Biological Nitrogen Removal Database

A manually curated data resource for microbial nitrogen removal


Comammox


Experimental setup


Influent:Sludge digester liquor treatment

Comammox System:Partial-nitrification, comammox, and anammox 

reactor:Sequencing batch reactor (SBR)

Medium:Suspended-sludge

Culture taken from:Recycled sludge from a secondary clarifier from a sewage treatment plant and laboratory SBR that was used to enrich anammox bacteria

Microorganism cultured:Nitrospira

Respiration:Aerobic

Electron donor:Methanol 

Electron acceptor:Ammonium, nitrite

PH:7.0-8.0

Temperature: 18?°C-28.9?°C

HRT:nan

NH4–N Influent conc(mg/L):2800–3000

NO2–N Influent conc(mg/L):nan

NO3–N Influent conc(mg/L):nan


Experimental Information


NH4–N Effluent (mg N/L):2.27?

NO2–N Effluent (mg N/L):0.21

NO3-N Effluent (mg N/L): 1.51

NH4–N removal rate mg/L/d:0.2543

NO2–N removal rate mg/L/d:nan

NO3-N removal rate mg/L/d:nan

TN Removal rate (mg N/L/d):10?


Information about Article


Authors:Wu et al., 2019

Title:Cooperation between partial-nitrification, complete ammonia oxidation (comammox), and anaerobic ammonia oxidation (anammox) in sludge digestion liquid for nitrogen removal

Pubmed link:None

Full research link:Link

Abstract:The challenge of sludge digester liquor treatment is its high ammonium nitrogen (NH4+-N) concentration. Early reports found that complete ammonia oxidation (comammox) was not present and anaerobic ammonia oxidation (anammox) was difficult to achieve in most sludge digester liquor treatments. In this study, NH4+-N removal by cooperation between partial-nitrification, comammox, and anammox processes was achieved in a sequencing batch reactor (SBR) for sludge digester liquor treatment. The results showed that 2100-2200 mg/L of NH4+-N was removed in the SBR with 98.82% removal efficiency. In addition, 55.11% of NH4+-N was converted to nitrite nitrogen (NO2--N) by partial-nitrification, 25.43% of NH4+-N was converted to nitrate nitrogen (NO3--N) by comammox, and 18.28% of NH4+-N was removed by anammox. During the operation, in the SBR, the relative abundance of the dominant ammonia-oxidizing bacteria (Chitinophagaceae) was 18.89%, that of the dominant anammox bacteria (Candidatus Kuenenia) was 0.10%, and that of the dominant comammox bacteria (Nitrospira) was 0.20%. Therefore, the high nitrogen removal efficiency in this system was considered the result of the combination of the three processes. These results showed that comammox and anammox could play very important roles in nitrogen transformation and energy-saving in nitrogen removal systems.