Composite membrane for mabr and preparation method thereof

A technology for composite membranes and porous membranes, applied in the field of composite membranes and preparations for MABR, can solve problems such as easy pollution, expensive equipment, and difficulty in obtaining uniform reactions, and achieve low production costs, easy control, and simple preparation methods Effect

Active Publication Date: 2015-08-12
TIANJIN HYDROKING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of plasma surface modification technology are: it has good adhesion to substrate materials and can prepare films with special chemical properties; the disadvantages of plasma technology include that the equipment used is expensive, and it is difficult to obtain uniform reactions in narrow and long cavities. Pollution prone to occur before and after preparation

Method used

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  • Composite membrane for mabr and preparation method thereof
  • Composite membrane for mabr and preparation method thereof
  • Composite membrane for mabr and preparation method thereof

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preparation example Construction

[0030] The invention provides a composite membrane for MABR and a preparation method thereof. The surface of the porous membrane is evenly coated with levodopa, and a layer of levodopa composite membrane is formed on the surface of the membrane. The thickness of the levodopa composite membrane is 10 nanometers to 2 mm, to obtain higher membrane bubble point pressure, membrane oxygen permeability, surface hydrophilicity and surface roughness, etc.

[0031] The porous membrane used in the present invention includes polyethylene, polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, polystyrene, polyacetic cellulose, polyvinyl acetate cellulose, polyvinyl chloride, polysulfone, polyethersulfone, etc. Polymer materials and their modification, composite tubular membranes (including hollow fiber membranes, etc.) and flat membranes. Porous membranes that can be treated in the present invention include tubular membranes and flat sheet membranes.

[0032] In the present inv...

Embodiment 1

[0041] A composite membrane for MABR, the membrane provided by this embodiment is a composite membrane formed by applying a levodopa solution to the surface of a PVDF porous hollow fiber membrane;

[0042] The specific preparation method is as follows:

[0043] (1) Preparation of levodopa solution: prepare 500 milliliters of levodopa solution with a pH value of 10 and a concentration of 0.8 g / L;

[0044] (2) Coating: Coat it evenly and without defects on the surface of PVDF porous hollow fiber membrane;

[0045] (3) Heat treatment: heat treatment at 80°C for 10 hours.

[0046] After testing, the gas flux is changed from 0.26mL / (S*mm before unmodification 2 ) to 0.34mL / (S*mm 2 ), the water contact angle decreased from 86.5 degrees to 76.2 degrees.

Embodiment 2

[0048]A composite membrane for MABR. The membrane provided in this embodiment is a composite membrane formed by coating a levodopa solution on the surface of a polysulfone porous flat membrane.

[0049] The specific preparation method is as follows:

[0050] (1) Preparation of levodopa solution: prepare a levodopa solution with a pH value of 5.0 and a concentration of 0.1 g / L;

[0051] (2) Coating: apply it evenly and without defects on the surface of polysulfone membrane;

[0052] (3) Heat treatment: heat treatment at 30°C for 30 hours.

[0053] After testing, the gas flux is changed from 0.31mL / (S*mm before unmodification 2 ) to 0.54mL / (S*mm 2 ), the water contact angle decreased from the original 76.5 degrees to 66.2 degrees, and the root mean square roughness of the film surface increased from the original 88.030nm to 111.777nm. Scanning electron micrographs of the membrane surface before modification are shown in figure 1 , the scanning electron micrographs of the co...

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Abstract

The invention relates to a composite film for an MABR (Membrane Aeration Biofilm Reactor) and a preparation method. The composite film is formed by a porous film and a levodopa composite layer compound on the surface of the porous film. The preparation method comprises the following steps: (1) preparing levodopa solution, i.e. preparing levodopa into the levodopa solution with concentration of 0.05 to 3g / L; (2) coating, i.e. uniformly coating the levodopa solution on the outer surface of the film; and (3) carrying out heat treatment, i.e. carrying out heat treatment on the composite film. The MABR composite film prepared by the preparation method disclosed by the invention has the advantages that the prepared film has high oxygen transmission performance, good surface hydrophilicity and biocompatibility and high roughness of the film surface.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to a method for modifying the membrane surface by surface coating technology, in particular to a composite membrane for MABR and a preparation method thereof. Background technique [0002] Bubble-free aerated membrane bioreactor (MABR) system is a new type of sewage treatment technology developed in the past 20 to 30 years. The principle of MABR sewage treatment is to use the aeration membrane module to perform bubble-free aeration to the microbial film and water body growing on the surface of the polymer membrane. During this aeration process, oxygen and nutrients pass through the concentration difference from both sides of the membrane. The functions of driving and microbial adsorption are utilized by microorganisms. Microbes decompose the pollutants in the water body into simple inorganic metabolites while utilizing nutrients, thereby purifying the water body. [0003] The MABR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00C02F3/10
CPCY02W10/15Y02W10/10
Inventor 李保安侯飞飞邢明皓
Owner TIANJIN HYDROKING SCI & TECH
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