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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, damage to soil structure, and large amount of engineering, and achieve the effects of simple planting management, rapid growth, and small engineering amount.

Inactive Publication Date: 2015-01-07
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 existing technical methods for remediating acid and heavy metal cadmium compound polluted soil, such as large amount of engineering, high cost, and easy to cause soil structure damage. soil method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The emperor bamboo grass was tested in acid and heavy metal cadmium composite polluted soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68mg / kg. Beginning in November 2010, no additives were applied to the soil, and then low ridges were raised, plowed and planted with imperial bamboo grass, and the planting work was completed on March 15, 2011. The planting density of imperial bamboo grass is 80cm×50cm. During the growth period, no irrigation and fertilization were performed, and field weeds were manually removed, and the harvest was carried out until the end of November 2011. Ashing the reaped royal bamboo grass according to the conventional method, extracting heavy metals, and obtaining heavy metal cadmium and fertilizer. After a harvest, the purification rate of the heavy metal cadmium in the soil is 0.09mg / kg; since the number of cuttings in this example is only the final harvest, according to normal planting measures, its biomass can rea...

Embodiment 2

[0027] The emperor bamboo grass was tested in acid and heavy metal cadmium composite polluted soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68mg / kg. From December 2010, no additives were applied to the soil, and then low ridges were plowed to plant imperial bamboo grass. The planting work was completed on March 10, 2011. The planting density of imperial bamboo grass is 75cm×50cm. No irrigation was used during the growth period, biogas slurry was fertilized every 2 months, field weeds were manually removed, and the harvest was carried out until the end of November 2011. Ashing the reaped royal bamboo grass according to the conventional method, extracting heavy metals, and obtaining heavy metal cadmium and fertilizer. After a harvest, the purification rate of the heavy metal cadmium in the soil is 0.09mg / kg; since the number of cuttings in this example is only the final harvest, according to normal planting measures, its biomass can reach the level...

Embodiment 3

[0029]The emperor bamboo grass was tested in acid and heavy metal cadmium composite polluted soil with a pH value of 3.0 and an average heavy metal cadmium content of 0.68mg / kg. Beginning in November 2010, lime-sodium hydroxide and organic fertilizer were applied as additives in the soil, and 500kg of lime and 250kg of sodium hydroxide were added per mu of polluted farmland, and the same amount of lime and sodium hydroxide was applied again on the eighth day. Apply silkworm excrement by the amount of 2000kg / mu in 15 days, start low ridge in February 2011, plow and plant imperial bamboo grass, and complete the planting work on March 5, 2011. The planting density of imperial bamboo grass is 80cm×50cm. No irrigation was used during the growth period, biogas slurry was fertilized every 2 months, field weeds were manually removed, and the harvest was carried out until the end of November 2011. Ashing the reaped royal bamboo grass according to the conventional method, extracting he...

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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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Patent Type & Authority Patents(China)
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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