Zastosowanie membran bipolarnych do odzysku substancji ze ścieków przemysłowych

atche process of bipolar elctrodialysis and its pplicastion to the treatment of industrial effluents for the recovery of useful components was discussed in detail.The process was run in two different systems. On of these involved three membranes (cation-exchange,bipolar and anion-exchange),the other one two membranes(bipolar and anion-exchange),the other one two membranes(bipolar and anion-exchange or anion-exchange).The three-membrane system enabled,for example,the recovery of acid and lye from a spent etching bath,acid and amine from the effluent from flue gas desulphurization and nitrogen removal,or acid and amine recovery from wastewater following absorption of the flue gases peroduced during manufacture of aluminium moulds.The two membrane system allowed recovery of only one product - either alkali or acid. The paper also includes an account of the authoress's own investigations into acid recovery from spent etching bath,with the use of a two-membrane system,which yielded a 38% recovery at a small metal ion leakage (1.9 to 2.5%).The results obtained are compared with relevant data reported by other investigators.