Bacterial microflora of nitrogen industry wastewaters

The quantitative and qualitative composition of heterotrophic bacteria found in two types of wastewaters from the nitrogen industry was determined. The number of bacteria in the wastewaters was 10(4) to 10(6) cells/ml. Gram-negative bacteria accounted for 57% of the bacteria in the final retention reservoir whereas their number in the wastewaters discharged into surface waters was 90%. The dominating species among the Gram-negative bacteria was Pseudomonas, irrespective of the composition of the wastes and means by which they were discharged into the Wisła. The studied microflora utilized in different metabolic processes nitrogen compounds present in the wastes.