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A method for remediating hexavalent chromium-contaminated cultivated soil

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

Active Publication Date: 2021-02-26
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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  • A method for remediating hexavalent chromium-contaminated cultivated soil
  • A method for remediating hexavalent chromium-contaminated cultivated soil
  • A method for remediating hexavalent chromium-contaminated cultivated soil

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 repaired cultivated land soil and the relative root growth ratio of rice

[0023] Weigh oxalic acid and dissolve it in water, stir until oxalic acid is completely dissolved, and prepare oxalic acid solutions with different concentrations. 2.75M. The activated carbon powder and the oxalic acid solution were weighed according to the solid-to-liquid ratio of 1:10 mg / mL, and the activated carbon powder was soaked in the oxalic acid solution for 2 hours to obtain the activated carbon powder slurry. Weigh g-C according to the mass ratio of 1:100 3 N 4 / PDI@MOF powder and hexavalent chromium pollute the cultivated soil and degrade g-C 3 N 4 / PDI@MOF powder is mixed with hexavalent chromium-contaminated farmland soil and stirred evenly to obtain photocatalytic pre-mixed soil. According to the mass ratio of 100:5:5, respectively weigh the photocatalytic pre-mixed soil, humus, an...

Embodiment 2

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

[0034] Dissolve oxalic acid in water and stir until the oxalic acid is completely dissolved to prepare an oxalic acid solution with a concentration of 2.5M. According to the solid-to-liquid ratio of 3:10 mg / mL, the activated carbon powder and the oxalic acid solution were weighed and soaked in the oxalic acid solution for 3 hours to obtain the activated carbon powder slurry. Weigh g-C according to the mass ratio of 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 the cultivated soil and degrade g-C 3 N 4 / PDI@MOF powder is mixed with corresponding hexavalent chromium-contaminated farmland soil, and stirred evenly to obtain photocatalytic pre-mixed so...

Embodiment 3

[0044] Example 3 Effect of Humic Soil Addition on Hexavalent Chromium Leach Rate and Relative Root Growth Ratio of Rice in Restoration Cultivated Land Soil

[0045] Dissolve oxalic acid in water and stir until the oxalic acid is completely dissolved to prepare an oxalic acid solution with a concentration of 2.5M. Weigh the activated carbon powder and the oxalic acid solution according to the solid-to-liquid ratio of 3:10 mg / mL and soak the activated carbon powder in the oxalic acid solution for 3 hours to obtain the 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 the cultivated soil and degrade g-C 3 N 4 / PDI@MOF powder is mixed with corresponding hexavalent chromium-contaminated farmland soil, and stirred evenly to obtain photocatalytic pre-mixed 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, 100:15.5:10, 100:16.5:10 , 100:17.5:10 re...

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Abstract

The invention discloses a method for repairing cultivated soil polluted by hexavalent chromium. The repair method comprises the following steps: 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; C 3 N 4 / PDI@MOF powder mixed with hexavalent chromium-contaminated farmland soil, and stirred evenly to obtain photocatalytic pre-mixed soil; respectively weighed photocatalytic pre-mixed soil, humus soil, and activated carbon powder slurry to mix, added water, and stirred to obtain cultivated land soil to be repaired ; Xenon lamp irradiates the cultivated land soil to be repaired, during which the soil is turned every 1 hour, and the hexavalent chromium-contaminated cultivated land soil can be repaired in 4 to 6 hours. The invention has simple process, strong operability, wide sources of oxalic acid, activated carbon, humus, etc. involved, short repair time and good repair effect, not only saves energy but does not produce secondary pollution, and improves The original fertility of the cultivated land soil.

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 hexavalent chromium-contaminated cultivated land soil. Background technique [0002] The quality and safety of the cultivated land environment not only directly affects the quality of agricultural products but also affects the health of the personnel involved in the cultivation activities. At present, the heavy metal pollution of cultivated land in my country is serious, and vicious pollution incidents occur frequently. The "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the United Nations Ministry of Land and Resources pointed out that the rate of soil environmental pollution in my country's cultivated land is close to 20%. Industrial waste liquids from leather, electroplating, pharmaceutical, printing and dyeing industries usually contain a large amount of heavy m...

Claims

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Application Information

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Patent Type & Authority Patents(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