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Method for utilizing sorghum bicolor to restore caesium-contaminated soil

A technology for polluted soil and sweet sorghum, which is applied in the restoration of polluted soil and other directions to achieve the effects of low treatment cost, simple operation and process, and rapid growth

Active Publication Date: 2014-09-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Sweet sorghum is a high-yielding non-edible crop that has attracted attention in the field of energy. There are few reports on the treatment of radioactively contaminated soil / water pollution. So far, there has been no report on the use of crop sweet sorghum (Sorghum bicolor L.) to restore radioactivity in tropical monsoon marine climate areas. Reports of Contaminated Soil

Method used

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  • Method for utilizing sorghum bicolor to restore caesium-contaminated soil
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  • Method for utilizing sorghum bicolor to restore caesium-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1. Absorption capacity of cesium by each organ of sweet sorghum in pot test

[0026] The pot experiment site is in a farm in Dongfang City, Hainan Province. There is no pollution source around the test site, and it is an area not polluted by heavy metals. Dongfang City is located in the southwest of Hainan Province, with east longitude 108°37′ to 109°07′ and north latitude 18°43′ to 19°18′. Dongfang City has a tropical monsoon oceanic climate with abundant sunshine and an annual average temperature of 25°C. The average temperature in January is 18.4°C, and the extreme minimum temperature is 1.4°C. The average temperature in July is 29°C, and the extreme maximum temperature is 38.8°C. The average annual rainfall is about 1100 mm, and the average annual sunshine hours are about 2500 hours. The soil quality of the soil in this area is mainly sandy soil. The soil used in the pot experiment was collected from the inner surface soil of a farm in Dongfang City. T...

Embodiment 2

[0039] Example 2. The enrichment characteristics of cesium in soil by sweet sorghum

[0040] Planting, sampling and analysis steps are the same as in Example 1. However, the cesium pollution level was set to 100mgCs / kg and 400mg Cs / kg, sweet sorghum was harvested when it was mature, and the aboveground part was obtained after division, and the cesium content in the aboveground part, underground part and soil were measured and calculated respectively.

[0041] The results showed that the cesium accumulation in the shoot of sweet sorghum was more than 758 mg / kg, but only 336 mg / kg in the root, and the transfer coefficient (ratio of cesium content in the shoot and root) was more than 2.0, far greater than 1. At the same time, the concentration of cesium accumulated in the aboveground part is higher than that in the soil, that is, the enrichment factor (the ratio of cesium content in the aboveground part to that in the soil) is much greater than 1, reaching 6.4.

[0042] It can b...

Embodiment 3

[0045] Example 3. Growth status (plant height) of sweet sorghum on cesium-contaminated soil

[0046] Germinate and raise seedlings of sweet sorghum seeds in a nursery. After 3 leaves grow, seedlings with consistent growth are selected and randomly transplanted into flower pots for cultivation. The cesium pollution level is set at 40 mgCs / kg. Other planting steps are as in Example 1. The height of sweet sorghum was measured at 57 days of growth, and the results are shown in Table 4. In the 40mg Cs / kg contaminated soil, the growth of sweet sorghum was basically not affected, and its plant height was even higher than that of the control sweet sorghum.

[0047] Table 4 The height (cm) of sweet sorghum under 40mg Cs / kg cesium pollution level

[0048]

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Abstract

The invention discloses a method for utilizing sorghum bicolor to restore caesium-contaminated soil, and belongs to the technical field of environment plant restoration. The method comprises: planting sorghum bicolor in caesium-contaminated soil, and after sorghum bicolor is mature, harvesting the overground part or integrally moving sorghum bicolor away, so as to reach the purpose of restoring caesium-contaminated soil. Energy-plant sorghum bicolor is high in biomass and strong in adaptability, the growth of sorghum bicolor is not influenced by caesium contamination, and the caesium content accumulated at the overground part of sorghum bicolor is higher than the caesium content accumulated at the roots. The method is friendly to environment, simple in operation and technology, convenient in manage, low in cost and good in restoration effect, provides a new choice for effective treatment of radioactive contaminated soil, and is applicable to the field of treatment on heavy-metal contaminated soil.

Description

technical field [0001] The invention relates to the technical field of environmental phytoremediation, in particular to a method for remediating cesium-contaminated soil by using crop sweet sorghum. Background technique [0002] The wide application of nuclear technology in many fields such as energy, scientific research, medical treatment, industry, agriculture, military affairs, transportation, medical care and health has brought about increasing nuclear pollution problems. These radioactive wastes pose great potential threats to the environment and public health. Disposing of these radioactive wastes has become a global problem. The long-lived nuclide cesium-137 in soil ( 137 Cs) is one of the important nuclides in radioactive dust and nuclear fuel waste, and its half-life is 30.17 years, and it is also one of the most dangerous radionuclides in biology. The migration speed of cesium in the soil is slow, and because it is similar to potassium of the same family, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 王建龙王旭陈灿
Owner TSINGHUA UNIV
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