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Method for repairing arsenic-cadmium-lead composite contaminated soil by oxalic acid reinforced ciliate desert-grass-sedum alfredii hance intercropping

A technology for complex pollution and polluted soil, applied in the field of remediation of complex heavy metal-contaminated soil, can solve the problems of phytoremediation activators being easily polluted, reagents degraded, and operability to be considered, so as to avoid the risk of secondary pollution and promote absorption ability, the effect of no risk of secondary pollution

Inactive Publication Date: 2020-07-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phytoremediation activator prepared by this invention is easy to be polluted and cause the reagent to degrade. It needs to be prepared and used immediately and stored at a low temperature of 4°C. The operability in the actual application process needs to be considered.

Method used

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  • Method for repairing arsenic-cadmium-lead composite contaminated soil by oxalic acid reinforced ciliate desert-grass-sedum alfredii hance intercropping
  • Method for repairing arsenic-cadmium-lead composite contaminated soil by oxalic acid reinforced ciliate desert-grass-sedum alfredii hance intercropping
  • Method for repairing arsenic-cadmium-lead composite contaminated soil by oxalic acid reinforced ciliate desert-grass-sedum alfredii hance intercropping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Oxalic acid-enhanced hyperaccumulative plants Centipede Grass and Sedum sedum alone for remediation of arsenic, cadmium and lead compound polluted soil pot experiments.

[0031] The contaminated soil was collected from the surrounding area of ​​a lead-zinc smelting area in Hunan. The contents of heavy metals As, Cd, and Pb were 64.5, 10.4, and 358 mg / kg, respectively. Take 5 kg of soil from each pot, and add 0.27 mg / kg of urea and NH to each pot of soil. 4 h 2 PO 4 0.05mg / kg, KNO 3 0.10mg / kg soil, mix well, add water to 70% of the field water holding capacity, balance for 7 days, transplant the seedlings propagated by spores or rhizomes of 10-15cm centipede grass, 7-10cm Sedum sedum branches, There are 4 plants / pot of centipede grass alone, and 8 plants / pot of Sedum sedum alone. After 80 days, the oxalic acid treatment was set, and the oxalic acid solution was applied 3 times 21 days before harvest, once every 7 days, and the total amount of oxalic acid applied was 1...

Embodiment 2

[0033] In this example, the following method was used to carry out field microplot test of oxalic acid fortified Centipedegrass-Sedum sedum intercropping.

[0034] The cultivated soil was collected from the surrounding area of ​​an arsenic smelting area in Hunan Province. The content of heavy metals As, Cd, and Pb in the soil was 389 mg / kg, 3.5 mg / kg, and 150 mg / kg, respectively. The intercropping experiment of oxalic acid-enhanced centipede grass-sedum sedum was carried out in the polluted soil , the specific test operation includes the following steps:

[0035] (1) Plow and level the polymetallic contaminated soil to be repaired; the plow depth is 25 cm, and base fertilizer is added. The amount of base fertilizer including nitrogen fertilizer applied in N is 600kg / hm 2 , phosphate fertilizer with P 2 o 5 The application amount is 150kg / hm 2 , Potassium fertilizer in K 2 The application amount of O meter is 250kg / hm 2 , the soil moisture is controlled at 65%, and the ba...

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Abstract

The invention discloses a method for repairing arsenic-cadmium-lead composite contaminated soil by oxalic acid reinforced ciliate desert-grass-sedum alfredii hance intercropping, and the method comprises the following steps: ploughing a land to be remediated, and adding a base fertilizer; uniformly transplanting ciliate desert-grass and sedum alfredii hance seedlings which are consistent in size into the arsenic-cadmium-lead composite contaminated soil, ensuring proper temperature for planting, and arranging a nylon net between two rows of plants to separate root systems; 15-20 days before harvesting, applying an oxalic acid aqueous solution to plant root soil; and regularly mowing the above-ground parts of the ciliate desert-grass and the sedum alfredii hance. According to the method, oxalic acid is adopted to reinforce the ciliate desert-grass-sedum alfredii hance intercropping to restore the arsenic-cadmium-lead composite contaminated soil, and unique planting measures are adopted for synergistic effect, so that the removal effect of plants on arsenic, cadmium, lead and other heavy metals in the soil is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of remediation of complex heavy metal polluted soil, in particular to a method for using oxalic acid to strengthen centipede grass-sedum sedum intercropping to remediate arsenic, cadmium and lead compound polluted soil. Background technique [0002] At present, the remediation technologies of heavy metal-contaminated soils at home and abroad can be divided into physical remediation methods (including physical-chemical remediation methods), chemical remediation methods, and biological remediation methods. Physical remediation technologies mainly include foreign soil method, soil replacement method, thermal volatilization method, etc., which have the characteristics of quick results, but have the disadvantages of high cost, large engineering volume, failure to fundamentally remove heavy metals, etc., and are not suitable for large-scale contaminated soil remediation . Chemical restoration technology mainly in...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 肖细元周聪郭朝晖彭驰王小慧
Owner CENT SOUTH UNIV
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