Ammonium Oxidation at
the Oxic/Anoxic Interface

By Arne Olav Sliekers
December 2003
Delft University Press
ISBN: 90-407-2459-8
144 pages, Illustrated, 6 " x 9 "
$57.50 Paper Original

This is a Ph.D. dissertation. The aim of this thesis was to study the interactions between autotrophic nitrogen converting bacteria at oxygen-limited conditions. Furthermore, applications and consequences of these interactions in wastewater treatment technology were investigated. First, the interactions between aerobic and anaerobic ammonia oxidizers were studied in one reactor CANON system (chapter 2). Then, in chapter 3, the interactions between anaerobic ammonia oxidizers, aerobic ammonia oxidizers and aerobic nitrite oxidizers are described. In chapter 4, it is shown that high N-removal rates can be achieved using interactions between aerobic and anaerobic ammonia oxidizers in a gas lift reactor. In chapters 5 and 6, the interactions between aerobic ammonia and nitrite oxidizers are addressed. Chapter 7 shows that interactions between aerobic and anaerobic ammonia oxidizers are also possible using urea as the energy source. Chapter 8, finally shows that planctomycete-like anaerobic ammonia oxidizers are also present in natural environments and that extensive interactions between anammox bacteria and other bacteria are also possible outside man-made environments. Contents include: General introduction, Completely autotrophic nitrogen removal over nitrite in one single reactor, The CANON system under ammonium limitation: interaction and competition between three groups of bacteria, CANON and Anammox in a gaslift reactor, Nitrifying bacteria at the oxic/anoxic interface, Nitrite oxidizing bacteria at limiting oxygen concentrations: inhibiting and modeling, Nitrification and Anammox with urea as the energy source, Anaerobic ammonium oxidation by Anammox bacteria in the Black Sea, Integration and Outlook.


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