Abstract
AbstractSequencing batch reactor systems in wastewater treatment is widely applied activated sludge technology. The system performance is not only dependent on the raw sewage quality and biochemical processes, but the flow pattern within the reactor has a significant impact on the treatment itself. The varying stages of the operation require different fluid flow conditions; biological stage shall be appropriately mixed, whereas low velocity zones favor the phase separation. The aim of this study was to improve sequencing batch reactor operation in order to optimize the treatment efficiency. Numerical fluid dynamic simulations were performed to determine the substrate and biomass homogeneity inside the reactor at the biological phase and the rate of the decantation was estimated at the sedimentation phase. The settling model was calibrated by field measurements. The results revealed that the hydraulic efficiency of the reactor was 87% and the achievable settled solid content was 0.9%.
Highlights
Sequencing Batch Reactor (SBR) gained popularity in wastewater treatment since it is a single tank design, flexible system, with relatively easy automation [1]
Calibration method was detailed in the previous section; the equivalent diameter was determined iteratively in the Computational Fluid Dynamics (CFD) simulations
Batch wastewater treatment applications proved its efficiency in the last few decades
Summary
Sequencing Batch Reactor (SBR) gained popularity in wastewater treatment since it is a single tank design, flexible system, with relatively easy automation [1]. The treatment stages are separated by time. Prior the batch reactor an equalization tank may be required depending on the actual flow variation and the number of the parallel applied SBRs. In large capacity plants, where more than three tanks are in operation, the incoming flow may be filled to one of the units at all time and equalization tank is not required. Biological stage is designated to remove organic matter and nutrients from the wastewater. Aerobic microorganisms are responsible for organic component degradation and nitrification, anoxic condition is required for denitrification, whereas anaerobic-aerobic varying environment facilitate the phosphorous accumulating biomass growth [2]
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