Ecological blanket for fixing heavy metal and method of removing heavy metal in soil through combination of ecological blanket and phytoremediation

An ecological blanket and heavy metal technology, applied in the restoration of polluted soil, etc., can solve the problems of secondary pollution, long repair time, low biomass, etc., and achieve enhanced adsorption and treatment capacity, improved adsorption capacity, and high removal efficiency Effect

Active Publication Date: 2018-06-12
GUANGDONG DONGLEE ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, chemical fixation and phytoremediation still have some disadvantages
The chemical fixation method can only passivate heavy metals, but cannot remove them from the soil. The fixation effect of the modifier on heavy metals will be affected by soil environmental factors, such as soil moisture, pH, soil type, heavy metal type, etc. When these factors change When, the solidified heavy metals may be reactivated or transformed, resulting in secondary pollution
Phytoremediation has the disadvantages of long repair time and low biomass, and the repair period for heavy metal-contaminated soil is too long, so it has not been widely used
However, the chemical fixation method can passivate the heavy metals in the rhizosphere soil of plants, and inhibit the absorption of heavy metals by hyperaccumulative plants to a certain extent. Therefore, the combination of chemical fixation and phytoremediation often fails to achieve the combined effect.
At present, there are no literature reports on the combination of the two to achieve the desired effect

Method used

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  • Ecological blanket for fixing heavy metal and method of removing heavy metal in soil through combination of ecological blanket and phytoremediation
  • Ecological blanket for fixing heavy metal and method of removing heavy metal in soil through combination of ecological blanket and phytoremediation
  • Ecological blanket for fixing heavy metal and method of removing heavy metal in soil through combination of ecological blanket and phytoremediation

Examples

Experimental program
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Effect test

Embodiment 1

[0035](1) Preparation of interlayer zeolite: Add natural zeolite to 0.5mol / L NaCl solution, shake in a water bath at a constant temperature of 80°C for 5 hours, centrifuge and wash with deionized water; add the washed zeolite to 0.1 Treat in mol / L hydrochloric acid for 24 hours, wash with deionized water until neutral, shake at 160rpm at a constant temperature of 25°C for 30min, put the modified zeolite in an oven after cleaning, dry at 105°C for 2h; roast at 460°C for 3h, cool to room temperature, washed with deionized water, filtered, and dried at 105°C for 5 hours to obtain Na-type-acid-heat-treated modified zeolite with strong adsorption.

[0036] (2) Preparation of ecological blanket 1: two layers of polypropylene staple fiber needle-punched nonwoven geotextiles (purchased from Dezhou Xibei New Material Co., Ltd., product specification: SNGPP100) are laminated, and polyester filament spunbonded geotextiles are used on the upper and lower sides. Cloth (purchased from Dongg...

Embodiment 2

[0038] (1) Preparation of interlayer zeolite: Add natural zeolite to 1mol / L NaCl solution, shake in a water bath at a constant temperature of 80°C for 5 hours, centrifuge and wash with deionized water; add the washed zeolite to 0.3mol / L hydrochloric acid for 24 hours, washed with deionized water until neutral, oscillating at 160rpm at a constant temperature of 25°C for 30min, after cleaning, put the modified zeolite in an oven, dry at 105°C for 2h; roast at 450°C for 3h, and cool to At room temperature, wash with deionized water, filter, and dry at 105°C for 5 hours to obtain Na-type-acid-heat-treated modified zeolite with strong adsorption.

[0039] (2) Preparation of ecological blanket 2: Laminate two layers of polypropylene staple fiber needle-punched nonwoven geotextiles, cover the outer layer with polyester filament spunbonded geotextiles up and down, sew the edges of the four layers of geotextiles together, and the middle layer The modified zeolite prepared by filling s...

Embodiment 3

[0041] (1) Preparation of interlayer zeolite: Add natural zeolite to 1mol / L NaCl solution, shake in a water bath at a constant temperature of 80°C for 5 hours, centrifuge and wash with deionized water; add the washed zeolite to 0.3mol / L hydrochloric acid for 24 hours, washed with deionized water until neutral, oscillating at 160rpm at a constant temperature of 25°C for 30min, after cleaning, put the modified zeolite in an oven, dry at 105°C for 2h; roast at 450°C for 3h, and cool to At room temperature, wash with deionized water, filter, and dry at 105°C for 5 hours to obtain Na-type-acid-heat-treated modified zeolite with strong adsorption.

[0042] (2) Preparation of the middle layer adsorption material: inoculate phosphate solubilizing bacteria (purchased from Guangdong Institute of Microbiology) on hydroxyapatite (purchased from Shanghai Kanglang Biotechnology Co., Ltd., CAS number: 1306-06-5, heavy metal: ≤ 0.001%), mixed with the Na type-acid-heat-treated modified zeoli...

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PUM

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Abstract

The invention relates to the technical field of regeneration of contaminated soil, in particular to an ecological blanket for fixing heavy metal and a method of removing heavy metal in soil through the combination of the ecological blanket and phytoremediation, and provides the ecological blanket for fixing heavy metal and the method of removing heavy metal in soil through the combination of the ecological blanket and phytoremediation. The ecological blanket comprises a modified zeolite middle layer, an inner permeable geotextile layer and an outer permeable geotextile layer, wherein the innerpermeable geotextile layer and the outer permeable geotextile layer wrap the zeolite middle layer. The ecological blanket is buried below the surface soil of farmland contaminated by heavy metal, hyperaccumulators are planted on the surface soil, heavy soil ions are promoted to downwards transfer along with solutions in the irrigation process, and finally remediation of the soil contaminated by heavy metal is achieved through removal of the ecological blanket and harvesting of the hyperaccumulators. The ecological blanket and the method achieve the effective combination effect of a chemical fixation method-phytoremediation technology, and are high in efficiency of removing lead, zinc and cadmium in soil.

Description

technical field [0001] The invention relates to the technical field of regeneration of polluted soil, in particular to an ecological blanket for immobilizing heavy metals and a method for removing soil heavy metals in combination with phytoremediation. Background technique [0002] Soil heavy metal pollution has the characteristics of long-term, hysteresis, and accumulation. It can enter the food chain through various channels to accumulate and amplify, and then threaten human health. The heavy metal pollution of farmland soil in my country is complex and the scope of pollution is wide. It is urgent to develop a repair method with simple operation, fast effect and low cost. [0003] At present, the common methods of treating heavy metal-contaminated soil include: engineering treatment methods, such as foreign soil, soil replacement, etc.; physical restoration methods, such as electrothermal restoration method, vitrification technology, electric restoration technology, etc.; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/105B09C2101/00
Inventor 邹富桢徐辉徐斌余江勇金生英
Owner GUANGDONG DONGLEE ENVIRONMENT CO LTD
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