Method of water treatment using polyacrylamide-phosphonate flocc

Details Method of water treatment using polyacrylamide-phosphonate flocc Method of water treatment using polyacrylamide-phosphonate flocc

1994-06-06

1995-02-28

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210734, 210928, 162 29, 1621683, 1621812, 162189, 162DIG9, C02F 156, D21F 166, D21F 182, D21C 1100

Patent

active

053934369

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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