Method for removal of biofilm
AssigneeLonza Ltd.
InventorsMichael Ludensky, Philip Sweeny
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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
Claims18
A method of disintegrating biofilm, flocculent bulked sludge or bulked biologically active sludge in an aqueous system, which comprises adding to or forming in said aqueous medium containing biofilm, flocculent bulked sludge or bulked biologically active sludge one or more chlorinated hydantoins in an amount sufficient to form a concentration of from about 0.01 to 100 ppm (expressed as Cl2) of such chlorinated hydantoins in said aqueous medium.
A method of removing biofilm from a substrate in an aqueous medium which comprises:
- adding to or forming in said aqueous medium monochlorodimethylhydantoin, dichlorodimethylhydantoin, or a mixture thereof in an amount of from about 0.05 to 25 ppm (expressed as Cl2) of such chlorinated hydantoins.
A method of disintegrating flocculent bulked sludge or bulked biologically active sludge present in an aqueous medium which comprises:
- adding to or forming in said aqueous medium monochlorodimethylhydantoin, dichlorodimethylhydantoin, or a mixture thereof in an amount of from about 0.05 to 25 ppm (expressed as Cl2) of such chlorinated hydantoins.
Dependencies are inferred from the claim text.