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In-situ capturing treatment method for soil heavy metal pollution

A heavy metal and soil technology, applied in the restoration of polluted soil and other directions, can solve the problems of large impact of habitat conditions, long restoration period, unsuitable treatment of composite heavy metal contaminated soil, etc., and achieves recycling cost, fast processing speed, and reaction conditions. wide range of effects

Active Publication Date: 2016-06-22
SHENZHEN DUOYUAN TUOZHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Remediation of heavy metal-contaminated soil by planting hyperaccumulator plants is currently generally recognized as a low-cost restoration method that can effectively maintain soil ecological functionality. It has strong selectivity to heavy metals, and it is not suitable for treating compound heavy metal polluted soil

Method used

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  • In-situ capturing treatment method for soil heavy metal pollution

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Take six 1L beakers, add 1 kg of sieved 60-mesh copper, zinc, lead, and cadmium contaminated soil to each beaker, and mark 5 days, 10 days, 15 days, 20 days, 25 days, and 30 days respectively;

[0039] 2) Add water to each sample until the soil surface is completely wet, then add 50mL of 5mmol / L citric acid (soil heavy metal activator), and stir;

[0040] 3) In each beaker, 3 chelating capture fibers weighing 1g and 15cm in length are inserted vertically under the guidance of a glass rod according to the uniform distribution of the affected area;

[0041] 4) With 5 days as a chelation capture period, a 30-day chelation capture test is carried out. When the marking time is reached, the chelation capture fibers of the corresponding marked samples are taken out for heavy metal testing, and the rest of the samples are first chelated. Take out the capture fiber, add 50mL5mmol / L citric acid, stir the soil, and then re-insert the corresponding chelation capture fiber evenly...

Embodiment 2

[0047] 1) Take three 6L watertight soil basins with a height of 20cm, and add 5kg of copper, lead, and cadmium contaminated soil respectively;

[0048] 2) Transplant one grain amaranth with a height of 15 cm in each pot in the center of the pot;

[0049] 3) Distribute evenly in each pot according to the affected area, and use glass rods to guide and vertically insert 6 chelating capture fibers each weighing 1g and 15cm long;

[0050] 4) Add 200mL1mmol / L soil heavy metal activator EGTA, and add water until the soil surface is completely wet;

[0051] 5) Cultivate for 60 days indoors;

[0052] 6) Every 10 days, take a chelate capture fiber from each pot to measure the amount of heavy metal capture, and at the same time apply 200mL of 1mmol / L EGTA.

[0053] The average results of the soil pot test are shown in Table 2.

[0054] Table 2 Soil heavy metal chelation and capture results:

[0055]

[0056] After 60 days of chelation capture and plant extraction of heavy metal el...

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Abstract

The invention discloses an in-situ capturing treatment method for soil heavy metal pollution. The method comprises the steps of 1 deep ploughing and cleaning-up of soil, 2 burying of chelating capturing materials, 3 dry and wet adjustment, 4 soil heavy metal activation, 5 removing of the chelating capturing materials, 6 activating and recycling of the chelating capturing materials, 7 soil microelement supplementing and the like. According to the method, the chelating capturing materials are used for effectively removing water-soluble heavy metal, exchangeable heavy metal and part of carbonate-exchangeable heavy metal in soil, and the main route of soil heavy metal environmental risk transfer is effectively interdicted. The heavy metal chelating capturing materials adopted in the method can effectively treat trace metal pollution, high-concentration heavy metal pollution and multi-metal combined pollution, and the chelating capturing materials obtained after treatment can be activated and recycled. In addition, the method has the beneficial effects of being easy to operate, capable of being used in combination with other restoring methods easily, good in treatment effect, low in cost, free of secondary environmental risks and the like.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, in particular to an in-situ capture and control method for soil heavy metal pollution. Background technique [0002] Soil is a complex multiphase dynamic open system, mainly including solid phase, liquid phase, gas phase and biological phase. Soil ecological function is the embodiment of the dynamic process in which substances are interconnected and mutually restricted in the multiphase system of soil. A large amount of clay minerals and organic matter contained in the solid phase of the soil can effectively absorb various pollution factors entering its interior, and then accumulate in the soil. When the accumulation exceeds a certain amount, the output of the soil system will be directly or indirectly Harmful to human health, that is, soil pollution. [0003] The situation of soil heavy metal pollution in my country is quite serious. According to statistics from the Ministry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00
Inventor 潘胜强
Owner SHENZHEN DUOYUAN TUOZHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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