal pollution remediation in farmland soil, can solve problems such as polluted food security, and achieve the effects of increasing the output of agricultural products, reducing the price, and reducing the content of heavy metal chromium.

Pending Publication Date: 2021-03-05
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a passivator for heavy metal chromium pollution in southern paddy fields, which can reduce the content of free heavy metal chromium in the soil through passivation, thereby preventing heavy metal chromium in the soil from migrating to rice grains Medium, to ensure food safety and solve the food safety problem in the process of planting rice fields polluted by heavy metal chromium in southern China

Method used

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  • Passivator for heavy metal chromium pollution in southern paddy fields and preparation method thereof
  • Passivator for heavy metal chromium pollution in southern paddy fields and preparation method thereof
  • Passivator for heavy metal chromium pollution in southern paddy fields and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The passivator contains bean cake, distiller's grains, cellulose, phosphate rock powder, water, biochar and sepiolite, and the formula is as follows in parts by weight:

[0021]

[0022]

[0023] Add the wine tank into water, stir until dissolved, then add bean cake, phosphate rock powder, and cellulose to mix evenly, adjust the pH to 6-8, stack the materials and keep the moisture content not lower than 45% and not higher than 80%. The pile is turned once every two days, and piled up for a total of 8 days. After the fermentation is completed, biochar and sepiolite are added in corresponding parts by weight, fully stirred and evenly prepared.

[0024] A total of 3 paddy fields (numbered 1, 2, and 3) with low heavy metal chromium pollution were selected for experimentation, and the above-mentioned passivating agent was added to the paddy field according to the ratio of 300kg / mu, and the passivating agent was fully mixed with the soil by a tiller. After homogenizatio...

Embodiment 2

[0026] The passivator contains bean cake, distiller's grains, cellulose, phosphate rock powder, water, biochar and sepiolite, and the formula is as follows in parts by weight:

[0027]

[0028] Add the wine tank into water, stir until dissolved, then add bean cake, phosphate rock powder, and cellulose to mix evenly, adjust the pH to 6-8, stack the materials and keep the moisture content not lower than 45% and not higher than 80%. The pile is turned once every two days, and piled up for a total of 8 days. After the fermentation is completed, biochar and sepiolite are added in corresponding parts by weight, fully stirred and evenly prepared.

[0029] A total of 3 paddy fields (numbered 1, 2, and 3) polluted by heavy metal chromium were selected for the experiment, and the above-mentioned passivating agent was added to the paddy field according to the ratio of 500kg / mu, and the passivating agent was fully mixed with the soil by a tiller. After homogenization, plant a season of...

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Abstract

The invention provides a passivator for heavy metal chromium pollution in southern paddy fields, the passivator comprises biomass charcoal, sepiolite and an organic conditioner, and the organic conditioner is prepared by fermenting bean cake, vinasse, cellulose and ground phosphate rock; the invention also provides a preparation method of the passivator. The method comprises the following steps: adding vinasse into corresponding parts by weight of water, performing stirring until the vinasse is dissolved, adding bean cake, ground phosphate rock and cellulose, uniformly mixing the parts, regulating the pH value to 6-8, adding corresponding parts by weight of biomass charcoal and sepiolite after the fermentation is finished, and sufficiently and uniformly performing stirring to obtain the passivator. The raw materials of the passivator are easily available, and the passivator has no secondary pollution risk to the environment and is low in price; meanwhile, according to the passivator, the fermented soil organic conditioner is mixed with biomass charcoal and sepiolite to serve as the passivator, the passivator is weakly alkaline but most of southern paddy fields contain non-acid soil; the acid condition of the soil is improved and the yield of agricultural products is increased through application and scattering of the passivator.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution in farmland soil, and in particular relates to a passivator for heavy metal chromium pollution in southern paddy fields and a preparation method thereof. Background technique [0002] In my country's sewage irrigation areas, long-term and large-scale input of pollutants has caused the concentration of various pollutants in the soil to exceed the standard, which has become a key factor restricting my country's economic development and public health. In the National Soil Pollution Survey Bulletin, heavy metal chromium is one of the main heavy metal pollutants in my country. Long-term use of sewage irrigation will cause the accumulation of heavy metal residues in the soil. When the annual accumulation exceeds the environmental capacity of the soil, it will cause harm to food and human body, so it has been highly concerned by Chinese researchers. Chromium is a highly toxi...

Claims

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Application Information

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IPC IPC(8): C05G3/80C09K17/40
CPCC05G3/80C05B17/00C09K17/40C05D5/00C05D9/00C05F5/002C05F5/008C05F11/00C05F17/00
Inventor 冉宇雍正景琪杨浩朱颖马烁
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY