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Investigation and Modeling of Fouling and its Affecting Operational Parameters in Membrane Bioreactors (MBR) for Municipal Wastewater Treatment

Pourabdollah, Mahdi | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50245 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Torkian, Ayoub
  7. Abstract:
  8. This study aims to investigate the influence of important operational parameters on membrane fouling with the approach of fouling layers and to model these influences in the membrane bioreactor (MBR) for municipal wastewater treatment. At the first phase, 11 operational scenarios were executed using a pilot setup for identifying the system behavior and the optimal scenario. Protein and carbohydrate as the fouling components (SMP) and the transmembrane pressure (TMP) as the fouling criteria were measured in the tests. By studying the influence of operational parameters (sludge retention time (SRT), aeration rate and filtration mode), some useful results obtained for the next phase, including effectiveness of relaxation mode instead of backwashing and determination of efficient variation ranges of the parameters. Second phase of the study was implemented for modeling the influence of operational parameters on membrane fouling. 25 replicated scenarios were designed based on the Design of Experiments method, using DX8 program. A main model of fouling rate and some other models of fouling components concentrations (at the reactor, the effluent and the fouling layers) as the functions of operational parameters were developed and validated. The models analyses showed that: the most effective operational parameters are SRT, aeration rate, relaxation interval and duration, respectively. By increasing SRT from 10 to 30 days, fouling rate decreases, but increasing aeration rate has a dual effect on fouling. Protein showed a more effective role on fouling than carbohydrate and the intermediate layer was more effective on membrane fouling than the upper layer. The optimal point for MBR operation was: SRT = 30 days, aeration = 10.7 L/min, relaxation interval = 8.8 minutes, and relaxation duration = 42 seconds
  9. Keywords:
  10. Carbohydrates ; Proteins ; Response Surface Methodology ; Soluble Microbial Product (SMP) ; Membrane Bioreactor ; Fouling ; Soluble Microbial Product (SMP) ; Municipal Wastewater Treatment

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