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Title: Submerged membrane bioreactor system for municipal wastewater treatment process: An overview
Authors: Gupta, Neha
Jana, N
Majumder, C B
Keywords: Submerged membrane
Wastewater treatment
Hydrarulic retention time
Issue Date: Nov-2008
Publisher: CSIR
Abstract: The submerged membrane bioreactor (SMBR) is a promising technology for wastewater treatment and water reclamation. This paper provides an overview of wastewater treatment in a submerged membrane bioreactor process with a special focus on municipal wastewater systems. SMBRs predict more than 95% organic removal with relative short hydraulic retention times (HRTs) of 1-8 h and NH3 removal of more than 90% in the municipal wastewater treatment. It achieves 30% more removal of organic matter than activated sludge process. The COD can be reduced by 95%. Nitrification was complete and up to 82% of the total nitrogen could be denitrified. Nitrification/ denitrification is sensitive to the feed quality, such as dissolved oxygen (DO) concentration, temperature, organic loads, inorganic/ organic compounds and pH. The feed water composition, membrane geometry/configuration, membrane materials, and hydrodynamic effects are responsible for membrane fouling. These drawbacks can be reduced by maintaining turbulent conditions, operating at critical flux, and by selection of a suitable fouling resistance membrane material. Membrane washing is performed when the permeability is less than 10% of initial permeability. The reactor performance and the stability of the process and the membrane capacity are also discussed. Details of the various methods for washing are also included.
Page(s): 604-612
ISSN: 0971–457X
Source:IJCT Vol.15(6) [November 2008]

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