Combined restoration method for heavy metal polluted farmland soil

A composite repair and heavy metal technology, applied in the restoration of polluted soil, etc., can solve the problems of high manpower and financial resources, unfavorable popularization and application, and reduced soil fertility, etc., to achieve reduced repair costs, strong ion exchange capacity, and good results Effect

Active Publication Date: 2018-11-23
湖南慧谷农业生态研究院有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The first four methods are relatively traditional control methods. Although they have achieved certain results in practical applications, they have defects such as large manpower and financial resources, complex implementation, high control costs, and easy reduction of soil fertility, which are not conducive to large-scale promotion. application

Method used

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  • Combined restoration method for heavy metal polluted farmland soil
  • Combined restoration method for heavy metal polluted farmland soil
  • Combined restoration method for heavy metal polluted farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) For farmland soil polluted by heavy metals, 10 days before plowing, apply 50-200kg of heavy metal passivation agent per mu, plow and mix well, and plow the soil to a depth of about 10-30cm;

[0060] (2) Select high-quality soybean Zhongdou 41 seeds, and plant soybeans in spring, with a seeding rate 3 ; Normal management of soybean growth process; soybean straw recycling after harvesting soybeans in summer;

[0061] (3) Before the farmland soil after the soybean harvest is cultivated, apply 50-200kg of heavy metal passivation agent per mu, plow and mix well, and the plow depth is about 10-30cm;

[0062] (4) Select No. 9 seeds of rape heza which are resistant to bolting, full of grains, and free of diseases and insect pests, and sow in autumn with a seeding rate 3 ; Rapeseed growth process is normally managed; after the rapeseed is harvested, the rapeseed straw is recycled.

[0063] (5) According to the planting method (1)-(4), the test will be carried out after two y...

Embodiment 2

[0077] Heavy metal activator production method:

[0078] (1) Rice straw is crushed through a 20-mesh sieve, added to 4% NaOH solution at a weight ratio of 1:10, heated at 100°C for 30 minutes, filtered, the filter residue is taken, washed with water until neutral, and dried at 105°C to obtain delignification straw.

[0079] (2) Add 5% urea of ​​the weight of the delignified straw to the delignified straw, carry out composting and fermentation to maturity, add 2% rapeseed meal of the weight of the delignified straw after fermentation, and add Bacillus with phosphorus-solubilizing function, The Rhizopus and Aspergillus make the concentration of the heap to reach 0.1 billion cfu / g, carry out the secondary fermentation for 10 days, and obtain straw bio-organic fertilizer after the end.

[0080] (3) Add 5% oxalic acid by organic fertilizer weight to straw bio-organic fertilizer and mix to prepare heavy metal activator.

[0081] After the composite restoration of Example 1, when t...

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Abstract

The invention provides a combined restoration method for heavy metal polluted farmland soil. The combined restoration method for the heavy metal polluted farmland soil comprises the specific steps that (1) heavy metal passivant is spread before tillage, and the farmland is evenly tilled; (2) soybeans are planted in spring and summer, and after harvesting, soybean straws are recycled; (3) heavy metal passivants are spread, and the farmland is evenly tilled; (4) rape is planted in autumn and winter, and after harvesting, rape stalks are recycled. According to the combined restoration method forthe heavy metal polluted farmland soil, rotation and united plantation of the soybeans and the rape are adopted, the heavy metal passivant is adopted to achieve passivation of heavy metals, the intimidation of heavy metal in soil to the crops is lowered, and meanwhile the heavy metals are continuously absorbed; and therefore, the efficiency of combined restoration is improved, and a combined restoration method which is easy to implement, environmentally friendly and economical is provided for restoration of the heavy metal polluted farmland soil.

Description

technical field [0001] The invention relates to the technical field of heavy metal-contaminated farmland restoration, in particular to a composite restoration method for heavy metal-contaminated farmland soil. Background technique [0002] Soil is the main material basis for human survival. With the acceleration of industrialization and urbanization, soil heavy metal pollution is becoming more and more serious, including cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), zinc (Zn), mercury (Hg), arsenic (As ), nickel (Ni), etc. are more common heavy metal pollution. On average, 5 million tons of Pb, 3.4 million tons of Cu, about 15,000 tons of Hg, 15 million tons of Mn, and 1 million tons of Ni are discharged every year in the world, which seriously pollutes the environment. In my country, about 25 million hectares of farmland soil is polluted by heavy metals, and 12 million tons of grains are polluted by heavy metals every year, causing direct economic losses of more th...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 谭石勇文亚雄谭武贵郭帅李雪玲张冬雪
Owner 湖南慧谷农业生态研究院有限公司
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