Method of water treatment using polyacrylamide-phosphonate flocculants
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United States of America Patent
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Feb 28, 1995
Issued Date -
N/A
app pub date -
Jun 6, 1994
filing date -
Feb 8, 1993
priority date (Note) -
Expired
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Abstract
A method of treating an aqueous system is disclosed. The method may be used to treat sewage streams as well as aqueous streams in pulp and paper mill processing. The method includes the steps of adding a polymeric composition to an aqueous stream. The composition is an anionically modified acrylamide polymer in an aqueous medium. The polymer is formed by reacting an acrylamide polymer with phosphorous acid, and has at least 5 mole percent phosphonate groups based on the acrylamide content of the polymer, and has a molecular weight of at least about 40,000. the pH of the composition is adjusted to at least about 7.7.
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