METHOD FOR RECOVERING AND TREATING BRINE FROM WATER SOFTENER REGENERATION

摘要

A cation exchange water softener (30) may be regenerated and, then, the regenerant wastes (brine) are recovered, treated, and recycled. The result is a closed system which is ecologically beneficial. The regenerant brine is captured in as concentrated a form as possible and then treated with a precipitant such as sodium or potassium carbonate or mixtures of sodium or potassium carbonate with sodium or potassium hydroxide. Calcium and magnesium compounds are precipitated and the supernatant contains sodium or potassium chloride. These are separated within a brine treatment tank (26), the precipitate being disposed of as a slude or sludge cake and the supernatant being recycled to the water softener (30) at the time of further regeneration.