Authors: Yoshinobu Tanaka (IEM Research, Ibaraki, Japan
Abstract: A batch process is applicable to the operation of small- or middle scale electrodialysis operations; Kusakari et al.  installed a commercial multistage batch system electrodialysis plant for desalination of brackish ground water at Hatsushima, Atami, Shizuoka Pref. Japan. Tani et al.  developed a seawater desalination batch mode unit operated in a vessel. Rapp and Pfromm  removed chloride from the chemical recovery cycle of a kraft pulp mill. Resbeut et al.  demineralized phenylalanine solutions using a batch electrodialysis unit. Elidaoui et al.  demineralized sugar liquor in a beet sugar manufacturing pilot plant. Banasiak et al.  investigated the removal of fluoride and nitrate from brackish ground water. Walha et al.  demineralized brackish ground water by nanofiltration, reverse osmosis and electrodialysis in Tunisia and compared their energy consumption. Kabey et al. removed fluoride  and boron  in a salt solution with a batch electrodialyzer. The performance of a batch process has been discussed from various view points; Parulekar  investigated energy consumption of batch operations such as (1) constant current, (2) constant voltage, (3) constant current followed by constant voltage, (4) constant voltage followed by constant current, (5) operation with time-variant current and voltage. Demircioglu et al  introduced equations expressing the ionic mass balance around a diluate circulation tank and discussed energy consumption in a batch process. Ahmed et al.  developed a mathematical model to predict changes in contaminants with time, and to estimate contaminant fluxes of migration, diffusion and convection in a laboratory-scale batch electrodialysis cell for the regeneration of contaminated hard-chrome plating baths. Moon et al.  predicted the performance of one- and two-dimensional continuous and batch electrodialysis processes based on the fundamental principles of electrochemistry, transport phenomena, and thermodynamics. Ortiz et al.  developed a mathematical model for a batch process and discussed mass balance, ohmic drop and membrane potential. This chapter describes the computer simulation of a batch process [Tanaka, 2009].