Biological Nitrogen Removal Database
A manually curated data resource for microbial nitrogen removal
Biological Nitrogen Removal Database
A manually curated data resource for microbial nitrogen removal
Influent:Synthetic wastewater
Anammox system:nan
Anammox reactor:Upflow biofilm reactor (UBF)
Medium:String-shaped three-dimensional plastic media
Culture taken from:Full-scale UASB reactor for treatment of paper mill wastewater
Microorganism cultured:nan
Respiration:Anaerobic
Electron donor:Ammonium sulfate ((NH4)2SO4)
Electron acceptor:Sodium Nitrite (NaNO2)
PH:6.8–7.0
Maximum sludge concentration:0.243
HRT:9.1 h
NH4–N Influent conc(mg/L):300
NO2–N Influent conc(mg/L):350
SO4–S Influent conc(mg/L):nan
NH4–N Removal efficiency (%):80.3
NO2–N Removal efficiency (%):99.2
SO4-S Removal efficiency (%):nan
NLR kg-N/m3/d:1200^
NRR kg-N/m3/d:1663^
Major findings:Relatively low pH and free ammonia concentration ensured that the UBF achieved a better nitrogen removal performance.
Authors:Tang et al., 2009
Title:Start-up and inhibition analysis of the Anammox process seeded with anaerobic granular sludge
Pubmed link:Link
Full research link:Link
Abstract:The longer start-up period of the Anammox process is due to the very low cellular yield and growth rates of Anammox bacteria. Nitrite inhibition is considered to be the key factor in the instability of the Anammox process during the operation. However, little attention was paid to the inhibitory effect of pH and free ammonia. This paper presents start-up and inhibition analysis of an Anammox biofilm reactor seeded with anaerobic granular sludge. Results showed that the start-up period could be divided into the sludge lysis phase, lag phase, propagation phase, stationary phase and inhibition phase. Optimization control could be implemented correspondingly to accelerate the start-up of Anammox bioreactors. Effluent pH increased to 8.7-9.1 when the nitrogen removal rate was higher than 1,200 mg l(-1) day(-1). The free ammonia concentration was accompanied with a higher level of 64-73 mg l(-1). Inhibitory effects of high pH and free ammonia on Anammox bacteria contributed to the destabilization of the Anammox bioreactor during the first 125 days with influent KHCO(3) of 0.5 g l(-1). Increasing the suffering capacity in the inlet by dosing 1.25 g KHCO(3) l(-1) effectively reduced the pH variation, and the nitrogen removal performance of the reactor was further developed.