Feedback Control in a Waste-Holding Tank

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This Demonstration shows the dynamics of a waste-holding tank in controlling the outlet noxious component concentration.


An effluent is contaminated by an unstable noxious waste, which is known to decompose at a rate proportional to its concentration. The effluent must then be diverted to a holding tank prior to final discharge. You can observe the influence of the decomposition constant rate on the concentration in the waste-holding tank. The equations describing this system are from [1], of which this Demonstration is a modification of the introductory example "WASTE".


Contributed by: R. Ricardo Sánchez (August 25)
Open content licensed under CC BY-NC-SA



: tank volume ()

: maximum tank volume ()

: outlet concentration of the waste component ()

: setpoint of the outlet concentration of the waste component ()


[1] J. B. Snape, I. J. Dunn, J. Ingham and J. E. Prenosil, Dynamics of Environmental Bioprocesses: Modelling and Simulation, New York: VCH, 1995.


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