Method for restoring paddy cadmium pollution by combining water management with passivator adding

A technology of cadmium pollution and passivation agent, which is applied in the restoration of polluted soil, etc., to achieve the effect of ensuring food security, great significance, and simple application

Inactive Publication Date: 2017-08-08
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses special materials mixed together during construction or use to protect crops from heavy metal contamination caused by water runoff. These compositions are easy to apply evenly over large areas without causing damage to their roots. They work well when used alone but may lose its ability if they get into deeper groundwater layers where there could harm them more severely due to environmental factors such as acidic conditions at certain depth levels below sea level (pH<7).

Problems solved by technology

This patents discusses different methods used during recovery from contamination areas on slopes or other water bodies where there may also accumulate harmful materials such as lead that can cause injury if absorbed into living organism. These techniques include both physical removal and chemistry solutions like phosphorus acid esters and zinc sulfates. Additionally, some research suggests that even small amounts of certain compounds found naturally occur within crop roots themselves when they enter our natural ecosystems with high levels of nitrogen, making them potential sources of secondary nutrients. Therefore, finding ways to restore their original condition without damaging surrounding vegetables could help address concerns over public safety issues related to heavy metal exposures.

Method used

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  • Method for restoring paddy cadmium pollution by combining water management with passivator adding
  • Method for restoring paddy cadmium pollution by combining water management with passivator adding
  • Method for restoring paddy cadmium pollution by combining water management with passivator adding

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Embodiment 1

[0024] Embodiment 1: a kind of water management combined with passivating agent adds the method for repairing the cadmium pollution of paddy field, comprises the following steps:

[0025] (1) Composite passivation material treatment of cadmium-contaminated paddy soil: Before plowing and fertilizing the cadmium-contaminated paddy soil, spread the composite passivation material evenly on the surface of the soil, and then plow the soil at a depth of 15cm. The material is fully mixed with the paddy field soil, and balanced for 35 days;

[0026] (2) Transplanting rice, water management: transplant the indica-type three-line hybrid rice T You 272 after the soil balance is good, and use the long-term flooding management mode for the soil during the rice growth process;

[0027] Wherein: the composite passivation material is a mixture of natural palygorskite and mercapto-modified palygorskite in a ratio of 100:3 by weight; the application amount of the composite passivation material i...

Embodiment 2

[0031] Embodiment 2: A kind of water management combined with the method of passivating agent adding and repairing the cadmium pollution of paddy field, soil plowing depth is 20cm, composite passivation material and paddy field soil are fully mixed, balance 40 days; Described composite passivation material is natural Palygorskite and mercapto-modified palygorskite are mixed in a ratio of 100:4 by weight; the application rate of the composite passivation material is 2.1 kg / m 2The concrete preparation method of described mercapto-modified palygorskite is: earlier 5g natural palygorskite is dispersed in 195 deionized water, forms palygorskite suspension, the mass concentration of natural palygorskite in palygorskite suspension 2.5%; the palygorskite suspension was stirred on a disperser at a speed of 12000r / min for 7 minutes, and the obtained mercapto-modified palygorskite gel system was kept at 80°C for 30 hours, and then the gel was removed from Take it out from the gel system,...

Embodiment 3

[0032] Embodiment 3: a kind of water management combined with the method of passivating agent adding and repairing the cadmium pollution of paddy field, soil plowing depth is 40cm, composite passivation material and paddy field soil are fully mixed, balance 45 days; Described composite passivation material is natural Palygorskite and mercapto-modified palygorskite are mixed in a ratio of 100:5 by weight; the application rate of the composite passivation material is 2.25kg / m 2 The concrete preparation method of described mercapto-modified palygorskite is: earlier 10g natural palygorskite is dispersed in 190g deionized water, forms palygorskite suspension, the mass concentration of natural palygorskite in palygorskite suspension 5%; the palygorskite suspension was stirred on a disperser at a high speed of 12000r / min for 10 minutes, and the obtained mercapto-modified palygorskite gel system was kept at 80°C for 36 hours, and then the gel was removed from Take it out from the gel ...

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Abstract

The invention belongs to the technical fields of control of soil pollution and quality safety of agricultural products and provides a method for restoring paddy cadmium pollution by combining water management with passivator adding in order to solve the control problem of paddies with severe cadmium pollution. The method comprises the steps that cadmium polluted paddy soil is treated through a composite passive material, rice is transplanted, water management is conducted, and the composite passive material is formed by proportionally mixing natural palygorskite and sulfydryl-modified palygorskite. Rice with the cadmium content reaching the standard can be produced through the paddy soil with severe cadmium pollution, the soil pollution problem is solved, the food security is ensured, and the method is significant. The composite passive material is easy to apply, low in cost and free of adverse effect on environment and does not influence regular growth and yield formation of rice, and the passivation effect on cadmium in soil can be maintained for 3-4 years by applying the composite passive material to soil once. After the composite passive material is applied to the cadmium polluted paddies soaked in water for a long time, the effect that cadmium accumulation is reduced is remarkable, and the cadmium content of produced brown rice meets the current national standard.

Description

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Claims

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Application Information

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Owner TAIYUAN INST OF TECH
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