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Microbial carrier hybrid MBfR membrane and preparation method thereof

A microbial carrier and hybridization technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as product failure, hollow fiber membranes are easy to break, cortex shedding, etc., and achieve simple operation, simple preparation method, anti The effect of enhancing the ability of water force and soda shock

Active Publication Date: 2019-04-09
BEIJING YONGJUHE ENVIRONMENTAL PROTECTION INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the long-term use environment of water power and soda shock, the unsupported PVDF hollow fiber membrane has the defect of easy broken filaments. In order to solve this problem, the MBR membrane elements on the market currently use PET crochet tubes to coat PVDF to manufacture filter membranes, but this The inner filter membrane can only be used as an external pressure, the use of internal pressure will cause the skin to fall off, and the product will fail

Method used

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  • Microbial carrier hybrid MBfR membrane and preparation method thereof
  • Microbial carrier hybrid MBfR membrane and preparation method thereof
  • Microbial carrier hybrid MBfR membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Each component of embodiment 1 prepares the casting solution of MBfR membrane by following weight ratio: weight-average molecular weight is 15% of PVDF resin powder of 700,000, polyvinylpyrrolidone (PVP-K15) powder 12%, polyethylene glycol (PEG- 600) liquid 3%, 200 mesh particle diameter nitric acid modified activated carbon material 2%, commercially available carbon nanotube 3%, dimethylacetamide (DMAc) solvent 65%, with above material by certain order (at first PVP -Add K15 and PEG-600 into DMAC solution, stir for 20 minutes, then add activated carbon and carbon nanotubes, stir for 30 minutes to 2 hours, and finally add PVDF. Activated carbon and carbon nanotubes can also be added first, but not last, Otherwise it will lead to uneven mixing, and uneven mixing will make the final product defective.) Add it to the reactor, keep the jacket temperature of the reactor at 60°C, stir for 12 hours at a stirring speed of 150rpm, and let the material liquid stand for 12 hours F...

Embodiment 2

[0049] Embodiment 2 Each component prepares the casting film solution of MBfR membrane by following weight ratio: weight average molecular weight is 18% of PVDF resin powder of 700,000, polyvinylpyrrolidone (PVP-K15) powder 8%, 600 mesh particle diameter nitric acid modification Activated carbon material 0.5%, commercial carbon nanotube 4.5%, dimethylacetamide (DMAc) solvent 69%. The spinning process is the same as in Example 1, spinning at a speed of 15m / min, and the finished product properties measured are as follows: the fiber tensile elongation at break is 165%, the fiber tensile strength at break is 3.6N, and the outer aperture of the hollow fiber membrane is 0.1 Micron, inner diameter 22 microns.

Embodiment 3

[0051] Embodiment 3 Each component prepares the casting liquid of MBfR membrane by following weight ratio: weight average molecular weight is 25% of PVDF resin powder of 700,000, polyethylene glycol (PEG-600) liquid 15%, commercially available carbon nanotube 5% %, dimethylformamide (DMF) solvent 55%. The spinning process is the same as in Example 1, spinning at a speed of 45m / min, and the finished product properties measured are as follows: the fiber tensile elongation at break is 176%, the fiber tensile strength at break is 4.2N, and the outer diameter of the hollow fiber membrane is 0.05 Micron, the inner hole diameter is 15 microns.

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Abstract

The invention relates to a microbial carrier hybrid MBfR membrane and a preparation method thereof. The MBfR membrane comprises a casting membrane solution containing the components in percentage by weight: 12-35% of PVDF, 2-18% of pore forming agent, 0.05-15% of microbial carrier and 45-86% of solvent; the microbial carrier is mainly one of nitric acid modified activated carbon powder with the particle size of 300-2000 meshes and carbon nanotubes or a combination of the nitric acid modified activated carbon powder and the carbon nanotubes. The microbial carrier hybrid MBfR membrane is a hollow fiber membrane, inner and outer side apertures are in gradient distribution, and the ratio of the inner and outer side apertures is 5-50; and the hollow fiber membrane is an inner and outer circle concentric single-core membrane or is of a multi-core porous structure. Activated carbon microparticles doped into the surface of the membrane provide greatly specific surface area and good microbial attachment and growth conditions for products; and the multi-core porous membrane structure has relatively high mechanical strength, so that the water resistance as well as steam and water impact capacity of the products are greatly improved.

Description

technical field [0001] The application belongs to the technical field of ultrafiltration membrane preparation, and specifically relates to a multi-core structure-enhanced microbial carrier hybrid MBfR membrane with PVDF as the main body and a preparation method thereof. Background technique [0002] Membrane Biofilm Reactor (MBfR) membrane is a new water pollution control technology that combines membrane aeration with traditional biological sewage treatment. Due to its excellent oxygen mass transfer characteristics, it can be applied to the treatment of excessive nitrite Compared with the reverse osmosis treatment process and nanofiltration treatment process, the treatment of drinking water projects can save energy by 40-90%, and there is no concentrated water discharge; it can also be applied to the treatment of black and odorous rivers and other nitrification and denitrification links. Purification, water reuse, wastewater treatment and other fields have been more and mor...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D69/02B01D71/34B01D67/00
CPCB01D67/0079B01D69/02B01D69/08B01D71/34B01D2325/24
Inventor 李涓胜
Owner BEIJING YONGJUHE ENVIRONMENTAL PROTECTION INVESTMENT
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