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Revival of ion selective appl covers.indd - Endress+Hauser

Revival of ion selective appl covers.indd - Endress+Hauser

NH 4 -N----------- At

NH 4 -N----------- At the same time the ISE sensor was measuring both ammonium and nitrate. The concentration of ammonium was very high during the initial period and with the increase in aeration nitrification takes place. As this measurement was taken in the first part of the carrousel, one could say that too much nitrification takes place with the corresponding high power cost. Distributed with permission of author(s) by ISA 2009 Presented at ISA 4 th WWAC Symposium 2009; http://www.isa.org

NO 3 -N------------ When looking at the concentration of nitrate it is clear that no denitrification is taking place confirming that there is too much oxygen at all times. This clearly demonstrates that the measurement of ammonium and nitrate are the most efficient way to optimize a plant to meet the discharge permit at the lowest cost. The control strategy is shown below Speed Set DO NH 4 DO Distributed with permission of author(s) by ISA 2009 Presented at ISA 4 th WWAC Symposium 2009; http://www.isa.org

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