Performance of Activated Sludge System at Different Weather and Solution for Upgrading<br/>

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Performance of Activated Sludge System at Different Weather and Solution for Upgrading

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41604 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Shaygan Salek, Jalaloddin
Abstract:
Over 90 percent of the wastewater treatment systems use activated sludge which, yields to increase in organic loadings, these systems do not have appropriate performance. For upgrading of these systems a UASB reactor has been used prior to the activated sludge system, to improve the system performance and also reduce the excess sludge production. A membrane was also used instead of the sedimentation tank, to betterment the effluent quality. COD influent concentration was about 600 to 2400 mg/l, up to 98 percent of COD reduction obtain in this system. Also excess sludge reduction was over 90%. Such a system upgrading will increase treatment capacity by factor of 5. As it was shown, for UASBR, the optimum HRT is 4 hours and the optimum OLR is 7.2 to 10.8 kg COD/m3.d. At this condition, the reduction efficiency for COD, TSS, nitrate and SO4 were about 85, 75, 80 and 80% respectively. The SVI in the UASB reactor was about 12 after granulation occurred
Keywords:
Membrane Bioreactor ; Up-Flow Anaerobic Sludge Blanket (UASB)Reactor ; Enriched Municipal Wastwater ; Sludge Reduction

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