Total nitrogen removal in a hybrid, membrane-aerated activated sludge process

Water Research
Leon S Downing, Robert Nerenberg

Abstract

The hybrid (suspended and attached growth) membrane biofilm process (HMBP) is a novel method to achieve total nitrogen removal from wastewater. Air-filled hollow-fiber membranes are incorporated into an activated sludge tank, and a nitrifying biofilm develops on the membranes, producing nitrite and nitrate. By suppressing bulk aeration, the bulk liquid becomes anoxic, and the nitrate/nitrite can be reduced with influent BOD. The key feature that distinguishes the HMBP from other membrane-aerated processes is that it is hybrid; heterotrophic bacteria are kept mainly in suspension by maintaining low bulk liquid BOD concentrations. We investigated the HMBP's performance under a variety of BOD and ammonium loadings, and determined the dominant mechanisms of nitrogen removal. Suspended solids increased with the BOD loadings, maintaining low bulk liquid BOD concentrations. As a result, nitrification rates were insensitive to the BOD loadings, remaining at 1gNm(-2)day(-1) for BOD loadings ranging from 4 to 17gBODm(-2)day(-1). Nitrification rates decreased during short-term spikes in bulk liquid BOD concentrations. Shortcut nitrogen removal was confirmed using microsensor measurements, showing that nitrite was the dominant form of oxid...Continue Reading

Citations

Sep 25, 2008·Applied Microbiology and Biotechnology·Leon S Downing, Robert Nerenberg
Jan 26, 2010·Applied Microbiology and Biotechnology·Caitlyn S Butler, Robert Nerenberg
Sep 4, 2008·Biotechnology and Bioengineering·Leon S Downing, Robert Nerenberg
Feb 3, 2012·Environmental Science & Technology·Joshua D Shrout, Robert Nerenberg
Feb 15, 2012·Environmental Technology·Jiazhong QianPaul H Fallgren
Jul 28, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·Hyun-Su KimRobert Dodson
Apr 8, 2010·Water Environment Research : a Research Publication of the Water Environment Federation·Leon S DowningRobert Nerenberg
Aug 22, 2018·Applied Microbiology and Biotechnology·A Ontiveros-ValenciaB E Rittmann
Dec 10, 2020·Environmental Microbiology·Jeseth Delgado VelaGregory J Dick
Mar 23, 2021·The Science of the Total Environment·Nerea Uri-CarreñoXavier Flores-Alsina
Mar 27, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Avery L CarlsonGlen T Daigger
Sep 8, 2010·Environmental Science & Technology·Carles Pellicer-NàcherBarth F Smets
Sep 13, 2019·Environmental Science & Technology·Dianxun HouZhiyong Jason Ren
Oct 17, 2017··Nor Hana AdamMohd Suffian Yusoff

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