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A method for permanently removing effective heavy metals in heavy metal-polluted soil

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, etc., to achieve high removal rate, reduced treatment cost, and high specific surface area

Active Publication Date: 2019-01-29
HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the defects in the existing methods for remediating or treating heavy metal pollution in soil, the purpose of the present invention is to provide a method that can efficiently and permanently remove heavy metals in the soil, realize the recovery of heavy metals in the soil, and do not destroy the original ecological structure of the soil. A method that causes secondary pollution, the method is simple to operate, low in cost, and easy to be popularized and applied on a large scale

Method used

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  • A method for permanently removing effective heavy metals in heavy metal-polluted soil
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  • A method for permanently removing effective heavy metals in heavy metal-polluted soil

Examples

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Effect test

Embodiment 1

[0048] 1. Select a heavy metal cadmium-contaminated farmland soil with an effective cadmium concentration of 0.47mg / kg, build a field ridge cofferdam around the farmland, the height of the field ridge is about 35cm, add water to the cofferdam, so that the water level of the plot soil is about 20cm;

[0049] 2. Keep the water temperature at 20°C, add citric acid to the water to make the concentration reach 18mmol / L, plow the soil in the plot with a rotary tiller, the plowing depth is about 20cm, and let it settle.

[0050] 3. Divide the nanoporous ceramic composite material MA01 into nylon mesh bags according to 50 g / bag, then hang the nylon mesh bags on nylon ropes at intervals of 0.5m, straighten multiple ropes, and press 0.5m Place them in the field in parallel at intervals so that the field is filled with nylon mesh bags filled with MA01 particles. After 3 hours of adsorption treatment, take out the nylon mesh bags; if the heavy metal ions adsorbed by MA01 reach saturation, ...

Embodiment 2

[0053] 1. Select a farmland polluted by heavy metal cadmium, and the available cadmium content in the farmland soil is 1.24mg / kg. Stack the field ridge cofferdam around the plot, the height of the field ridge is about 30cm, add water to the cofferdam, so that the water level of the plot soil is about 16cm;

[0054] 2. Keep the water temperature at 25°C, add citric acid and ammonium nitrate (molar ratio 1:1) to the water to make the concentration reach 10mmol / L, and plow the soil in the plot with a rotary tiller, and the plowing depth is about 20cm That's it, let it settle down.

[0055] 3. Divide the nanoporous ceramic composite material MA01 into 50 g / bag with nylon mesh bags, then hang the nylon mesh bags on nylon ropes at intervals of 0.75m, straighten multiple ropes, and press 1m Place them in parallel at intervals so that the field is filled with nylon mesh bags filled with MA01 particles. After adsorption treatment for 6 hours, take out the nylon mesh bags; if the heavy...

Embodiment 3

[0058] 1. Select a heavy metal cadmium and lead-contaminated soil with an effective cadmium content of 0.81mg / kg, build a field ridge cofferdam around the plot, the height of the field ridge is about 35cm, add water to the field plot, so that the water level of the plot soil is about 25cm ;

[0059] 2. Keep the water temperature at 30°C, and plow the soil in the plot with a rotary tiller. The plowing depth should be about 20cm, and let it settle.

[0060] 3. Make nanoporous ceramic composite material MA01 into cuboid bricks of 5cm×3cm×2cm, place the bricks evenly in the cofferdam at a vertical and horizontal interval of 1m, and take out the bricks after adsorption treatment for 5 hours. If the heavy metal ions adsorbed by MA01 When it reaches saturation, MA01 can be eluted with 2.5% EDTA by mass percentage to recover metal cadmium. The adsorption capacity of MA01 after regeneration can reach 95% of the original material, which can be reused. If the adsorbed heavy metal ions ar...

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Abstract

The invention discloses a method for removing effective-state heavy metal in heavy metal contaminated soil permanently. The method includes the steps that a field ridge cofferdam is built on the periphery of a heavy metal contaminated field, water is added into the cofferdam, soil of the field in the cofferdam is ploughed to enable muddy water to be fully mixed, and then the muddy water is clarified after standing; nanometer porous ceramic composites are evenly arranged in the cofferdam to carry out adsorption treatment on heavy metal ions in the water, the nanometer porous ceramic composites are taken out, and the heavy metal is recovered; and plough and adsorption are repeated, then the remediated field is obtained, and normal planting can be conducted. By means of the method, the heavy metal in the soil can be removed efficiently and permanently, recovery of the heavy metal in the soil can be achieved, the original ecological structure of the soil is not damaged, and secondary pollution is avoided; operation is simple, cost is low, and the method can be easily applied and popularized in a large scale.

Description

technical field [0001] The invention relates to a method for permanently removing effective heavy metals in heavy metal-polluted soil, in particular to a method for repairing heavy metal pollution in farmland soil; it belongs to the technical field of soil heavy metal pollution control. Background technique [0002] my country is a country with a long history of heavy metal development. After the founding of New China, due to the needs of social and economic development, the development and utilization of heavy metal minerals has developed rapidly. Especially in recent years, my country's heavy metal production and demand for mineral products have grown rapidly, and the resulting pollution problems have become increasingly serious. my country's heavy metal pollution is gradually accumulated in the long-term mining, processing and industrialization process. Heavy metal pollution not only seriously affects soil quality and quantity, but also causes huge economic losses. Altho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C2101/00
Inventor 奉向东王健赵铁程坤戴佰林周磊江幸
Owner HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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