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

缺氧/厌氧/好氧/预缺氧-MBR组合工艺对低碳氮比市政污水中营养盐去除的研究(英文)

作　　者：胡香 谢丽 SHIM Hojae 张善发 杨殿海 

机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse, Tongji University [2]Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macao, Taipa, Macao SAR, China [3]Shanghai Urban Construction Design and Research Institute

出　　处：《Chinese Journal of Chemical Engineering》2014年第4期447-454,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Water Pollution Control and Management(2008ZX07316-002);the University of Macao Research Committee(RG067/09-10S/SHJ/FST)

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%, re-spectively. 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 in-creased 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 waste-water in the modified A^2O-MBR process.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 4NH-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 in-creased 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 

分 类 号：O652[理学—分析化学] X703.1[理学—化学]