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Optimization of Hybrid Anaerobic/Aerobic Bioreactor for Phosphate Removal

Kavousi, Rezvan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50616 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. Discharging treated or raw waste water in to surface water may cause lots of serious problems, including growth of algae, as a result of the presence of nutrients in waste water.algae decrease the concentration of dissolve oxygen in water.phosphorus removal from waste water is of absolute necessity. according to the standards set by the environmental organization, discharge the untreated waster water in to the surface water is not allowed. on the other hand, given manager facilities of deprived area,effort is channeled to reach the desired result through designing the simplest treatment systems. anaerobic-aerobic systems have remarkably been used for many years in the treatment of urban and industrial waste water. combining both aerobic and anaerobic designs in one reactor leads to increased efficiency and decrese in the design and operating costs. comparisons show that the use of bioreactor with fixed compartment in wastewater treatment are is advantageous, considering their lower cost and higher COD reduction(more than 83%). The bioreactor used in this study is an anaerobic-aerobic combination in which anaerobic and aerobic sections are separated from each other by a grid. the dimensions of the reactor are 10 x10x80 cm3. the purpose of this study is to investigate the changes in %removal of phosphorus and COD in two different hydraulic retention times. according to the structure of the anaerobic/aerobic combined reactors, altering the hydraulic retention times was only possible by changing the volume of the anaerobic and aerobic sections. hence, the tests were taken in two volume of the anaerobic and aerobic sections. in the first case, up to 30cm of the height of the reactor was dedicated to the anaerobic section and 50cm to the aerobic section. in the second case,up to 12.5cm of the height of the reactor was dedicated to the anaerobic section and 67.5cm to the aerobic section.in either case, the synthesized feed entered the system at 28.8 lit/day. the experiments were performed at four different initial CODs, three different phosphorus initial concentrations, and two hydrolic retention times. the result show that at low concentration of COD(COD=500) and phosphorus, the reactor performance is very favorable and results in high COD and phosphorus removal rate,90% and 80%, respectively. it must be mentioned that by increasing the COD concentration to the values of 1000 to 1400ppm, COD removal efficiency of the reactor is declined to 60%
  9. Keywords:
  10. Phosphorus Chemical Removal ; Anaerobic-Aerobic System ; Bioreactor ; Waste Treatment ; Chemical Oxygen Demand (COD) ; Hybrid Reactor ; Hydraulic Loading

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