Method for repairing heavy metal polluted soil based on permeation absorption wall

A technology of polluted soil and heavy metals, which is applied in the field of remediation of heavy metal-contaminated soils, can solve the problems of low efficiency of engineering treatment, and achieve the effect of obvious energy-saving advantages, obvious effects, and low energy consumption

Inactive Publication Date: 2017-05-10
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned reaction wall does not involve the promotion of heavy metal leaching in contaminated soil and the improvement of the removal efficiency of mobile heavy metals. The restoration of soil depends more on the natural migration process of heavy metals, and the efficiency of engineering treatment is low.

Method used

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  • Method for repairing heavy metal polluted soil based on permeation absorption wall
  • Method for repairing heavy metal polluted soil based on permeation absorption wall
  • Method for repairing heavy metal polluted soil based on permeation absorption wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Soil digestion process

[0047] Using "S" type sampling, select the upper, middle and lower positions of the soil before and after leaching for sampling, and dry the collected samples at 120 °C. After drying, use a grinder and a vibrating sieve to pass the soil through 80 meshes. Accurately weigh 0.100g of soil, add 5mL of concentrated nitric acid and 1mL of hydrofluoric acid, and microwave for 30min at 700W and 150°C. When it is cooled to room temperature, put the digestion tube into a water bath to heat, and carry out acid removal treatment on the digestion liquid. Afterwards, the liquid in Xiaoye’s tube was diluted to 10mL, and 0.1mL was taken to dilute to 10mL. Sampling was repeated 3 times, pending detection and processing.

Embodiment 2

[0049] ICP / AES detection of heavy metals

[0050] Draw 0, 0.1, 0.2, 0.3, 0.4 and 0.5mL of 26 mixed standard solutions of 1μg / mL, dilute to 50mL with 1% nitric acid solution respectively, shake well, stand for 30min for measurement, draw copper, zinc, lead, chromium , cadmium, and arsenic standard curves, the concentrations of copper, zinc, lead, chromium, cadmium, and arsenic in the standard curves are 0, 2.0, 4.0, 6.0, 8.0, and 10 μg / mL, respectively.

[0051] In the same way, with the mercury standard solution, the standard curve of mercury can be drawn, and the standard curve contains mercury 0, 2.0, 4.0, 6.0, 8.0, 10 μg / mL.

[0052] The content of heavy metals can be obtained by direct detection of soil samples, permeate, and washing liquid after decontamination treatment.

Embodiment 3

[0054] (1) Construction of infiltration adsorption wall

[0055] The total amount of adsorption materials in the osmotic adsorption wall is calculated as 200kg, and the quality of binder and water is not included in it. The ratio of adsorption materials is as follows:

[0056]

[0057] Mix well at room temperature, and prepare the adsorption material into an adsorption brick of 20cm×10cm×3cm by extrusion molding. Keep the humidity at 80%, dry at 120°C for 6h, and at 550°C for 2h. After cooling to room temperature, the adsorption bricks are fixed and stacked with stainless steel frames to form permeable adsorption walls of different sizes and specifications, and spliced ​​by permeable adsorption bricks to form a 0.8m 3 The left and right cuboids are not capped. The bottom layer is paved with foam plastic, and the four sides of the cuboid are spliced ​​by two permeable adsorption walls, and the distance between the two adsorption walls is 10cm.

[0058] (2) Soil washing

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Abstract

The invention relates to a method for repairing heavy metal polluted soil based on a permeation absorption wall. The method specifically comprises the steps of: construction of the permeation absorption wall, soil leaching, heavy metal enrichment, regeneration of the permeation absorption wall, and heavy metal recovery. Compared with the prior art, the used permeation absorption wall is a movable assembled permeation absorption wall built by absorption bricks, which are produced through a forming process by adding a binding agent in such absorption materials as fly ash, clay and molecular sieves; the permeation absorption wall is spliced as cuboids with different specifications; and the method is combined with a chemical leaching method to exert the effects of leaching, absorption and heavy metal enrichment, can be used for a soil ectopia repair engineering technology, protects underground water, and shortens the soil repair treatment period. The method combines a physical method with a chemical method, is cheap in raw materials, easy to obtain the raw materials and low in operation cost, treats wastes by wastes, is short in soil treatment period, is obvious in energy saving advantages, and is broad in application prospect.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and relates to a method for remediating heavy metal-contaminated soil based on an infiltration adsorption wall. Background technique [0002] Soil heavy metal pollution has the characteristics of long residence time, strong pollution concealment, inability to be degraded by microorganisms, and can accumulate in organisms through the food chain, and eventually accumulate in the human body to endanger human health. Therefore, soil heavy metal pollution has attracted increasing attention. . How to effectively control, control and restore soil heavy metal pollution has become the primary task of my country's current soil ecological protection work. [0003] At present, soil heavy metal pollution treatment methods are mainly divided into engineering remediation and biological remediation. Engineering remediation of heavy metal-contaminated soil is usually divided...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 胡杰徐华胜夏思奇王鹏飞顾艳余金鹏
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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