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

A method for controlling a biofilm, for removing a formed biofilm and/or for controlling a growth of microorganisms in an aqueous environment of an industrial manufacturing process comprising a cellulosic fibre material and having a temperature of at least 40° C. and being selected from manufacture of paper, board, pulp, tissue, moulded pulp, or non-woven, the method comprising:

• adding continuously or periodically into the aqueous environment, a composition comprising a compound according to
• wherein
• 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 said compound is not 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile or 4-amino-N-2-thiazolyl-benzenesulphonamide.