Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/ Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment |
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Authors: | HU Xiang XIE Li SHIM Hojae ZHANG Shanfa YANG Dianhai |
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Affiliation: | 1.State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China;2.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, China;3.Shanghai Urban Construction Design and Research Institute, Shanghai 200125, China |
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Abstract: | A novel full scale modified A2O (anoxic/anaerobic/aerobic/pre-anoxic)-membrane bioreactor (MBR) plant combined with the step feed strategy was operated to improve the biological nutrient removal (BNR) from low C/N ratio municipal wastewater in Southern China. Transformation of organic carbon, nitrogen and phosphorus, and membrane fouling were investigated. Experimental results for over four months demonstrated good efficiencies for chemical oxygen demand (COD) and NH4+-N removal, with average values higher than 84.5% and 98.1%, respectively. A relatively higher total nitrogen (TN) removal efficiency (52.1%) was also obtained at low C/N ratio of 3.82, contributed by the configuration modification (anoxic zone before anaerobic zone) and the step feed with a distribution ratio of 1:1. Addition of sodium acetate into the anoxic zone as the external carbon source, with a theoretical amount of 31.3 mg COD per liter in influent, enhanced denitrification and the TN removal efficiency increased to 74.9%. Moreover, the total phosphate (TP) removal efficiency increased by 18.0%. It is suggested that the external carbon source is needed to improve the BNR performance in treating low C/N ratio municipal wastewater in the modified A2O-MBR process. |
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Keywords: | biological nutrient removal low C/N ratio wastewater membrane bioreactor denitrification external carbon source |
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