Effects of different external carbon sources and electron acceptors on interactions between denitrification and phosphorus removal in biological nutrient removal processes |
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| Authors: | Xiang Hu Dominika Sobotka Krzysztof Czerwionka Qi Zhou Li Xie Jacek Makinia |
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| Institution: | 1.Anhui Guozhen Environmental Protection Sci. & Tech. Co., Ltd.,Hefei,China;2.Faculty of Civil and Environmental Engineering,Gdansk University of Technology,Gdansk,Poland;3.State Key Laboratory of Pollution Control and Resources Reuse,Tongji University,Shanghai,China |
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| Abstract: | The effects of two different external carbon sources (acetate and ethanol) and electron acceptors (dissolved oxygen, nitrate, and nitrite) were investigated under aerobic and anoxic conditions with non-acclimated process biomass from a full-scale biological nutrient removal-activated sludge system. When acetate was added as an external carbon source, phosphate release was observed even in the presence of electron acceptors. The release rates were 1.7, 7.8, and 3.5 mg P/(g MLVSS·h) (MLVSS: mixed liquor volatile suspended solids), respectively, for dissolved oxygen, nitrate, and nitrite. In the case of ethanol, no phosphate release was observed in the presence of electron acceptors. Results of the experiments with nitrite showed that approximately 25 mg NO2-N/L of nitrite inhibited anoxic phosphorus uptake regardless of the concentration of the tested external carbon sources. Furthermore, higher denitrification rates were obtained with acetate (1.4 and 0.8 mg N/(g MLVSS·h)) compared to ethanol (1.1 and 0.7 mg N/(g MLVSS·h)) for both anoxic electron acceptors (nitrate and nitrite). |
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