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Method for repairing arable soil contaminated by hexavalent chromium

A technology for arable soil and hexavalent chromium is applied in the field of remediation of hexavalent chromium-contaminated arable soil, which can solve the problems of long remediation period, easy migration, and arable soil pollution, and achieves short remediation time, strong operability and good remediation effect. Effect

Active Publication Date: 2019-11-19
武汉市秀谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The illegal discharge of these industrial waste liquids will cause serious hexavalent chromium pollution to the cultivated land soil around the plant.
Hexavalent chromium has the characteristics of high toxicity, easy migration, and high teratogenic rate
[0004] Electric repair technology has problems such as high energy consumption and deep treatment of chromium-enriched areas
Bioremediation technology has the problems of long repair period and poor repair effect

Method used

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  • Method for repairing arable soil contaminated by hexavalent chromium
  • Method for repairing arable soil contaminated by hexavalent chromium
  • Method for repairing arable soil contaminated by hexavalent chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 The effect of oxalic acid concentration on the leaching rate of hexavalent chromium in rehabilitated farmland soil and the relative root growth ratio of rice

[0023] Weigh oxalic acid and dissolve it in water, stir until the oxalic acid is completely dissolved, and prepare oxalic acid solutions of different concentrations. The concentrations of the oxalic acid solutions are 0.25M, 0.35M, 0.45M, 0.5M, 1.5M, 2.5M, 2.55M, 2.65M, 2.75M. The activated carbon powder and the oxalic acid solution were weighed according to the solid-liquid ratio of 1:10 mg / mL, and the activated carbon powder was soaked in the oxalic acid solution for 2 hours to obtain an activated carbon powder slurry. Weigh g-C according to mass ratio 1:100 3 N 4 / PDI@MOF powder and hexavalent chromium pollute cultivated soil and g-C 3 N 4 / PDI@MOF powder is mixed with hexavalent chromium contaminated farmland soil and mixed evenly to obtain photocatalytic premixed soil. Weigh the photocatalytic premix...

Embodiment 2

[0033] Example 2g-C 3 N 4 / PDI@MOF powder and hexavalent chromium contaminated farmland soil quality ratio on the leaching rate of hexavalent chromium in rehabilitated farmland soil and the relative root growth ratio of rice

[0034] Weigh oxalic acid and dissolve in water, stir until the oxalic acid is completely dissolved, prepare an oxalic acid solution, the concentration of the oxalic acid solution is 2.5M. According to the solid-liquid ratio of 3:10 mg / mL, the activated carbon powder and the oxalic acid solution are weighed and the activated carbon powder is soaked in the oxalic acid solution for 3 hours to obtain the activated carbon powder slurry. Weigh g-C according to the mass ratio 0.5: 100, 0.7: 100, 0.9: 100, 1: 100, 3: 100, 5: 100, 5.1: 100, 5.3: 100, 5.5: 100 3 N 4 / PDI@MOF powder and hexavalent chromium pollute cultivated soil and g-C 3 N 4 The / PDI@MOF powder is mixed with the corresponding hexavalent chromium contaminated farmland soil and stirred evenly to obtain...

Embodiment 3

[0044] Example 3 Effect of humus soil content on the leaching rate of hexavalent chromium in the rehabilitated farmland soil and the relative root growth ratio of rice

[0045] Weigh oxalic acid and dissolve in water, stir until the oxalic acid is completely dissolved, prepare an oxalic acid solution, the concentration of the oxalic acid solution is 2.5M. Weigh the activated carbon powder and the oxalic acid solution according to the solid-liquid ratio of 3:10 mg / mL, and soak the activated carbon powder in the oxalic acid solution for 3 hours to obtain an activated carbon powder slurry. Weigh g-C according to the mass ratio of 5:100 3 N 4 / PDI@MOF powder and hexavalent chromium pollute cultivated soil and g-C 3 N 4 The / PDI@MOF powder is mixed with the corresponding hexavalent chromium contaminated farmland soil and stirred evenly to obtain the photocatalytic premixed soil. According to the mass ratio 100: 2.5: 10, 100: 3.5: 10, 100: 4.5: 10, 100: 5: 10, 100: 10: 10, 100: 15: 10,...

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Abstract

The invention discloses a method for repairing arable soil contaminated by hexavalent chromium. The method comprises the following steps: weighing oxalic acid and dissolving oxalic acid in water to prepare an oxalic acid solution; soaking activated carbon powder in the oxalic acid solution to obtain activated carbon powder slurry; mixing g-C3N4 / PDI@MOF powder with arable soil contaminated by hexavalent chromium, and carrying out uniform mixing under stirring to obtain photocatalysis pre-doped soil; respectively weighing the photocatalysis pre-doped soil, humus soil and the activated carbon powder slurry, carrying out mixing, adding water, and carrying out stirring to obtain to-be-remediated arable soil; and irradiating the to-be-remediated arable soil by using an xenon lamp, and turning over the soil once every other hour in the period of irradiation so as to realize remediation of the arable soil contaminated by hexavalent chromium within 4-6 hours. The method is simple in process andhigh in operability; used oxalic acid, activated carbon, humus soil and the like are wide available; remediation time is short; remediation effect is good; energy is saved; secondary pollution is avoided; and the original fertility of the arable soil is improved while hexavalent chromium harm is eliminated.

Description

Technical field [0001] The invention relates to the field of soil treatment and restoration of polluted agricultural land, in particular to a method for repairing soil contaminated by hexavalent chromium in farmland. Background technique [0002] The environmental quality and safety of cultivated land not only directly affects the quality of agricultural products, but also affects the health of the personnel involved in farming activities. At present, the heavy metal pollution of cultivated land in my country is severe, and serious pollution incidents occur frequently. The "National Survey Bulletin of Soil Pollution Status" issued by the Ministry of Environmental Protection and the United Nations Ministry of Land and Resources pointed out that the pollution rate of soil pollution in my country's farmland is close to 20%. The industrial waste produced by leather, electroplating, pharmaceutical, printing and dyeing industries usually contains a large amount of heavy metal chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 黄涛宋东平张树文刘龙飞陶骏骏周璐璐徐娇娇
Owner 武汉市秀谷科技有限公司
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