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The corrosive biofilm is formed on metal surfaces of wastewater treatment plants. The numbers of sulfate-reducing and ammonifying bacteria (up to 109 cell/cm3 and up to 108 cell/cm3, respectively) are dominant in this film, while the quantity of acidophobic tionic bacteria is the smallest (up to 102 cell/cm3). The relationship between the bacteria-produced hydrogen sulfide and the measure of wastewater...