Method for recovering and treating brine from water softener regeneration
US4207397A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Sep 15, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J49/75
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Cation exchange water softeners may be regenerated and, then, the regenerant wastes (brine) 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 the brine treatment tank, the precipitate being disposed of as a sludge or sludge cake and the supernatant being recycled to the water softener at the time of further regeneration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.