Finding solutions Activated carbon treatment 1 Adsorption method 1 Ammonia 1 Conjugate gradient 1 Conjugate gradient method 1 Conjugate-gradient method 1 Costs 1 Eggshell wastes 1 Filter media 1 Filters (for fluids) 1 Filtration 1 Global conver-gence 1 Low-cost adsorbents 1 Materials costs 1 Nonlinear conjugate gradient algorithms 1 Nonlinear programming 1 Numerical methods 1 Portfolio selection 1 Portfolio selection problems 1 Replacement materials 1 Solid particles 1 Strong wolfe line search 1 Unconstrained optimization 1 Wastewater treatment 1 Wolfe line searches 1 Zeolites 1 global convergence 1 portfolio selection 1 strong Wolfe line search 1