Completely Autotrophic N-removal In A Sub-membrane Bioreactor

ANAMMOX (Anaerobic Ammonium Oxidation) is the most hopefully biologic N-removal reaction. Due to needless of Carbon source and short-route transform of N, it has been hot in the N-removal research.The slowly growth rate of ANAMMOX biomass hold out its application therefore.In this research, an internal circulating sub-membrane bio-reactor was build to study Completely Autotrophic N-removal Over Nitrite (CANON) based ANAMMOX reaction.In the experiment of inoculation with nitrobacteria, TN removal efficiency is ascending during the process, from 14% (start-up) to 62% (the 100th day) and the anaerobic ammonia oxidation activity of microorganism in the reactor achieved 0.07 kgN/kgSS.d.In the experiment of inoculation with ANAMMOX microorganism, TN removal efficiency was maintained as 60%, with the anaerobic ammonia oxidation activity, the aerobic ammonia oxidation and the aerobic nitrite oxidation of 0.03 kgN/kgSS.d, 0.11 kgN/kgSS.d and 0.01 kgN/kgSS.d respectively.Results showed that a steady symbiotic system with nitrite-bacteria and ANAMMOX biomass was build. With the inhibition of nitrobacteria, a route of nitration over nitrite realized.In this paper the oxygen utilization efficiency of the MBR was investigated, and the data indicate that this sub-membrane bioreactor is feasible to CANON process with its good reservation and oxygen transform efficiency.