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The main aim of this study was to evaluate the effect of bioaugmentation on oxygen uptake rate in laboratory scale sequencing batch reactor (SBR). The commercial product Arkea® was used for bioaugmentation. Additionally, the influence of depletion of external substrate in bioaugmented and non-bioaugmented activated sludge was investigated. The Arkea® dose used in the test was 0.4 dm3. The experiment was carried out in two identical sequencing batch reactors (A - bioaugmented and B - non bioaugmented activated sludge), each with the volume of 8 dm3. SBRs were inoculated with activated sludge from biological reactor of municipal wastewater treatment plant (MWWTP) in Lublin. The study was divided into two phases. In the first one, oxygen uptake rate was measured during average biological treatment in SBRs. However, in the second part of investigation (after 5 days) activated sludge was only aerated, in the absence of substrate (25 days). It was observed that bioaugmentation with Arkea® has a positive effect on endogenous and exogenous oxygen uptake rate of sludge in both phases of experiment. In the first phase, the average endogenous oxygen uptake rate was 23.5 ± 6.4 mgO2 dm-3 h-1, in bioaugmented activated sludge, whereas 18.5 ± 5.4 mgO2 dm-3 h-1 in non bioaugmented activated sludge, respectively. In case of the exogenous oxygen uptake rate, the average value was 92.9 ± 16.0 mgO2 dm-3 h-1 in bioaugmented activated sludge and 67.9 ± 17.4 mgO2 dm-3 h-1 in non bioaugmented activated sludge. In the second phase, the average OURend was 11.6 ± 4.2 mgO2 dm-3 h-1, in bioaugmented activated sludge and 9.5 ± 3.8 mgO2 dm-3 h-1 in non-bioaugmented activated sludge. In case of OURexo, the average value was 27.8 ± 10.7 mgO2 dm-3 h-1 in bioaugmented activated sludge and 20.1 ± 12,4 mgO2 dm-3 h-1 in non bioaugmented activated sludge.
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