Methodological guide to hydrobiological control of filamentous microorganisms of activated sludge
Abstract
Methodological guide to hydrobiological control of filamentous microorganisms of activated sludge
Incoming article date: 20.03.2019The article presents the results of a study of activated sludge, which purifies domestic wastewater from nitrogen compounds under conditions of low concentrations of dissolved oxygen in the bioreactor (concentration at the level of 0.2-0.7 mg / dm3). The studies were carried out in laboratory and semi-production conditions on the models of circulating aeration facilities. Research methods included optical, electron and fluorescence microscopy, laser diffraction method and real-time polymerase chain reaction method. As a result of research, the composition and condition of the main indicator microorganisms of activated sludge, the structure of floccules of activated sludge, including the distribution of sizes of floccules depending on various technological conditions of the process, the cause of filamentous swelling of activated sludge in cases of disturbance of the system’s stability, as well as the number of functional bacteria genes archaea associated with the processes of nitrification and denitrification. Separately, research was carried out on the sedimentation properties of activated sludge, which includes the determination of sedimentation rates of activated sludge under the conditions of the mutual influence of floccules and biofloculation potential. Studies were performed both for experimental activated sludge, working with simultaneous nitrification and denitrification with low concentrations of dissolved oxygen, and for the control nitrifying activated sludge, taken from existing treatment plants operating according to the traditional technological scheme of denitrienitrification.
Keywords: nitrification, denitrification, activated sludge, aerotank, oxidation ditch, biological treatment, domestic wastewater, low oxygen treatment method, energy saving, resource saving, ecology