Method for reducing bioavailability of soil with combined heavy metal pollution

A technology of compound pollution and soil biology, applied in the field of soil pollution control, can solve problems such as human health impact and air pollution, achieve the effects of improving the quality and safety of tobacco leaves, increasing the content of soil nutrient elements, and simple preparation process

Pending Publication Date: 2018-01-16
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, farmers generally directly use field incineration to dispose of tobacco ro

Method used

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  • Method for reducing bioavailability of soil with combined heavy metal pollution
  • Method for reducing bioavailability of soil with combined heavy metal pollution
  • Method for reducing bioavailability of soil with combined heavy metal pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Tobacco is one of the important economic crops in my country. The planting area and output both rank first in the world, with an annual planting area of ​​about 1.4 million ha 2 , The output of tobacco leaves is as high as 1.5-1.7 million tons, and about 1.5-1.7 million tons of tobacco rods will be produced accordingly. Tobacco stems are neither suitable for fuel, nor are they suitable for direct return to the field as fertilizer. A large number of tobacco stems are discarded or burned, which will not only cause a large number of germs to grow in the tobacco fields, but also seriously pollute the atmospheric environment. Therefore, strengthening the comprehensive utilization of resources such as tobacco stems and other agricultural wastes can not only effectively deal with the above-mentioned wastes and turn wastes into treasures, but also increase the economic income of tobacco farmers, thereby realizing the sustainable development of the tobacco industry.

[0027]Aimi...

Embodiment 2

[0049] Embodiment 2: biochar is applied to the reducing effect of lime soil heavy metal (Cd and Pb) effective state content:

[0050] In lime soil, the available content of soil heavy metals is generally expressed by the concentration of soil heavy metals leached by DTPA. With the increase of biochar application rate, the available content of heavy metals Cd and Pb in lime soil gradually decreased. When the weight ratios of biochar and composite polluted (Cd and Pb) soils were 1:100, 1:40 and 1:20, the reduction rates of available Cd in lime soil were 6.37%, 6.84% and 10.38%, respectively. ; The reduction rates of effective Pb in lime soil were 3.28%, 9.20% and 13.55%. Compared with the control (no carbon application), when the biochar application rate reached 1:20 (char / soil weight ratio), the available Cd content in soil decreased significantly (Pfigure 1 shown).

Embodiment 3

[0051] Embodiment 3, the reduction effect of biochar application on the residual amount of Cd in each organ of flue-cured tobacco:

[0052] With the increase of biochar application rate, the residual Cd in each organ of flue-cured tobacco (K326) decreased gradually. When the weight ratios of biochar and composite pollution (Cd and Pb) soil were 1:100, 1:40 and 1:20, the reduction rates of Cd residue in flue-cured tobacco roots were 2.48%, 4.04% and 14.59%, respectively; The reduction rates of residual Cd in flue-cured tobacco stems were: 15.51%, 6.52% and 23.12%; the reduction rates of residual Cd in flue-cured tobacco leaves were: 23.71%, 29.84% and 38.83%. Compared with the control (no charcoal application), when the biochar application rate reached 1:20 (charcoal / soil weight ratio), the Cd residue in flue-cured tobacco leaves was significantly reduced (P figure 2 shown).

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Abstract

The invention discloses a method for reducing the bioavailability of soil with combined heavy metal pollution. The method comprises the following steps: subjecting the soil with combined heavy metal pollution to air drying, sieving and preservation; with agricultural and forestry residues as raw materials, preparing biochar particles, and carrying out crushing, screening, air drying or stoving, and preservation; mixing the screened dried biochar particles and the soil with combined heavy metal pollution in a weight ratio of 1: 20 to 1: 100 under stirring, adding distilled water to allow the water content of the obtained mixture to reach 50 to 70% of field moisture capacity, and subjecting the mixture to standing for 5 to 7 days to allow the mixture to be fully decomposed so as to prepare achar-soil mixture with combined heavy metal pollution; and transplanting tobacco seedlings into the char-soil mixture by using a well cellar seedling transplanting method, uniformly filling the wellcellar with the mixture and allowing the growing points of the tobacco seedlings to main exposed. The method provided by the invention substantially reduces the available contents of Cd and Pb in thesoil with combined heavy metal pollution and lower absorption and enrichment of the heavy metals Cd and Pb by the roots, stems and leaves of crops; and the method has the advantages of low cost, highefficiency, simple operation and easy promotion and application.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a method for reducing the bioavailability of heavy metal complex polluted soil by using tobacco stem biochar. Background technique [0002] In recent years, with the intensification of industrial and urban pollution, the increase in the types and quantities of agricultural chemicals, and the continuous discharge of automobile exhaust and domestic waste, soil heavy metal pollution has become increasingly serious, which has become a key issue restricting sustainable development. Heavy metals in the soil can enter crops through various channels, pass through the food chain, and then accumulate in the human body, causing anemia, insanity, metabolic disorders, and even cancer, which pose a great threat to human health. At present, some vegetable, grain and flue-cured tobacco planting areas in my country are under the great threat of heavy metal pollution, an...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 程建中唐源陈懿高维常潘文杰李心清
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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