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Method for removing heavy metal copper in soil by using plants

A heavy metal and soil technology, applied in the field of soil heavy metal pollution control, can solve the problems of not being degraded by microorganisms, not easy to leach with water, and potentially harmful

Inactive Publication Date: 2012-07-25
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Heavy metal pollutants have little mobility in the soil, are not easily leached with water, are not degraded by microorganisms, and have great potential harm after entering the human body through the food chain

Method used

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with specific embodiments.

[0013] Apply the method of the present invention to test in the soil near the Lantian smelter. The Lantian smelter is located in Chengou'an Village, Sanli Town, Lantian County, Shaanxi Province. It was built in 1991 and is engaged in crude lead production. The annual output is 2000t. The soil quality is heavy clay, PH The value is 7.8-8.2, and the average copper content in the 0-20cm plow layer soil within 200m away from the smelter is 239mg / kg. In March 2010, tall fescue and white clover were planted horizontally and horizontally on the farmland of Chengou'an Village, 233-278m ​​away from the smelter (originally planted with winter wheat), about 1320m away. 2 , the sowing method is drill, the row spacing of the drill is 30cm, the soil depth is 1cm, and the seeding rate is 47.2g / m 2 and 0.78g / m 2 , loosen the soil and weed once after emergence, irrigate once in April, a...

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Abstract

The invention discloses a method for removing heavy metal copper in soil by using plants. The method comprises the following steps: (1) determining a region polluted by the heavy metal copper and the copper content in the soil through monitoring, and sowing and planting Festuca arundinacea or Trifolium repens or interplanting Festuca arundinacea and Trifolium repens in the soil of the polluted region where the concentration of the heavy metal copper is less than or equal to 1,000mg / kg according to climate and soil suitability; (2) carrying out row sowing or broadcast sowing in the soil of horizontal regions, and carrying out horizontal transverse row sowing on slopes; and (3) carrying out continuous planting for gradually reducing the content of the heavy metal copper in the soil till the content of the heavy metal copper in the soil reaches the soil quality standard through monitoring. The reaped plants are ground, dried in the sun and centralized burned, and the heavy metal copper can be extracted from ashes of the burned plants so as to convert pollutants to resources.

Description

technical field [0001] The invention relates to the field of treatment of soil heavy metal pollution, in particular to a restoration technology for removing or alleviating heavy metal copper (Cu) pollution in soil by using plants. Background technique [0002] Soil heavy metal pollution refers to the high content caused by excessive deposition of trace harmful elements in soil exceeding the background value due to human activities, collectively referred to as soil heavy metal pollution. Heavy metals in polluted soil mainly include elements with significant biological toxicity such as cadmium, mercury, lead, chromium, and metalloid arsenic, as well as elements with certain toxicity such as zinc, copper, and nickel. Mainly come from pesticides, wastewater, sludge and atmospheric deposition, etc. For example, cadmium and lead pollution mainly come from smelting emissions and vehicle exhaust gas deposition, mercury mainly comes from mercury-containing wastewater, and arsenic is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 贾锐鱼赵晓光程爱华
Owner XIAN UNIV OF SCI & TECH
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