@TechReport{	  it:2013-021,
  author	= {Bengt Carlsson and Jes{\'u}s Zambrano},
  title		= {Fault Detection and Isolation of Sensors in Aeration
		  Control Systems -- the Airflow Ratio Method},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Systems and Control},
  year		= {2013},
  number	= {2013-021},
  month		= oct,
  abstract	= {In this paper, we consider the problem of detecting sensor
		  faults in the aeration system of an activated sludge
		  process. The purpose is to detect possible faults in the
		  dissolved oxygen sensors. The dissolved oxygen
		  concentration in each aerated zone is assumed to be
		  automatically controlled. As the basis for a fault
		  detection algorithm we propose to use the ratio of air flow
		  rates into different zones. The method is evaluated by
		  using the Benchmark Simulation Model n^{o}1 (BSM1) via
		  Monte Carlo simulations. Results show that this method
		  gives a good performance in terms of correct an early fault
		  detection and isolation.}
}