Manufacturing method of small-aperture polyether sulfone planar film for membrane bioreactor

A membrane bioreactor and manufacturing method technology, applied in the field of polyethersulfone membranes, can solve the problems of easy pore blockage of flux, difficult pore blockage, sharp reduction, etc., and achieve the effects of strong anti-pollution ability, small pore size and high flow rate

Active Publication Date: 2010-03-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned shortcomings of large pore size and easy clogging of the pores, resulting in a sharp d

Method used

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  • Manufacturing method of small-aperture polyether sulfone planar film for membrane bioreactor
  • Manufacturing method of small-aperture polyether sulfone planar film for membrane bioreactor
  • Manufacturing method of small-aperture polyether sulfone planar film for membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example one

[0042] According to the following components and ingredients: polyethersulfone 13%, DMF (N, N dimethyl formamide) 56%, polyethylene glycol (4000) 16%, polyethylene glycol (20000) 10%, PVP ( Polyvinylpyrrolidone) 4%, surfactant 1.0%. The above-mentioned raw materials are mixed to prepare a casting solution, which is heated at 80°C and dissolved for one week. After filtering the resulting casting liquid, it was cast on a polyester non-woven fabric on a flat sheet casting machine (density 100g / m 2 , Thickness 0.15mm), adjust the film-making machine blade gap 0.35mm, film-forming speed 2.5m / min, film-making room air relative humidity 50%, coagulation bath temperature 17-18 ℃ conditions film forming. After the prepared membrane is washed with water, pore-preserving treatment and dried, a flat polyethersulfone filter membrane is obtained (see Figure one ). Figure one , two Electron micrographs of the membrane surface and cross-section. The photos show that the ...

Example Embodiment

[0043] Example two

[0044] According to the following components and ingredients: polyethersulfone 16%, NMP (N-methylpyrrolidone 54%, polyethylene glycol (1000) 13%, PEG (20000) 12.5%, PVP (polyvinylpyrrolidone) 4%, Surfactant 0.5%. The above raw materials are mixed to prepare a casting solution, which is heated at 80°C and dissolved for one week. N 2 Air pressure filtration. After defoaming the obtained casting liquid, it was cast on a polyester non-woven fabric (density 95g / m 2 , Thickness 0.2mm), adjust film making machine blade gap 0.30mm, film forming speed 2.5m / min, film making room relative humidity 55%, coagulation bath temperature 20-21 ℃ conditions continuous film making. After the prepared film is washed with water, pore-preserving treatment and dried, a finished film is obtained.

[0045] Figure three The surface electron microscope photo of the finished membrane of this example shows that the membrane surface has a small and uniform pore size, with a pore size of a...

Example Embodiment

[0046] Example three

[0047] The finished film of the above example 1 is made into 5 small flat film modules (size 8×22cm), and the effective film area is about 1400cm 2 , Immersed in activated sludge tank, liquid level height 80cm, activated sludge concentration 6000mg / L, aeration intensity 0.2m 3 / h, the inlet water COD=400~500mg / L, BOD=200~300mg / L, the water quality of the flat membrane module is as follows:

[0048]

[0049] The initial production water flux is 32L / m 2 h. After 27 days of operation, due to the deposition of surface contaminants, the water production flux decreased by about 15%. After the membrane surface was mechanically washed, the water production flux recovered as before, showing the excellent anti-pollution ability of the small pore membrane.

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Abstract

The invention relates to the technical field of polymer material films, and discloses a manufacturing method of small-aperture polyether sulfone planar films for a film bioreactor, which comprises the following steps: using polyether sulfone as a film forming material, using a high molecular polymer additive and an anionic surfactant for improving the viscosity and the water affinity of a castingfilm fluid, and using an amount of appropriate nonsolvent for rapid demixing and gelation, so as to prepare the polyether sulfone planar film with small aperture (0.04-0.15micron), high aperture ratio, thin skin and high flux. The prepared film is used for the film bioreactor, and film holes are not easily blocked and have high and stable flux.

Description

technical field [0001] The invention relates to a polyethersulfone membrane, in particular to a method for manufacturing a small-aperture polyethersulfone flat membrane applied to a membrane bioreactor. Background technique [0002] Membrane bioreactor, MBR (Membrane Bioreactor) replaces the traditional secondary settling tank with membrane modules. It is a new type of high-efficiency biological treatment technology that integrates biological treatment and membrane separation. It has many obvious advantages that cannot be compared with other biological treatment processes: (1) compact structure, small footprint; (2) high treatment efficiency, good effluent quality, which fundamentally solves the problem of sludge bulking; (3) volume load High, strong load impact resistance; (4) The amount of excess sludge produced is small, reducing the workload and cost of sludge treatment; (5) The MBR treatment system is equipped with equipment and has a high degree of automation. Therefo...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/06
Inventor 王勇华耀祖江和龙沈加正谭巧国
Owner NANJING UNIV
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