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:Up Flow - Anaerobic Sludge Blanket Reactor (UASB) reactor
Medium:Granular ANAMMOX sludge
Culture taken from:Laboratory-scale ANAMMOX UASB reactors
Microorganism cultured:nan
Respiration:Anaerobic
Electron donor:Ammonium sulfate ((NH4)2SO4)
Electron acceptor:Sodium Nitrite (NaNO2)
PH:7.5–8.521
Maximum sludge concentration:29.4
HRT:0.162–1.307 h
NH4–N Influent conc(mg/L):325
NO2–N Influent conc(mg/L):300
SO4–S Influent conc(mg/L):nan
NH4–N Removal efficiency (%):91
NO2–N Removal efficiency (%):92
SO4-S Removal efficiency (%):nan
NLR kg-N/m3/d:7.3–71.7
NRR kg-N/m3/d:4.9–47.9
Major findings:A high NRR was achieved in the PR reactor. Using PR effluent sludge to seed the Anammox reactors shortened the start-up period and the maximum NRRs in reactors was generally high.
Authors:Yang and Jin. 2012
Title:Reactivation of effluent granular sludge from a high-rate Anammox reactor after storage
Pubmed link:None
Full research link:Link
Abstract:In this study, effluent sludge from a high-rate Anammox reactor was used to re-start new Anammox reactors for the reactivation of Anammox granular sludge. Different start-up strategies were evaluated in six upflow anaerobic sludge blanket (UASB) reactors (R1–R6) for their effect on nitrogen removal performance. Maximal nitrogen removal rates (NRRs) greater than 20 kg N/m3/day were obtained in reactors R3–R5, which were seeded with mixed Anammox sludge previously stored for approximately 6 months and 1 month. A modified Boltzmann model describing the evolution of the NRR fit the experimental data well. An amount of sludge added to the UASB reactor or decreasing the loading rate proved effective in relieving the substrate inhibition and increasing the NRR. The modified Stover–Kincannon model fit the nitrogen removal data in the Anammox reactors well, and the simulation results showed that the Anammox process has great nitrogen removal potential. The observed inhibition in the Anammox reactors may have been caused by high levels of free ammonia. The sludge used to seed the reactors did not settle well; sludge flotation was observed even after the reactors were operated for a long time at a floating upward velocity (Fs) of greater than 100 m/h. The settling sludge, however, exhibited good settling properties. Scanning electron microscopy showed that the Anammox granules consisted mainly of spherical and elliptical bacteria with abundant filaments on their surface. Hollows in the granules were also present, which may have contributed to sludge floatation.