A sequencing batch reactor (SBR) is a type of activated sludge system, which is nowadays successfully used for the treatment of communal and industrial wastwater. SBR reactors often contain bio-selectors, which comprise of optimal conditions for the growth of floc-forming bacteria (providing good conditions for sludge settleability) and infavourable conditions for the growth of filamentous bacteria. In the dissertation I described the grounds for the ramifying of filamentous microorganisms and found solutions for decreasing their amount in activated sludge. At the same time I presented the process of biological treatment of wastewater with the active selector in the SBR process, with the intent to prevent bulking and foaming of the sludge.
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