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Nanometer material and application and method for repairing soil cadmium pollution under combination of nanometer material, plants and microorganisms

A cadmium pollution and soil technology, which is applied in the restoration of polluted soil and other directions, can solve the problems of difficult control of technology and great influence of microbial remediation technology, and achieve the effects of increasing crop yield, improving physical and chemical properties, and enhancing absorption.

Inactive Publication Date: 2016-12-14
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of arbuscular mycorrhizal fungi to remediate soil Cd pollution alone is related to changes in environmental conditions such as temperature, oxygen, moisture, and pH, and microbial remediation technology is greatly affected by various environmental factors, making this technology difficult to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for remediating soil cadmium pollution: on cadmium-contaminated soil (the total cadmium content of the soil is 4.783mg / kg), 0.1% to 0.5% of nano zeolite and 0.05% to 0.1% of field fertilizer are applied per mu of ground Nano-magnesium hydroxide, evenly sprinkled, furrowed, or hole-applied on the soil surface, manually or mechanically turned the soil to fully mix the passivator and the soil, the depth of the soil was 15-20cm, and after 5-7 days of equilibrium, transplanted large Cabbage or lettuce seedlings.

[0036] After using the restoration method and technology, the pH of the soil is increased by 0.85-1.57, and the CEC of the soil is increased by 9.1%-23.6%. After using the restoration method and technology, the available cadmium content in the soil is 0.401-0.473mg / kg, which is 24.9%-36.3% lower than that before restoration (the effective Cd content in the soil is 0.630mg / kg). The Cd content in the edible part of Chinese cabbage was 1.562-2.037 mg / kg, whi...

Embodiment 2

[0039] A method for repairing heavy metal cadmium-contaminated soil: on cadmium-contaminated soil (the total cadmium content of the soil is 4.531mg / kg), apply 0.5% to 1.0% of nano-zeolite and 0.05% to 0.1% of field fertilizer per mu of ground Magnesium Hydroxide of nanometer, evenly spread, furrow, hole on the soil surface, manual or mechanical tillage to fully mix the passivator with the soil, tillage depth 15-20cm, equilibrate for 5-7 days, transplant Tomato seedlings. 15 days after the tomato seedlings were transplanted, sow the sterilized and accelerated ryegrass evenly around the tomato seedlings, and spread 20 to 40 grains around each plant.

[0040] During the period from 2012 to 2016, in Tongnan Vegetable Base in Chongqing, after using this restoration method and technology, the soil pH increased by 0.38-0.74, and the soil CEC increased by 8.5%-19.5%. 85 days after remediation of soil contaminated by heavy metal Cd, the available cadmium content in soil was 0.151-0.16...

Embodiment 3

[0042] A method for remediating heavy metal cadmium-contaminated soil: on soil Cd pollution (4.531mg / kg), apply 0.5% to 1.0% nano-zeolite of soil weight per mu of soil and 0.05-0.1% nano-magnesium hydroxide of field fertilizer , evenly spread, furrow, and hole on the soil surface, manually or mechanically turn the soil to fully mix the passivator with the soil, turn the soil to a depth of 15-20cm, and transplant the tomato seedlings after 5-7 days of balance. Tomato seedlings were inoculated with arbuscular mycorrhiza (15 g each of Glomus mosesi, Glomus intraradices, and Glomus tertiformis respectively 45 g) after 15 days of transplanting tomato seedlings.

[0043]During the period from 2012 to 2016, in Tongnan Vegetable Base in Chongqing City, after using this restoration method and technology, the soil pH increased by 0.51-0.76, and the soil CEC increased by 8.9%-20.1%. After remediation of heavy metal Cd pollution in soil for 100 days, the available cadmium content in soil ...

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Abstract

The invention provides a method for repairing vegetable garden soil cadmium pollution. Nano-zeolite with the soil weight being 0.5% to 1.0% and nano-magnesium hydroxide with the land fertilizer amount being 0.1% to 0.5% are used and are sufficiently and evenly mixed with soil through broadcasting, furrow dressing and hole application, the soil turning depth ranges from 15 cm to 20 cm, and after balance is conducted for 5 days to 7 days, vegetables or other crops are transplanted. According to the method, multiple repairing technologies such as in-situ passivation, plant repairing and microorganism repairing are organically combined, and soil Cd pollution is effectively repaired through a synergistic effect.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution in soil, and in particular relates to an application of using nanomaterials in remediating soil cadmium pollution, and also relates to a method for joint remediation of nanomaterials, plants and microorganisms. Background technique [0002] Heavy metal pollution is one of the most widely polluted and most harmful environmental problems in today's soil pollution. After entering the soil, heavy metal pollutants cannot be decomposed by soil microorganisms, and are easy to accumulate in the soil, thereby being absorbed by crops, causing quality and safety problems of agricultural products. production, thereby endangering human health. According to the survey, among the 329 key polluted areas in the suburbs, sewage irrigation canals, industrial and mining areas of 24 provinces (cities) in my country, the planting area of ​​field crops with excessive pollution is 600,000 hm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10B09C1/08
CPCB09C1/105B09C1/08
Inventor 徐卫红熊仕娟王正银江玲王卫中迟荪琳陈永勤陈序根陈蓉秦余丽赵婉伊
Owner SOUTHWEST UNIVERSITY
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