A method for safe regeneration and utilization of heavy metal contaminated soil after chemical leaching and remediation

A technology for chemical leaching and polluted soil, which is applied in the restoration of polluted soil, chemical instruments and methods, and other chemical processes, and can solve problems such as soil acidification and hardening

Active Publication Date: 2021-09-14
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current lack of safe recycling technologies and methods for soil after chemical leaching, the present invention proposes a method for safe recycling of heavy metal-contaminated soil after chemical leaching repair, which can solve the problem of soil acidification and hardening after chemical leaching Problems, reshape the soil aggregate structure, improve soil water retention and air permeability, supplement lost trace elements, effectively improve soil fertility, reduce the content of active heavy metals in the soil, so that the cultivated soil after chemical leaching can be recycled and safely produced.

Method used

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  • A method for safe regeneration and utilization of heavy metal contaminated soil after chemical leaching and remediation
  • A method for safe regeneration and utilization of heavy metal contaminated soil after chemical leaching and remediation
  • A method for safe regeneration and utilization of heavy metal contaminated soil after chemical leaching and remediation

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Experimental program
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Effect test

Embodiment 1

[0025] (1) The basic physical and chemical properties of the tested soil

[0026] The test soil was taken from the soil (0-20cm) of a Cd-contaminated farmland in Suxian District, Chenzhou City, Hunan Province, and the soil was naturally air-dried and passed through a 10-mesh sieve for later use. Accurately weigh 15kg of sieved soil into the rinsing container, add 0.05mol / L EDTA solution 150L with a solid-to-liquid ratio of 1:10, and strengthen the leaching under the action of ultrasonic waves (ultrasonic frequency is 25kHz, and the action time is 15min ). After the washing is completed, the washed farmland soil is obtained. The basic physical and chemical properties of the original contaminated soil and the soil after leaching are shown in Table 1.

[0027] Table 1 Basic physical and chemical properties of the tested soil

[0028]

[0029] (2) Implementation methods and steps

[0030] ①Clean the residual eluent. After chemical leaching, 15kg of soil was added to 300L o...

Embodiment 2

[0044] (1) The basic physical and chemical properties of the tested soil

[0045] The test soil was taken from the plow layer soil (0-20cm) of a heavy metal polluted paddy field in Liuyang City, Hunan Province, and the soil was naturally air-dried and passed through a 10-mesh sieve for later use. Take 30kg of sieved soil into the rinsing container, add 0.05mol / L leaching agent nitrilotriacetic acid solution 300L at a solid-to-liquid ratio of 1:10, and rinse for 4 hours at a speed of 100r / min. After the washing is completed, the paddy field soil after washing is obtained. The basic physical and chemical properties of the original contaminated soil and the soil after leaching are shown in Table 4.

[0046] Table 4 Basic physical and chemical properties of the tested soil

[0047]

[0048] (2) Implementation methods and steps

[0049] ①Clean the residual eluent. After rinsing, the soil was 30kg, and the soil was added to 600L of water at a solid-to-liquid ratio of 1:20, st...

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Abstract

The invention discloses a method for safe recycling of heavy metal-contaminated soil after chemical leaching repair, comprising: (1) Adding the cultivated land soil after chemical leaching to water at a solid-liquid ratio of 1:10-1:40 , after stirring, let stand and filter off the supernatant; (2) add the soil passivation agent to the soil treated in step (1) and plow, stir and mix evenly; (3) in the step (2) according to the mass percentage Apply 5-30% granular biochar to the treated soil, plow and mix well; (4) Apply 0.2-1.5% bio-organic fertilizer that has been fully fermented and decomposed by mass percentage, and plow and mix evenly; ( 5) The crop seeds or seedlings are planted in the soil treated in step (4), and the crops are continuously planted for one season or more. The method can remove the chemical leaching agent remaining in the soil after chemical leaching repair, increase the pH value of the soil, reshape the soil aggregate structure, improve the water retention and air permeability of the soil, effectively improve the soil fertility, and restore the planting function of the soil.

Description

technical field [0001] The invention belongs to the technical field of treatment and restoration of heavy metal-contaminated soil, in particular to a method for safe regeneration and utilization of heavy metal-contaminated soil after chemical leaching and restoration. Background technique [0002] Soil is the loose surface layer on the earth's surface that can sustainably grow plants. It is one of the most precious natural resources for human beings and an important part of the natural ecological environment. Cultivated land soil is the basic condition for farmers to carry out agricultural production and cultivation. The health status and nutrient content in the soil directly affect the growth of crops. Soil is a non-renewable resource, and it is estimated that it takes more than 1,000 years to form a 1cm thick soil layer. Therefore, the protection of cultivated soil is very important to food security. [0003] In recent years, due to the rapid development of industry and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/06C09K17/08C09K109/00
CPCB09C1/02B09C1/08B09C2101/00C09K17/06C09K17/08C09K2109/00
Inventor 周航廖柏寒辜娇峰李虹呈王倩倩张卫刘加力王勇坚侯晓丽
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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