Nitrogen and phosphorus removal performance comparison between A2O and A2O+BCO system
ZHAO Wei-hua1,2, WANG Mei-xiang3, LI Jian-wei1, FENG Yan1, LIU Bo1, LI Xi-yao1, PENG Yong-zhen1
1. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China; 2. School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China; 3. Beijing Drainage Group Technology Research and Development Center, Beijing 100044, China
Abstract：A2O and A2O+BCO process were employed to treat domestic wastewater with low carbon to nitrogen ratio (C/N=3.96) to compare their nutrient removal performance,respectively. The influent loading and operation condition were kept consistent for 134 days, A2O+BCO system achieved a higher nitrogen and phosphorus removal efficiency than A2O system because of the application of denitrifying phosphorus removal technology and two-sludge theory, which could use carbon resource more efficiently and solve the SRT contradiction between nitrifiers and PAOs. PAOs accounts for 22% in the stable A2O+BCO system higher than 7% in the A2O system, which explain the mechanism for the superior nutrient removal performance.
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