The separation membrane techniques in which an external electric field is applied as a driving force, such as electrodialysis, electro-electrodialysis, and membrane electrolysis, are shortly described and their application in environment protection is presented. Attention was focused on recovery of valuable chemicals from effluents and waste gases. Examples of new production method that eliminate environment polluting intermediate or by-products are presented. Possibility of the use of bipolar membrane is emphasized. The application of ion-exchange membranes in "green" power sources is also discussed.