Using partial nitrification and anammox to remove nitrogen from low-strength wastewater by co-immobilizing biofilm inside a moving bed bioreactor

R Chen, Y Takemura, Y Liu, J Ji… - ACS Sustainable …, 2018 - ACS Publications
R Chen, Y Takemura, Y Liu, J Ji, S Sakuma, K Kubota, H Ma, YY Li
ACS Sustainable Chemistry & Engineering, 2018ACS Publications
The stable operation of partial nitrification and anammox (PNA) process is a challenge in
nitrogen removal from extremely low-strength ammonia wastewater like sewage
mainstream. A moving bed reactor with functional carriers (30% filling rate) was developed
to treat a synthetic influent with 50 mg/L ammonia. The long-term operation results showed
nitrogen removal efficiencies of 71.7±9.1% have been stably obtained under a relatively
short hydraulic retention time of 2 h. Microbial analysis revealed anammox bacteria and …
The stable operation of partial nitrification and anammox (PNA) process is a challenge in nitrogen removal from extremely low-strength ammonia wastewater like sewage mainstream. A moving bed reactor with functional carriers (30% filling rate) was developed to treat a synthetic influent with 50 mg/L ammonia. The long-term operation results showed nitrogen removal efficiencies of 71.7 ± 9.1% have been stably obtained under a relatively short hydraulic retention time of 2 h. Microbial analysis revealed anammox bacteria and ammonium oxidizing bacteria (AOB) with 29.7% and 6.32% abundance were the two most dominant bacteria in the reactor. Carriers largely retained slow-growing anammox bacteria in their hollow space and established a sandwich-like biofilm structure of co-immobilization of anammox bacteria and AOB. The anammox activity was much higher in carrier biofilms than in suspended flocs, while, for the AOB activity, the situation was reversed. Correspondingly, a fluorescent in situ hybridization analysis illustrated the active cell fractions of anammox bacteria and AOB in carrier biofilms were 63.7% and 4.8%, and 2.7% and 61.4% in suspended flocs. Biofilm formation and dissolved oxygen control were deemed to be the two key factors affecting the optimal co-immobilization of anammox bacteria and AOB, which guaranteed the efficient PNA.
ACS Publications
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