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On-Line Monitoring of Nitrate and Nitrite by UV Spectrophotometry in a SBR Process Used for the Treatment of Industrial Wastewaters
1Laboratoire de Biotechnologie de l’Environnement, firstname.lastname@example.org
2Université de Technologie de Compiègne, email@example.com
3Laboratoire de Biotechnologie de l’Environnement, firstname.lastname@example.org
4Université de Technologie de Compiègne, email@example.com
5Laboratoire de Biotechnologie de l’Environnement, firstname.lastname@example.org
6Institut Lasalle Beauvais, email@example.com
7Université de Technologie de Compiègne, firstname.lastname@example.org
8Université de Technologie de Compiègne, email@example.com
Citation Information: International Journal of Chemical Reactor Engineering. Volume 6, Issue 1, Pages –, ISSN (Online) 1542-6580, DOI: 10.2202/1542-6580.1606, December 2008
- Published Online:
The objective is the adaptation of an existing UV spectrophotometer for the on-line monitoring of nitrate, nitrite and soluble COD during cycles of SBRs. An on-line filtering system was also developed in order to provide particle-free fluids to the sensor. The modified UV-spectrophotometer sensor (called "STAC") was implemented into a pilot-scale bioreactor at INRA-Narbonne, treating a semi-synthetic dairy wastewater. After a calibration and validation steps, results obtained during five months have shown that the on-line spectrophotometer sensor was able to efficiently monitor on-line nitrate, nitrite in SBR content. Ranges of detection were between 0 to 40 mg/L for nitrate and 0 to 18 mg/L for nitrite, with an accuracy of about 10 %. The on-line estimation of soluble COD was less efficient. The major drawback was the time-consumption for the cleaning of the homemade on-line filter.