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Investigation on MBBR with Suspended Biomass and Recycled Sludge

Maleki Shahraki, Zahra | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47536 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borgheei, Mahdi
  7. Abstract:
  8. There is a growing demand for efficient treatment plans which can deal with high loading of organic pollutant, considering the population growth in communities. Our country is going toward industrialization; hence, it requires more effective and efficient treatment plans as well as innovative ones. Moving Bed Biological Reactors are accounted amongst appropriate methods in removing various pollutant which has been used in recent decades. In regard to increasing demand for new treatment plans, one of the options can be upgrading of existing activated sludge systems. Two bioreactors with 10 liter volume each in parallel lines were used in this work. One of them was a regular MBBR as a blank reactor and the other one had recycled flow as a hybrid bioreactor with both suspended biomass and biofilm on moving media. Reactors had volume filling ratio of 40%. The seeds for sludge provided from Ekbatan Wastewater Treatment plan. Synthetic inflow consisted of molasses, urea and ammonium phosphate with average concentration of 1019,50 and 10 mg/L respectively. Hydraulic retention time for both reactors was 6 hours. Experiments performed in five stages with different proportion of Qr to Qin including 1, 0.75, 0.49, 0.3 and 0.14. In every stage COD and TP removal were examined in specific intervals for four times. The purpose is investigating the effect of different amount of recycled flow on MLSS, searching for the relation between MLSS concentration and nutrient removal (COD and TP ) in comparison to blank reactor, and seeking for an appropriate kinetic model for hybrid reactor in order to help in designing such reactors. COD removal efficiency in hybrid reactor was between 87.56 to the maximum of 96.64 percent, and TP removal efficiency was between 60.79 to 79.82%. MLSS changed between 340 to 1960 mg/L with the change in Qr/Qin. Calculated kinetic coefficient of K and Ks are 2:16d-1 and 127.41 mg/L for COD, and 0:02d-1 and 4.70 mg/L for TP
  9. Keywords:
  10. Biofilm ; Kinetic Model ; Moving Bed Biofilm Reactor (MBBR) ; Back Mixing ; Suspended Biomass

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