Electrodialysis device and process

An electrodialysis process using an electrodialysis device, the process comprising a plurality of cycles, at least one of the plurality of cycles comprising:

• a deionization stage, in which a direct current power supply passes a forward electrical direct current signal with a forward current density (If) to a first positive and a second negative electrode for a first duration (t1), so as to power the first positive electrode and second negative electrode;
• and
• a recovering stage, in which the power supply sends a reverse electrical direct current signal with a first reverse current density (Ir) to each of the first and the second electrodes in a direction opposite to the forward electrical direct current signal for a second duration (t2), and
• the frequency of each cycle of the pluralities of cycles over an operating period is in a range of about 100 hertz to about 10 kilohertz,
• wherein the process further comprises at least one reversing stage between two cycles, the power supply passing a second reverse electrical direct current signal with a second reverse current density (Ip) to the first and second electrodes in a direction contrary to the forward electrical direct current signal for a duration (t4), the second reverse current density (Ip) being larger than the first reverse current density (If).