Combined reinforced method for repairing cadmium polluted soil

A technology for cadmium-contaminated soil and soil, applied in the field of phytoremediation of heavy metal-contaminated soil, can solve the problems of increasing phytoremediation costs, difficult degradation of chelates, affecting the restoration effect, etc., and achieves reduction of restoration costs and environmental risks and good ornamental value. , the effect of good environmental benefits

Inactive Publication Date: 2009-06-24
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

However, there are also many problems in the chelation enhancement technology: (1) chelating agents and the chelates formed with heavy metals generally have strong phytotoxicity, which seriously inhibits plant growth, reduces biological production, and affects the restoration effect; (2) ) After the chelating agent activates the heavy metal, its chelate is not easy to degrade, which will cause serious heavy metal percolation phenomenon, causing secondary pollution to the environment such as surface water and groundwater; (3) most of the chelating agents currently used are non-specific , while activating heavy metals, it also increases the amount of leaching loss of some micronutrient elements, resulting in a decrease in soil fertility; (4) Chelating agents are generally expensive, and their large-scale use will inevitably increase the cost of phytoremediation

Method used

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  • Combined reinforced method for repairing cadmium polluted soil
  • Combined reinforced method for repairing cadmium polluted soil
  • Combined reinforced method for repairing cadmium polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Common ammonium nitrogen fertilizers include ammonium sulfate, ammonium chloride, etc. In order to select a suitable nitrogen fertilizer for joint enhanced restoration, this experiment was carried out. The experimental site is in the net room of the Shenyang Institute of Applied Ecology, Chinese Academy of Sciences. The site is in the center of Shenyang. There are no pollution sources around the experimental site, which is an uncontaminated area for heavy metals. The potting test soil is cadmium-contaminated soil collected from Zhangshi irrigation area in Shenyang City. The soil type is meadow brown soil. Its basic physical and chemical properties are: pH value 5.89, organic matter content 1.75%, and total Cd content 5.09mg / kg.

[0018] In this experiment, 5 treatments were set up, namely: CK (no nitrogen fertilizer was applied to the control), (NH 4 ) 2 SO 4 2 gradients: S1 (0.2g / kg N), S2 (0.4g / kg N); NH 4 Cl 2 gradients: Cl (0.2g / kg N), C2 (0.4g / kg N); each treatm...

Embodiment 2

[0025] Experimental place and test soil, plant are identical with embodiment 1. A total of 7 treatments were set up, namely: CK (no nitrogen fertilizer was applied to the control); (NH 4 ) 2 SO 42 gradients: N1 (0.2g / kg N), N2 (0.4g / kgN); EGTA 2 gradients: E1 (1mmol / kg), E2 (2mmol / kg); joint treatment: N1+E1, N2+E1 ; Each treatment was repeated 3 times.

[0026] Chelating agent EGTA application time: 45 days after the malacock grass is transplanted, add the corresponding concentration of EGTA set above in the form of a solution near the root zone of the soil surface, and harvest the plants after 15 days of treatment. The sample treatment is the same as in Example 1.

[0027] The experimental results are as follows: figure 1 The above-ground biomass of Malabiopsis under different treatments is given. Analysis of variance showed that compared with the control (CK), nitrogen fertilizer treatments N1, N2 and combined treatments N1+E1, N2+E1 all significantly increased the abo...

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Abstract

The invention relates to phytoremediation for heavy metal polluted soil, in particular to a method for utilizing combined reinforced measures to remedy cadmium-polluted soil. The method is to apply an ammonium fertilizer in the soil to be remedied, plant maidenhair, add a chelating agent into the soil when the maidenhair is grown to the flowering period or the maturation period, and completely remove the plants after the plants are grown for 10 to 15 days so as to achieve the aim of remedying the cadmium-polluted soil. The method not only can obviously relieve the harm of the chelating agent on the plants but also can obviously improve the reinforced remedying effect of the chelating agent by applying the acid fertilizer so as to accelerate the phytoremediation process of the cadmium-polluted soil. Moreover, the method has the advantages of low remediation cost, high remediation efficiency, strong maneuverability, small environmental risk and the like, and can beautify the environment when simultaneously treating the polluted soil.

Description

technical field [0001] The invention relates to phytoremediation of soil polluted by heavy metals, in particular to a method for remediating cadmium-contaminated soil by means of combined strengthening measures. Background technique [0002] Cadmium pollution in my country's soil environment mainly comes from waste water, waste gas and waste residue discharged by industrial and mining enterprises, as well as agricultural production activities such as sewage irrigation and sludge agricultural use. According to a survey conducted by the Ministry of Agriculture on 5.48 million ha of farmland in 320 key polluted areas in 24 provinces and cities nationwide in 2001, the area of ​​pollutants exceeding the standard in field products in polluted areas in the country accounted for 20% of the total area of ​​farmland in polluted areas, while Cd polluted agricultural products The area exceeding the standard reaches 278,600 ha [Document 1: Chinese Academy of Social Sciences Environment a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/10
Inventor 王林周启星于志国刘维涛
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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