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A kind of restoration method of pfass polluted wetland

A remediation method and wetland technology, applied in the field of remediation of PFASs-contaminated wetlands, can solve the problems of difficult operation and poor effect, and achieve the effects of excellent effect, enhanced enrichment, and good adsorption.

Active Publication Date: 2022-01-07
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the removal technologies of PFASs mainly include adsorption and degradation technologies. Common PFASs degradation methods include Fenton reaction, photochemical oxidation / catalysis, persulfate, and electro / photoelectrochemical degradation. However, the above degradations are generally carried out under harsh conditions. Difficult to operate
The commonly used materials for adsorption are activated carbon, ion exchange resin, etc. However, granular activated carbon and ion exchange resin are less effective in removing short-chain PFASs

Method used

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  • A kind of restoration method of pfass polluted wetland
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  • A kind of restoration method of pfass polluted wetland

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preparation example Construction

[0026] In the present invention, the preparation method of the LDHs preferably comprises the following steps:

[0027] Mixing a divalent water-soluble salt, a trivalent metal water-soluble salt and water to obtain a mixed metal ion solution;

[0028] The mixed metal ion solution is mixed with ammonia water for aging to obtain LDHs.

[0029] The invention mixes divalent water-soluble salt, trivalent metal water-soluble salt and water to obtain mixed metal ion solution. In the present invention, the divalent water-soluble salt preferably includes Mg(NO 3 ) 2 , MgSO 4 , Mg(CH 3 COO) 2 , MgF 2 , MgCl 2 , Mn(NO 3 ) 2 , MnSO 4 , Mn(CH 3 COO) 2 , MnF 2 , MnCl 2 , Fe(NO 3 ) 2 , FeSO 4 , Fe(CH 3 COO) 2 , FeF 2 , FeCl 2 , Co(NO 3 ) 2 、CoSO 4 , Co(CH 3 COO) 2 、CoF 2 、CoCl 2 , Ni(NO 3 ) 2 、NiSO 4 , Ni(CH 3 COO) 2 、NiF 2 and NiCl 2 one or more of them. In the present invention, the trivalent metal water-soluble salt preferably includes Cr(NO 3 ) 3 、Cr ...

Embodiment 1

[0039] 0.12mol Mg(NO 3 ) 2 , 0.04mol Al(NO 3 ) 3 Mix with 100mL water to obtain a mixed metal ion solution;

[0040] Under stirring conditions, 100 mL of ammonia water with a concentration of 6 mol / L was added dropwise into the mixed metal ion solution, and the pH value was kept at 10, aged at room temperature for 24 hours, filtered, and the obtained solid product was washed with ultrapure water. Until the lotion is neutral, place it in a freeze dryer for freeze-drying, grind the obtained freeze-dried powder and pass through a 150-mesh sieve, the part under the sieve is LDHs, and the specific surface area is 49.2m 2 / g.

[0041] Take unpolluted soil with a relative humidity of 76% in Xuanwu District, Nanjing City, Jiangsu Province, and then dry it in the sun, grind it and pass it through a 2mm sieve, and take the part under the sieve to obtain the experimental soil.

[0042] Add PFBA, PFBS, PFOA, PFOS, F-53B and GenX to ultrapure water to prepare a low-concentration PFASs...

Embodiment 2

[0046] Add low-concentration polluted soil with a depth of 22 cm to a planting pot with a diameter of 20 cm and a height of 30 cm, and plant two reeds in each pot. The growth period of the reeds is 60 days, and the temperature is room temperature. Water 650mL every day, and water 650mL every 14 days from the 15th to 60th day. During the test, the surface water in the planting pots was collected regularly to measure the concentration changes of PFASs in the surface water, and the parallel experiments were performed 3 times.

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Abstract

The invention provides a restoration method for PFASs polluted wetlands, which belongs to the technical field of wetland pollutant restoration. The method for remediating PFASs-contaminated wetlands provided by the invention comprises the following steps: planting aquatic plants in PFASs-contaminated wetlands and / or adding LDHs to remediate PFASs pollutants. The aquatic plants adopted in the present invention have well-developed and fibrous root systems, and have strong enrichment capacity for PFASs. In the present invention, the LDHs have a large specific surface area and the joint effect of anions in the LDHs makes the LDHs have a good adsorption effect on the PFASs. Meanwhile, the enrichment of PFASs by reeds was increased after application of LDHs. The invention uses aquatic plants combined with LDHs to have an excellent restoration effect on PFASs pollutant wetlands; moreover, the restoration method provided by the invention is simple to operate, has excellent removal effects on various PFASs, and is suitable for large-scale restoration of PFASs pollutants wetlands.

Description

technical field [0001] The invention relates to the technical field of wetland pollutants, in particular to a method for restoring wetlands polluted by PFASs. Background technique [0002] Per- and polyfluoroalkyl substances (PFASs) are a new type of synthetic persistent organic pollutants, which have good thermal stability, chemical stability and surface activity, and are widely used in industry and human daily life. In daily necessities. PFASs have multiple toxicities to human reproduction, development, nerves, immunity, etc., and are a class of environmental pollutants with systemic multi-organ toxicity. Today, the increasing discharge of chemically resistant PFASs in the natural environment and the presence of these anthropogenic pollutants in natural and treated waters, human and animal organisms pose a great environmental challenge. [0003] At present, the removal technologies of PFASs mainly include adsorption and degradation technologies. Common PFASs degradation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/105B09C1/08Y02A40/22
Inventor 宋昕许昶穆艾伟唐志文
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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