Intensification of biological wastewater treatment in a bioreactor

The purpose of the research was to determine the inter regeneration period of immobilized sludge by changing the species composition and its viability on the "Brush" and "Contour" type loads, as well as to assess the specific speed of wastewater treatment in the presence of immobilized and free-floating sludge. With the use of additional biomass of sludge placed on a synthetic loading, biological treatment of wastewater is carried out by various cenoses of sludge suspended in the state, and biomass attached to the loading. A synthetic loading was placed in the experimental cell of the bioreactor, where the activated sludge was sedimented. A fine-bubble aerator for aeration of the water-sludge mixture was placed at the bottom of the experimental cell. The situation of long-term operation of the bioreactor with synthetic loading with immobilized sludge without its regeneration was simulated. The kinetics of the species composition of immobilized sludge on synthetic inert loading was studied. The specific rate of wastewater treatment was calculated, and the time of the inter regeneration period of the sludge immobilized was determined. The kinetic dependence of the species composition of the biocenosis of immobilized sludge was obtained. The optimal time of the inter regeneration period for synthetic loading of the "Brush" type was determined 5–6 days, for the loading of the "Kontur" type – 3–4 days. After these periods of time, a reduction in the specific rate of wastewater treatment begins, and there is also the possibility of secondary pollution of treated water. Mathematical expressions of the dependence of the specific cleaning rate on time for various types of loading are obtained.