Anaerobic/microaerobic combined with A/(O/A)n to enhance nitrogen and phosphorus removal of aerobic granular sludge
LI Dong1, WANG Xin-xin1, ZHANG Yu-jun3, ZHANG Jie1,2
1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; 2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; 3. China Xiong-an Group Urban Development Investment Corporation, Baoding 071000, China
Abstract：Three SBR reactors R1, R2 and R3 with the same specifications were set up, which were operated in A/O/A-A/O/A, A/O/A-A/O, and A/(O/A)n-A/O modes respectively. Using synthetic wastewater as the influent substrate, the inoculated sludge, consisting of 70% aerobic granular sludge and 30% flocculent sludge, were obtained from the laboratory for long-term starvation at 4℃. Under the same initial conditions, the activity recovery and short-cut nitrification and denitrification phosphorus removal performance of granular sludge under different operation modes were discussed. The results showed that the combined anaerobic/micro-aerobic A/(O/A)n alternating operation mode had great advantages in realizing the activity recovery of granular sludge and the performance of pollutant removal. The dense granules were formed with an average particle size of 802.98μm in R3, and the EPS content reached 94.52mg/gVSS, indicating that the alternating operation mode of combined anaerobic/microaerobic stimulated microorganisms to secrete more EPS, and the granule structure was more stable. During the stable operation period, the removal efficiency of COD, TP and TN of R3 reached 92.45%, 93.72% and 97.24% respectively. Meanwhile, the proportion of denitrifying phosphorus accumulating organisms with nitrite as electron acceptor in the system reached 51.46%, which could realize the simultaneous enrichment of AOB and DPAOs, thereby exhibiting good pollutant removal effect.
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