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Inventor
Application No. 242249 filed on 09/28/1999
US Classes: 210/652 ,
Hyperfiltration (e.g., reverse osmosis, etc.) 210/638 ,
Including ion exchange or other chemical reaction 210/639 ,
Including prior use of additive (e.g., changing pH, etc.) 210/650 ,
Filtering through membrane (e.g., ultrafiltration) 210/651 ,
Removing specified material 210/661 ,
By passing through suspended bed 210/900 ULTRA PURE WATER (E.G., CONDUCTIVITY WATER)
Examiners Primary:
Fortuna, Ana
Attorney, Agent or Firm
Foreign Patent References 1792304 DE. 03/11/1972 2607737 DE. 09/11/1976 19603494 DE. 02/11/1998 50-75987 JP. 06/11/1975 55-012284 JP. 04/11/1980 59-112890 JP. 06/11/1984 62-204892 JP. 09/11/1987 62-294484 JP. 12/11/1987 2-207888 JP. 08/11/1990 02-227185 JP. 09/11/1990 05-012040 JP. 02/11/1993 05-269463 JP. 10/11/1993 06-049191 JP. 06/11/1994 08-029315 JP. 03/11/1996
International Class B01D 061/00
Abstract A process for treatment of water via membrane separation to remove hardness and non-hydroxide alkalinity by simultaneous removal in a weak acid cation exchange resin. The process includes ionization of sparingly ionizable components, such as silica, by adjusting the pH up to about 10.5 or higher. Their separation by the membrane is significantly increased. The passage of boron, silica and TOC is reduced by a factor of ten or more. Recovery of 90% or higher is achievable with most brackish feedwaters, while substantial reduction in cleaning frequency is simultaneously achieved. The apparatus used for the water treatment process includes reverse osmosis membrane(s) (30), mixed bed ion exchange unit (44, 46), micron filter (48), ultraviolet sterilization unit (49), decarbonation unit (20), and electrodeionization unit (150).
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Field of Search Including prior use of additive (e.g., changing pH, etc.) Hyperfiltration (e.g., reverse osmosis, etc.) Including ion exchange or other chemical reaction By passing through suspended bed Removing specified material With semipermeable membrane, e.g., dialyzer, etc. Having membrane PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED Including diverse separating or treating of liquid Filtering through membrane (e.g., ultrafiltration) ULTRA PURE WATER (E.G., CONDUCTIVITY WATER) Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere
September 28, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
