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Bioresour Technol

Title:		Feasibility of nitrification/denitrification in a sequencing batch biofilm reactor with liquid circulation applied to post-treatment
Author(s):		Andrade do Canto CS; Rodrigues JA; Ratusznei SM; Zaiat M; Foresti E;
Address:		"Escola de Engenharia Maua, Instituto Maua de Tecnologia, Praca Maua, 1, CEP 09580-900, Sao Caetano do Sul, SP, Brazil"
Journal Title:		Bioresour Technol
Year:		2008
Volume:		20070302
Issue:		3
Page Number:		644 - 654
DOI:		10.1016/j.biortech.2006.12.040
ISSN/ISBN:		0960-8524 (Print) 0960-8524 (Linking)
Abstract:		"An investigation was performed on the biological removal of ammonium nitrogen from synthetic wastewater by the simultaneous nitrification/denitrification (SND) process, using a sequencing batch biofilm reactor (SBBR). System behavior was analyzed as to the effects of sludge type used as inoculum (autotrophic/heterotrophic), wastewater feed strategy (batch/fed-batch) and aeration strategy (continuous/intermittent). The presence of an autotrophic aerobic sludge showed to be essential for nitrification startup, despite publications stating the existence of heterotrophic organisms capable of nitrifying organic and inorganic nitrogen compounds at low dissolved oxygen concentrations. As to feed strategy, batch operation (synthetic wastewater containing 100 mg COD/L and 50 mg N-NH(4)(+)/L) followed by fed-batch (synthetic wastewater with 100 mg COD/L) during a whole cycle seemed to be the most adequate, mainly during the denitrification phase. Regarding aeration strategy, an intermittent mode, with dissolved oxygen concentration of 2.0mg/L in the aeration phase, showed the best results. Under these optimal conditions, 97% of influent ammonium nitrogen (80% of total nitrogen) was removed at a rate of 86.5 mg N-NH(4)(+)/Ld. In the treated effluent only 0.2 mg N-NO(2)(-)/L,4.6 mg N-NO(3)(-)/L and 1.0 mg N-NH(4)(+)/L remained, demonstrating the potential viability of this process in post-treatment of wastewaters containing ammonium nitrogen"
Keywords:		Aerobiosis Ammonium Sulfate/metabolism Bicarbonates/analysis *Biofilms *Bioreactors Feasibility Studies Filtration Nitrates/analysis Nitrites/analysis Nitrogen/analysis/*isolation & purification Organic Chemicals/analysis Sewage Volatilization Water Purif;
Notes:		"MedlineAndrade do Canto, Catarina Simone Rodrigues, Jose Alberto Domingues Ratusznei, Suzana Maria Zaiat, Marcelo Foresti, Eugenio eng Research Support, Non-U.S. Gov't England 2007/03/06 Bioresour Technol. 2008 Feb; 99(3):644-54. doi: 10.1016/j.biortech.2006.12.040. Epub 2007 Mar 2"