Effect of low dissolved oxygen on simultaneous nitrification and denitrification in a membrane bioreactor treating black water

2011 ◽  
Vol 102 (6) ◽  
pp. 4333-4340 ◽  
Author(s):  
S. Murat Hocaoglu ◽  
G. Insel ◽  
E. Ubay Cokgor ◽  
D. Orhon
Keyword(s):  
Dissolved Oxygen ◽  
Membrane Bioreactor ◽  
Simultaneous Nitrification And Denitrification ◽  
Low Dissolved Oxygen ◽  
Black Water ◽  
Nitrification And Denitrification

Effect of sludge age on simultaneous nitrification and denitrification in membrane bioreactor

2011 ◽  
Vol 102 (12) ◽  
pp. 6665-6672 ◽  
Author(s):  
S. Murat Hocaoglu ◽  
G. Insel ◽  
E. Ubay Cokgor ◽  
D. Orhon
Keyword(s):  
Membrane Bioreactor ◽  
Simultaneous Nitrification And Denitrification ◽  
Nitrification And Denitrification

Achieving simultaneous nitrification and denitrification of wastewaters at reduced cost

1995 ◽  
Vol 32 (9-10) ◽  
pp. 303-312 ◽  
Author(s):  
Mike O'Neill ◽  
Nigel J. Horan
Keyword(s):  
Dissolved Oxygen ◽  
Electron Acceptor ◽  
Nitrogen Removal ◽  
Lag Time ◽  
Simultaneous Nitrification And Denitrification ◽  
Waste Waters ◽  
Mediterranean Environment ◽  
Dissolved Oxygen Concentration ◽  
Terminal Electron Acceptor ◽  
Nitrification And Denitrification

The Orbal process for the treatment of waste waters, claims simultaneous nitrification and denitrification in the outer lane in the presence of a dissolved oxygen concentration of 1.5 mg/l. The potential of this process is to offer both a reduced cost and simplified operation for nitrogen removal in the Mediterranean environment. The objective of this work was to investigate these claims and attempt to describe a mechanism for the experimental verifications. Using mixed cultures grown in chemostats, simultaneous nitrification and denitrification was observed under oxic/anoxic cycling. A reduced pathway, or ‘nitrite shunt’ could not be demonstrated but it was possible to explain the observations based on the lag time of the denitrifiers under oxic conditions. Denitrification continued for some time before oxygen replaced nitrate as the terminal electron acceptor and the length of the lagged response was a function of the duration of the anoxic conditions.

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