Reliability-Constrained Optimization of Water Treatment Plant Design Using Genetic Algorithm
Publication: Journal of Environmental Engineering
Volume 136, Issue 3
Abstract
A new approach that links genetic algorithm (GA) as an optimization tool with Monte Carlo simulation (MCS)-based reliability program is presented for reliability-constrained optimal design of water treatment plant (WTP). The reliability of a WTP is defined as the probability that it can achieve the desired effluent water quality standard (WQS). The objective function minimizes the treatment cost, subjected to design and performance constraints, and to achieve desired reliability level for meeting the given effluent WQS. The random variables used to generate the reliability estimates are suspended solids (SS) concentration, flow rate, specific gravity of floc particle, temperature of raw water, sedimentation basin performance index, and model coefficients. The application of GA-MCS approach for design of a WTP is illustrated with a hypothetical case study. The annualized cost of WTP is affected by the number of uncertain parameters included in the analysis, coefficient of variation of uncertain parameters, effluent WQS, and target reliability level. Analysis suggests that higher reliability at lower annual cost of treatment can be achieved by limiting the fluctuation of uncertain parameters. Results show that distribution of effluent SS is also affected by the uncertainty. The suggested GA-MCS approach is efficient to evaluate treatment cost-reliability tradeoff for WTP. Results demonstrate that the combination of GA with MCS is an effective approach to obtain the reliability-constrained optimal/near-optimal solution of WTP design problem consistently.
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Acknowledgments
The writers gratefully thank Dr. Rajesh Gupta, professor, Civil Engineering, VNIT, Nagpur for review and useful comments on the paper.
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Published In
Journal of Environmental Engineering
Volume 136 • Issue 3 • March 2010
Pages: 326 - 334
Copyright
© 2010 ASCE.
History
Received: Jul 30, 2009
Accepted: Aug 24, 2009
Published online: Aug 26, 2009
Published in print: Mar 2010
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