Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment

doi:10.1016/S1004-9541(14)60064-1

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (4): 447-454.DOI: 10.1016/S1004-9541(14)60064-1

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles Next Articles

Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment

HU Xiang¹, XIE Li¹, SHIM Hojae², ZHANG Shanfa³, YANG Dianhai¹

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

Received:2012-10-06 Revised:2013-04-12 Online:2014-04-04 Published:2014-04-28
Supported by:
Supported by the National Water Pollution Control and Management (2008ZX07316-002) and the University of Macau Research Committee (RG067/09-10S/SHJ/FST).

Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment

胡香¹, 谢丽¹, SHIM Hojae², 张善发³, 杨殿海¹

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

通讯作者: XIE Li
基金资助:
Supported by the National Water Pollution Control and Management (2008ZX07316-002) and the University of Macau Research Committee (RG067/09-10S/SHJ/FST).

Abstract

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.

Key words: biological nutrient removal, low C/N ratio wastewater, membrane bioreactor, denitrification, external carbon source

摘要： 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.

关键词: biological nutrient removal, low C/N ratio wastewater, membrane bioreactor, denitrification, external carbon source

HU Xiang, XIE Li, SHIM Hojae, ZHANG Shanfa, YANG Dianhai. Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment[J]. Chin.J.Chem.Eng., 2014, 22(4): 447-454.

胡香, 谢丽, SHIM Hojae, 张善发, 杨殿海. Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment[J]. Chinese Journal of Chemical Engineering, 2014, 22(4): 447-454.

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Biological Nutrient Removal in a Full Scale Anoxic/Anaerobic/Aerobic/Pre-anoxic-MBR Plant for Low C/N Ratio Municipal Wastewater Treatment

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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