Study on the nitrogen removal capacity of multi-stage A/O-MBBR pilot scale system based on pure biofilm at medium-low temperature
The bottleneck problem of biological nitrification always exists in the activated sludge process at low temperature.In this study,a pilot-scale three-stage anoxic/oxic(A/O)moving bed biofilm reactor(MBBR)was constructed to investigate the nitrogen removal performance.Based on the nitrification ability and morphological changes of biofilm under static experimental conditions,this study analyzed the influencing factors of nitrogen remov-al of the system.The results showed that when the reaction temperature was 10-16℃,and the sewerage inflow was(23.6±5.4)m3/d,the concentration of external carbon source was 50～90 mg/L,the concentrations of SCOD,NH4+-N and TIN in the influent were(147±30),(38.3±2.1)and(39.6±2.3)mg/L respectively,and those in the effluent were(26±6),(0.4±0.6)and(6.8±3.6)mg/L respectively.The average removal rates were 82.3%,99.0%and 82.8%.The second A/O-MBBR sub-system showed a good nitrification capacity.Its nitrification removal load could reach 0.9 g/(m2·d)and NH4+-N nitrification contribution rate could reach 54%.The biofilm thickness was an important factor affecting the nitrification capacity of the biofilm.
municipal wastewatermedium-low temperaturemulti-stage anoxic/oxicMB-BRpilot scale
NETL
NSTL
万方数据
