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Title: Water softening process

Abstract

This invention involves an improved process for softening hard water which comprises selectively precipitaing CaCO.sub.3 to form a thin layer thereof, increasing the pH of said water to precipitate magnesium as magnesium hydroxide and then filtering the resultant slurry through said layer. The CaCO.sub.3 layer serves as a thin permeable layer which has particularly useful application in cross-flow filtration applications.

Inventors:
 [1];  [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
862620
Patent Number(s):
3976569
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
water; softening; process; involves; improved; hard; comprises; selectively; precipitaing; caco; form; layer; increasing; ph; precipitate; magnesium; hydroxide; filtering; resultant; slurry; serves; permeable; particularly; useful; application; cross-flow; filtration; applications; layer serves; improved process; particularly useful; useful application; magnesium hydroxide; permeable layer; cross-flow filtration; /210/

Citation Formats

Sheppard, John D, and Thomas, David G. Water softening process. United States: N. p., 1976. Web.
Sheppard, John D, & Thomas, David G. Water softening process. United States.
Sheppard, John D, and Thomas, David G. Thu . "Water softening process". United States. https://www.osti.gov/servlets/purl/862620.
@article{osti_862620,
title = {Water softening process},
author = {Sheppard, John D and Thomas, David G},
abstractNote = {This invention involves an improved process for softening hard water which comprises selectively precipitaing CaCO.sub.3 to form a thin layer thereof, increasing the pH of said water to precipitate magnesium as magnesium hydroxide and then filtering the resultant slurry through said layer. The CaCO.sub.3 layer serves as a thin permeable layer which has particularly useful application in cross-flow filtration applications.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {1}
}

Patent:

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