Belite sludge sorption activity in regard to opportunity bacteria

The purpose of the study is to determine the sorption activity of belite sludge in vitro. The object of research is belite sludge, a waste of the Achinsk aluminum alumina plant in the Krasnoyarsk Region, contains 20 mineral elements, the main ones are: phosphorus, calcium, cobalt, zinc, manganese, copper, chromium, molybdenum, magnesium, potassium, selenium, gallium, boron, silver , gold, platinum, - as well as oxides: CaO - 0.055; Al2O3 - 0.036, Fe2O3 - 0.038 and SiO - 0.03 g/kg. The sorption activity of belite sludge was determined by the number of colony-forming units of E. coli, St. aureus with an exposure of 10, 30 and 60 minutes. Compared to the control, the relative sorption activity of belite sludge is the share of E. coli, St. aureus was noted at 60 min exposure, which corresponded to a decrease in the number of CFU by 75 and 49 %. Studies of the sorption efficiency at different exposures showed that a 75 % decrease in CFU of the E. coli strain and 49 % of the St. aureus occurred already at an exposure of 10 min; then, at long exposures, the decrease in the number of CFUs occurred insignificantly and smoothly up to the number of CFUs at an exposure of 60 min. Number of CFU St. aureus of Staphylococcus aureus in this experiment was significantly lower (5 times) than when inoculated from a 60-minute suspension, which may indicate a longer and slower absorption of this pathogen. Therefore, the use of belite sludge in the diets of farm animals and poultry as a source of minerals can help reduce the antifoam load, suppress pathogenic microflora and, as a result, improve the digestion of farm animals.