Application of modified polyurethane sponge in repair of non-aqueous organic-phase liquid contaminated soil and repair method of non-aqueous organic-phase liquid contaminated soil

A polyurethane sponge and repair method technology, which is applied in the application field of modified polyurethane sponge in repairing non-aqueous organic phase liquid contaminated soil, can solve the problems of high operation and maintenance costs, VOCs escape, complex VOCs treatment equipment, etc., and achieve large-scale Large-scale production, significant adsorption effect, and convenient method

Inactive Publication Date: 2019-06-07
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the in-situ heat treatment technology has fewer limiting factors and can quickly and efficiently remove a large amount of NAPLs from the site, it has the disadvantages of VOCs escape risk, underground heating and ground-assisted VOCs treatment equipment are complicated, and operation and maintenance costs are high.

Method used

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  • Application of modified polyurethane sponge in repair of non-aqueous organic-phase liquid contaminated soil and repair method of non-aqueous organic-phase liquid contaminated soil
  • Application of modified polyurethane sponge in repair of non-aqueous organic-phase liquid contaminated soil and repair method of non-aqueous organic-phase liquid contaminated soil
  • Application of modified polyurethane sponge in repair of non-aqueous organic-phase liquid contaminated soil and repair method of non-aqueous organic-phase liquid contaminated soil

Examples

Experimental program
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Effect test

preparation example Construction

[0053] 1. Preparation of modified polyurethane sponge:

[0054] 1) Prepare 0.01mol / L Tris buffer solution with pH=8.5: Weigh 0.12114g of tris hydroxymethylaminomethane, put it into a clean 100mL beaker, add water to dissolve, and adjust the pH of the Tris buffer solution using concentrated ammonia and a pH meter. Adjust to 8.5;

[0055] 2) Pretreatment of polyurethane sponge: place 4-inch (3.5 cm in diameter) cylindrical commercial polyurethane sponge in a 1L beaker, ultrasonically clean it with distilled water and ethanol for 3 times, and then dry it for later use;

[0056] 3) Polymerization reaction: Submerge the pretreated polyurethane sponge in step 2) in 2g / L dopamine solution (0.01mol / L Tris buffer solution configuration), magnetically stir at room temperature for 24h, then take it out and wash it with distilled water, and store it at 60°C Dry to obtain the polymerization product (recorded as: PU-PDA sponge);

[0057] 4) Grafting reaction: immerse the PU-PDA sponge pre...

Embodiment 1

[0071] Simulation of NAPLs contaminated sites:

[0072] Wash the beaker, ordinary quartz sand and cylindrical barbed wire with deionized water, then place the beaker on a ventilated and well-closed platform, pour 200mL of water into the beaker, and put the quartz sand to the 1200mL scale of the beaker After most of the water has settled, add n-hexane dyed with Sudan Red (139.6354g in total), insert a cylindrical barbed wire into the middle of the quartz sand, and finally cap the beaker to simulate NAPLs contaminated sites such as image 3 .

[0073] The method of modified polyurethane sponge repairing non-aqueous organic phase liquid polluted soil:

[0074] Insert a cylindrical PU-PDA-ODA sponge (4 inches in diameter, 3.5 centimeters) prepared above into the wire mesh of the above-mentioned simulated NAPLs-contaminated site, then close the beaker, take it out after standing for 10min, and use tweezers in a closed platform Quickly transfer the sponge to a 200mL beaker, close...

Embodiment 2

[0079] Simulation of NAPLs contaminated sites:

[0080]Wash the cuboid glass cylinder, quartz sand and other materials with deionized water, and then place it on a ventilated and well-closed platform, add 300mL of water, then add quartz sand, let it stand for 1 hour, and then add Sudan red dyed hexamethasone 200mL of alkane (139.6644g in total), and then insert perforated polytetrafluoroethylene tubes (wrapped with barbed wire to simulate the operation well) into the quartz sand in the middle area of ​​the glass cylinder, and use a peristaltic pump to connect the polytetrafluoroethylene tubes to build a circulation pump Inject the leaching system (simulated injection well and extraction well), insert the small polytetrafluoroethylene tube connected to the peristaltic pump into the quartz sand at both ends of the glass cylinder, and insert the silicone tube of the peristaltic pump connected to the polytetrafluoroethylene tube of the simulated injection well. In a large beaker f...

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Abstract

The invention discloses an application of modified polyurethane sponge in repair of non-aqueous organic-phase liquid contaminated soil and a repair method of the non-aqueous organic-phase liquid contaminated soil. The modified polyurethane sponge can be repeatedly used, adsorbed substances can be recycled only through physical extrusion, and elasticity and adsorption capacity of the sponge can berecovered, so that an effect of reutilization is achieved. Meanwhile, the modified polyurethane sponge is a biodegradable material, and secondary pollution to the soil is avoided. The modified polyurethane sponge provided by the invention has super-strong hydrophobicity, can selectively adsorb a non-aqueous organic-phase and repel water phase, and has a notable adsorption effect on non-aqueous organic-phase liquid in the soil, and the preparation method is simple and is easy to implement. The preparation method of the modified polyurethane sponge is simple, and the raw materials are easy to obtain. The modified polyurethane sponge provided by the invention is matched with a surfactant for use, so that a better removal effect is achieved on the non-aqueous organic-phase liquid in the soil,the repairing time is shorter, and repairing efficiency is higher.

Description

technical field [0001] The invention relates to the field of soil repair, in particular to the application of a modified polyurethane sponge in repairing soil polluted by non-aqueous organic phase liquids and a repair method thereof. Background technique [0002] The production pollution of my country's petrochemical industry and the leakage of underground oil tanks in gas stations have led to a large number of organic pollution sites, wide distribution, heavy pollution, and great harm. There are already hundreds of thousands of polluted sites in urgent need of restoration. These polluted sites are mainly distributed in densely populated and environmentally sensitive areas around cities, and often contain a large amount of persistent and highly toxic (carcinogenic, teratogenic, mutagenic) organic pollution such as benzene series, polycyclic aromatic hydrocarbons, organochlorine pesticides, and chlorinated hydrocarbons. thing. The increasingly serious problem of polluted sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00C08J9/40C08L75/04
Inventor 邓达义王理陆晓
Owner SOUTH CHINA NORMAL UNIVERSITY
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