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Simultaneous carbon and nitrogen removal in a mixed culture aerobic RBC biofilm

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Title Simultaneous carbon and nitrogen removal in a mixed culture aerobic RBC biofilm
 
Creator GUPTA, AB
GUPTA, SK
 
Subject rotating biological contactors
thiosphaera-pantotropha
nitrification-denitrification
organic-matter
oxygen
reductases
aeration
systems
enzyme
growth
thiosphaera pantotropha
mixed culture biofilm
carbon removal
nitrogen removal
autotrophic
nitrification
heterotrophic nitrification
aerobic denitrification
 
Description A mixed culture biofilm was developed with a sulfur oxidising, heterotrophic bacterium Thiosphaera pantotropha autotrophic nitrifiers and other heterotrophs in a three stage rotating biological contactor (RBC). Specific benefits due to peculiar properties of T. pantotropha of simultaneous heterotrophic nitrification and aerobic denitrification were derived in the reactor investigated for a combined carbon and nitrogen removal from a synthetic domestic sewage. The first stage biofilm which contained T. pantotropha showed high COD and NH4+-N removal rates of 5.8-14.1 g COD/m(3).d and 0.47-1.1 g N/m(2).d for the corresponding loading rates of 6.9-20.7 g COD/m(3).d and 0.69-2.09 g N/m(2).d, respectively. Contrary to the conventional units designed for a concurrent carbon removal and nitrification, the nitrification rates increased linearly with an increase in organic loading rate before stabilising at about 1 g N/m(2).d corresponding to a COD loading rate of about 15 g/m(2).d and a nitrogen loading rate of 1.5 g N/m(2).d showing a change in the order of reaction from first to zero. A simultaneous nitrogen removal of 20-68% was also obtained. The system's performance indicated that a single stage aerobic biofilm can be developed to meet the increasingly stringent regulations on effluent nitrogen discharges affording several advantages over the conventional systems, e.g. low buffer requirements, no need for external carbon source for denitrification, etc., which may result in substantial reduction in the treatment cost. (C) 1998 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-26T12:50:54Z
2011-12-26T12:57:27Z
2011-12-27T05:41:16Z
2011-08-26T12:50:54Z
2011-12-26T12:57:27Z
2011-12-27T05:41:16Z
1999
 
Type Article
 
Identifier WATER RESEARCH, 33(2), 555-561
0043-1354
http://dx.doi.org/10.1016/S0043-1354(98)00206-1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11314
http://hdl.handle.net/10054/11314
 
Language en