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A sulphate-reducing culture of the genus Desulfovibrio was directly inhibited by the hydrogen sulphide (H2S) produced. Batch experiments carried out at pH 6.2 and 6.6 show that complete inhibition is achieved for almost the same H2S concentration of approximately 550 mg/l.

To define some aspects of the biological corrosion sulphate-reducing bacteria were studied in paper machine waters and in plugged perforations of a suction roll. The desulphuricants were most active on passive fiber recipients. Most bacteria found in fiber plugs taken from the perforations of suction rolls belonged to the genus Desulfovibrio. Desulphuricants were found mainly at the outer ends of plugged perforations, where corrosion of the roll metal is most evident.