Method for rapid in-situ remediation soil polluted by heavy metals

An in-situ remediation and heavy metal technology, applied in the field of in-situ remediation of contaminated soil, can solve the problems of complex, secondary pollution operation, high cost, etc., and achieve the effects of convenient material collection, reduced absorption and accumulation, and low cost

Inactive Publication Date: 2010-06-09
HUAZHONG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost, easy to cause secondary pollution and complicated operation in the current heavy metal pollution, especially cadmium-contaminated soil remediation methods, to open up a rational use of crop straw, reduce resource waste and environmental pollution, and at the same time prevent heavy metal pollution Soil remediation provides cheap, efficient and environmentally friendly in-situ fixation technology

Method used

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  • Method for rapid in-situ remediation soil polluted by heavy metals
  • Method for rapid in-situ remediation soil polluted by heavy metals
  • Method for rapid in-situ remediation soil polluted by heavy metals

Examples

Experimental program
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Effect test

Embodiment 1

[0013] The test site was selected in Hubei, near the Daye Nonferrous Metal Smelter. The total cadmium content in the soil was 4.55mg / kg, and the total copper content was 289.9mg / kg. The dried rice straw (with a water content of 5%) is crushed mechanically to make its length equal to or less than 2 cm, and used as a restoration material for repairing cadmium-contaminated soil. The heavy metal fixation effect of repair materials was verified by field experiments.

[0014] Rice straw was applied to the surface layer (0-20cm) of the polluted soil at an application rate of 0, 5.2, 7.7, 10.3, 15.4, 23.2 tons / ha, and soil samples were taken for analysis after three months (ie 90 days). See Table 1 for the soil pH, organic matter and available phosphorus content after remediation.

[0015] Table 1 Test of soil pH, organic matter and available phosphorus content after restoration by the present invention

[0016]

[0017] Sposito continuous extraction method was used (Sposito G, L...

Embodiment 2

[0021] The 2cm rice straw is applied to the surface layer (0-20cm) of the cadmium-contaminated soil, mixed evenly, and the application rate is 0, 7.7, 15.4, 23.2 tons / ha, and wheat is sown three months later. The grains are harvested after the wheat has matured. The grains were dried at 65°C for about 48 hours, crushed by a stainless steel grinder, and passed through a 60-mesh nylon sieve. Cadmium and copper in wheat grains were digested with nitric acid-perchloric acid and determined by atomic absorption spectrophotometry.

[0022] The contents of copper and cadmium in wheat grains planted and harvested after soil remediation are shown in image 3 , Figure 4 , the application of rice straw can significantly reduce the content of copper and cadmium in wheat grain. The copper content in the grain was 8.56mg kg by the control treatment -1 Reduced to 3.21mg kg -1 , decreased by 62.5%, reaching the level required for pollution-free agricultural products (see image 3 ). Th...

Embodiment 3

[0024] Apply 2cm-long rice straw to the surface layer (0-20cm) of cadmium-contaminated soil, mix evenly, and apply 0, 5.2, 10.3, 15.4 tons / ha, and sow pak choi three months later. After the pakchoi matured, the aboveground parts were harvested, and the yield of pakchoi was recorded. Plant samples were dried at 65°C for about 48 hours, pulverized by a stainless steel pulverizer, and passed through a 60-mesh nylon sieve. Cadmium and copper in the shoots of Chinese cabbage were determined by nitric acid-perchloric acid digestion and atomic absorption spectrophotometry.

[0025] The output of pakchoi planted in repaired soil is as follows: Figure 5 shown. The application of rice straw can significantly increase the yield of pakchoi, with a maximum increase of 126.5%. The contents of copper and cadmium in the aboveground part of Chinese cabbage are shown in Image 6 , Figure 7 . The application of rice straw can significantly reduce the content of copper and cadmium in the ...

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Abstract

The invention belongs to the technical field of in-situ repair of soil polluted by heavy metals, in particular to a method for controlling and repairing soil polluted by a heavy metal of cadmium in situ. The method is characterized in that wheat straws with water content of 5 percent are crushed to straws less than or equal to 2 cm; the straws and 0-20cm of soil polluted by the heavy metals on the surface layer are mixed and treated for 90 days; and according to the standard that the content of cadmium in the polluted soil is 4.55mg / kg, the consumption of land blocks for planting Chinese cabbages is 15.4 ton / hectare and the consumption of land blocks for planting wheat is 23.2 ton / hectare. Farmland treated by the technology can be used for agriculture planting. The invention provides energy-saving, rapid and environment-friendly method for repairing farmland polluted by the heavy metal of cadmium in-situ.

Description

technical field [0001] The invention relates to an in-situ restoration technology for polluted soil, in particular to a method for in-situ treatment and restoration of heavy metal cadmium pollution in soil. The invention can passivate and fix the heavy metal cadmium in the polluted soil in situ, reduce the bioavailability of the heavy metal in the soil, reduce the absorption and accumulation of the heavy metal by crops and vegetables, and ensure the safety of agricultural products. technical background [0002] Due to mining and smelting, sewage irrigation, and extensive application of pesticides and fertilizers, a large number of cultivated lands in my country have been severely polluted by heavy metals. Heavy metals in the soil do not undergo microbial or chemical degradation, and the heavy metals remaining in the soil may seep into groundwater and pollute people's drinking water. At the same time, it may also enter the food chain through different channels, and accumulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 黄巧云易普拉欣李明蔡鹏荣兴民梁巍
Owner HUAZHONG AGRI UNIV
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