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:Air-lift reactor (ALR) reactor
Medium:Granular ANAMMOX sludge
Culture taken from:Aerobic sludge from a local municipal wastewater treatment plant
Microorganism cultured:nan
Respiration:Anaerobic
Electron donor:Ammonium sulfate ((NH4)2SO4)
Electron acceptor:Calcium carbonate
PH:nan
Maximum sludge concentration:3.22
HRT:5.4 h
NH4–N Influent conc(mg/L):546
NO2–N Influent conc(mg/L):nan
SO4–S Influent conc(mg/L):nan
NH4–N Removal efficiency (%):94.4
NO2–N Removal efficiency (%):nan
SO4-S Removal efficiency (%):nan
NLR kg-N/m3/d:2.37
NRR kg-N/m3/d:2.29
Major findings:Study demonstrated that nitrifying granules possessed the potential to be used as seed sludge for ANAMMOX and CANON (completely autotrophic nitrogen-removal over nitrite) reactors
Authors:Jin et al., 2008
Title:Performance of a nitrifying airlift reactor using granular sludge
Pubmed link:None
Full research link:Link
Abstract:Since nitrification is the rate-limiting step in the biological nitrogen removal from wastewater, many studies have been conducted on the immobilization of nitrifying bacteria. A laboratory-scale investigation was conducted to examine the effectiveness of a continuous-flow airlift reactor (ALR) on the granulation of nitrifying sludge and the nitrification efficiency of the reactor after granulation. The results showed that the granular sludge began to appear on day 30 and matured in 75 days. The mature granules had an average diameter of 1.54 mm, settling velocity higher than 82.4 m h?1 and specific gravity of 1.07. The granules cultured in the present study had aerobic ammonia oxidation activity of 13.3 mg NH4+-N (g VSS)?1 day?1 and anaerobic ammonium oxidation (ANAMMOX) activity of 3.22 mg NH4+-N (g VSS)?1 day?1, which demonstrated that the nitrifying granules possessed the potential to be used as seed sludge for ANAMMOX and CANON (completely autotrophic nitrogen-removal over nitrite) reactors. After granulation, the ALR exhibited an excellent nitrification performance. It had strong tolerance to influent NH4+-N of 1100 mg L?1. When operated at influent NH4+-N concentration of 546 mg L?1, the reactor could remove over 94.4% of ammonium even at a nitrogen loading rate (NLR) of 2.37 f m?3 day?1 with a short hydraulic retention time (HRT) of 5.4 h. With the influent NH4+-N concentration of 547 mg L?1, HRT 6.9 h and NLR of 1.90 kg m?3 day?1, superior effluent quality could be achieved robustly, with an effluent NH4+-N of less than 5 mg L?1, satisfying the national primary discharging standard of China (GB 8978-1996).