ABSTRACT
Soil aquifer treatment (SAT) is an economical method used for groundwater recharge, in which surface ponded reclaimed wastewater percolates through the vadose zone and water quality improves as a series of biological and physical interactions occur. This chapter discusses the successive approximation linear quadratic regulator (SALQR) method is used for determining the optimal operation of SAT systems, thus facilitating preliminary engineering analyses and reducing the cost of pilot studies. It describes the simulator used is a modified HYDRUS which describes the water content distribution, the infiltration process, and the draining process. The chapter proposes Soil aquifer treatment operation model (SATOM) converges within a few iterations, which shows that the modified constant shift method is very efficient. It describes the operation of SAT systems by an optimization method. The chapter conducts a series of numerical experiments are to determine a suitable λ value and to analyze the effect of the λ value on the convergence speed of the SALQR procedure.
