The first part of this survey described the fundamentals and the basic equations for the mathematical modelling of electromembrane processes. In the second part a number of applications is considered. First mass transfer in ion exchange membranes is discussed. Further points are electrodialysis with bipolar membranes for the production of acid and base from a salt solution and some recent developments for the combination of electrodialysis and ion exchange. Electrodialyse with bipolar membranes allows the recycling of acids or bases from acid or base scrubbersand can also be used for electrochemical reactions in non-aqueous media. Combination of electrodialysis and ion exchange permits a continuous operation of ion exchange columns with simultaneous regeneration using ion exchange membranes. This results in low consumption of regeneration chemicals and the minimisation of waste products.