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OPTIMIZATION OF PUMPING AND RECHARGE FOR RECLAMATION OF CONTAMINATED AQUIFER

Congress: 2008
Author(s):
J. Nambirajan Second year M.E Hydrology and Water Resources Engg. Email: jnraj2003@yahoo.co.in Centre for Water Resources, Anna University, Chennai 600 025, Tamilnadu, India.

Keyword(s): Simulation, Pump-Treat-Inject, Genetic Algorithm, Optimizer
AbstractGroundwater is a vulnerable resource. Once the groundwater gets contaminated, remediation is very difficult. So the protection of groundwater against contamination is very important. In Tamilnadu, the quality of groundwater in Noyyal River basin have very much affected due to industrial effluents released by the dyeing and bleaching industries in Tirupur. In this study, an effort is made to remediate the contaminated area of Noyyal River basin. The contaminated area is delineated through the simulation of flow and transport model using VISUAL MODFLOW and MT3D. For the remediation of contaminated area, Pump-Treat-Inject (PTI) system is proposed. In this system, contaminated water is pumped to the surface and it is treated in the treatment plant. After treatment the treated water is re-injected back into the aquifer. Water is injected into the aquifer to enhance the contaminant capturing process of a pumping well. This process is continued until the concentration of contaminants reach the normal standard. Genetic algorithm is used to arrive at the optimal locations for pumping and recharge wells to capture all the contaminants with minimum quantity of pumping and recharge. For using Genetic algorithm as an optimizer, requires coupling with the simulation model so that they execute as a single application without the necessity of interactive input during computation. To do this, two sets of executable programs are needed. The first program converts the GA output file as an input file to MODFLOW, whereas the second program takes the output from MODPATH and computes the objective function value. The coupled model runs in a loop until the selected algorithms generate an acceptable solution and a stopping criterion is met.
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