Effect of influent C/N ratio on simultaneous nitrification-denitrification and phosphorus removal (SNDPR) enriched with phosphorus accumulating organisms (PAOs)
Abstract:This study focused on the elucidation of the mechanisms of nitrogen and phosphorus removal in simultaneous nitrification-denitrification and phosphorus removal (SNDPR) systems enriched with phosphorus accumulating organisms (PAOs). An extended anaerobic (aeration duraction: 180min)/low aerobic (dissolved oxygen: 0.5~1.0mg/L) sequencing batch reactor (SBR) fed with domestic wastewater was studied for SND (simultaneous nitrification-denitrification) efficiency of SNDPR under different C/N ratios (3, 4, 8, and 11) adjusted by adding sodium acetate into the domestic waster. The experimental results showed that the phosphorus removal efficiency was not affected by influent C/N ratios with an effluent PO43--P concentration lower than 0.3mg/L, which might be caused by the enriched PAOs capable of achieving a simultaneous aerobic phosphorus uptake and denitrifying phosphorus uptake at the low aerobic phase. In contrast, effluent NH4+-N concentration increased with the C/N ratio and the effluent NO3--N concentration increased with the decrease of C/N ratio. The consumption of chemical oxygen demand (COD) for exogenous denitrification increased with the decease in C/N ratio. The storage capacity of PHAs (poly-hydroxyalkanoates) for SND was reduced, but its utilization of PHV (Volatile fatty acids) was increased. SND efficiency reach the peak value of 50.8% at the C/N ratio of 4~8, and total nitrogen (TN) removal efficiency reached 80.8% at the C/N ratio of 8.
戴娴, 王晓霞, 彭永臻, 王淑莹. 进水C/N对富集聚磷菌的SNDPR系统脱氮除磷的影响[J]. 中国环境科学, 2015, 35(9): 2636-2643.
DAI Xian, WANG Xiao-Xia, PENG Yong-Zhen, WANG Shu-Ying. Effect of influent C/N ratio on simultaneous nitrification-denitrification and phosphorus removal (SNDPR) enriched with phosphorus accumulating organisms (PAOs). CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2636-2643.