The Study On Simultaneous Nitrification And Denitrification In Membrane Bioreactor (MBR)

The paper has researched the theory of simultaneous nitrification and denitrification (SND) in Activated Sludge System and MBR which based on domestic and foreign researchs on SND. And the paper has paid more attention research on the theory of simultaneous nitrification and denitrification (SND) in MBR. The main conclusions are as follows:(1) According to the experimental results,the paper has proved that Simultaneous nitrification and denitrification(SND) can occur concurrently in Activated Sludge System and MBR. Compared SND in the Activated Sludge System with SND in MBR and found that the MBR has a higher removal efficiency of COD, ammonia and TN than the Activated Sludge System. As a whole,In the MBR is easier to realize simultaneous nitrification and denitrification (SND) than activated Sludge System ,and the effect is better.(2) The experimental results in Activated Sludge System and MBR showed that DO is a limiting factor to Simultaneous nitrification and denitrification(SND), C/N is a key factor to Simultaneous nitrification and denitrification(SND),and pH is a important factor to Simultaneous nitrification and denitrification(SND).According to the experimental results, The efficiency of simultaneous nitrification and denitrification is the best when DO concentration is 0.8mg/L-1.0 mg/L and pH is neutral to alkalescent. With reduction of COD/TN,the TN removal efficiency becomes lower. But the TN removal efficiency increasing with enhancing F/M.(3) The influence mechanism on the efficiency of nitrogen by SND in Activated Sludge System and MBR was discussed. The effects of different factors on the efficiency of nitrogen by SND in Activated Sludge System and MBR could be explained by the theory which including microscopic environment theory and microbiology theory.(4) According to the experimental results, the influence mechanism which DO and C/N affect on SND is consistent in Activated Sludge System and MBR.(5) F/M is another key factor impacting on the simultaneous nitrification and denitrification(SND).For the best efficiency of simultaneous nitrification and...