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Improvement of Corrosion Resistance of Concrete Sewer Pipes Against Microbial Corrosion

Mozafari, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45204 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah
  7. Abstract:
  8. Microbiologically Influenced Corrosion (MIC) of concrete sewer ptpes and wastewater collection systems has been reported in many places of the world. Recently, numerous copper compounds have been used for bacterial growth control in sewer pipes. In this thesis, bath parameterswere optimized in order to maximize copper osmosis to the porous concrete matrix.Concrete pipes were electrochemically coated inCopper Lactate bath in a constant current mode (1=0.6 A), while temperature was set to 25, 50, 75 and 95
    °Cand pH to 9,10 and 11. Specimens were then characterized by scanning electron

    microscopy, optical microscopy, XRD andAAS. Copper Osmosis was highest in pH=9 and T=95°C. It was found that copper osmosis is greatly dependent on temperature;reverselypH has a trifle effect on the process. While pH and current were 9 and 0/6 A, increasing temperature from 25 to 95 °C resulted in copper content increase from 0.3 to 2%wt.Role of current in process was investigated by coating three pipes in optimum pH and temperature, while current was set to 0.3, 0.6 and 0.9 A. Three of coated Specimens and one refresh pipe were chosen to be filled by 50 mL of Acidithiobacillus Thiooxidans two week old culture and 440 mL of nutrient medium. pH of solution and dissolution of copper were measured during next two weeks. Activity of bacteria in coated and new pipes was studied by measuring the temporal variation of cellular Adenosine Triphosphate (ATP) production. A TP decreased drastically in coated specimens due to decline in live bacterial cell, however an increase of ATP was observed in new pipe that reflects growth in bacterial density.
  9. Keywords:
  10. Concrete ; Microbiologically Influenced Corrosion (MIC) ; Copper ; Acidithiobacillus Thiooxidans ; Antibacterial Coating

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