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Upgrading activated sludge systems and reduction in excess sludge

Hazrati, H ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.biortech.2011.08.112
  3. Publisher: 2011
  4. Abstract:
  5. Most of 200 Activated Sludge Plant in Iran are overloaded and as a result, their efficiency is low. In this work, a pilot plant is manufactured and put into operation in one of the wastewater treatment plants in the west of Tehran. Instead of conventional activated sludge, a membrane bioreactor and an upflow anaerobic sludge blanket reactor used as a pretreatment unit in this pilot. For the sake of data accuracy and precision, an enriched municipal wastewater was opted as an influent to the pilot. Based on the attained result, the optimum retention time in this system was 4. h, and the overall COD removal efficiency was 98%. As a whole, the application of this retrofit would increase the plant's capacity by a factor of 5 and reducing the excess sludge by a factor of 10. The sludge volume index in the anaerobic reactor was about 12 after granulation occurred
  6. Keywords:
  7. Enriched municipal wastewater ; Membrane bioreactor ; Sludge reduction ; Upflow anaerobic sludge blanket reactor ; Activated sludge plants ; Activated sludge systems ; Anaerobic reactor ; COD removal efficiency ; Conventional activated sludges ; Data accuracy ; Excess sludge ; Municipal wastewaters ; Plant's capacity ; Pretreatment units ; Retention time ; Sludge volume index ; Wastewater treatment plants ; Bioreactors ; Pilot plants ; Retrofitting ; Wastewater ; Wastewater treatment ; Water treatment plants ; Activated sludge process ; Data set ; Manufacturing ; Membrane ; pollutant removal ; Reduction ; Waste treatment ; Activated sludge ; Chemical oxygen demand ; Membrane reactor ; Nonhuman ; Plant ; Priority journal ; Sludge ; Upflow reactor ; Waste water management ; Bacteria ; Biodegradation, Environmental ; Biological Oxygen Demand Analysis ; Membranes, Artificial ; Methane ; Nitrates ; Oxygen ; Pressure ; Sewage ; Sulfates ; Time Factors ; Waste Disposal, Fluid ; Water Purification ; Iran
  8. Source: Bioresource Technology ; Volume 102, Issue 22 , November , 2011 , Pages 10327-10333 ; 09608524 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0960852411012223