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Method for repairing arsenic contaminated soil by using pteris vittata

A technology of centipede grass and arsenic pollution, which is applied in the field of centipede grass to restore arsenic-contaminated soil, which can solve the problems of crop yield and quality decline, soil degradation, etc., and achieve the effects of strong adaptability, improved adsorption capacity, and no secondary pollution

Inactive Publication Date: 2019-02-01
湖北农谷畅响土壤修复科技股份有限公司
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AI Technical Summary

Problems solved by technology

[0004] Accumulation of arsenic in the soil to a level that degrades the soil and reduces the yield and quality of the crops grown

Method used

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  • Method for repairing arsenic contaminated soil by using pteris vittata
  • Method for repairing arsenic contaminated soil by using pteris vittata
  • Method for repairing arsenic contaminated soil by using pteris vittata

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The soil was taken from Hushan Village, Huji Town, Zhongxiang City, Hubei Province. The soil type was clay, with arsenic content of 50 mg / kg, total phosphorus content of 880 mg / kg, available phosphorus of 19.0 mg / kg, and pH of 7.23. Put 5kg of soil in a plastic pot into the air-dried soil passed through a 2mm sieve, apply 0.42kg of urea and 0.34kg of potassium chloride, then put it into 1 experimental pot, repeat the above operation to prepare 5 experimental pots, and conduct 5 different tests on the 5 experimental pots. Treatment: add arsenic compound Na to 5 experimental pots 2 HASO 4 7H2O (analytical pure, purity ≥ 99.7%, Alfa Aesear company, the United States) 400mg / kg, calcium superphosphate Ca(H 2 PO 4 ) 2 , so that the phosphorus content in the soil of the four experimental pots reached 200, 400, 600, and 800 mg / kg respectively, and the remaining one experimental pot did not add Ca(H 2 PO 4 ) 2 , the soil in the 5 experimental pots was balanced for two week...

Embodiment 2

[0031] A method for repairing arsenic-polluted soil with Centipede Grass, comprising the following steps:

[0032] S1: Plow the soil in the arsenic-contaminated area where the soil arsenic content is 60-120mg / kg, then apply urea 60-80kg / mu and potassium chloride 40-60kg / mu, and at the same time apply Ca(H 2 PO 4 ) 2 Make the phosphorus content in the soil reach 200-800mg / kg;

[0033] S2: plant centipede grass seedlings in the soil according to the density of 3000-5000 plants / mu;

[0034] S3: Harvest the aerial part and the root system part of the centipede grass when the centipede grass grows for 100-140 days.

[0035] Soil moisture content is controlled at 25%-35%.

[0036] The arsenic content in the soil of the arsenic-contaminated area treated by this method is obviously reduced by 10%-15%. Can find out from embodiment 1-2 that adding a large amount of phosphorus can improve the adsorption capacity and the enrichment coefficient of centipede grass, phosphorus and arsen...

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Abstract

The invention discloses a method for repairing arsenic contaminated soil by using pteris vittata. The method comprises the following steps that S1, soil plowing is carried out in an arsenic contaminated area, wherein the soil arsenic content of the arsenic contaminated area is 60-120mg / kg, and then according to application of urea 60-80kg / mu and potassium chloride 40-60kg / mu, applying of Ca(H2PO4)2 is carried out at the same time to enable the phosphorus content in the soil to reach 200-800mg / kg; S2, pteris vittata seedlings are planted according to the density of 3000-5000 plants / mu; and S3,after the pteris vittata grows 100-140 days, the aboveground parts and the root parts of the pteris vittata are harvested. The method can improve the adsorption capacity and enrichment coefficient ofthe pteris vittata, and phosphorus and arsenic do not have an antagonistic effect and even have a synergistic effect at a high concentration. The method has the characteristics of low cost, large biomass, high adaptability and no secondary pollution.

Description

technical field [0001] The invention relates to the field of heavy metal soil restoration, in particular to a method for repairing arsenic-polluted soil with centipede grass. Background technique [0002] A high degree of industrialization has accelerated the exploitation of natural resources, and the ensuing environmental pollution has put a huge pressure on the natural ecological environment. Mining mining has seriously damaged the ecosystem, leading to the deterioration of soil quality and the reduction of wild plant resources. Make the land useless. [0003] Arsenic is a chemical element that widely exists in nature, and its common forms are arsenate and arsenite. In addition, organic arsenic with different degrees of methylation exists in organisms, including monomethylarsinic acid and dimethylarsinic acid, etc. Arsenic and its soluble compounds are highly toxic, and the main component of the highly toxic substance arsenic is As 2 o 3 . Arsenic can also enter the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00A01B79/02
CPCA01B79/02B09C1/105
Inventor 李卫武
Owner 湖北农谷畅响土壤修复科技股份有限公司
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