Method for remediating acid/heavy metal cadmium composite polluted soil by using Pennisetum hydridum

A technology of complex pollution and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of high cost, soil structure damage, large engineering volume, etc., and achieve the effect of simple planting management, rapid growth, and small engineering volume

Inactive Publication Date: 2013-11-27
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for remediating acid and heavy metal cadmium compound pollution by using scorpion grass in view of the shortcomings of the exi

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0024] Example 1:

[0025] The emperor bamboo grass was tested in the acid and heavy metal cadmium compound contaminated soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68 mg / kg. Starting from November 2010, no additives were applied to the soil, and then low ridges were raised, plowing to plant emperor grass, and the planting work was completed on March 15, 2011. The planting density specification of king bamboo grass is 80cm×50cm. During the growth period, no irrigation and fertilization are performed, and weeds in the field are manually removed, and harvested until the end of November 2011. The harvested king bamboo grass is ashed according to the conventional method, and heavy metals are extracted to obtain heavy metal cadmium and fertilizer. After one harvest, the purification rate of cadmium in the soil is 0.09mg / kg. Since the number of cuttings in this example is only one of the final harvest, according to normal planting measures, its biomass...

Example Embodiment

[0026] Example 2:

[0027] The emperor bamboo grass was tested in the acid and heavy metal cadmium compound contaminated soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68 mg / kg. Starting in December 2010, no additives were applied to the soil, and then low-ridge, plowing and planting emperor bamboo grass, and the planting work was completed on March 10, 2011. The planting density of King bamboo grass is 75cm×50cm. During the growth period, there is no irrigation, and the biogas slurry is fertilized every 2 months to manually remove the weeds in the field. The harvest will be carried out by the end of November 2011. The harvested king bamboo grass is ashed according to the conventional method, and heavy metals are extracted to obtain heavy metal cadmium and fertilizer. After one harvest, the purification rate of cadmium in the soil is 0.09mg / kg. Since the number of cuttings in this example is only one of the final harvest, according to normal plantin...

Example Embodiment

[0028] Example 3:

[0029] The emperor bamboo grass was tested in the acid and heavy metal cadmium compound contaminated soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68 mg / kg. Beginning in November 2010, lime-sodium hydroxide and organic fertilizers were used as additives in the soil. 500kg lime and 250kg sodium hydroxide were added per acre of polluted farmland. The same amount of lime and sodium hydroxide was applied again on the eighth day. For fifteen days, silkworm excrement was applied at an amount of 2000kg / mu. The low ridges were raised in February 2011, and the emperor bamboo grass was plowed and planted. The planting work was completed on March 5, 2011. The planting density specification of king bamboo grass is 80cm×50cm. During the growth period, there is no irrigation, and the biogas slurry is fertilized every 2 months to manually remove the weeds in the field. The harvest will be carried out by the end of November 2011. The harvested ...

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Abstract

The invention discloses a method for remediating acid/heavy metal cadmium composite polluted soil by using Pennisetum hydridum. The method comprises the following steps: plowing polluted soil, and planting Pennisetum hydridum in low ridges from March, wherein irrigation and fertilizer application are performed or not performed in the complete growing season; and three months after planting, starting reaping the aerial part of Pennisetum hydridum once a month, incinerating the reaped substance by a conventional method, and extracting the heavy metal and fertilizer, thereby achieving the goal of remediating acid/heavy metal cadmium composite polluted soil. Pennisetum hydridum is a perennial herb; and by continuously planting the Pennisetum hydridum on the heavy metal cadmium polluted soil and continuously reaping the aerial part, the heavy metal cadmium in the soil is continuously extracted and transferred, and the pH value of the soil is changed until the soil achieves the environmental safety standard. The Pennisetum hydridum, which has the advantages of high biomass of the aerial part and developed root system, can absorb and fix abundant heavy metals, can retain water and protect soil, enhances the green level of the polluted area, and has favorable economic benefit, social benefit and ecological effect.

Description

technical field [0001] The invention relates to a repair technology for heavy metal pollution in the environment, in particular to a method for repairing compound polluted soil by acid and heavy metal cadmium by using royal bamboo grass. Background technique [0002] Farmland soil pollution has become one of the important factors restricting the sustainable development of agriculture and food safety. In 2001, the Huanjiang Maonan Autonomous County of Guangxi Autonomous Region suffered a once-in-a-century flood disaster, which caused the solid waste of the beneficiation plants in the Beishan, Yamai, and Duchuan areas to flow into the Dahuan River with the flood, and about 80,000 to 10,000 cubic meters of tailings and sulfur The iron powder was washed into the river, causing serious pollution to the farmland soil along the river in Luoyang, Da'an and Si'en townships. Substances such as lead-zinc ore tailings and sulfur iron powder enter the soil of the project area to cause s...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 谢华吴昊廖晓勇余孟好狄瑜
Owner SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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