Method for the treatment of water treatment sludge
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 7, 1997
Grant Date -
N/A
app pub date -
May 17, 1996
filing date -
Jun 17, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for the treatment of sludge obtained from such a water treatment process wherein an aluminium or iron chemical is used as a coagulant, so as to reduce the amount of sludge, which method comprises the steps of: a) treating the water treatment sludge with an inorganic acid to produce an acidic sludge comprising dissolved aluminium or iron, b) optionally separating insoluble material from the acidic sludge to produce an acidic solution comprising dissolved aluminium or iron, c) treating said acidic sludge or said acidic solution with a +1-cation compound in the presence of sulphate ions in such conditions that the pH of the sludge or solution remains at a level where aluminium precipitates as an alunite compound or iron precipitates as a jarosite compound, and d) separating the precipitated alunite or jarosite compound from the remaining sludge.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully