Method for removal of biofilm

Details Method for removal of biofilm Method for removal of biofilm

2003-06-06

2008-08-05

Hruskoci, Peter A. (Department: 1797)

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

C162S161000, C210S631000, C210S755000, C210S756000, C210S764000, C422S016000, C422S037000

Reexamination Certificate

active

07407590

ABSTRACT:
The present invention provides a method for the removal of biofilm, flocculent bulked sludge or bulked biologically active sludge from an aqueous system. The method involves adding one or more chlorinated hydantoins, such as dichloro- or monochlorodialkylhydantoin, to the aqueous system. Alternatively, the chlorinated hydantoin may be formed in situ by adding a chlorine source and an alkylated hydantoin separately to the aqueous system. The invention is particularly advantageous because of the outstanding photostability of the chlorinated hydantoin solutions even when exposed to sunlight.

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European Patent Office Action dated Mar. 6, 2008, which issued in the prosecution of European Patent Application No. 03814564.5, and which corresponds to the present application.

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