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Method for repairing farmland soil polluted by cadmium

A technology for cadmium pollution and soil, applied in the field of cadmium pollution soil remediation and treatment, can solve the problems of poor soil remediation technology, affecting farmland ecological environment, unable to continue farming, etc. Effect

Inactive Publication Date: 2016-05-25
JIANGSU GEOLOGICAL SURVEY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the existing cadmium-contaminated farmland soil remediation technology has poor effect, high cost, incomplete remediation, and cannot continue to cultivate after remediation, which seriously affects the ecological environment of farmland, the present invention provides a method for remediating cadmium-contaminated farmland soil, which can effectively improve The remediation effect of cadmium-contaminated farmland soil, the remediation cost is low, the remediation period is stable, continuous, and long-term, and the amount of labor is small. It is a natural remediation technology and brings a good ecological environment to the farmland.

Method used

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  • Method for repairing farmland soil polluted by cadmium
  • Method for repairing farmland soil polluted by cadmium
  • Method for repairing farmland soil polluted by cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for repairing cadmium-contaminated farmland soil, comprising the following steps:

[0032] (1) Select a cadmium-contaminated farmland in Xishan District, Wuxi City, Jiangsu Province, with an area of ​​2.6 mu, measure the soil Cd content and its difference, the soil Cd distribution is uneven, the Cd content is between 4-13mg / kg, and the average Cd content more than 6.0mg / kg; Cd and other heavy metal pollutants are mainly concentrated in the soil between the surface and 20cm, and the surface soil not only has significantly higher Cd and Hg, but also has slight Zn enrichment and soil acidification; The land is 80 meters long and 22 meters wide (covering an area of ​​about 2.6 acres) for sorting, renting machinery and labor to finely crush and level the soil at a depth of about 20cm or more, ditching and dividing ridges, and dividing them into 5 ridges according to the natural length of the field. Each ridge The ground is 80m long x 3.9m wide, and 1.2m drainage dit...

Embodiment 2

[0039] Same as Example 1, the difference is: in the selected cadmium polluted farmland in Example 1, choose half acre to plant weeping willows and other seedlings for comparison by common horticulture, and the results show that on the Cd polluted land of the same lot, the present invention There is a significant difference in the effect of absorbing soil Cd with other plants planted by common horticulture. Taking the leaves of the plant growth period of 1 year as an example, the Cd content in the leaves of Suliu 172 in the present invention is the highest, and the leaves of Suliu 172 absorb soil Cd. The bioconcentration factor BCF (BCF=leaf Cd concentration / soil Cd concentration) reaches 6.33 on average, which is much higher than other seedlings such as weeping willow and red maple planted by common horticulture. The comparison results are as follows: (see Table 1).

[0040] Table 1 Suliu 172 of the present invention, other nursery stock leaves, soil sample Cd content (mg / kg) a...

Embodiment 3

[0044] Same as Example 1, the difference is: in order to improve the processing effect of the present invention's method to cadmium-contaminated farmland soil, step (3) in the present embodiment is carried out to 1 year from the farmland soil and digs up the whole tree when the test is carried out Willows were replanted with Suliu 172 cuttings, and then removed after 1 year, and repeated 4 times to complete the restoration of cadmium-contaminated farmland soil. Although the removal and planting frequency of Suliu 172 is relatively high in this embodiment, it can also achieve a good restoration effect: the highest Cd content in the soil drops from 10.7mg / kg to 6.3mg / kg, and the maximum drop is close to 41%.

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Abstract

The invention discloses a method for repairing farmland soil polluted by cadmium, belongs to the technical field of repairing and treatment of the farmland soil polluted by the cadmium, and solves the problems that the existing technology for repairing the farmland soil polluted by the cadmium is poor in effect, high in cost and not thorough in repairing, the soil cannot be used for farming after being repaired, and the farmland ecologic environment is affected severely. The method includes the steps of firstly, selecting farmland polluted by the cadmium, ploughing the soil of the farmland, crushing the soil, ridging, and arranging draining ditches; secondly, planting Salix Jiangsuensis CL. 172 cuttage in the farmland soil processed by the first step; thirdly, performing agricultural management and protection which includes watering, pest control and weeding on the Salix Jiangsuensis CL. 172 cuttage to allow the same to survive and grow normally. The method has the advantages that the repairing effect of the farmland soil polluted by the cadmium can be increased effectively, the method is low in repairing cost, stable, continuous and durable in repairing cycle and small in labor intensity of workers, the method belongs to the natural repairing technology, and a good ecological environment of the farmland is achieved at the same time.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of cadmium-contaminated soil, and more specifically relates to a method for remediating cadmium-contaminated farmland soil. Background technique [0002] The impact of heavy metal pollution on the environment has always been a research hotspot in the field of ecology, and cadmium (Cd) pollution has attracted more attention. The control of Cd pollution in farmland has great practical significance in my country. Treatment of Cd pollution in farmland requires mature remediation technology. Soil Cd-polluted phytoremediation technology is a once-and-for-all method to fundamentally remove residual heavy metals in soil. It is ecological, sustainable, and green, and is the most easily accepted by people. The phytoremediation technology for soil contaminated by heavy metals such as Cd has attracted extensive attention in the fields of soil science, environmental science, ecology, agronomy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 廖启林朱伯万金洋任静华华明常青
Owner JIANGSU GEOLOGICAL SURVEY INST
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