Biogenosis Survival оf Active Sludge when Stressed by Chemical Mutagen
Biological methods for treating household wastewater under aerobic conditions due to their effectiveness have gained significant popularity. However, possible malfunctions in the operation of biological wastewater treatment plants - major emissions and high loads of toxic substances lead to the death of active sludge biocenosis. In such cases, the performance of wastewater treatment facilities depends on the survival of microorganisms. The use of mutagenesis for the cultivation of toxic substances resistant to microorganisms in the biocenosis of active sludge, which, because of their vital activity, ensures the destruction of these substances, seems to be an important area of research. It has been established that with dosed stress activation of active sludge by chemical mutagenic S2- in various concentrations under conditions of intensive aeration and nutrient nutrition, successions in the biocenosis occur - a decrease of predators and an increase of protozoa that can survive in new environmental conditions and satisfactorily nitrify pollutants in wastewater.
Keywords: biological wastewater treatment, active sludge biocenosis, stress exposure, chemical mutagen, survival, adaptation, modeling, sludge residue.