—The calibration of a comprehensive mathematical
model describing algal dynamics in batch reactors has been
attempted. The mathematical model consisted of 29 variables
and 40 parameters and was described by 29 stiff differential
equations. Of the 40 parameters values, 23 values are not
known with certainty and hence need to be adjusted to obtain a
good fit between the model simulations and experimental data.
Three sets of experimental data were available for model
calibration. Each set of data consisted of time series on
evaluation of seven variables. Objective was to manipulate the
values of the adjustable parameters in the model such that
model simulations fit all three sets of experimental data
simultaneously with minimum error. The above proposition
was formulated as a multi-objective optimization problem and
solved using a genetic algorithm called NSGA-II. The code was
implemented on MATLAB and Pareto-optimal sets of
parameter values were obtained. Model simulations using
optimized parameter values do provide a better fit to the
experimental data as compared to fits that could be obtained
through adjustment of parameter values by trial and error.
—Algal growth model, genetic algorithm,
multi-objective optimization, Pareto-optimal solution.
Devesh Prakash, Sumit Kumar, and Purnendu Bose are with the Indian
Institute of Technology Kanpur, Uttar Pradesh, India (e-mail:
email@example.com, firstname.lastname@example.org, email@example.com).
Amuly Ratn was with the Indian Institute of Technology Kanpur, Uttar
Pradesh, India (e-mail: firstname.lastname@example.org).
Cite: Devesh Prakash, Amuly Ratn, Sumit Kumar, and Purnendu Bose, "Calibration of Algal Growth Model Using Multi-objective Genetic Algorithm," International Journal of Environmental Science and Development vol. 6, no. 12, pp. 901-907, 2015.