# American Institute of Mathematical Sciences

December  2013, 2(4): 723-731. doi: 10.3934/eect.2013.2.723

## Optimal control of a diffusion/reaction/switching system

 1 Department of Mathematics and Statistics, University of Maryland Baltimore County (UMBC), Baltimore, MD 21250

Received  November 2012 Revised  June 2013 Published  November 2013

We consider an optimal control problem involving the use of bacteria for pollution removal where the model assumes the bacteria switch instantaneously between active and dormant states, determined by threshold sensitivity to the local concentration $v$ of a diffusing critical nutrient; compare [7], [3], [6] in which nutrient transport is convective. It is shown that the direct problem has a solution for each boundary control $ψ = ∂v/∂n$ and that optimal controls exist, minimizing a combination of residual pollutant and aggregated cost of the nutrient.
Citation: Thomas I. Seidman. Optimal control of a diffusion/reaction/switching system. Evolution Equations & Control Theory, 2013, 2 (4) : 723-731. doi: 10.3934/eect.2013.2.723
##### References:
 [1] T. C. Hazen, Cometabolic Bioremediation (Ch. 7, pp. 2505-2514) and In Situ Groundwater Bioremediation (Ch. 13, pp. 2583-2596), in Handbook of Hydrocarbon Lipid Microbiology, (2010). Google Scholar [2] M. A. Krasnosel'skĭi and A. V. Pokrovskiĭ, Systems with Hysteresis,, Translated from the Russian by Marek Niezgódka. Springer-Verlag, (1989). doi: 10.1007/978-3-642-61302-9. Google Scholar [3] S. Lenhart, T. I. Seidman and J. Yong, Optimal control of a bioreactor with modal switching,, Math. Models Methods in Appl. Sci., 11 (2001), 933. doi: 10.1142/S0218202501001185. Google Scholar [4] R. D. Norris, et al., Handbook of Bioremediation,, Lewis Publishers, (1994). Google Scholar [5] T. I. Seidman, Switching systems: Thermostats and periodicity,, Math. Res. Report 83-07, 83-07 (1983), 83. Google Scholar [6] T. I. Seidman, A 1-dimensional bioremediation model with modal switching,, in Control of Distributed Parameter and Stochastic Systems, (1999), 127. Google Scholar [7] T. I. Seidman, A convection/reaction/switching system,, Nonlinear Anal. - TMA, 67 (2007), 2060. doi: 10.1016/j.na.2006.08.050. Google Scholar [8] T. I. Seidman, Some aspects of modeling with discontinuities,, Int'l. J. Evolution Eqns., 3 (2009), 419. Google Scholar [9] G. Stampacchia, Equations Elliptiques Du Second Ordre á Coefficients Discontinues,, (French) Séminaire de Mathématiques Supérieures, (1965). Google Scholar [10] E. Venkataramani and R. Ahlert, Role of cometabolism in biological oxidation of synthetic compounds,, Biotechnology and Bioengineering, 27 (1985), 1306. doi: 10.1002/bit.260270906. Google Scholar [11] A. Visintin, Differential Models of Hysteresis,, Applied Mathematical Sciences, (1994). Google Scholar

show all references

##### References:
 [1] T. C. Hazen, Cometabolic Bioremediation (Ch. 7, pp. 2505-2514) and In Situ Groundwater Bioremediation (Ch. 13, pp. 2583-2596), in Handbook of Hydrocarbon Lipid Microbiology, (2010). Google Scholar [2] M. A. Krasnosel'skĭi and A. V. Pokrovskiĭ, Systems with Hysteresis,, Translated from the Russian by Marek Niezgódka. Springer-Verlag, (1989). doi: 10.1007/978-3-642-61302-9. Google Scholar [3] S. Lenhart, T. I. Seidman and J. Yong, Optimal control of a bioreactor with modal switching,, Math. Models Methods in Appl. Sci., 11 (2001), 933. doi: 10.1142/S0218202501001185. Google Scholar [4] R. D. Norris, et al., Handbook of Bioremediation,, Lewis Publishers, (1994). Google Scholar [5] T. I. Seidman, Switching systems: Thermostats and periodicity,, Math. Res. Report 83-07, 83-07 (1983), 83. Google Scholar [6] T. I. Seidman, A 1-dimensional bioremediation model with modal switching,, in Control of Distributed Parameter and Stochastic Systems, (1999), 127. Google Scholar [7] T. I. Seidman, A convection/reaction/switching system,, Nonlinear Anal. - TMA, 67 (2007), 2060. doi: 10.1016/j.na.2006.08.050. Google Scholar [8] T. I. Seidman, Some aspects of modeling with discontinuities,, Int'l. J. Evolution Eqns., 3 (2009), 419. Google Scholar [9] G. Stampacchia, Equations Elliptiques Du Second Ordre á Coefficients Discontinues,, (French) Séminaire de Mathématiques Supérieures, (1965). Google Scholar [10] E. Venkataramani and R. Ahlert, Role of cometabolism in biological oxidation of synthetic compounds,, Biotechnology and Bioengineering, 27 (1985), 1306. doi: 10.1002/bit.260270906. Google Scholar [11] A. Visintin, Differential Models of Hysteresis,, Applied Mathematical Sciences, (1994). Google Scholar
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