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Bionic nanofiltration membrane for extracting humic acid from landfill leachate membrane concentrate and preparation method of bionic nanofiltration membrane

A technology for landfill leachate and membrane concentration, applied in the field of nanofiltration membranes, can solve the problems of bionic layer roughness, long reaction time, deposition difficulties, etc., and achieve the effects of excellent anti-pollution performance, simple deposition method and excellent performance.

Inactive Publication Date: 2020-04-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is extremely difficult to deposit and form a complete and dense biomimetic layer on the surface of the base film only under slightly alkaline conditions.
This process requires a very long reaction time, and the resulting biomimetic layer is likely to be very rough and unstable

Method used

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  • Bionic nanofiltration membrane for extracting humic acid from landfill leachate membrane concentrate and preparation method of bionic nanofiltration membrane
  • Bionic nanofiltration membrane for extracting humic acid from landfill leachate membrane concentrate and preparation method of bionic nanofiltration membrane
  • Bionic nanofiltration membrane for extracting humic acid from landfill leachate membrane concentrate and preparation method of bionic nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A biomimetic nanofiltration membrane for extracting humic acid in landfill leachate membrane concentrate, its preparation method comprises the following steps:

[0024] 1) Dissolving polyethyleneimine and persulfate in Tris hydrochloride buffer solution, and adjusting the pH to 8.5; then adding dopamine hydrochloride, and mixing thoroughly to obtain a membrane modification solution; the membrane The concentration of dopamine hydrochloride in the modified solution is 1.06×10 -2 mol / L, the concentration of polyethyleneimine is 6.7×10 -3 mol / L, the concentration of persulfate is 8.7×10 -3 mol / L.

[0025] 2) Fix the basement membrane with a molecular weight cut-off of 640 Da in the device for interfacial reaction; pour the membrane modification solution to make it fully contact with the surface of the basement membrane and carry out the deposition reaction; after 2 h, the modified basement membrane The membrane is taken out and cleaned to obtain a biomimetic nanofiltra...

Embodiment 2

[0028] A biomimetic nanofiltration membrane for extracting humic acid in landfill leachate membrane concentrate, its preparation method comprises the following steps:

[0029] 1) Dissolving polyethyleneimine and periodate in tris hydrochloride buffer solution, and adjusting the pH to 8.5; adding dopamine hydrochloride, and mixing thoroughly to obtain a membrane modification solution; The concentration of dopamine hydrochloride in the membrane modification solution is 1.06×10 -2 mol / L, the concentration of polyethyleneimine is 5.3×10 -3 mol / L, the concentration of periodate is 7.1×10 -3 mol / L.

[0030] 2) Fix the basement membrane with a molecular weight cut-off of 890 Da in the device for interfacial reaction; pour the membrane modification solution to make it fully contact with the surface of the basement membrane and carry out the deposition reaction; after 10 h, the modified basement membrane The membrane is taken out and cleaned to obtain a biomimetic nanofiltration m...

Embodiment 3

[0033] A biomimetic nanofiltration membrane for extracting humic acid in landfill leachate membrane concentrate, its preparation method comprises the following steps:

[0034] 1) Dissolving polyethyleneimine and Fenton's reagent in Tris hydrochloride buffer solution, and adjusting the pH to 8.5; then adding dopamine hydrochloride, and mixing thoroughly to obtain a membrane modification solution; the membrane The concentration of dopamine hydrochloride in the modified solution is 1.06×10 -2 mol / L, the concentration of polyethyleneimine is 7.9×10 -3 mol / L, the concentration of Fenton's reagent is 1.06×10 -2 mol / L.

[0035] 2) Fix the basement membrane with a molecular weight cut-off of 1280 Da in the device for interfacial reaction; pour the membrane modification solution to make it fully contact with the surface of the basement membrane and carry out the deposition reaction; after 16 h, place the modified basement membrane The membrane is taken out and cleaned to obtain a ...

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Abstract

The invention discloses a bionic nanofiltration membrane for extracting humic acid from landfill leachate membrane concentrate and a preparation method of the bionic nanofiltration membrane. The preparation method of the bionic nanofiltration membrane comprises the following steps: firstly, dissolving polyethyleneimine, an oxidizing agent and dopamine hydrochloride in a trihydroxymethyl aminomethane hydrochloride buffer solution, and fully mixing to prepare a membrane modification solution; then, fixing base membranes with different molecular weight cutoff into an interface reaction device, pouring the membrane modification liquid, and enabling the membrane modification liquid to be in full contact with the surfaces of the base membranes for deposition reaction; finally, after reaction fora period of time, enabling a polydopamine bionic layer to grow on the surfaces of the base membranes, taking out the modified base membranes and cleaning, and thus obtaining the bionic nanofiltrationmembrane. According to the bionic nanofiltration membrane, the rejection rate of humic acid can be greatly increased, so that enrichment, concentration and extraction of humic acid in the landfill leachate membrane concentrate are realized; in addition, the bionic nanofiltration membrane is endowed with excellent anti-pollution performance due to high hydrophilicity of the polydopamine bionic layer.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a bionic nanofiltration membrane for extracting humic acid in landfill leachate membrane concentrate and a preparation method thereof. Background technique [0002] At present, membrane bioreactor and nanofiltration / reverse osmosis coupling process have become common technologies for treating landfill leachate. However, the concentrate produced by this double-membrane coupling process is becoming a thorny environmental problem, and the volume of membrane concentrate usually accounts for about 25% of the total landfill leachate. [0003] The membrane concentrate of landfill leachate is rich in humic acid and high salinity, its biodegradability is extremely unsatisfactory, and it cannot be further treated by biodegradation. With people's in-depth understanding of the concept of environmental sustainability, these landfill leachate membrane concentrates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02C02F1/44C08H7/00
CPCB01D67/0006B01D69/02C02F1/442C08H6/00B01D2323/02B01D2325/36C02F2103/06
Inventor 林久养
Owner FUZHOU UNIV
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