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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50986 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Borghei, Mehdi; Musavi, Abbas
- Abstract:
- Clean water is a growing need for humanity all around the Earth. Due to the shortage of clean water resources in most parts of our planet, wastewater treatment and reuse has been of great value in past decades. Much research has been conducted to improve treatment systems. One of the most recent advancements in water and wastewater treatment field is application of membrane bioreactor systems. Despite many advantages of these systems, membrane fouling has been the main drawback since the creation and application of them. The main objective of this research is to investigate the probable fouling reduction and head loss in flat sheet UF membranes due to the application of an anaerobic biological treatment stage before filtration. A membrane bioreactor system with two isolated treatment lines was designed and developed in this research. Line 1 consisted of an aerobic biological treatment reactor followed by a membrane filtration tank, where line 2 had an additional anaerobic reactor after the aerobic stage right before filtration process. Laboratory part of this research was carried out in two phases. In the first phase, line 1 was utilized with different SRT configurations of 5, 10, 20 and 30 days to determine the best configuration in regards to membrane permeability and COD removal rate from a synthetic feed. In second phase, system with a 30-day solids retention time was applied to the second treatment line with an additional anaerobic stage. Membrane permeability and COD removal rates were also recorded for this phase. Comparing the results of two treatment lines, operated under same SRT and MLSS configurations with similar membranes, shows that applying an anaerobic stage reduces the membrane initial fouling rate in unsteady state and extends the time it takes for the membrane to reach its steady-state flux. It also increases the revival rate of membrane in each resting time. However, the steady-state flux and TMP of both membranes in both treatment lines are approximately equal, regardless of applying an additional anaerobic stage
- Keywords:
- Membrane Bioreactor ; Activated Sludge ; Membrane Fouling ; Waste Treatment ; Solid Retention Time
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