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Application of Various Membrane Technology in Water Treatment(5)

Oct 08, 2017

  5, dialysis and electrodialysis

5.1 dialysis

Dialysis (Dialysis, referred to as D) is the solute in its own concentration gradient, from the membrane upstream of the film to the downstream process.

Dialysis is the earliest discovered and studied membrane separation technology, but because of its own system constraints, the dialysis process is slow, inefficient, dialysis process selectivity is not high, so the dialysis process is mainly used to remove a variety of solute solution Low molecular weight components such as hemodialysis, that is, dialysis membrane instead of kidney to remove urea, creatinine, phosphate and uric acid and other toxic low molecular weight components to relieve renal failure and uremic patients.

5.2 Electrodialysis

Electrodialysis (Electrodialysis, referred to as ED) is the role of the DC electric field, the potential difference as the driving force, the use of ion exchange membrane on the solution of the cation and the cationic selectivity, the electrolyte separated from the solution to achieve the solution concentration , Desalination, refining and purification.