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The combined UASB and MBR system to COD and TSS removal and excess sludge reduction for the treatment of high strength wastewater in various operational temperatures
, Article Desalination and Water Treatment ; Volume 53, Issue 2 , 2015 , Pages 352-359 ; 19443994 (ISSN) ; Shayegan, J ; Mirbagheri, S. A ; Farajzadehha, S ; Hazrati, H ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
There are many activated sludge plants (ASP) in Iran. Most of them are overloaded and as a result their efficiency is very low. A combined laboratory-scale system (5 L reactors) consisting of an up-flow anaerobic sludge blanket (UASB) and aerobic membrane bioreactor (MBR) was operated at 20 and 30°C with pH between 7.6 and 8.4. The experiment was run to optimize treatment of high-strength enriched municipal wastewater of the Ekbatan treatment plant located in west Tehran. The chemical oxygen demand (COD) of the wastewater was enriched due to the addition of molasses and milk powder. To prevent pH fluctuation of the influent, NaHCO3 and K2HPO4 were added to the wastewater. The excess sludge...
Upgrading activated sludge systems and reduction in excess sludge
, Article Bioresource Technology ; Volume 102, Issue 22 , November , 2011 , Pages 10327-10333 ; 09608524 (ISSN) ; Shayegan, J ; Sharif University of Technology
2011
Abstract
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...