Method for controlling growth of microorganisms and/or biofilms in an industrial process

Disclosed is a method for controlling a biofilm， removing a formed biofilm and/or controlling a growth of microorganisms， preferably bacteria， in an aqueous environment of an industrial manufacturing process including a cellulosic fibre material. A compound according to Formula I is administered to the aqueous environment， in which Formula I R1， R2 and R3 independently represent a hydrogen atom; halogen atom; hydroxy group; amino group; alkylamino group， alkyl group， hydroxyalkyl group， haloalkyl group or alkoxy group having 1 to 4 carbon atoms; or an acylamido group having 1 to 10 carbon atoms; and A represents 2-thiazolamine; 2-propenenitrile; 2-propenoic acid; alkyl ester or hydroxyalkyl ester of 2-propenoic acid having 1 to 4 carbon atoms; or —CHCHCONR5R6 group， where R5 and R6 represent independently hydrogen atom， alkyl or hydroxyalkyl having 1 to 4 carbon atoms， with the proviso that the compound according to Formula I is not 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile or 4-amino-N-2-thiazolyl-benzene-sulphonamide.