MODERN EQUIPMENT SETS FOR PRODUCTION OF DEMINERALIZED AND DEIONIZED WATER

摘要

The demand for demineralized water will continue to grow with development of productive efforts. Reserves of water resources are boundless and renewable, but water quality differs appreciably; this will have the most direct effect on the quality of the product being fabricated, and its net cost. At the present time, there are no longer any doubts that the following membrane technologies are the most economical and ecologically safe methods for the demineralization of water: reverse osmosis, ultra- and nano-filtration, and electrodeionization [1], which are following in the steps of traditional ion-exchange and thermal technologies. In membrane technologies, liquids are separated in the following manner. An initial solution is delivered under pressure onto a semi-permeable membrane, which separates it into two parts: a purified solution (filtrate, or permeate), which passes through the membrane, and a solution that does not pass though the membrane (concentrate). Particles of contaminants retained by the membrane remain in the concentrate, but since water is flowing continuously along the membrane surface, these particles are not accumulated on the membrane, but are washed from the latter by the concentrate.