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A kind of treatment method of heavy metal polluted soil

A treatment method and technology for contaminated soil, applied in the field of treatment of heavy metal contaminated soil, can solve problems such as difficult acceptance by owners, reduced treatment efficiency, increased risk of secondary pollution, etc. Enhanced effect of washing treatment

Active Publication Date: 2022-07-08
FUJIAN LONGKING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, although the existing soil leaching technology can achieve the reduction of heavy metal-contaminated soil to a certain extent, there are still some problems: (1) The fine soil particles separated by the existing leaching technology are difficult to directly remove due to the high content of pollutants. On-site backfilling requires solidification / stabilization treatment, which not only increases the treatment cost, but also increases the risk of secondary pollution, so it is difficult to be accepted by the owner; (2) Due to human activities and weathering, the fine particle content of the soil When the content of fine particles increases, the permeability becomes poor, and when the content of fine particles exceeds 30wt%, the content of fine particles is too high, and the treatment efficiency is greatly reduced, so the existing leaching technology is difficult to apply to the treatment of soil with high fine particle content

Method used

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preparation example Construction

[0033] In the preparation step of the above-mentioned plant extract provided by the present invention, the plant parts to be extracted are first soaked in water. Wherein, the plant parts to be leached include but are not limited to one or more of pericarp, stem and leaf, preferably one or more of Sapindus japonica pericarp, green leaf and water hyacinth leaf; The plant parts to be extracted are preferably pulverized before soaking, and the particle size after pulverization is preferably ≤ 2 mm; the water consumption for soaking is preferably 2 to 50 times the plant mass, specifically 2 times, 2.5 times , 3 times, 3.5 times, 4 times, 4.5 times, 5 times, 5.5 times, 6 times, 6.5 times, 7 times, 7.5 times, 8 times, 8.5 times, 9 times, 9.5 times, 10 times, 15 times, 20 times times, 25 times, 30 times, 40 times or 50 times; the soaking temperature is preferably 5 to 35°C, specifically 5°C, 10°C, 15°C, 20°C, 25°C (room temperature), 30°C or 35°C; the soaking time is preferably 30-12...

Embodiment 1

[0044] The soil tested was from an industrial site in Zhangzhou. The soil was classified as yellow-brown soil, and the soil was heavily polluted by heavy metals. The sampling layer was the surface layer of 0-20cm, the soil pH was 5.33±0.25, and the CEC was 17.7cmol / kg; >0.074mm accounted for 40.01wt% , 0.074~0.002mm accounts for 48.40wt%; <0.002mm accounts for 11.59wt%, the total Cd content is 23.6±4.5mg / kg, and the moisture content is 20%, belonging to silty clay.

[0045] 1) Prepare plant extract:

[0046] Add Sapindus japonica peel into a pulverizer for pulverization to obtain fragments with a particle size of less than 2 mm; put the pulverized fragments into a leaching device, add water 10 times the plant mass, and soak at room temperature for 60 minutes; after soaking, fry Boil for 30 minutes, and then let stand for 2 hours; finally, solid-liquid separation is carried out in a centrifuge, the speed of the centrifuge is set to 4000 r / min, and the centrifugation time is 5 m...

Embodiment 2

[0054] The soil tested is from an industrial site in Longyan. The soil is classified as red loam, and the soil is heavily polluted by heavy metals. The sampling layer is 0-5m, the soil pH is 6.35±0.25, and the CEC is 8.48cmol / kg; >0.074mm accounts for 57.0wt%, 0.074 ~0.002mm accounts for 30.5wt%; <0.002mm accounts for 12.5wt%, the total Pb content is 600±14.5mg / kg, and the moisture content is 25%, belonging to silty clay.

[0055] 1) Prepare plant extract:

[0056] Add Sapindus japonica peel into a pulverizer for pulverization to obtain scraps with a particle size of less than 2 mm; the pulverized scraps are put into a leaching device, add water with 50 times the plant mass, and soak at room temperature for 30 minutes; after soaking, fry them. Boil for 40 minutes, then let stand for 2 hours; finally, solid-liquid separation is carried out in a centrifuge, the speed of the centrifuge is set to 3500 r / min, and the centrifugation time is 5 minutes.

[0057] The analysis of the e...

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Abstract

The invention belongs to the field of environmental protection, and in particular relates to a method for treating heavy metal polluted soil. The treatment method provided by the present invention comprises the following steps: a) mixing heavy metal-contaminated soil and plant extract, and granulating to obtain microspheres; the plant extract contains carboxyl groups, hydroxyl groups and polycyclic hydrocarbon groups; b) mixing The microspheres are piled up to obtain a microsphere pile; c) the microsphere pile is rinsed to obtain the treated soil. The treatment method provided by the invention fills the technical gap that the current high-fine-grained soil is difficult to wash and treat, and only needs simple granulation, pile building and spraying to realize the treatment of heavy metal polluted soil. This method does not need to use high-end crushing and screening equipment, solid-liquid separation equipment, and does not need to consider the solidification / stabilization treatment and backfilling of soil fine particles. benefit.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for treating heavy metal polluted soil. Background technique [0002] Soil leaching refers to the process of injecting or infiltrating the leachate into the soil, making it flow through the soil layer to be treated, analyzing the pollutants in the soil, and then treating and reusing the leachate containing the pollutants. This technology can be used for the treatment or pretreatment of soil contaminated by radioactive substances, organic substances, heavy metals or other inorganic substances. [0003] The existing leaching technology has two main mechanisms: (1) Separation of coarse particles (particle size > 0.074mm) and fine particles (particle size ≤ 0.074mm) soil. Since the pollutants tend to be distributed in the fine-grained soil, the coarse-grained soil with the pollutant concentration lower than the remediation target value after leaching i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02
Inventor 胡杰华肖尧钟安良何苏祺吴丹霞陈俊华郭丹花
Owner FUJIAN LONGKING
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