Procedures and correlations for designing and costing stripping towers for the removal of organics from aqueous streams are presented. The emphasis is on practical methods suitable for engineering estimates. The designs cover steam strippers with and without condensers and reflux, as well as air stripping. Steam stripping is treated as an isothermal process and simplified equations for the determination of tower height may be used. Determination of the height of adiabatic air strippers involves a tedious, iterative solution of heat and material balances. A BASIC computer program for carrying out these calculations is provided. Capital costs are determined, essentially, by estimating the quantity of materials required in conjunction with material costs. Cost factors for a range of materials and installation factors are suggested. Methods for costing ancillary equipment such as heat exchangers, pumps, compressors, and storage vessels are included. It is recommended that vendor quotes be obtained wherever possible. Typical operating costs for energy and maintenance are also given.