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Improve the Structure of Membrane Bioreactor to Reduce Fouling for Industrial Waste Water Purification

Razzaghi, Mohammad Hossein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44893 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Seifkordi, Ali Akbar; Hemati, Mahmood
  7. Abstract:
  8. In the presence project by using of hydrophilic polymer, Cellulose acetate (CA), we tried to modify the membrane made of Polyvinylidine fluoride (PVDF). The membranes were made by phase inversion method. In five levels, at least 10% and at most 30%, CA was added to casting solution. The hydrophilicity of membranes’ surface and pore size was increased. The permeation of the neat membrane of PVDF was less than 10 , on the other hand the permeation of the membranes, which were made by adding CA, was increased up to 500 . The increment of CA more than 20% reduced the porosity of membrane. In the next step to reduce the irreversibility fouling tried to reduce the pore size by adding some additives to coagulant bath and nanoparticles to casting solution. In the first method, we used ethanol, 2-propanol, NaCl and NaOH as additives to coagulant bath. In result, the permeation and the fouling of the membrane, which made in coagulant bath with NaOH, was the least. In the second method, the membrane with 2% Titanium Oxide nanoparticle had the most permeation and the least total fouling. In the last step of experiments, the best membranes were used for fouling evaluation at three MLSS levels. Fouling evaluation was done under constant Transmembrane Pressure (TMP). In result, the membrane with 2% Titanium Oxide nanoparticle had more fouling resistant than the another membrane At the end the critical flux of membrane under maximum MLSS was calculated to define the operating condition of long term tests. For critical flux determination, two methods were used
  9. Keywords:
  10. Membranes ; PLUGGING ; Phase Inversion ; Membrane Bioreactor ; Critical Flux ; Industrial Wastewaters ; Waste Treatment

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